Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1 | /* |
| 2 | * QEMU System Emulator |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
Juan Quintela | 76cc7b5 | 2015-05-08 13:20:21 +0200 | [diff] [blame] | 5 | * Copyright (c) 2011-2015 Red Hat Inc |
| 6 | * |
| 7 | * Authors: |
| 8 | * Juan Quintela <quintela@redhat.com> |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 9 | * |
| 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | * of this software and associated documentation files (the "Software"), to deal |
| 12 | * in the Software without restriction, including without limitation the rights |
| 13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 14 | * copies of the Software, and to permit persons to whom the Software is |
| 15 | * furnished to do so, subject to the following conditions: |
| 16 | * |
| 17 | * The above copyright notice and this permission notice shall be included in |
| 18 | * all copies or substantial portions of the Software. |
| 19 | * |
| 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 26 | * THE SOFTWARE. |
| 27 | */ |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 28 | |
Peter Maydell | 1393a48 | 2016-01-26 18:16:54 +0000 | [diff] [blame] | 29 | #include "qemu/osdep.h" |
Paolo Bonzini | 33c1187 | 2016-03-15 16:58:45 +0100 | [diff] [blame] | 30 | #include "cpu.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 31 | #include <zlib.h> |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 32 | #include "qemu/cutils.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 33 | #include "qemu/bitops.h" |
| 34 | #include "qemu/bitmap.h" |
Juan Quintela | 7205c9e | 2015-05-08 13:54:36 +0200 | [diff] [blame] | 35 | #include "qemu/main-loop.h" |
Juan Quintela | 709e3fe | 2017-04-05 21:47:50 +0200 | [diff] [blame] | 36 | #include "xbzrle.h" |
Juan Quintela | 7b1e1a2 | 2017-04-17 20:26:27 +0200 | [diff] [blame] | 37 | #include "ram.h" |
Juan Quintela | 6666c96 | 2017-04-24 20:07:27 +0200 | [diff] [blame] | 38 | #include "migration.h" |
Juan Quintela | 71bb07d | 2018-02-19 19:01:03 +0100 | [diff] [blame] | 39 | #include "socket.h" |
Juan Quintela | f2a8f0a | 2017-04-24 13:42:55 +0200 | [diff] [blame] | 40 | #include "migration/register.h" |
Juan Quintela | 7b1e1a2 | 2017-04-17 20:26:27 +0200 | [diff] [blame] | 41 | #include "migration/misc.h" |
Juan Quintela | 08a0aee | 2017-04-20 18:52:18 +0200 | [diff] [blame] | 42 | #include "qemu-file.h" |
Juan Quintela | be07b0a | 2017-04-20 13:12:24 +0200 | [diff] [blame] | 43 | #include "postcopy-ram.h" |
Michael S. Tsirkin | 53d37d3 | 2018-05-03 22:50:51 +0300 | [diff] [blame] | 44 | #include "page_cache.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 45 | #include "qemu/error-report.h" |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 46 | #include "qapi/error.h" |
Markus Armbruster | 9af2398 | 2018-02-11 10:36:01 +0100 | [diff] [blame] | 47 | #include "qapi/qapi-events-migration.h" |
Juan Quintela | 8acabf6 | 2017-10-05 22:00:31 +0200 | [diff] [blame] | 48 | #include "qapi/qmp/qerror.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 49 | #include "trace.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 50 | #include "exec/ram_addr.h" |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 51 | #include "exec/target_page.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 52 | #include "qemu/rcu_queue.h" |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 53 | #include "migration/colo.h" |
Michael S. Tsirkin | 53d37d3 | 2018-05-03 22:50:51 +0300 | [diff] [blame] | 54 | #include "block.h" |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 55 | #include "sysemu/sysemu.h" |
| 56 | #include "qemu/uuid.h" |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 57 | #include "savevm.h" |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 58 | #include "qemu/iov.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 59 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 60 | /***********************************************************/ |
| 61 | /* ram save/restore */ |
| 62 | |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 63 | /* RAM_SAVE_FLAG_ZERO used to be named RAM_SAVE_FLAG_COMPRESS, it |
| 64 | * worked for pages that where filled with the same char. We switched |
| 65 | * it to only search for the zero value. And to avoid confusion with |
| 66 | * RAM_SSAVE_FLAG_COMPRESS_PAGE just rename it. |
| 67 | */ |
| 68 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 69 | #define RAM_SAVE_FLAG_FULL 0x01 /* Obsolete, not used anymore */ |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 70 | #define RAM_SAVE_FLAG_ZERO 0x02 |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 71 | #define RAM_SAVE_FLAG_MEM_SIZE 0x04 |
| 72 | #define RAM_SAVE_FLAG_PAGE 0x08 |
| 73 | #define RAM_SAVE_FLAG_EOS 0x10 |
| 74 | #define RAM_SAVE_FLAG_CONTINUE 0x20 |
| 75 | #define RAM_SAVE_FLAG_XBZRLE 0x40 |
| 76 | /* 0x80 is reserved in migration.h start with 0x100 next */ |
| 77 | #define RAM_SAVE_FLAG_COMPRESS_PAGE 0x100 |
| 78 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 79 | static inline bool is_zero_range(uint8_t *p, uint64_t size) |
| 80 | { |
Richard Henderson | a1febc4 | 2016-08-29 11:46:14 -0700 | [diff] [blame] | 81 | return buffer_is_zero(p, size); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 82 | } |
| 83 | |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 84 | XBZRLECacheStats xbzrle_counters; |
| 85 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 86 | /* struct contains XBZRLE cache and a static page |
| 87 | used by the compression */ |
| 88 | static struct { |
| 89 | /* buffer used for XBZRLE encoding */ |
| 90 | uint8_t *encoded_buf; |
| 91 | /* buffer for storing page content */ |
| 92 | uint8_t *current_buf; |
| 93 | /* Cache for XBZRLE, Protected by lock. */ |
| 94 | PageCache *cache; |
| 95 | QemuMutex lock; |
Juan Quintela | c00e092 | 2017-05-09 16:22:01 +0200 | [diff] [blame] | 96 | /* it will store a page full of zeros */ |
| 97 | uint8_t *zero_target_page; |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 98 | /* buffer used for XBZRLE decoding */ |
| 99 | uint8_t *decoded_buf; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 100 | } XBZRLE; |
| 101 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 102 | static void XBZRLE_cache_lock(void) |
| 103 | { |
| 104 | if (migrate_use_xbzrle()) |
| 105 | qemu_mutex_lock(&XBZRLE.lock); |
| 106 | } |
| 107 | |
| 108 | static void XBZRLE_cache_unlock(void) |
| 109 | { |
| 110 | if (migrate_use_xbzrle()) |
| 111 | qemu_mutex_unlock(&XBZRLE.lock); |
| 112 | } |
| 113 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 114 | /** |
| 115 | * xbzrle_cache_resize: resize the xbzrle cache |
| 116 | * |
| 117 | * This function is called from qmp_migrate_set_cache_size in main |
| 118 | * thread, possibly while a migration is in progress. A running |
| 119 | * migration may be using the cache and might finish during this call, |
| 120 | * hence changes to the cache are protected by XBZRLE.lock(). |
| 121 | * |
Juan Quintela | c9dede2 | 2017-10-06 23:03:55 +0200 | [diff] [blame] | 122 | * Returns 0 for success or -1 for error |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 123 | * |
| 124 | * @new_size: new cache size |
Juan Quintela | 8acabf6 | 2017-10-05 22:00:31 +0200 | [diff] [blame] | 125 | * @errp: set *errp if the check failed, with reason |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 126 | */ |
Juan Quintela | c9dede2 | 2017-10-06 23:03:55 +0200 | [diff] [blame] | 127 | int xbzrle_cache_resize(int64_t new_size, Error **errp) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 128 | { |
| 129 | PageCache *new_cache; |
Juan Quintela | c9dede2 | 2017-10-06 23:03:55 +0200 | [diff] [blame] | 130 | int64_t ret = 0; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 131 | |
Juan Quintela | 8acabf6 | 2017-10-05 22:00:31 +0200 | [diff] [blame] | 132 | /* Check for truncation */ |
| 133 | if (new_size != (size_t)new_size) { |
| 134 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", |
| 135 | "exceeding address space"); |
| 136 | return -1; |
| 137 | } |
| 138 | |
Juan Quintela | 2a313e5 | 2017-10-06 23:00:12 +0200 | [diff] [blame] | 139 | if (new_size == migrate_xbzrle_cache_size()) { |
| 140 | /* nothing to do */ |
Juan Quintela | c9dede2 | 2017-10-06 23:03:55 +0200 | [diff] [blame] | 141 | return 0; |
Juan Quintela | 2a313e5 | 2017-10-06 23:00:12 +0200 | [diff] [blame] | 142 | } |
| 143 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 144 | XBZRLE_cache_lock(); |
| 145 | |
| 146 | if (XBZRLE.cache != NULL) { |
Juan Quintela | 80f8dfd | 2017-10-06 22:30:45 +0200 | [diff] [blame] | 147 | new_cache = cache_init(new_size, TARGET_PAGE_SIZE, errp); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 148 | if (!new_cache) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 149 | ret = -1; |
| 150 | goto out; |
| 151 | } |
| 152 | |
| 153 | cache_fini(XBZRLE.cache); |
| 154 | XBZRLE.cache = new_cache; |
| 155 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 156 | out: |
| 157 | XBZRLE_cache_unlock(); |
| 158 | return ret; |
| 159 | } |
| 160 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 161 | static bool ramblock_is_ignored(RAMBlock *block) |
| 162 | { |
| 163 | return !qemu_ram_is_migratable(block) || |
| 164 | (migrate_ignore_shared() && qemu_ram_is_shared(block)); |
| 165 | } |
| 166 | |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 167 | /* Should be holding either ram_list.mutex, or the RCU lock. */ |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 168 | #define RAMBLOCK_FOREACH_NOT_IGNORED(block) \ |
| 169 | INTERNAL_RAMBLOCK_FOREACH(block) \ |
| 170 | if (ramblock_is_ignored(block)) {} else |
| 171 | |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 172 | #define RAMBLOCK_FOREACH_MIGRATABLE(block) \ |
Dr. David Alan Gilbert | 343f632 | 2018-06-05 17:25:45 +0100 | [diff] [blame] | 173 | INTERNAL_RAMBLOCK_FOREACH(block) \ |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 174 | if (!qemu_ram_is_migratable(block)) {} else |
| 175 | |
Dr. David Alan Gilbert | 343f632 | 2018-06-05 17:25:45 +0100 | [diff] [blame] | 176 | #undef RAMBLOCK_FOREACH |
| 177 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 178 | int foreach_not_ignored_block(RAMBlockIterFunc func, void *opaque) |
| 179 | { |
| 180 | RAMBlock *block; |
| 181 | int ret = 0; |
| 182 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 183 | RCU_READ_LOCK_GUARD(); |
| 184 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 185 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
| 186 | ret = func(block, opaque); |
| 187 | if (ret) { |
| 188 | break; |
| 189 | } |
| 190 | } |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 191 | return ret; |
| 192 | } |
| 193 | |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 194 | static void ramblock_recv_map_init(void) |
| 195 | { |
| 196 | RAMBlock *rb; |
| 197 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 198 | RAMBLOCK_FOREACH_NOT_IGNORED(rb) { |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 199 | assert(!rb->receivedmap); |
| 200 | rb->receivedmap = bitmap_new(rb->max_length >> qemu_target_page_bits()); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | int ramblock_recv_bitmap_test(RAMBlock *rb, void *host_addr) |
| 205 | { |
| 206 | return test_bit(ramblock_recv_bitmap_offset(host_addr, rb), |
| 207 | rb->receivedmap); |
| 208 | } |
| 209 | |
Dr. David Alan Gilbert | 1cba9f6 | 2018-03-12 17:21:08 +0000 | [diff] [blame] | 210 | bool ramblock_recv_bitmap_test_byte_offset(RAMBlock *rb, uint64_t byte_offset) |
| 211 | { |
| 212 | return test_bit(byte_offset >> TARGET_PAGE_BITS, rb->receivedmap); |
| 213 | } |
| 214 | |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 215 | void ramblock_recv_bitmap_set(RAMBlock *rb, void *host_addr) |
| 216 | { |
| 217 | set_bit_atomic(ramblock_recv_bitmap_offset(host_addr, rb), rb->receivedmap); |
| 218 | } |
| 219 | |
| 220 | void ramblock_recv_bitmap_set_range(RAMBlock *rb, void *host_addr, |
| 221 | size_t nr) |
| 222 | { |
| 223 | bitmap_set_atomic(rb->receivedmap, |
| 224 | ramblock_recv_bitmap_offset(host_addr, rb), |
| 225 | nr); |
| 226 | } |
| 227 | |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 228 | #define RAMBLOCK_RECV_BITMAP_ENDING (0x0123456789abcdefULL) |
| 229 | |
| 230 | /* |
| 231 | * Format: bitmap_size (8 bytes) + whole_bitmap (N bytes). |
| 232 | * |
| 233 | * Returns >0 if success with sent bytes, or <0 if error. |
| 234 | */ |
| 235 | int64_t ramblock_recv_bitmap_send(QEMUFile *file, |
| 236 | const char *block_name) |
| 237 | { |
| 238 | RAMBlock *block = qemu_ram_block_by_name(block_name); |
| 239 | unsigned long *le_bitmap, nbits; |
| 240 | uint64_t size; |
| 241 | |
| 242 | if (!block) { |
| 243 | error_report("%s: invalid block name: %s", __func__, block_name); |
| 244 | return -1; |
| 245 | } |
| 246 | |
| 247 | nbits = block->used_length >> TARGET_PAGE_BITS; |
| 248 | |
| 249 | /* |
| 250 | * Make sure the tmp bitmap buffer is big enough, e.g., on 32bit |
| 251 | * machines we may need 4 more bytes for padding (see below |
| 252 | * comment). So extend it a bit before hand. |
| 253 | */ |
| 254 | le_bitmap = bitmap_new(nbits + BITS_PER_LONG); |
| 255 | |
| 256 | /* |
| 257 | * Always use little endian when sending the bitmap. This is |
| 258 | * required that when source and destination VMs are not using the |
| 259 | * same endianess. (Note: big endian won't work.) |
| 260 | */ |
| 261 | bitmap_to_le(le_bitmap, block->receivedmap, nbits); |
| 262 | |
| 263 | /* Size of the bitmap, in bytes */ |
Peter Xu | a725ef9 | 2018-07-10 17:18:55 +0800 | [diff] [blame] | 264 | size = DIV_ROUND_UP(nbits, 8); |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 265 | |
| 266 | /* |
| 267 | * size is always aligned to 8 bytes for 64bit machines, but it |
| 268 | * may not be true for 32bit machines. We need this padding to |
| 269 | * make sure the migration can survive even between 32bit and |
| 270 | * 64bit machines. |
| 271 | */ |
| 272 | size = ROUND_UP(size, 8); |
| 273 | |
| 274 | qemu_put_be64(file, size); |
| 275 | qemu_put_buffer(file, (const uint8_t *)le_bitmap, size); |
| 276 | /* |
| 277 | * Mark as an end, in case the middle part is screwed up due to |
| 278 | * some "misterious" reason. |
| 279 | */ |
| 280 | qemu_put_be64(file, RAMBLOCK_RECV_BITMAP_ENDING); |
| 281 | qemu_fflush(file); |
| 282 | |
Peter Xu | bf26990 | 2018-05-25 09:50:42 +0800 | [diff] [blame] | 283 | g_free(le_bitmap); |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 284 | |
| 285 | if (qemu_file_get_error(file)) { |
| 286 | return qemu_file_get_error(file); |
| 287 | } |
| 288 | |
| 289 | return size + sizeof(size); |
| 290 | } |
| 291 | |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 292 | /* |
| 293 | * An outstanding page request, on the source, having been received |
| 294 | * and queued |
| 295 | */ |
| 296 | struct RAMSrcPageRequest { |
| 297 | RAMBlock *rb; |
| 298 | hwaddr offset; |
| 299 | hwaddr len; |
| 300 | |
| 301 | QSIMPLEQ_ENTRY(RAMSrcPageRequest) next_req; |
| 302 | }; |
| 303 | |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 304 | /* State of RAM for migration */ |
| 305 | struct RAMState { |
Juan Quintela | 204b88b | 2017-03-15 09:16:57 +0100 | [diff] [blame] | 306 | /* QEMUFile used for this migration */ |
| 307 | QEMUFile *f; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 308 | /* Last block that we have visited searching for dirty pages */ |
| 309 | RAMBlock *last_seen_block; |
| 310 | /* Last block from where we have sent data */ |
| 311 | RAMBlock *last_sent_block; |
Juan Quintela | 269ace2 | 2017-03-21 15:23:31 +0100 | [diff] [blame] | 312 | /* Last dirty target page we have sent */ |
| 313 | ram_addr_t last_page; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 314 | /* last ram version we have seen */ |
| 315 | uint32_t last_version; |
| 316 | /* We are in the first round */ |
| 317 | bool ram_bulk_stage; |
Wei Wang | 6eeb63f | 2018-12-11 16:24:52 +0800 | [diff] [blame] | 318 | /* The free page optimization is enabled */ |
| 319 | bool fpo_enabled; |
Juan Quintela | 8d820d6 | 2017-03-13 19:35:50 +0100 | [diff] [blame] | 320 | /* How many times we have dirty too many pages */ |
| 321 | int dirty_rate_high_cnt; |
Juan Quintela | f664da8 | 2017-03-13 19:44:57 +0100 | [diff] [blame] | 322 | /* these variables are used for bitmap sync */ |
| 323 | /* last time we did a full bitmap_sync */ |
| 324 | int64_t time_last_bitmap_sync; |
Juan Quintela | eac7415 | 2017-03-28 14:59:01 +0200 | [diff] [blame] | 325 | /* bytes transferred at start_time */ |
Juan Quintela | c4bdf0c | 2017-03-28 14:59:54 +0200 | [diff] [blame] | 326 | uint64_t bytes_xfer_prev; |
Juan Quintela | a66cd90 | 2017-03-28 15:02:43 +0200 | [diff] [blame] | 327 | /* number of dirty pages since start_time */ |
Juan Quintela | 68908ed | 2017-03-28 15:05:53 +0200 | [diff] [blame] | 328 | uint64_t num_dirty_pages_period; |
Juan Quintela | b5833fd | 2017-03-13 19:49:19 +0100 | [diff] [blame] | 329 | /* xbzrle misses since the beginning of the period */ |
| 330 | uint64_t xbzrle_cache_miss_prev; |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 331 | |
| 332 | /* compression statistics since the beginning of the period */ |
| 333 | /* amount of count that no free thread to compress data */ |
| 334 | uint64_t compress_thread_busy_prev; |
| 335 | /* amount bytes after compression */ |
| 336 | uint64_t compressed_size_prev; |
| 337 | /* amount of compressed pages */ |
| 338 | uint64_t compress_pages_prev; |
| 339 | |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 340 | /* total handled target pages at the beginning of period */ |
| 341 | uint64_t target_page_count_prev; |
| 342 | /* total handled target pages since start */ |
| 343 | uint64_t target_page_count; |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 344 | /* number of dirty bits in the bitmap */ |
Peter Xu | 2dfaf12 | 2017-08-02 17:41:19 +0800 | [diff] [blame] | 345 | uint64_t migration_dirty_pages; |
Wei Wang | 386a907 | 2018-12-11 16:24:49 +0800 | [diff] [blame] | 346 | /* Protects modification of the bitmap and migration dirty pages */ |
Juan Quintela | 108cfae | 2017-03-13 21:38:09 +0100 | [diff] [blame] | 347 | QemuMutex bitmap_mutex; |
Juan Quintela | 68a098f | 2017-03-14 13:48:42 +0100 | [diff] [blame] | 348 | /* The RAMBlock used in the last src_page_requests */ |
| 349 | RAMBlock *last_req_rb; |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 350 | /* Queue of outstanding page requests from the destination */ |
| 351 | QemuMutex src_page_req_mutex; |
Paolo Bonzini | b58deb3 | 2018-12-06 11:58:10 +0100 | [diff] [blame] | 352 | QSIMPLEQ_HEAD(, RAMSrcPageRequest) src_page_requests; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 353 | }; |
| 354 | typedef struct RAMState RAMState; |
| 355 | |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 356 | static RAMState *ram_state; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 357 | |
Wei Wang | bd22706 | 2018-12-11 16:24:51 +0800 | [diff] [blame] | 358 | static NotifierWithReturnList precopy_notifier_list; |
| 359 | |
| 360 | void precopy_infrastructure_init(void) |
| 361 | { |
| 362 | notifier_with_return_list_init(&precopy_notifier_list); |
| 363 | } |
| 364 | |
| 365 | void precopy_add_notifier(NotifierWithReturn *n) |
| 366 | { |
| 367 | notifier_with_return_list_add(&precopy_notifier_list, n); |
| 368 | } |
| 369 | |
| 370 | void precopy_remove_notifier(NotifierWithReturn *n) |
| 371 | { |
| 372 | notifier_with_return_remove(n); |
| 373 | } |
| 374 | |
| 375 | int precopy_notify(PrecopyNotifyReason reason, Error **errp) |
| 376 | { |
| 377 | PrecopyNotifyData pnd; |
| 378 | pnd.reason = reason; |
| 379 | pnd.errp = errp; |
| 380 | |
| 381 | return notifier_with_return_list_notify(&precopy_notifier_list, &pnd); |
| 382 | } |
| 383 | |
Wei Wang | 6eeb63f | 2018-12-11 16:24:52 +0800 | [diff] [blame] | 384 | void precopy_enable_free_page_optimization(void) |
| 385 | { |
| 386 | if (!ram_state) { |
| 387 | return; |
| 388 | } |
| 389 | |
| 390 | ram_state->fpo_enabled = true; |
| 391 | } |
| 392 | |
Juan Quintela | 9edabd4 | 2017-03-14 12:02:16 +0100 | [diff] [blame] | 393 | uint64_t ram_bytes_remaining(void) |
| 394 | { |
Dr. David Alan Gilbert | bae416e | 2017-12-15 11:51:23 +0000 | [diff] [blame] | 395 | return ram_state ? (ram_state->migration_dirty_pages * TARGET_PAGE_SIZE) : |
| 396 | 0; |
Juan Quintela | 9edabd4 | 2017-03-14 12:02:16 +0100 | [diff] [blame] | 397 | } |
| 398 | |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 399 | MigrationStats ram_counters; |
Juan Quintela | 9650689 | 2017-03-14 18:41:03 +0100 | [diff] [blame] | 400 | |
Dr. David Alan Gilbert | b8fb8cb | 2015-09-23 15:27:10 +0100 | [diff] [blame] | 401 | /* used by the search for pages to send */ |
| 402 | struct PageSearchStatus { |
| 403 | /* Current block being searched */ |
| 404 | RAMBlock *block; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 405 | /* Current page to search from */ |
| 406 | unsigned long page; |
Dr. David Alan Gilbert | b8fb8cb | 2015-09-23 15:27:10 +0100 | [diff] [blame] | 407 | /* Set once we wrap around */ |
| 408 | bool complete_round; |
| 409 | }; |
| 410 | typedef struct PageSearchStatus PageSearchStatus; |
| 411 | |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 412 | CompressionStats compression_counters; |
| 413 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 414 | struct CompressParam { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 415 | bool done; |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 416 | bool quit; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 417 | bool zero_page; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 418 | QEMUFile *file; |
| 419 | QemuMutex mutex; |
| 420 | QemuCond cond; |
| 421 | RAMBlock *block; |
| 422 | ram_addr_t offset; |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 423 | |
| 424 | /* internally used fields */ |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 425 | z_stream stream; |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 426 | uint8_t *originbuf; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 427 | }; |
| 428 | typedef struct CompressParam CompressParam; |
| 429 | |
| 430 | struct DecompressParam { |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 431 | bool done; |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 432 | bool quit; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 433 | QemuMutex mutex; |
| 434 | QemuCond cond; |
| 435 | void *des; |
Peter Maydell | d341d9f | 2016-01-22 15:09:21 +0000 | [diff] [blame] | 436 | uint8_t *compbuf; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 437 | int len; |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 438 | z_stream stream; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 439 | }; |
| 440 | typedef struct DecompressParam DecompressParam; |
| 441 | |
| 442 | static CompressParam *comp_param; |
| 443 | static QemuThread *compress_threads; |
| 444 | /* comp_done_cond is used to wake up the migration thread when |
| 445 | * one of the compression threads has finished the compression. |
| 446 | * comp_done_lock is used to co-work with comp_done_cond. |
| 447 | */ |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 448 | static QemuMutex comp_done_lock; |
| 449 | static QemuCond comp_done_cond; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 450 | /* The empty QEMUFileOps will be used by file in CompressParam */ |
| 451 | static const QEMUFileOps empty_ops = { }; |
| 452 | |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 453 | static QEMUFile *decomp_file; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 454 | static DecompressParam *decomp_param; |
| 455 | static QemuThread *decompress_threads; |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 456 | static QemuMutex decomp_done_lock; |
| 457 | static QemuCond decomp_done_cond; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 458 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 459 | static bool do_compress_ram_page(QEMUFile *f, z_stream *stream, RAMBlock *block, |
Xiao Guangrong | 6ef3771 | 2018-08-21 16:10:23 +0800 | [diff] [blame] | 460 | ram_addr_t offset, uint8_t *source_buf); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 461 | |
| 462 | static void *do_data_compress(void *opaque) |
| 463 | { |
| 464 | CompressParam *param = opaque; |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 465 | RAMBlock *block; |
| 466 | ram_addr_t offset; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 467 | bool zero_page; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 468 | |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 469 | qemu_mutex_lock(¶m->mutex); |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 470 | while (!param->quit) { |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 471 | if (param->block) { |
| 472 | block = param->block; |
| 473 | offset = param->offset; |
| 474 | param->block = NULL; |
| 475 | qemu_mutex_unlock(¶m->mutex); |
| 476 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 477 | zero_page = do_compress_ram_page(param->file, ¶m->stream, |
| 478 | block, offset, param->originbuf); |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 479 | |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 480 | qemu_mutex_lock(&comp_done_lock); |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 481 | param->done = true; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 482 | param->zero_page = zero_page; |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 483 | qemu_cond_signal(&comp_done_cond); |
| 484 | qemu_mutex_unlock(&comp_done_lock); |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 485 | |
| 486 | qemu_mutex_lock(¶m->mutex); |
| 487 | } else { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 488 | qemu_cond_wait(¶m->cond, ¶m->mutex); |
| 489 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 490 | } |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 491 | qemu_mutex_unlock(¶m->mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 492 | |
| 493 | return NULL; |
| 494 | } |
| 495 | |
Juan Quintela | f0afa33 | 2017-06-28 11:52:28 +0200 | [diff] [blame] | 496 | static void compress_threads_save_cleanup(void) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 497 | { |
| 498 | int i, thread_count; |
| 499 | |
Fei Li | 0530693 | 2018-09-25 17:14:40 +0800 | [diff] [blame] | 500 | if (!migrate_use_compression() || !comp_param) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 501 | return; |
| 502 | } |
Fei Li | 0530693 | 2018-09-25 17:14:40 +0800 | [diff] [blame] | 503 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 504 | thread_count = migrate_compress_threads(); |
| 505 | for (i = 0; i < thread_count; i++) { |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 506 | /* |
| 507 | * we use it as a indicator which shows if the thread is |
| 508 | * properly init'd or not |
| 509 | */ |
| 510 | if (!comp_param[i].file) { |
| 511 | break; |
| 512 | } |
Fei Li | 0530693 | 2018-09-25 17:14:40 +0800 | [diff] [blame] | 513 | |
| 514 | qemu_mutex_lock(&comp_param[i].mutex); |
| 515 | comp_param[i].quit = true; |
| 516 | qemu_cond_signal(&comp_param[i].cond); |
| 517 | qemu_mutex_unlock(&comp_param[i].mutex); |
| 518 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 519 | qemu_thread_join(compress_threads + i); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 520 | qemu_mutex_destroy(&comp_param[i].mutex); |
| 521 | qemu_cond_destroy(&comp_param[i].cond); |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 522 | deflateEnd(&comp_param[i].stream); |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 523 | g_free(comp_param[i].originbuf); |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 524 | qemu_fclose(comp_param[i].file); |
| 525 | comp_param[i].file = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 526 | } |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 527 | qemu_mutex_destroy(&comp_done_lock); |
| 528 | qemu_cond_destroy(&comp_done_cond); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 529 | g_free(compress_threads); |
| 530 | g_free(comp_param); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 531 | compress_threads = NULL; |
| 532 | comp_param = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 533 | } |
| 534 | |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 535 | static int compress_threads_save_setup(void) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 536 | { |
| 537 | int i, thread_count; |
| 538 | |
| 539 | if (!migrate_use_compression()) { |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 540 | return 0; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 541 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 542 | thread_count = migrate_compress_threads(); |
| 543 | compress_threads = g_new0(QemuThread, thread_count); |
| 544 | comp_param = g_new0(CompressParam, thread_count); |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 545 | qemu_cond_init(&comp_done_cond); |
| 546 | qemu_mutex_init(&comp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 547 | for (i = 0; i < thread_count; i++) { |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 548 | comp_param[i].originbuf = g_try_malloc(TARGET_PAGE_SIZE); |
| 549 | if (!comp_param[i].originbuf) { |
| 550 | goto exit; |
| 551 | } |
| 552 | |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 553 | if (deflateInit(&comp_param[i].stream, |
| 554 | migrate_compress_level()) != Z_OK) { |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 555 | g_free(comp_param[i].originbuf); |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 556 | goto exit; |
| 557 | } |
| 558 | |
Cao jin | e110aa9 | 2016-07-29 15:10:31 +0800 | [diff] [blame] | 559 | /* comp_param[i].file is just used as a dummy buffer to save data, |
| 560 | * set its ops to empty. |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 561 | */ |
| 562 | comp_param[i].file = qemu_fopen_ops(NULL, &empty_ops); |
| 563 | comp_param[i].done = true; |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 564 | comp_param[i].quit = false; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 565 | qemu_mutex_init(&comp_param[i].mutex); |
| 566 | qemu_cond_init(&comp_param[i].cond); |
| 567 | qemu_thread_create(compress_threads + i, "compress", |
| 568 | do_data_compress, comp_param + i, |
| 569 | QEMU_THREAD_JOINABLE); |
| 570 | } |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 571 | return 0; |
| 572 | |
| 573 | exit: |
| 574 | compress_threads_save_cleanup(); |
| 575 | return -1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 576 | } |
| 577 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 578 | /* Multiple fd's */ |
| 579 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 580 | #define MULTIFD_MAGIC 0x11223344U |
| 581 | #define MULTIFD_VERSION 1 |
| 582 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 583 | #define MULTIFD_FLAG_SYNC (1 << 0) |
| 584 | |
Juan Quintela | efd1a1d | 2019-02-20 12:06:03 +0100 | [diff] [blame] | 585 | /* This value needs to be a multiple of qemu_target_page_size() */ |
Juan Quintela | 4b0c726 | 2019-02-20 12:45:57 +0100 | [diff] [blame] | 586 | #define MULTIFD_PACKET_SIZE (512 * 1024) |
Juan Quintela | efd1a1d | 2019-02-20 12:06:03 +0100 | [diff] [blame] | 587 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 588 | typedef struct { |
| 589 | uint32_t magic; |
| 590 | uint32_t version; |
| 591 | unsigned char uuid[16]; /* QemuUUID */ |
| 592 | uint8_t id; |
Juan Quintela | 5fbd8b4 | 2019-03-13 10:54:58 +0100 | [diff] [blame] | 593 | uint8_t unused1[7]; /* Reserved for future use */ |
| 594 | uint64_t unused2[4]; /* Reserved for future use */ |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 595 | } __attribute__((packed)) MultiFDInit_t; |
| 596 | |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 597 | typedef struct { |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 598 | uint32_t magic; |
| 599 | uint32_t version; |
| 600 | uint32_t flags; |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame] | 601 | /* maximum number of allocated pages */ |
| 602 | uint32_t pages_alloc; |
| 603 | uint32_t pages_used; |
Juan Quintela | 2a34ee5 | 2019-01-04 19:45:39 +0100 | [diff] [blame] | 604 | /* size of the next packet that contains pages */ |
| 605 | uint32_t next_packet_size; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 606 | uint64_t packet_num; |
Juan Quintela | 5fbd8b4 | 2019-03-13 10:54:58 +0100 | [diff] [blame] | 607 | uint64_t unused[4]; /* Reserved for future use */ |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 608 | char ramblock[256]; |
| 609 | uint64_t offset[]; |
| 610 | } __attribute__((packed)) MultiFDPacket_t; |
| 611 | |
| 612 | typedef struct { |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 613 | /* number of used pages */ |
| 614 | uint32_t used; |
| 615 | /* number of allocated pages */ |
| 616 | uint32_t allocated; |
| 617 | /* global number of generated multifd packets */ |
| 618 | uint64_t packet_num; |
| 619 | /* offset of each page */ |
| 620 | ram_addr_t *offset; |
| 621 | /* pointer to each page */ |
| 622 | struct iovec *iov; |
| 623 | RAMBlock *block; |
| 624 | } MultiFDPages_t; |
| 625 | |
| 626 | typedef struct { |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 627 | /* this fields are not changed once the thread is created */ |
| 628 | /* channel number */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 629 | uint8_t id; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 630 | /* channel thread name */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 631 | char *name; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 632 | /* channel thread id */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 633 | QemuThread thread; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 634 | /* communication channel */ |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 635 | QIOChannel *c; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 636 | /* sem where to wait for more work */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 637 | QemuSemaphore sem; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 638 | /* this mutex protects the following parameters */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 639 | QemuMutex mutex; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 640 | /* is this channel thread running */ |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 641 | bool running; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 642 | /* should this thread finish */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 643 | bool quit; |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 644 | /* thread has work to do */ |
| 645 | int pending_job; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 646 | /* array of pages to sent */ |
| 647 | MultiFDPages_t *pages; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 648 | /* packet allocated len */ |
| 649 | uint32_t packet_len; |
| 650 | /* pointer to the packet */ |
| 651 | MultiFDPacket_t *packet; |
| 652 | /* multifd flags for each packet */ |
| 653 | uint32_t flags; |
Juan Quintela | 2a34ee5 | 2019-01-04 19:45:39 +0100 | [diff] [blame] | 654 | /* size of the next packet that contains pages */ |
| 655 | uint32_t next_packet_size; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 656 | /* global number of generated multifd packets */ |
| 657 | uint64_t packet_num; |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 658 | /* thread local variables */ |
| 659 | /* packets sent through this channel */ |
| 660 | uint64_t num_packets; |
| 661 | /* pages sent through this channel */ |
| 662 | uint64_t num_pages; |
Juan Quintela | 18cdcea | 2019-08-14 04:02:14 +0200 | [diff] [blame] | 663 | /* syncs main thread and channels */ |
| 664 | QemuSemaphore sem_sync; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 665 | } MultiFDSendParams; |
| 666 | |
| 667 | typedef struct { |
| 668 | /* this fields are not changed once the thread is created */ |
| 669 | /* channel number */ |
| 670 | uint8_t id; |
| 671 | /* channel thread name */ |
| 672 | char *name; |
| 673 | /* channel thread id */ |
| 674 | QemuThread thread; |
| 675 | /* communication channel */ |
| 676 | QIOChannel *c; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 677 | /* this mutex protects the following parameters */ |
| 678 | QemuMutex mutex; |
| 679 | /* is this channel thread running */ |
| 680 | bool running; |
Juan Quintela | 3c3ca25 | 2019-07-24 11:46:24 +0200 | [diff] [blame] | 681 | /* should this thread finish */ |
| 682 | bool quit; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 683 | /* array of pages to receive */ |
| 684 | MultiFDPages_t *pages; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 685 | /* packet allocated len */ |
| 686 | uint32_t packet_len; |
| 687 | /* pointer to the packet */ |
| 688 | MultiFDPacket_t *packet; |
| 689 | /* multifd flags for each packet */ |
| 690 | uint32_t flags; |
| 691 | /* global number of generated multifd packets */ |
| 692 | uint64_t packet_num; |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 693 | /* thread local variables */ |
Juan Quintela | 2a34ee5 | 2019-01-04 19:45:39 +0100 | [diff] [blame] | 694 | /* size of the next packet that contains pages */ |
| 695 | uint32_t next_packet_size; |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 696 | /* packets sent through this channel */ |
| 697 | uint64_t num_packets; |
| 698 | /* pages sent through this channel */ |
| 699 | uint64_t num_pages; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 700 | /* syncs main thread and channels */ |
| 701 | QemuSemaphore sem_sync; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 702 | } MultiFDRecvParams; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 703 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 704 | static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp) |
| 705 | { |
Juan Quintela | d069bcc | 2020-01-13 18:41:02 +0100 | [diff] [blame] | 706 | MultiFDInit_t msg = {}; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 707 | int ret; |
| 708 | |
| 709 | msg.magic = cpu_to_be32(MULTIFD_MAGIC); |
| 710 | msg.version = cpu_to_be32(MULTIFD_VERSION); |
| 711 | msg.id = p->id; |
| 712 | memcpy(msg.uuid, &qemu_uuid.data, sizeof(msg.uuid)); |
| 713 | |
| 714 | ret = qio_channel_write_all(p->c, (char *)&msg, sizeof(msg), errp); |
| 715 | if (ret != 0) { |
| 716 | return -1; |
| 717 | } |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | static int multifd_recv_initial_packet(QIOChannel *c, Error **errp) |
| 722 | { |
| 723 | MultiFDInit_t msg; |
| 724 | int ret; |
| 725 | |
| 726 | ret = qio_channel_read_all(c, (char *)&msg, sizeof(msg), errp); |
| 727 | if (ret != 0) { |
| 728 | return -1; |
| 729 | } |
| 730 | |
Peter Maydell | 341ba0d | 2018-09-25 17:19:24 +0100 | [diff] [blame] | 731 | msg.magic = be32_to_cpu(msg.magic); |
| 732 | msg.version = be32_to_cpu(msg.version); |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 733 | |
| 734 | if (msg.magic != MULTIFD_MAGIC) { |
| 735 | error_setg(errp, "multifd: received packet magic %x " |
| 736 | "expected %x", msg.magic, MULTIFD_MAGIC); |
| 737 | return -1; |
| 738 | } |
| 739 | |
| 740 | if (msg.version != MULTIFD_VERSION) { |
| 741 | error_setg(errp, "multifd: received packet version %d " |
| 742 | "expected %d", msg.version, MULTIFD_VERSION); |
| 743 | return -1; |
| 744 | } |
| 745 | |
| 746 | if (memcmp(msg.uuid, &qemu_uuid, sizeof(qemu_uuid))) { |
| 747 | char *uuid = qemu_uuid_unparse_strdup(&qemu_uuid); |
| 748 | char *msg_uuid = qemu_uuid_unparse_strdup((const QemuUUID *)msg.uuid); |
| 749 | |
| 750 | error_setg(errp, "multifd: received uuid '%s' and expected " |
| 751 | "uuid '%s' for channel %hhd", msg_uuid, uuid, msg.id); |
| 752 | g_free(uuid); |
| 753 | g_free(msg_uuid); |
| 754 | return -1; |
| 755 | } |
| 756 | |
| 757 | if (msg.id > migrate_multifd_channels()) { |
| 758 | error_setg(errp, "multifd: received channel version %d " |
| 759 | "expected %d", msg.version, MULTIFD_VERSION); |
| 760 | return -1; |
| 761 | } |
| 762 | |
| 763 | return msg.id; |
| 764 | } |
| 765 | |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 766 | static MultiFDPages_t *multifd_pages_init(size_t size) |
| 767 | { |
| 768 | MultiFDPages_t *pages = g_new0(MultiFDPages_t, 1); |
| 769 | |
| 770 | pages->allocated = size; |
| 771 | pages->iov = g_new0(struct iovec, size); |
| 772 | pages->offset = g_new0(ram_addr_t, size); |
| 773 | |
| 774 | return pages; |
| 775 | } |
| 776 | |
| 777 | static void multifd_pages_clear(MultiFDPages_t *pages) |
| 778 | { |
| 779 | pages->used = 0; |
| 780 | pages->allocated = 0; |
| 781 | pages->packet_num = 0; |
| 782 | pages->block = NULL; |
| 783 | g_free(pages->iov); |
| 784 | pages->iov = NULL; |
| 785 | g_free(pages->offset); |
| 786 | pages->offset = NULL; |
| 787 | g_free(pages); |
| 788 | } |
| 789 | |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 790 | static void multifd_send_fill_packet(MultiFDSendParams *p) |
| 791 | { |
| 792 | MultiFDPacket_t *packet = p->packet; |
| 793 | int i; |
| 794 | |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 795 | packet->flags = cpu_to_be32(p->flags); |
Wei Yang | f2148c4 | 2019-10-11 16:50:48 +0800 | [diff] [blame] | 796 | packet->pages_alloc = cpu_to_be32(p->pages->allocated); |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame] | 797 | packet->pages_used = cpu_to_be32(p->pages->used); |
Juan Quintela | 2a34ee5 | 2019-01-04 19:45:39 +0100 | [diff] [blame] | 798 | packet->next_packet_size = cpu_to_be32(p->next_packet_size); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 799 | packet->packet_num = cpu_to_be64(p->packet_num); |
| 800 | |
| 801 | if (p->pages->block) { |
| 802 | strncpy(packet->ramblock, p->pages->block->idstr, 256); |
| 803 | } |
| 804 | |
| 805 | for (i = 0; i < p->pages->used; i++) { |
| 806 | packet->offset[i] = cpu_to_be64(p->pages->offset[i]); |
| 807 | } |
| 808 | } |
| 809 | |
| 810 | static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) |
| 811 | { |
| 812 | MultiFDPacket_t *packet = p->packet; |
Juan Quintela | 7ed379b | 2019-02-20 12:44:07 +0100 | [diff] [blame] | 813 | uint32_t pages_max = MULTIFD_PACKET_SIZE / qemu_target_page_size(); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 814 | RAMBlock *block; |
| 815 | int i; |
| 816 | |
Peter Maydell | 341ba0d | 2018-09-25 17:19:24 +0100 | [diff] [blame] | 817 | packet->magic = be32_to_cpu(packet->magic); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 818 | if (packet->magic != MULTIFD_MAGIC) { |
| 819 | error_setg(errp, "multifd: received packet " |
| 820 | "magic %x and expected magic %x", |
| 821 | packet->magic, MULTIFD_MAGIC); |
| 822 | return -1; |
| 823 | } |
| 824 | |
Peter Maydell | 341ba0d | 2018-09-25 17:19:24 +0100 | [diff] [blame] | 825 | packet->version = be32_to_cpu(packet->version); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 826 | if (packet->version != MULTIFD_VERSION) { |
| 827 | error_setg(errp, "multifd: received packet " |
| 828 | "version %d and expected version %d", |
| 829 | packet->version, MULTIFD_VERSION); |
| 830 | return -1; |
| 831 | } |
| 832 | |
| 833 | p->flags = be32_to_cpu(packet->flags); |
| 834 | |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame] | 835 | packet->pages_alloc = be32_to_cpu(packet->pages_alloc); |
Juan Quintela | 7ed379b | 2019-02-20 12:44:07 +0100 | [diff] [blame] | 836 | /* |
Wei Yang | d884e77 | 2019-10-11 16:50:47 +0800 | [diff] [blame] | 837 | * If we received a packet that is 100 times bigger than expected |
Juan Quintela | 7ed379b | 2019-02-20 12:44:07 +0100 | [diff] [blame] | 838 | * just stop migration. It is a magic number. |
| 839 | */ |
| 840 | if (packet->pages_alloc > pages_max * 100) { |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 841 | error_setg(errp, "multifd: received packet " |
Juan Quintela | 7ed379b | 2019-02-20 12:44:07 +0100 | [diff] [blame] | 842 | "with size %d and expected a maximum size of %d", |
| 843 | packet->pages_alloc, pages_max * 100) ; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 844 | return -1; |
| 845 | } |
Juan Quintela | 7ed379b | 2019-02-20 12:44:07 +0100 | [diff] [blame] | 846 | /* |
| 847 | * We received a packet that is bigger than expected but inside |
| 848 | * reasonable limits (see previous comment). Just reallocate. |
| 849 | */ |
| 850 | if (packet->pages_alloc > p->pages->allocated) { |
| 851 | multifd_pages_clear(p->pages); |
Peter Maydell | f151f8a | 2019-04-09 16:18:30 +0100 | [diff] [blame] | 852 | p->pages = multifd_pages_init(packet->pages_alloc); |
Juan Quintela | 7ed379b | 2019-02-20 12:44:07 +0100 | [diff] [blame] | 853 | } |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 854 | |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame] | 855 | p->pages->used = be32_to_cpu(packet->pages_used); |
| 856 | if (p->pages->used > packet->pages_alloc) { |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 857 | error_setg(errp, "multifd: received packet " |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame] | 858 | "with %d pages and expected maximum pages are %d", |
| 859 | p->pages->used, packet->pages_alloc) ; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 860 | return -1; |
| 861 | } |
| 862 | |
Juan Quintela | 2a34ee5 | 2019-01-04 19:45:39 +0100 | [diff] [blame] | 863 | p->next_packet_size = be32_to_cpu(packet->next_packet_size); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 864 | p->packet_num = be64_to_cpu(packet->packet_num); |
| 865 | |
Marc-André Lureau | e4f1bea | 2019-10-04 15:12:09 +0400 | [diff] [blame] | 866 | if (p->pages->used == 0) { |
| 867 | return 0; |
| 868 | } |
| 869 | |
| 870 | /* make sure that ramblock is 0 terminated */ |
| 871 | packet->ramblock[255] = 0; |
| 872 | block = qemu_ram_block_by_name(packet->ramblock); |
| 873 | if (!block) { |
| 874 | error_setg(errp, "multifd: unknown ram block %s", |
| 875 | packet->ramblock); |
| 876 | return -1; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 877 | } |
| 878 | |
| 879 | for (i = 0; i < p->pages->used; i++) { |
| 880 | ram_addr_t offset = be64_to_cpu(packet->offset[i]); |
| 881 | |
| 882 | if (offset > (block->used_length - TARGET_PAGE_SIZE)) { |
| 883 | error_setg(errp, "multifd: offset too long " RAM_ADDR_FMT |
| 884 | " (max " RAM_ADDR_FMT ")", |
| 885 | offset, block->max_length); |
| 886 | return -1; |
| 887 | } |
| 888 | p->pages->iov[i].iov_base = block->host + offset; |
| 889 | p->pages->iov[i].iov_len = TARGET_PAGE_SIZE; |
| 890 | } |
| 891 | |
| 892 | return 0; |
| 893 | } |
| 894 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 895 | struct { |
| 896 | MultiFDSendParams *params; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 897 | /* array of pages to sent */ |
| 898 | MultiFDPages_t *pages; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 899 | /* global number of generated multifd packets */ |
| 900 | uint64_t packet_num; |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 901 | /* send channels ready */ |
| 902 | QemuSemaphore channels_ready; |
Juan Quintela | 4d65a62 | 2019-12-18 05:36:22 +0100 | [diff] [blame] | 903 | /* |
| 904 | * Have we already run terminate threads. There is a race when it |
| 905 | * happens that we got one error while we are exiting. |
| 906 | * We will use atomic operations. Only valid values are 0 and 1. |
| 907 | */ |
| 908 | int exiting; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 909 | } *multifd_send_state; |
| 910 | |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 911 | /* |
| 912 | * How we use multifd_send_state->pages and channel->pages? |
| 913 | * |
| 914 | * We create a pages for each channel, and a main one. Each time that |
| 915 | * we need to send a batch of pages we interchange the ones between |
| 916 | * multifd_send_state and the channel that is sending it. There are |
| 917 | * two reasons for that: |
| 918 | * - to not have to do so many mallocs during migration |
| 919 | * - to make easier to know what to free at the end of migration |
| 920 | * |
| 921 | * This way we always know who is the owner of each "pages" struct, |
Wei Yang | a5f7b1a | 2019-05-11 07:37:29 +0800 | [diff] [blame] | 922 | * and we don't need any locking. It belongs to the migration thread |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 923 | * or to the channel thread. Switching is safe because the migration |
| 924 | * thread is using the channel mutex when changing it, and the channel |
| 925 | * have to had finish with its own, otherwise pending_job can't be |
| 926 | * false. |
| 927 | */ |
| 928 | |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 929 | static int multifd_send_pages(RAMState *rs) |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 930 | { |
| 931 | int i; |
| 932 | static int next_channel; |
| 933 | MultiFDSendParams *p = NULL; /* make happy gcc */ |
| 934 | MultiFDPages_t *pages = multifd_send_state->pages; |
| 935 | uint64_t transferred; |
| 936 | |
Juan Quintela | 4d65a62 | 2019-12-18 05:36:22 +0100 | [diff] [blame] | 937 | if (atomic_read(&multifd_send_state->exiting)) { |
| 938 | return -1; |
| 939 | } |
| 940 | |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 941 | qemu_sem_wait(&multifd_send_state->channels_ready); |
| 942 | for (i = next_channel;; i = (i + 1) % migrate_multifd_channels()) { |
| 943 | p = &multifd_send_state->params[i]; |
| 944 | |
| 945 | qemu_mutex_lock(&p->mutex); |
Ivan Ren | 713f762 | 2019-06-25 21:18:17 +0800 | [diff] [blame] | 946 | if (p->quit) { |
| 947 | error_report("%s: channel %d has already quit!", __func__, i); |
| 948 | qemu_mutex_unlock(&p->mutex); |
| 949 | return -1; |
| 950 | } |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 951 | if (!p->pending_job) { |
| 952 | p->pending_job++; |
| 953 | next_channel = (i + 1) % migrate_multifd_channels(); |
| 954 | break; |
| 955 | } |
| 956 | qemu_mutex_unlock(&p->mutex); |
| 957 | } |
| 958 | p->pages->used = 0; |
| 959 | |
| 960 | p->packet_num = multifd_send_state->packet_num++; |
| 961 | p->pages->block = NULL; |
| 962 | multifd_send_state->pages = p->pages; |
| 963 | p->pages = pages; |
Peter Xu | 4fcefd4 | 2018-07-20 11:47:13 +0800 | [diff] [blame] | 964 | transferred = ((uint64_t) pages->used) * TARGET_PAGE_SIZE + p->packet_len; |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 965 | qemu_file_update_transfer(rs->f, transferred); |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 966 | ram_counters.multifd_bytes += transferred; |
| 967 | ram_counters.transferred += transferred;; |
| 968 | qemu_mutex_unlock(&p->mutex); |
| 969 | qemu_sem_post(&p->sem); |
Ivan Ren | 713f762 | 2019-06-25 21:18:17 +0800 | [diff] [blame] | 970 | |
| 971 | return 1; |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 972 | } |
| 973 | |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 974 | static int multifd_queue_page(RAMState *rs, RAMBlock *block, ram_addr_t offset) |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 975 | { |
| 976 | MultiFDPages_t *pages = multifd_send_state->pages; |
| 977 | |
| 978 | if (!pages->block) { |
| 979 | pages->block = block; |
| 980 | } |
| 981 | |
| 982 | if (pages->block == block) { |
| 983 | pages->offset[pages->used] = offset; |
| 984 | pages->iov[pages->used].iov_base = block->host + offset; |
| 985 | pages->iov[pages->used].iov_len = TARGET_PAGE_SIZE; |
| 986 | pages->used++; |
| 987 | |
| 988 | if (pages->used < pages->allocated) { |
Ivan Ren | 713f762 | 2019-06-25 21:18:17 +0800 | [diff] [blame] | 989 | return 1; |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 990 | } |
| 991 | } |
| 992 | |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 993 | if (multifd_send_pages(rs) < 0) { |
Ivan Ren | 713f762 | 2019-06-25 21:18:17 +0800 | [diff] [blame] | 994 | return -1; |
| 995 | } |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 996 | |
| 997 | if (pages->block != block) { |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 998 | return multifd_queue_page(rs, block, offset); |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 999 | } |
Ivan Ren | 713f762 | 2019-06-25 21:18:17 +0800 | [diff] [blame] | 1000 | |
| 1001 | return 1; |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1002 | } |
| 1003 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1004 | static void multifd_send_terminate_threads(Error *err) |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1005 | { |
| 1006 | int i; |
| 1007 | |
Juan Quintela | 5558c91 | 2019-08-14 04:02:13 +0200 | [diff] [blame] | 1008 | trace_multifd_send_terminate_threads(err != NULL); |
| 1009 | |
Juan Quintela | 7a169d7 | 2018-02-19 19:01:15 +0100 | [diff] [blame] | 1010 | if (err) { |
| 1011 | MigrationState *s = migrate_get_current(); |
| 1012 | migrate_set_error(s, err); |
| 1013 | if (s->state == MIGRATION_STATUS_SETUP || |
| 1014 | s->state == MIGRATION_STATUS_PRE_SWITCHOVER || |
| 1015 | s->state == MIGRATION_STATUS_DEVICE || |
| 1016 | s->state == MIGRATION_STATUS_ACTIVE) { |
| 1017 | migrate_set_state(&s->state, s->state, |
| 1018 | MIGRATION_STATUS_FAILED); |
| 1019 | } |
| 1020 | } |
| 1021 | |
Juan Quintela | 4d65a62 | 2019-12-18 05:36:22 +0100 | [diff] [blame] | 1022 | /* |
| 1023 | * We don't want to exit each threads twice. Depending on where |
| 1024 | * we get the error, or if there are two independent errors in two |
| 1025 | * threads at the same time, we can end calling this function |
| 1026 | * twice. |
| 1027 | */ |
| 1028 | if (atomic_xchg(&multifd_send_state->exiting, 1)) { |
| 1029 | return; |
| 1030 | } |
| 1031 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1032 | for (i = 0; i < migrate_multifd_channels(); i++) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1033 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 1034 | |
| 1035 | qemu_mutex_lock(&p->mutex); |
| 1036 | p->quit = true; |
| 1037 | qemu_sem_post(&p->sem); |
| 1038 | qemu_mutex_unlock(&p->mutex); |
| 1039 | } |
| 1040 | } |
| 1041 | |
Fei Li | 1398b2e | 2019-01-13 22:08:47 +0800 | [diff] [blame] | 1042 | void multifd_save_cleanup(void) |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1043 | { |
| 1044 | int i; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1045 | |
| 1046 | if (!migrate_use_multifd()) { |
Fei Li | 1398b2e | 2019-01-13 22:08:47 +0800 | [diff] [blame] | 1047 | return; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1048 | } |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1049 | multifd_send_terminate_threads(NULL); |
| 1050 | for (i = 0; i < migrate_multifd_channels(); i++) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1051 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 1052 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1053 | if (p->running) { |
| 1054 | qemu_thread_join(&p->thread); |
| 1055 | } |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1056 | socket_send_channel_destroy(p->c); |
| 1057 | p->c = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1058 | qemu_mutex_destroy(&p->mutex); |
| 1059 | qemu_sem_destroy(&p->sem); |
Juan Quintela | 18cdcea | 2019-08-14 04:02:14 +0200 | [diff] [blame] | 1060 | qemu_sem_destroy(&p->sem_sync); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1061 | g_free(p->name); |
| 1062 | p->name = NULL; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1063 | multifd_pages_clear(p->pages); |
| 1064 | p->pages = NULL; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 1065 | p->packet_len = 0; |
| 1066 | g_free(p->packet); |
| 1067 | p->packet = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1068 | } |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1069 | qemu_sem_destroy(&multifd_send_state->channels_ready); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1070 | g_free(multifd_send_state->params); |
| 1071 | multifd_send_state->params = NULL; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1072 | multifd_pages_clear(multifd_send_state->pages); |
| 1073 | multifd_send_state->pages = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1074 | g_free(multifd_send_state); |
| 1075 | multifd_send_state = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1076 | } |
| 1077 | |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 1078 | static void multifd_send_sync_main(RAMState *rs) |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1079 | { |
| 1080 | int i; |
| 1081 | |
| 1082 | if (!migrate_use_multifd()) { |
| 1083 | return; |
| 1084 | } |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1085 | if (multifd_send_state->pages->used) { |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 1086 | if (multifd_send_pages(rs) < 0) { |
Ivan Ren | 713f762 | 2019-06-25 21:18:17 +0800 | [diff] [blame] | 1087 | error_report("%s: multifd_send_pages fail", __func__); |
| 1088 | return; |
| 1089 | } |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1090 | } |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1091 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 1092 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 1093 | |
| 1094 | trace_multifd_send_sync_main_signal(p->id); |
| 1095 | |
| 1096 | qemu_mutex_lock(&p->mutex); |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1097 | |
Ivan Ren | 713f762 | 2019-06-25 21:18:17 +0800 | [diff] [blame] | 1098 | if (p->quit) { |
| 1099 | error_report("%s: channel %d has already quit", __func__, i); |
| 1100 | qemu_mutex_unlock(&p->mutex); |
| 1101 | return; |
| 1102 | } |
| 1103 | |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1104 | p->packet_num = multifd_send_state->packet_num++; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1105 | p->flags |= MULTIFD_FLAG_SYNC; |
| 1106 | p->pending_job++; |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 1107 | qemu_file_update_transfer(rs->f, p->packet_len); |
Ivan Ren | 81507f6 | 2019-07-30 13:33:36 +0800 | [diff] [blame] | 1108 | ram_counters.multifd_bytes += p->packet_len; |
| 1109 | ram_counters.transferred += p->packet_len; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1110 | qemu_mutex_unlock(&p->mutex); |
| 1111 | qemu_sem_post(&p->sem); |
| 1112 | } |
| 1113 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 1114 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 1115 | |
| 1116 | trace_multifd_send_sync_main_wait(p->id); |
Juan Quintela | 18cdcea | 2019-08-14 04:02:14 +0200 | [diff] [blame] | 1117 | qemu_sem_wait(&p->sem_sync); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1118 | } |
| 1119 | trace_multifd_send_sync_main(multifd_send_state->packet_num); |
| 1120 | } |
| 1121 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1122 | static void *multifd_send_thread(void *opaque) |
| 1123 | { |
| 1124 | MultiFDSendParams *p = opaque; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1125 | Error *local_err = NULL; |
Ivan Ren | a3ec6b7 | 2019-06-25 21:18:18 +0800 | [diff] [blame] | 1126 | int ret = 0; |
| 1127 | uint32_t flags = 0; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1128 | |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1129 | trace_multifd_send_thread_start(p->id); |
Lidong Chen | 74637e6 | 2018-08-06 21:29:29 +0800 | [diff] [blame] | 1130 | rcu_register_thread(); |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1131 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1132 | if (multifd_send_initial_packet(p, &local_err) < 0) { |
Ivan Ren | 2f4aefd | 2019-08-29 10:16:36 +0800 | [diff] [blame] | 1133 | ret = -1; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1134 | goto out; |
| 1135 | } |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1136 | /* initial packet */ |
| 1137 | p->num_packets = 1; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1138 | |
| 1139 | while (true) { |
Juan Quintela | d82628e | 2018-04-11 02:44:24 +0200 | [diff] [blame] | 1140 | qemu_sem_wait(&p->sem); |
Juan Quintela | 4d65a62 | 2019-12-18 05:36:22 +0100 | [diff] [blame] | 1141 | |
| 1142 | if (atomic_read(&multifd_send_state->exiting)) { |
| 1143 | break; |
| 1144 | } |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1145 | qemu_mutex_lock(&p->mutex); |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1146 | |
| 1147 | if (p->pending_job) { |
| 1148 | uint32_t used = p->pages->used; |
| 1149 | uint64_t packet_num = p->packet_num; |
Ivan Ren | a3ec6b7 | 2019-06-25 21:18:18 +0800 | [diff] [blame] | 1150 | flags = p->flags; |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1151 | |
Juan Quintela | 2a34ee5 | 2019-01-04 19:45:39 +0100 | [diff] [blame] | 1152 | p->next_packet_size = used * qemu_target_page_size(); |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1153 | multifd_send_fill_packet(p); |
| 1154 | p->flags = 0; |
| 1155 | p->num_packets++; |
| 1156 | p->num_pages += used; |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1157 | qemu_mutex_unlock(&p->mutex); |
| 1158 | |
Juan Quintela | 2a34ee5 | 2019-01-04 19:45:39 +0100 | [diff] [blame] | 1159 | trace_multifd_send(p->id, packet_num, used, flags, |
| 1160 | p->next_packet_size); |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1161 | |
Juan Quintela | 8b2db7f | 2018-04-11 12:36:13 +0200 | [diff] [blame] | 1162 | ret = qio_channel_write_all(p->c, (void *)p->packet, |
| 1163 | p->packet_len, &local_err); |
| 1164 | if (ret != 0) { |
| 1165 | break; |
| 1166 | } |
| 1167 | |
Juan Quintela | ad24c7c | 2019-01-04 19:12:35 +0100 | [diff] [blame] | 1168 | if (used) { |
| 1169 | ret = qio_channel_writev_all(p->c, p->pages->iov, |
| 1170 | used, &local_err); |
| 1171 | if (ret != 0) { |
| 1172 | break; |
| 1173 | } |
Juan Quintela | 8b2db7f | 2018-04-11 12:36:13 +0200 | [diff] [blame] | 1174 | } |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1175 | |
| 1176 | qemu_mutex_lock(&p->mutex); |
| 1177 | p->pending_job--; |
| 1178 | qemu_mutex_unlock(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1179 | |
| 1180 | if (flags & MULTIFD_FLAG_SYNC) { |
Juan Quintela | 18cdcea | 2019-08-14 04:02:14 +0200 | [diff] [blame] | 1181 | qemu_sem_post(&p->sem_sync); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1182 | } |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1183 | qemu_sem_post(&multifd_send_state->channels_ready); |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1184 | } else if (p->quit) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1185 | qemu_mutex_unlock(&p->mutex); |
| 1186 | break; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1187 | } else { |
| 1188 | qemu_mutex_unlock(&p->mutex); |
| 1189 | /* sometimes there are spurious wakeups */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1190 | } |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1191 | } |
| 1192 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1193 | out: |
| 1194 | if (local_err) { |
Juan Quintela | 7dd59d0 | 2019-08-14 04:02:17 +0200 | [diff] [blame] | 1195 | trace_multifd_send_error(p->id); |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1196 | multifd_send_terminate_threads(local_err); |
| 1197 | } |
| 1198 | |
Ivan Ren | a3ec6b7 | 2019-06-25 21:18:18 +0800 | [diff] [blame] | 1199 | /* |
| 1200 | * Error happen, I will exit, but I can't just leave, tell |
| 1201 | * who pay attention to me. |
| 1202 | */ |
| 1203 | if (ret != 0) { |
Ivan Ren | 2f4aefd | 2019-08-29 10:16:36 +0800 | [diff] [blame] | 1204 | qemu_sem_post(&p->sem_sync); |
Ivan Ren | a3ec6b7 | 2019-06-25 21:18:18 +0800 | [diff] [blame] | 1205 | qemu_sem_post(&multifd_send_state->channels_ready); |
| 1206 | } |
| 1207 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1208 | qemu_mutex_lock(&p->mutex); |
| 1209 | p->running = false; |
| 1210 | qemu_mutex_unlock(&p->mutex); |
| 1211 | |
Lidong Chen | 74637e6 | 2018-08-06 21:29:29 +0800 | [diff] [blame] | 1212 | rcu_unregister_thread(); |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1213 | trace_multifd_send_thread_end(p->id, p->num_packets, p->num_pages); |
| 1214 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1215 | return NULL; |
| 1216 | } |
| 1217 | |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1218 | static void multifd_new_send_channel_async(QIOTask *task, gpointer opaque) |
| 1219 | { |
| 1220 | MultiFDSendParams *p = opaque; |
| 1221 | QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task)); |
| 1222 | Error *local_err = NULL; |
| 1223 | |
Juan Quintela | 7dd59d0 | 2019-08-14 04:02:17 +0200 | [diff] [blame] | 1224 | trace_multifd_new_send_channel_async(p->id); |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1225 | if (qio_task_propagate_error(task, &local_err)) { |
Fei Li | 1398b2e | 2019-01-13 22:08:47 +0800 | [diff] [blame] | 1226 | migrate_set_error(migrate_get_current(), local_err); |
| 1227 | multifd_save_cleanup(); |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1228 | } else { |
| 1229 | p->c = QIO_CHANNEL(sioc); |
| 1230 | qio_channel_set_delay(p->c, false); |
| 1231 | p->running = true; |
| 1232 | qemu_thread_create(&p->thread, p->name, multifd_send_thread, p, |
| 1233 | QEMU_THREAD_JOINABLE); |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1234 | } |
| 1235 | } |
| 1236 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1237 | int multifd_save_setup(void) |
| 1238 | { |
| 1239 | int thread_count; |
Juan Quintela | efd1a1d | 2019-02-20 12:06:03 +0100 | [diff] [blame] | 1240 | uint32_t page_count = MULTIFD_PACKET_SIZE / qemu_target_page_size(); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1241 | uint8_t i; |
| 1242 | |
| 1243 | if (!migrate_use_multifd()) { |
| 1244 | return 0; |
| 1245 | } |
| 1246 | thread_count = migrate_multifd_channels(); |
| 1247 | multifd_send_state = g_malloc0(sizeof(*multifd_send_state)); |
| 1248 | multifd_send_state->params = g_new0(MultiFDSendParams, thread_count); |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1249 | multifd_send_state->pages = multifd_pages_init(page_count); |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1250 | qemu_sem_init(&multifd_send_state->channels_ready, 0); |
Juan Quintela | 4d65a62 | 2019-12-18 05:36:22 +0100 | [diff] [blame] | 1251 | atomic_set(&multifd_send_state->exiting, 0); |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1252 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1253 | for (i = 0; i < thread_count; i++) { |
| 1254 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 1255 | |
| 1256 | qemu_mutex_init(&p->mutex); |
| 1257 | qemu_sem_init(&p->sem, 0); |
Juan Quintela | 18cdcea | 2019-08-14 04:02:14 +0200 | [diff] [blame] | 1258 | qemu_sem_init(&p->sem_sync, 0); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1259 | p->quit = false; |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1260 | p->pending_job = 0; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1261 | p->id = i; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1262 | p->pages = multifd_pages_init(page_count); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 1263 | p->packet_len = sizeof(MultiFDPacket_t) |
| 1264 | + sizeof(ram_addr_t) * page_count; |
| 1265 | p->packet = g_malloc0(p->packet_len); |
Wei Yang | 9985e1f | 2019-10-11 16:50:49 +0800 | [diff] [blame] | 1266 | p->packet->magic = cpu_to_be32(MULTIFD_MAGIC); |
| 1267 | p->packet->version = cpu_to_be32(MULTIFD_VERSION); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1268 | p->name = g_strdup_printf("multifdsend_%d", i); |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1269 | socket_send_channel_create(multifd_new_send_channel_async, p); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1270 | } |
| 1271 | return 0; |
| 1272 | } |
| 1273 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1274 | struct { |
| 1275 | MultiFDRecvParams *params; |
| 1276 | /* number of created threads */ |
| 1277 | int count; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1278 | /* syncs main thread and channels */ |
| 1279 | QemuSemaphore sem_sync; |
| 1280 | /* global number of generated multifd packets */ |
| 1281 | uint64_t packet_num; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1282 | } *multifd_recv_state; |
| 1283 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1284 | static void multifd_recv_terminate_threads(Error *err) |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1285 | { |
| 1286 | int i; |
| 1287 | |
Juan Quintela | 5558c91 | 2019-08-14 04:02:13 +0200 | [diff] [blame] | 1288 | trace_multifd_recv_terminate_threads(err != NULL); |
| 1289 | |
Juan Quintela | 7a169d7 | 2018-02-19 19:01:15 +0100 | [diff] [blame] | 1290 | if (err) { |
| 1291 | MigrationState *s = migrate_get_current(); |
| 1292 | migrate_set_error(s, err); |
| 1293 | if (s->state == MIGRATION_STATUS_SETUP || |
| 1294 | s->state == MIGRATION_STATUS_ACTIVE) { |
| 1295 | migrate_set_state(&s->state, s->state, |
| 1296 | MIGRATION_STATUS_FAILED); |
| 1297 | } |
| 1298 | } |
| 1299 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1300 | for (i = 0; i < migrate_multifd_channels(); i++) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1301 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1302 | |
| 1303 | qemu_mutex_lock(&p->mutex); |
Juan Quintela | 3c3ca25 | 2019-07-24 11:46:24 +0200 | [diff] [blame] | 1304 | p->quit = true; |
Juan Quintela | 7a5cc33 | 2018-04-18 00:49:19 +0200 | [diff] [blame] | 1305 | /* We could arrive here for two reasons: |
| 1306 | - normal quit, i.e. everything went fine, just finished |
| 1307 | - error quit: We close the channels so the channel threads |
| 1308 | finish the qio_channel_read_all_eof() */ |
| 1309 | qio_channel_shutdown(p->c, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1310 | qemu_mutex_unlock(&p->mutex); |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | int multifd_load_cleanup(Error **errp) |
| 1315 | { |
| 1316 | int i; |
| 1317 | int ret = 0; |
| 1318 | |
| 1319 | if (!migrate_use_multifd()) { |
| 1320 | return 0; |
| 1321 | } |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1322 | multifd_recv_terminate_threads(NULL); |
| 1323 | for (i = 0; i < migrate_multifd_channels(); i++) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1324 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1325 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1326 | if (p->running) { |
Juan Quintela | 3c3ca25 | 2019-07-24 11:46:24 +0200 | [diff] [blame] | 1327 | p->quit = true; |
Ivan Ren | f193bc0 | 2019-06-25 21:18:19 +0800 | [diff] [blame] | 1328 | /* |
| 1329 | * multifd_recv_thread may hung at MULTIFD_FLAG_SYNC handle code, |
| 1330 | * however try to wakeup it without harm in cleanup phase. |
| 1331 | */ |
| 1332 | qemu_sem_post(&p->sem_sync); |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1333 | qemu_thread_join(&p->thread); |
| 1334 | } |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1335 | object_unref(OBJECT(p->c)); |
| 1336 | p->c = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1337 | qemu_mutex_destroy(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1338 | qemu_sem_destroy(&p->sem_sync); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1339 | g_free(p->name); |
| 1340 | p->name = NULL; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1341 | multifd_pages_clear(p->pages); |
| 1342 | p->pages = NULL; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 1343 | p->packet_len = 0; |
| 1344 | g_free(p->packet); |
| 1345 | p->packet = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1346 | } |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1347 | qemu_sem_destroy(&multifd_recv_state->sem_sync); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1348 | g_free(multifd_recv_state->params); |
| 1349 | multifd_recv_state->params = NULL; |
| 1350 | g_free(multifd_recv_state); |
| 1351 | multifd_recv_state = NULL; |
| 1352 | |
| 1353 | return ret; |
| 1354 | } |
| 1355 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1356 | static void multifd_recv_sync_main(void) |
| 1357 | { |
| 1358 | int i; |
| 1359 | |
| 1360 | if (!migrate_use_multifd()) { |
| 1361 | return; |
| 1362 | } |
| 1363 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 1364 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1365 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1366 | trace_multifd_recv_sync_main_wait(p->id); |
| 1367 | qemu_sem_wait(&multifd_recv_state->sem_sync); |
Wei Yang | 77568ea | 2019-06-04 10:35:40 +0800 | [diff] [blame] | 1368 | } |
| 1369 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 1370 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1371 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1372 | qemu_mutex_lock(&p->mutex); |
| 1373 | if (multifd_recv_state->packet_num < p->packet_num) { |
| 1374 | multifd_recv_state->packet_num = p->packet_num; |
| 1375 | } |
| 1376 | qemu_mutex_unlock(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1377 | trace_multifd_recv_sync_main_signal(p->id); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1378 | qemu_sem_post(&p->sem_sync); |
| 1379 | } |
| 1380 | trace_multifd_recv_sync_main(multifd_recv_state->packet_num); |
| 1381 | } |
| 1382 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1383 | static void *multifd_recv_thread(void *opaque) |
| 1384 | { |
| 1385 | MultiFDRecvParams *p = opaque; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 1386 | Error *local_err = NULL; |
| 1387 | int ret; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1388 | |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1389 | trace_multifd_recv_thread_start(p->id); |
Lidong Chen | 74637e6 | 2018-08-06 21:29:29 +0800 | [diff] [blame] | 1390 | rcu_register_thread(); |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1391 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1392 | while (true) { |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1393 | uint32_t used; |
| 1394 | uint32_t flags; |
| 1395 | |
Juan Quintela | 3c3ca25 | 2019-07-24 11:46:24 +0200 | [diff] [blame] | 1396 | if (p->quit) { |
| 1397 | break; |
| 1398 | } |
| 1399 | |
Juan Quintela | 8b2db7f | 2018-04-11 12:36:13 +0200 | [diff] [blame] | 1400 | ret = qio_channel_read_all_eof(p->c, (void *)p->packet, |
| 1401 | p->packet_len, &local_err); |
| 1402 | if (ret == 0) { /* EOF */ |
| 1403 | break; |
| 1404 | } |
| 1405 | if (ret == -1) { /* Error */ |
| 1406 | break; |
| 1407 | } |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1408 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1409 | qemu_mutex_lock(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1410 | ret = multifd_recv_unfill_packet(p, &local_err); |
| 1411 | if (ret) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1412 | qemu_mutex_unlock(&p->mutex); |
| 1413 | break; |
| 1414 | } |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1415 | |
| 1416 | used = p->pages->used; |
| 1417 | flags = p->flags; |
Juan Quintela | 2a34ee5 | 2019-01-04 19:45:39 +0100 | [diff] [blame] | 1418 | trace_multifd_recv(p->id, p->packet_num, used, flags, |
| 1419 | p->next_packet_size); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1420 | p->num_packets++; |
| 1421 | p->num_pages += used; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1422 | qemu_mutex_unlock(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1423 | |
Juan Quintela | ad24c7c | 2019-01-04 19:12:35 +0100 | [diff] [blame] | 1424 | if (used) { |
| 1425 | ret = qio_channel_readv_all(p->c, p->pages->iov, |
| 1426 | used, &local_err); |
| 1427 | if (ret != 0) { |
| 1428 | break; |
| 1429 | } |
Juan Quintela | 8b2db7f | 2018-04-11 12:36:13 +0200 | [diff] [blame] | 1430 | } |
| 1431 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1432 | if (flags & MULTIFD_FLAG_SYNC) { |
| 1433 | qemu_sem_post(&multifd_recv_state->sem_sync); |
| 1434 | qemu_sem_wait(&p->sem_sync); |
| 1435 | } |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1436 | } |
| 1437 | |
Juan Quintela | d82628e | 2018-04-11 02:44:24 +0200 | [diff] [blame] | 1438 | if (local_err) { |
| 1439 | multifd_recv_terminate_threads(local_err); |
| 1440 | } |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1441 | qemu_mutex_lock(&p->mutex); |
| 1442 | p->running = false; |
| 1443 | qemu_mutex_unlock(&p->mutex); |
| 1444 | |
Lidong Chen | 74637e6 | 2018-08-06 21:29:29 +0800 | [diff] [blame] | 1445 | rcu_unregister_thread(); |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1446 | trace_multifd_recv_thread_end(p->id, p->num_packets, p->num_pages); |
| 1447 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1448 | return NULL; |
| 1449 | } |
| 1450 | |
| 1451 | int multifd_load_setup(void) |
| 1452 | { |
| 1453 | int thread_count; |
Juan Quintela | efd1a1d | 2019-02-20 12:06:03 +0100 | [diff] [blame] | 1454 | uint32_t page_count = MULTIFD_PACKET_SIZE / qemu_target_page_size(); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1455 | uint8_t i; |
| 1456 | |
| 1457 | if (!migrate_use_multifd()) { |
| 1458 | return 0; |
| 1459 | } |
| 1460 | thread_count = migrate_multifd_channels(); |
| 1461 | multifd_recv_state = g_malloc0(sizeof(*multifd_recv_state)); |
| 1462 | multifd_recv_state->params = g_new0(MultiFDRecvParams, thread_count); |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1463 | atomic_set(&multifd_recv_state->count, 0); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1464 | qemu_sem_init(&multifd_recv_state->sem_sync, 0); |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1465 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1466 | for (i = 0; i < thread_count; i++) { |
| 1467 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1468 | |
| 1469 | qemu_mutex_init(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1470 | qemu_sem_init(&p->sem_sync, 0); |
Juan Quintela | 3c3ca25 | 2019-07-24 11:46:24 +0200 | [diff] [blame] | 1471 | p->quit = false; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1472 | p->id = i; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1473 | p->pages = multifd_pages_init(page_count); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 1474 | p->packet_len = sizeof(MultiFDPacket_t) |
| 1475 | + sizeof(ram_addr_t) * page_count; |
| 1476 | p->packet = g_malloc0(p->packet_len); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1477 | p->name = g_strdup_printf("multifdrecv_%d", i); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1478 | } |
| 1479 | return 0; |
| 1480 | } |
| 1481 | |
Juan Quintela | 62c1e0c | 2018-02-19 18:59:02 +0100 | [diff] [blame] | 1482 | bool multifd_recv_all_channels_created(void) |
| 1483 | { |
| 1484 | int thread_count = migrate_multifd_channels(); |
| 1485 | |
| 1486 | if (!migrate_use_multifd()) { |
| 1487 | return true; |
| 1488 | } |
| 1489 | |
| 1490 | return thread_count == atomic_read(&multifd_recv_state->count); |
| 1491 | } |
| 1492 | |
Fei Li | 49ed0d2 | 2019-01-13 22:08:46 +0800 | [diff] [blame] | 1493 | /* |
| 1494 | * Try to receive all multifd channels to get ready for the migration. |
| 1495 | * - Return true and do not set @errp when correctly receving all channels; |
| 1496 | * - Return false and do not set @errp when correctly receiving the current one; |
| 1497 | * - Return false and set @errp when failing to receive the current channel. |
| 1498 | */ |
| 1499 | bool multifd_recv_new_channel(QIOChannel *ioc, Error **errp) |
Juan Quintela | 71bb07d | 2018-02-19 19:01:03 +0100 | [diff] [blame] | 1500 | { |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1501 | MultiFDRecvParams *p; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1502 | Error *local_err = NULL; |
| 1503 | int id; |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1504 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1505 | id = multifd_recv_initial_packet(ioc, &local_err); |
| 1506 | if (id < 0) { |
| 1507 | multifd_recv_terminate_threads(local_err); |
Fei Li | 49ed0d2 | 2019-01-13 22:08:46 +0800 | [diff] [blame] | 1508 | error_propagate_prepend(errp, local_err, |
| 1509 | "failed to receive packet" |
| 1510 | " via multifd channel %d: ", |
| 1511 | atomic_read(&multifd_recv_state->count)); |
Peter Xu | 81e6205 | 2018-06-27 21:22:44 +0800 | [diff] [blame] | 1512 | return false; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1513 | } |
Juan Quintela | 7dd59d0 | 2019-08-14 04:02:17 +0200 | [diff] [blame] | 1514 | trace_multifd_recv_new_channel(id); |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1515 | |
| 1516 | p = &multifd_recv_state->params[id]; |
| 1517 | if (p->c != NULL) { |
| 1518 | error_setg(&local_err, "multifd: received id '%d' already setup'", |
| 1519 | id); |
| 1520 | multifd_recv_terminate_threads(local_err); |
Fei Li | 49ed0d2 | 2019-01-13 22:08:46 +0800 | [diff] [blame] | 1521 | error_propagate(errp, local_err); |
Peter Xu | 81e6205 | 2018-06-27 21:22:44 +0800 | [diff] [blame] | 1522 | return false; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1523 | } |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1524 | p->c = ioc; |
| 1525 | object_ref(OBJECT(ioc)); |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1526 | /* initial packet */ |
| 1527 | p->num_packets = 1; |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1528 | |
| 1529 | p->running = true; |
| 1530 | qemu_thread_create(&p->thread, p->name, multifd_recv_thread, p, |
| 1531 | QEMU_THREAD_JOINABLE); |
| 1532 | atomic_inc(&multifd_recv_state->count); |
Fei Li | 49ed0d2 | 2019-01-13 22:08:46 +0800 | [diff] [blame] | 1533 | return atomic_read(&multifd_recv_state->count) == |
| 1534 | migrate_multifd_channels(); |
Juan Quintela | 71bb07d | 2018-02-19 19:01:03 +0100 | [diff] [blame] | 1535 | } |
| 1536 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1537 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1538 | * save_page_header: write page header to wire |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1539 | * |
| 1540 | * If this is the 1st block, it also writes the block identification |
| 1541 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1542 | * Returns the number of bytes written |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1543 | * |
| 1544 | * @f: QEMUFile where to send the data |
| 1545 | * @block: block that contains the page we want to send |
| 1546 | * @offset: offset inside the block for the page |
| 1547 | * in the lower bits, it contains flags |
| 1548 | */ |
Juan Quintela | 2bf3aa8 | 2017-05-10 13:28:13 +0200 | [diff] [blame] | 1549 | static size_t save_page_header(RAMState *rs, QEMUFile *f, RAMBlock *block, |
| 1550 | ram_addr_t offset) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1551 | { |
Liang Li | 9f5f380 | 2015-07-13 17:34:10 +0800 | [diff] [blame] | 1552 | size_t size, len; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1553 | |
Juan Quintela | 2479569 | 2017-03-21 11:45:01 +0100 | [diff] [blame] | 1554 | if (block == rs->last_sent_block) { |
| 1555 | offset |= RAM_SAVE_FLAG_CONTINUE; |
| 1556 | } |
Juan Quintela | 2bf3aa8 | 2017-05-10 13:28:13 +0200 | [diff] [blame] | 1557 | qemu_put_be64(f, offset); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1558 | size = 8; |
| 1559 | |
| 1560 | if (!(offset & RAM_SAVE_FLAG_CONTINUE)) { |
Liang Li | 9f5f380 | 2015-07-13 17:34:10 +0800 | [diff] [blame] | 1561 | len = strlen(block->idstr); |
Juan Quintela | 2bf3aa8 | 2017-05-10 13:28:13 +0200 | [diff] [blame] | 1562 | qemu_put_byte(f, len); |
| 1563 | qemu_put_buffer(f, (uint8_t *)block->idstr, len); |
Liang Li | 9f5f380 | 2015-07-13 17:34:10 +0800 | [diff] [blame] | 1564 | size += 1 + len; |
Juan Quintela | 2479569 | 2017-03-21 11:45:01 +0100 | [diff] [blame] | 1565 | rs->last_sent_block = block; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1566 | } |
| 1567 | return size; |
| 1568 | } |
| 1569 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1570 | /** |
| 1571 | * mig_throttle_guest_down: throotle down the guest |
| 1572 | * |
| 1573 | * Reduce amount of guest cpu execution to hopefully slow down memory |
| 1574 | * writes. If guest dirty memory rate is reduced below the rate at |
| 1575 | * which we can transfer pages to the destination then we should be |
| 1576 | * able to complete migration. Some workloads dirty memory way too |
| 1577 | * fast and will not effectively converge, even with auto-converge. |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1578 | */ |
| 1579 | static void mig_throttle_guest_down(void) |
| 1580 | { |
| 1581 | MigrationState *s = migrate_get_current(); |
Daniel P. Berrange | 2594f56 | 2016-04-27 11:05:14 +0100 | [diff] [blame] | 1582 | uint64_t pct_initial = s->parameters.cpu_throttle_initial; |
| 1583 | uint64_t pct_icrement = s->parameters.cpu_throttle_increment; |
Li Qiang | 4cbc9c7 | 2018-08-01 06:00:20 -0700 | [diff] [blame] | 1584 | int pct_max = s->parameters.max_cpu_throttle; |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1585 | |
| 1586 | /* We have not started throttling yet. Let's start it. */ |
| 1587 | if (!cpu_throttle_active()) { |
| 1588 | cpu_throttle_set(pct_initial); |
| 1589 | } else { |
| 1590 | /* Throttling already on, just increase the rate */ |
Li Qiang | 4cbc9c7 | 2018-08-01 06:00:20 -0700 | [diff] [blame] | 1591 | cpu_throttle_set(MIN(cpu_throttle_get_percentage() + pct_icrement, |
| 1592 | pct_max)); |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1593 | } |
| 1594 | } |
| 1595 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1596 | /** |
| 1597 | * xbzrle_cache_zero_page: insert a zero page in the XBZRLE cache |
| 1598 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 1599 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1600 | * @current_addr: address for the zero page |
| 1601 | * |
| 1602 | * Update the xbzrle cache to reflect a page that's been sent as all 0. |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1603 | * The important thing is that a stale (not-yet-0'd) page be replaced |
| 1604 | * by the new data. |
| 1605 | * As a bonus, if the page wasn't in the cache it gets added so that |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1606 | * when a small write is made into the 0'd page it gets XBZRLE sent. |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1607 | */ |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 1608 | static void xbzrle_cache_zero_page(RAMState *rs, ram_addr_t current_addr) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1609 | { |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 1610 | if (rs->ram_bulk_stage || !migrate_use_xbzrle()) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1611 | return; |
| 1612 | } |
| 1613 | |
| 1614 | /* We don't care if this fails to allocate a new cache page |
| 1615 | * as long as it updated an old one */ |
Juan Quintela | c00e092 | 2017-05-09 16:22:01 +0200 | [diff] [blame] | 1616 | cache_insert(XBZRLE.cache, current_addr, XBZRLE.zero_target_page, |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1617 | ram_counters.dirty_sync_count); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1618 | } |
| 1619 | |
| 1620 | #define ENCODING_FLAG_XBZRLE 0x1 |
| 1621 | |
| 1622 | /** |
| 1623 | * save_xbzrle_page: compress and send current page |
| 1624 | * |
| 1625 | * Returns: 1 means that we wrote the page |
| 1626 | * 0 means that page is identical to the one already sent |
| 1627 | * -1 means that xbzrle would be longer than normal |
| 1628 | * |
Juan Quintela | 5a98773 | 2017-03-13 19:39:02 +0100 | [diff] [blame] | 1629 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1630 | * @current_data: pointer to the address of the page contents |
| 1631 | * @current_addr: addr of the page |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1632 | * @block: block that contains the page we want to send |
| 1633 | * @offset: offset inside the block for the page |
| 1634 | * @last_stage: if we are at the completion stage |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1635 | */ |
Juan Quintela | 204b88b | 2017-03-15 09:16:57 +0100 | [diff] [blame] | 1636 | static int save_xbzrle_page(RAMState *rs, uint8_t **current_data, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1637 | ram_addr_t current_addr, RAMBlock *block, |
Juan Quintela | 072c251 | 2017-03-14 10:27:31 +0100 | [diff] [blame] | 1638 | ram_addr_t offset, bool last_stage) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1639 | { |
| 1640 | int encoded_len = 0, bytes_xbzrle; |
| 1641 | uint8_t *prev_cached_page; |
| 1642 | |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1643 | if (!cache_is_cached(XBZRLE.cache, current_addr, |
| 1644 | ram_counters.dirty_sync_count)) { |
| 1645 | xbzrle_counters.cache_miss++; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1646 | if (!last_stage) { |
| 1647 | if (cache_insert(XBZRLE.cache, current_addr, *current_data, |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1648 | ram_counters.dirty_sync_count) == -1) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1649 | return -1; |
| 1650 | } else { |
| 1651 | /* update *current_data when the page has been |
| 1652 | inserted into cache */ |
| 1653 | *current_data = get_cached_data(XBZRLE.cache, current_addr); |
| 1654 | } |
| 1655 | } |
| 1656 | return -1; |
| 1657 | } |
| 1658 | |
| 1659 | prev_cached_page = get_cached_data(XBZRLE.cache, current_addr); |
| 1660 | |
| 1661 | /* save current buffer into memory */ |
| 1662 | memcpy(XBZRLE.current_buf, *current_data, TARGET_PAGE_SIZE); |
| 1663 | |
| 1664 | /* XBZRLE encoding (if there is no overflow) */ |
| 1665 | encoded_len = xbzrle_encode_buffer(prev_cached_page, XBZRLE.current_buf, |
| 1666 | TARGET_PAGE_SIZE, XBZRLE.encoded_buf, |
| 1667 | TARGET_PAGE_SIZE); |
Wei Yang | ca35380 | 2019-06-10 08:41:59 +0800 | [diff] [blame] | 1668 | |
| 1669 | /* |
| 1670 | * Update the cache contents, so that it corresponds to the data |
| 1671 | * sent, in all cases except where we skip the page. |
| 1672 | */ |
| 1673 | if (!last_stage && encoded_len != 0) { |
| 1674 | memcpy(prev_cached_page, XBZRLE.current_buf, TARGET_PAGE_SIZE); |
| 1675 | /* |
| 1676 | * In the case where we couldn't compress, ensure that the caller |
| 1677 | * sends the data from the cache, since the guest might have |
| 1678 | * changed the RAM since we copied it. |
| 1679 | */ |
| 1680 | *current_data = prev_cached_page; |
| 1681 | } |
| 1682 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1683 | if (encoded_len == 0) { |
Juan Quintela | 55c4446 | 2017-01-23 22:32:05 +0100 | [diff] [blame] | 1684 | trace_save_xbzrle_page_skipping(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1685 | return 0; |
| 1686 | } else if (encoded_len == -1) { |
Juan Quintela | 55c4446 | 2017-01-23 22:32:05 +0100 | [diff] [blame] | 1687 | trace_save_xbzrle_page_overflow(); |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1688 | xbzrle_counters.overflow++; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1689 | return -1; |
| 1690 | } |
| 1691 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1692 | /* Send XBZRLE based compressed page */ |
Juan Quintela | 2bf3aa8 | 2017-05-10 13:28:13 +0200 | [diff] [blame] | 1693 | bytes_xbzrle = save_page_header(rs, rs->f, block, |
Juan Quintela | 204b88b | 2017-03-15 09:16:57 +0100 | [diff] [blame] | 1694 | offset | RAM_SAVE_FLAG_XBZRLE); |
| 1695 | qemu_put_byte(rs->f, ENCODING_FLAG_XBZRLE); |
| 1696 | qemu_put_be16(rs->f, encoded_len); |
| 1697 | qemu_put_buffer(rs->f, XBZRLE.encoded_buf, encoded_len); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1698 | bytes_xbzrle += encoded_len + 1 + 2; |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1699 | xbzrle_counters.pages++; |
| 1700 | xbzrle_counters.bytes += bytes_xbzrle; |
| 1701 | ram_counters.transferred += bytes_xbzrle; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1702 | |
| 1703 | return 1; |
| 1704 | } |
| 1705 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1706 | /** |
| 1707 | * migration_bitmap_find_dirty: find the next dirty page from start |
Dr. David Alan Gilbert | f3f491f | 2015-11-05 18:11:01 +0000 | [diff] [blame] | 1708 | * |
Wei Yang | a5f7b1a | 2019-05-11 07:37:29 +0800 | [diff] [blame] | 1709 | * Returns the page offset within memory region of the start of a dirty page |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1710 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 1711 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1712 | * @rb: RAMBlock where to search for dirty pages |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 1713 | * @start: page where we start the search |
Dr. David Alan Gilbert | f3f491f | 2015-11-05 18:11:01 +0000 | [diff] [blame] | 1714 | */ |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1715 | static inline |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 1716 | unsigned long migration_bitmap_find_dirty(RAMState *rs, RAMBlock *rb, |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 1717 | unsigned long start) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1718 | { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1719 | unsigned long size = rb->used_length >> TARGET_PAGE_BITS; |
| 1720 | unsigned long *bitmap = rb->bmap; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1721 | unsigned long next; |
| 1722 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 1723 | if (ramblock_is_ignored(rb)) { |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 1724 | return size; |
| 1725 | } |
| 1726 | |
Wei Wang | 6eeb63f | 2018-12-11 16:24:52 +0800 | [diff] [blame] | 1727 | /* |
| 1728 | * When the free page optimization is enabled, we need to check the bitmap |
| 1729 | * to send the non-free pages rather than all the pages in the bulk stage. |
| 1730 | */ |
| 1731 | if (!rs->fpo_enabled && rs->ram_bulk_stage && start > 0) { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1732 | next = start + 1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1733 | } else { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1734 | next = find_next_bit(bitmap, size, start); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1735 | } |
| 1736 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1737 | return next; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1738 | } |
| 1739 | |
Juan Quintela | 06b1068 | 2017-03-21 15:18:05 +0100 | [diff] [blame] | 1740 | static inline bool migration_bitmap_clear_dirty(RAMState *rs, |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 1741 | RAMBlock *rb, |
| 1742 | unsigned long page) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 1743 | { |
| 1744 | bool ret; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 1745 | |
Wei Wang | 386a907 | 2018-12-11 16:24:49 +0800 | [diff] [blame] | 1746 | qemu_mutex_lock(&rs->bitmap_mutex); |
Peter Xu | 002cad6 | 2019-06-03 14:50:56 +0800 | [diff] [blame] | 1747 | |
| 1748 | /* |
| 1749 | * Clear dirty bitmap if needed. This _must_ be called before we |
| 1750 | * send any of the page in the chunk because we need to make sure |
| 1751 | * we can capture further page content changes when we sync dirty |
| 1752 | * log the next time. So as long as we are going to send any of |
| 1753 | * the page in the chunk we clear the remote dirty bitmap for all. |
| 1754 | * Clearing it earlier won't be a problem, but too late will. |
| 1755 | */ |
| 1756 | if (rb->clear_bmap && clear_bmap_test_and_clear(rb, page)) { |
| 1757 | uint8_t shift = rb->clear_bmap_shift; |
| 1758 | hwaddr size = 1ULL << (TARGET_PAGE_BITS + shift); |
| 1759 | hwaddr start = (page << TARGET_PAGE_BITS) & (-size); |
| 1760 | |
| 1761 | /* |
| 1762 | * CLEAR_BITMAP_SHIFT_MIN should always guarantee this... this |
| 1763 | * can make things easier sometimes since then start address |
| 1764 | * of the small chunk will always be 64 pages aligned so the |
| 1765 | * bitmap will always be aligned to unsigned long. We should |
| 1766 | * even be able to remove this restriction but I'm simply |
| 1767 | * keeping it. |
| 1768 | */ |
| 1769 | assert(shift >= 6); |
| 1770 | trace_migration_bitmap_clear_dirty(rb->idstr, start, size, page); |
| 1771 | memory_region_clear_dirty_bitmap(rb->mr, start, size); |
| 1772 | } |
| 1773 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1774 | ret = test_and_clear_bit(page, rb->bmap); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 1775 | |
| 1776 | if (ret) { |
Juan Quintela | 0d8ec88 | 2017-03-13 21:21:41 +0100 | [diff] [blame] | 1777 | rs->migration_dirty_pages--; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 1778 | } |
Wei Wang | 386a907 | 2018-12-11 16:24:49 +0800 | [diff] [blame] | 1779 | qemu_mutex_unlock(&rs->bitmap_mutex); |
| 1780 | |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 1781 | return ret; |
| 1782 | } |
| 1783 | |
Peter Xu | 267691b | 2019-06-03 14:50:46 +0800 | [diff] [blame] | 1784 | /* Called with RCU critical section */ |
Wei Yang | 7a3e957 | 2019-08-08 11:31:55 +0800 | [diff] [blame] | 1785 | static void ramblock_sync_dirty_bitmap(RAMState *rs, RAMBlock *rb) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1786 | { |
Juan Quintela | 0d8ec88 | 2017-03-13 21:21:41 +0100 | [diff] [blame] | 1787 | rs->migration_dirty_pages += |
Wei Yang | 5d0980a | 2019-07-18 09:25:47 +0800 | [diff] [blame] | 1788 | cpu_physical_memory_sync_dirty_bitmap(rb, 0, rb->used_length, |
Juan Quintela | 0d8ec88 | 2017-03-13 21:21:41 +0100 | [diff] [blame] | 1789 | &rs->num_dirty_pages_period); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1790 | } |
| 1791 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1792 | /** |
| 1793 | * ram_pagesize_summary: calculate all the pagesizes of a VM |
| 1794 | * |
| 1795 | * Returns a summary bitmap of the page sizes of all RAMBlocks |
| 1796 | * |
| 1797 | * For VMs with just normal pages this is equivalent to the host page |
| 1798 | * size. If it's got some huge pages then it's the OR of all the |
| 1799 | * different page sizes. |
Dr. David Alan Gilbert | e8ca1db | 2017-02-24 18:28:29 +0000 | [diff] [blame] | 1800 | */ |
| 1801 | uint64_t ram_pagesize_summary(void) |
| 1802 | { |
| 1803 | RAMBlock *block; |
| 1804 | uint64_t summary = 0; |
| 1805 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 1806 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Dr. David Alan Gilbert | e8ca1db | 2017-02-24 18:28:29 +0000 | [diff] [blame] | 1807 | summary |= block->page_size; |
| 1808 | } |
| 1809 | |
| 1810 | return summary; |
| 1811 | } |
| 1812 | |
Xiao Guangrong | aecbfe9 | 2019-01-11 14:37:30 +0800 | [diff] [blame] | 1813 | uint64_t ram_get_total_transferred_pages(void) |
| 1814 | { |
| 1815 | return ram_counters.normal + ram_counters.duplicate + |
| 1816 | compression_counters.pages + xbzrle_counters.pages; |
| 1817 | } |
| 1818 | |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1819 | static void migration_update_rates(RAMState *rs, int64_t end_time) |
| 1820 | { |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 1821 | uint64_t page_count = rs->target_page_count - rs->target_page_count_prev; |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 1822 | double compressed_size; |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1823 | |
| 1824 | /* calculate period counters */ |
| 1825 | ram_counters.dirty_pages_rate = rs->num_dirty_pages_period * 1000 |
| 1826 | / (end_time - rs->time_last_bitmap_sync); |
| 1827 | |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 1828 | if (!page_count) { |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1829 | return; |
| 1830 | } |
| 1831 | |
| 1832 | if (migrate_use_xbzrle()) { |
| 1833 | xbzrle_counters.cache_miss_rate = (double)(xbzrle_counters.cache_miss - |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 1834 | rs->xbzrle_cache_miss_prev) / page_count; |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1835 | rs->xbzrle_cache_miss_prev = xbzrle_counters.cache_miss; |
| 1836 | } |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 1837 | |
| 1838 | if (migrate_use_compression()) { |
| 1839 | compression_counters.busy_rate = (double)(compression_counters.busy - |
| 1840 | rs->compress_thread_busy_prev) / page_count; |
| 1841 | rs->compress_thread_busy_prev = compression_counters.busy; |
| 1842 | |
| 1843 | compressed_size = compression_counters.compressed_size - |
| 1844 | rs->compressed_size_prev; |
| 1845 | if (compressed_size) { |
| 1846 | double uncompressed_size = (compression_counters.pages - |
| 1847 | rs->compress_pages_prev) * TARGET_PAGE_SIZE; |
| 1848 | |
| 1849 | /* Compression-Ratio = Uncompressed-size / Compressed-size */ |
| 1850 | compression_counters.compression_rate = |
| 1851 | uncompressed_size / compressed_size; |
| 1852 | |
| 1853 | rs->compress_pages_prev = compression_counters.pages; |
| 1854 | rs->compressed_size_prev = compression_counters.compressed_size; |
| 1855 | } |
| 1856 | } |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1857 | } |
| 1858 | |
Juan Quintela | 8d820d6 | 2017-03-13 19:35:50 +0100 | [diff] [blame] | 1859 | static void migration_bitmap_sync(RAMState *rs) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1860 | { |
| 1861 | RAMBlock *block; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1862 | int64_t end_time; |
Juan Quintela | c4bdf0c | 2017-03-28 14:59:54 +0200 | [diff] [blame] | 1863 | uint64_t bytes_xfer_now; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1864 | |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1865 | ram_counters.dirty_sync_count++; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1866 | |
Juan Quintela | f664da8 | 2017-03-13 19:44:57 +0100 | [diff] [blame] | 1867 | if (!rs->time_last_bitmap_sync) { |
| 1868 | rs->time_last_bitmap_sync = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1869 | } |
| 1870 | |
| 1871 | trace_migration_bitmap_sync_start(); |
Paolo Bonzini | 9c1f8f4 | 2016-09-22 16:08:31 +0200 | [diff] [blame] | 1872 | memory_global_dirty_log_sync(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1873 | |
Juan Quintela | 108cfae | 2017-03-13 21:38:09 +0100 | [diff] [blame] | 1874 | qemu_mutex_lock(&rs->bitmap_mutex); |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 1875 | WITH_RCU_READ_LOCK_GUARD() { |
| 1876 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
| 1877 | ramblock_sync_dirty_bitmap(rs, block); |
| 1878 | } |
| 1879 | ram_counters.remaining = ram_bytes_remaining(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1880 | } |
Juan Quintela | 108cfae | 2017-03-13 21:38:09 +0100 | [diff] [blame] | 1881 | qemu_mutex_unlock(&rs->bitmap_mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1882 | |
Paolo Bonzini | 9458a9a | 2018-02-06 18:37:39 +0100 | [diff] [blame] | 1883 | memory_global_after_dirty_log_sync(); |
Juan Quintela | a66cd90 | 2017-03-28 15:02:43 +0200 | [diff] [blame] | 1884 | trace_migration_bitmap_sync_end(rs->num_dirty_pages_period); |
Chao Fan | 1ffb5df | 2017-03-14 09:55:07 +0800 | [diff] [blame] | 1885 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1886 | end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
| 1887 | |
| 1888 | /* more than 1 second = 1000 millisecons */ |
Juan Quintela | f664da8 | 2017-03-13 19:44:57 +0100 | [diff] [blame] | 1889 | if (end_time > rs->time_last_bitmap_sync + 1000) { |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1890 | bytes_xfer_now = ram_counters.transferred; |
Felipe Franciosi | d693c6f | 2017-05-24 17:10:01 +0100 | [diff] [blame] | 1891 | |
Peter Lieven | 9ac78b6 | 2017-09-26 12:33:16 +0200 | [diff] [blame] | 1892 | /* During block migration the auto-converge logic incorrectly detects |
| 1893 | * that ram migration makes no progress. Avoid this by disabling the |
| 1894 | * throttling logic during the bulk phase of block migration. */ |
| 1895 | if (migrate_auto_converge() && !blk_mig_bulk_active()) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1896 | /* The following detection logic can be refined later. For now: |
| 1897 | Check to see if the dirtied bytes is 50% more than the approx. |
| 1898 | amount of bytes that just got transferred since the last time we |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1899 | were in this routine. If that happens twice, start or increase |
| 1900 | throttling */ |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1901 | |
Felipe Franciosi | d693c6f | 2017-05-24 17:10:01 +0100 | [diff] [blame] | 1902 | if ((rs->num_dirty_pages_period * TARGET_PAGE_SIZE > |
Juan Quintela | eac7415 | 2017-03-28 14:59:01 +0200 | [diff] [blame] | 1903 | (bytes_xfer_now - rs->bytes_xfer_prev) / 2) && |
Felipe Franciosi | b4a3c64 | 2017-05-24 17:10:03 +0100 | [diff] [blame] | 1904 | (++rs->dirty_rate_high_cnt >= 2)) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1905 | trace_migration_throttle(); |
Juan Quintela | 8d820d6 | 2017-03-13 19:35:50 +0100 | [diff] [blame] | 1906 | rs->dirty_rate_high_cnt = 0; |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1907 | mig_throttle_guest_down(); |
Felipe Franciosi | d693c6f | 2017-05-24 17:10:01 +0100 | [diff] [blame] | 1908 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1909 | } |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1910 | |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1911 | migration_update_rates(rs, end_time); |
| 1912 | |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 1913 | rs->target_page_count_prev = rs->target_page_count; |
Felipe Franciosi | d693c6f | 2017-05-24 17:10:01 +0100 | [diff] [blame] | 1914 | |
| 1915 | /* reset period counters */ |
Juan Quintela | f664da8 | 2017-03-13 19:44:57 +0100 | [diff] [blame] | 1916 | rs->time_last_bitmap_sync = end_time; |
Juan Quintela | a66cd90 | 2017-03-28 15:02:43 +0200 | [diff] [blame] | 1917 | rs->num_dirty_pages_period = 0; |
Felipe Franciosi | d2a4d85 | 2017-05-24 17:10:02 +0100 | [diff] [blame] | 1918 | rs->bytes_xfer_prev = bytes_xfer_now; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1919 | } |
Dr. David Alan Gilbert | 4addcd4 | 2015-12-16 11:47:36 +0000 | [diff] [blame] | 1920 | if (migrate_use_events()) { |
Peter Xu | 3ab7238 | 2018-08-15 21:37:37 +0800 | [diff] [blame] | 1921 | qapi_event_send_migration_pass(ram_counters.dirty_sync_count); |
Dr. David Alan Gilbert | 4addcd4 | 2015-12-16 11:47:36 +0000 | [diff] [blame] | 1922 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1923 | } |
| 1924 | |
Wei Wang | bd22706 | 2018-12-11 16:24:51 +0800 | [diff] [blame] | 1925 | static void migration_bitmap_sync_precopy(RAMState *rs) |
| 1926 | { |
| 1927 | Error *local_err = NULL; |
| 1928 | |
| 1929 | /* |
| 1930 | * The current notifier usage is just an optimization to migration, so we |
| 1931 | * don't stop the normal migration process in the error case. |
| 1932 | */ |
| 1933 | if (precopy_notify(PRECOPY_NOTIFY_BEFORE_BITMAP_SYNC, &local_err)) { |
| 1934 | error_report_err(local_err); |
| 1935 | } |
| 1936 | |
| 1937 | migration_bitmap_sync(rs); |
| 1938 | |
| 1939 | if (precopy_notify(PRECOPY_NOTIFY_AFTER_BITMAP_SYNC, &local_err)) { |
| 1940 | error_report_err(local_err); |
| 1941 | } |
| 1942 | } |
| 1943 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1944 | /** |
Xiao Guangrong | 6c97ec5 | 2018-08-21 16:10:22 +0800 | [diff] [blame] | 1945 | * save_zero_page_to_file: send the zero page to the file |
| 1946 | * |
| 1947 | * Returns the size of data written to the file, 0 means the page is not |
| 1948 | * a zero page |
| 1949 | * |
| 1950 | * @rs: current RAM state |
| 1951 | * @file: the file where the data is saved |
| 1952 | * @block: block that contains the page we want to send |
| 1953 | * @offset: offset inside the block for the page |
| 1954 | */ |
| 1955 | static int save_zero_page_to_file(RAMState *rs, QEMUFile *file, |
| 1956 | RAMBlock *block, ram_addr_t offset) |
| 1957 | { |
| 1958 | uint8_t *p = block->host + offset; |
| 1959 | int len = 0; |
| 1960 | |
| 1961 | if (is_zero_range(p, TARGET_PAGE_SIZE)) { |
| 1962 | len += save_page_header(rs, file, block, offset | RAM_SAVE_FLAG_ZERO); |
| 1963 | qemu_put_byte(file, 0); |
| 1964 | len += 1; |
| 1965 | } |
| 1966 | return len; |
| 1967 | } |
| 1968 | |
| 1969 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1970 | * save_zero_page: send the zero page to the stream |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1971 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1972 | * Returns the number of pages written. |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1973 | * |
Juan Quintela | f7ccd61 | 2017-03-13 20:30:21 +0100 | [diff] [blame] | 1974 | * @rs: current RAM state |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1975 | * @block: block that contains the page we want to send |
| 1976 | * @offset: offset inside the block for the page |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1977 | */ |
Juan Quintela | 7faccdc | 2018-01-08 18:58:17 +0100 | [diff] [blame] | 1978 | static int save_zero_page(RAMState *rs, RAMBlock *block, ram_addr_t offset) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1979 | { |
Xiao Guangrong | 6c97ec5 | 2018-08-21 16:10:22 +0800 | [diff] [blame] | 1980 | int len = save_zero_page_to_file(rs, rs->f, block, offset); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1981 | |
Xiao Guangrong | 6c97ec5 | 2018-08-21 16:10:22 +0800 | [diff] [blame] | 1982 | if (len) { |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1983 | ram_counters.duplicate++; |
Xiao Guangrong | 6c97ec5 | 2018-08-21 16:10:22 +0800 | [diff] [blame] | 1984 | ram_counters.transferred += len; |
| 1985 | return 1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1986 | } |
Xiao Guangrong | 6c97ec5 | 2018-08-21 16:10:22 +0800 | [diff] [blame] | 1987 | return -1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1988 | } |
| 1989 | |
Juan Quintela | 5727309 | 2017-03-20 22:25:28 +0100 | [diff] [blame] | 1990 | static void ram_release_pages(const char *rbname, uint64_t offset, int pages) |
Pavel Butsykin | 53f09a1 | 2017-02-03 18:23:20 +0300 | [diff] [blame] | 1991 | { |
Juan Quintela | 5727309 | 2017-03-20 22:25:28 +0100 | [diff] [blame] | 1992 | if (!migrate_release_ram() || !migration_in_postcopy()) { |
Pavel Butsykin | 53f09a1 | 2017-02-03 18:23:20 +0300 | [diff] [blame] | 1993 | return; |
| 1994 | } |
| 1995 | |
Juan Quintela | aaa2064 | 2017-03-21 11:35:24 +0100 | [diff] [blame] | 1996 | ram_discard_range(rbname, offset, pages << TARGET_PAGE_BITS); |
Pavel Butsykin | 53f09a1 | 2017-02-03 18:23:20 +0300 | [diff] [blame] | 1997 | } |
| 1998 | |
Xiao Guangrong | 059ff0f | 2018-03-30 15:51:23 +0800 | [diff] [blame] | 1999 | /* |
| 2000 | * @pages: the number of pages written by the control path, |
| 2001 | * < 0 - error |
| 2002 | * > 0 - number of pages written |
| 2003 | * |
| 2004 | * Return true if the pages has been saved, otherwise false is returned. |
| 2005 | */ |
| 2006 | static bool control_save_page(RAMState *rs, RAMBlock *block, ram_addr_t offset, |
| 2007 | int *pages) |
| 2008 | { |
| 2009 | uint64_t bytes_xmit = 0; |
| 2010 | int ret; |
| 2011 | |
| 2012 | *pages = -1; |
| 2013 | ret = ram_control_save_page(rs->f, block->offset, offset, TARGET_PAGE_SIZE, |
| 2014 | &bytes_xmit); |
| 2015 | if (ret == RAM_SAVE_CONTROL_NOT_SUPP) { |
| 2016 | return false; |
| 2017 | } |
| 2018 | |
| 2019 | if (bytes_xmit) { |
| 2020 | ram_counters.transferred += bytes_xmit; |
| 2021 | *pages = 1; |
| 2022 | } |
| 2023 | |
| 2024 | if (ret == RAM_SAVE_CONTROL_DELAYED) { |
| 2025 | return true; |
| 2026 | } |
| 2027 | |
| 2028 | if (bytes_xmit > 0) { |
| 2029 | ram_counters.normal++; |
| 2030 | } else if (bytes_xmit == 0) { |
| 2031 | ram_counters.duplicate++; |
| 2032 | } |
| 2033 | |
| 2034 | return true; |
| 2035 | } |
| 2036 | |
Xiao Guangrong | 65dacaa | 2018-03-30 15:51:27 +0800 | [diff] [blame] | 2037 | /* |
| 2038 | * directly send the page to the stream |
| 2039 | * |
| 2040 | * Returns the number of pages written. |
| 2041 | * |
| 2042 | * @rs: current RAM state |
| 2043 | * @block: block that contains the page we want to send |
| 2044 | * @offset: offset inside the block for the page |
| 2045 | * @buf: the page to be sent |
| 2046 | * @async: send to page asyncly |
| 2047 | */ |
| 2048 | static int save_normal_page(RAMState *rs, RAMBlock *block, ram_addr_t offset, |
| 2049 | uint8_t *buf, bool async) |
| 2050 | { |
| 2051 | ram_counters.transferred += save_page_header(rs, rs->f, block, |
| 2052 | offset | RAM_SAVE_FLAG_PAGE); |
| 2053 | if (async) { |
| 2054 | qemu_put_buffer_async(rs->f, buf, TARGET_PAGE_SIZE, |
| 2055 | migrate_release_ram() & |
| 2056 | migration_in_postcopy()); |
| 2057 | } else { |
| 2058 | qemu_put_buffer(rs->f, buf, TARGET_PAGE_SIZE); |
| 2059 | } |
| 2060 | ram_counters.transferred += TARGET_PAGE_SIZE; |
| 2061 | ram_counters.normal++; |
| 2062 | return 1; |
| 2063 | } |
| 2064 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2065 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2066 | * ram_save_page: send the given page to the stream |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2067 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2068 | * Returns the number of pages written. |
Dr. David Alan Gilbert | 3fd3c4b | 2015-12-10 16:31:46 +0000 | [diff] [blame] | 2069 | * < 0 - error |
| 2070 | * >=0 - Number of pages written - this might legally be 0 |
| 2071 | * if xbzrle noticed the page was the same. |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2072 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2073 | * @rs: current RAM state |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2074 | * @block: block that contains the page we want to send |
| 2075 | * @offset: offset inside the block for the page |
| 2076 | * @last_stage: if we are at the completion stage |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2077 | */ |
Juan Quintela | a0a8aa1 | 2017-03-20 22:29:07 +0100 | [diff] [blame] | 2078 | static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2079 | { |
| 2080 | int pages = -1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2081 | uint8_t *p; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2082 | bool send_async = true; |
zhanghailiang | a08f689 | 2016-01-15 11:37:44 +0800 | [diff] [blame] | 2083 | RAMBlock *block = pss->block; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2084 | ram_addr_t offset = pss->page << TARGET_PAGE_BITS; |
Xiao Guangrong | 059ff0f | 2018-03-30 15:51:23 +0800 | [diff] [blame] | 2085 | ram_addr_t current_addr = block->offset + offset; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2086 | |
Dr. David Alan Gilbert | 2f68e39 | 2015-08-13 11:51:30 +0100 | [diff] [blame] | 2087 | p = block->host + offset; |
Dr. David Alan Gilbert | 1db9d8e | 2017-04-26 19:37:21 +0100 | [diff] [blame] | 2088 | trace_ram_save_page(block->idstr, (uint64_t)offset, p); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2089 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2090 | XBZRLE_cache_lock(); |
Xiao Guangrong | d7400a3 | 2018-03-30 15:51:26 +0800 | [diff] [blame] | 2091 | if (!rs->ram_bulk_stage && !migration_in_postcopy() && |
| 2092 | migrate_use_xbzrle()) { |
Xiao Guangrong | 059ff0f | 2018-03-30 15:51:23 +0800 | [diff] [blame] | 2093 | pages = save_xbzrle_page(rs, &p, current_addr, block, |
| 2094 | offset, last_stage); |
| 2095 | if (!last_stage) { |
| 2096 | /* Can't send this cached data async, since the cache page |
| 2097 | * might get updated before it gets to the wire |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2098 | */ |
Xiao Guangrong | 059ff0f | 2018-03-30 15:51:23 +0800 | [diff] [blame] | 2099 | send_async = false; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2100 | } |
| 2101 | } |
| 2102 | |
| 2103 | /* XBZRLE overflow or normal page */ |
| 2104 | if (pages == -1) { |
Xiao Guangrong | 65dacaa | 2018-03-30 15:51:27 +0800 | [diff] [blame] | 2105 | pages = save_normal_page(rs, block, offset, p, send_async); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2106 | } |
| 2107 | |
| 2108 | XBZRLE_cache_unlock(); |
| 2109 | |
| 2110 | return pages; |
| 2111 | } |
| 2112 | |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 2113 | static int ram_save_multifd_page(RAMState *rs, RAMBlock *block, |
| 2114 | ram_addr_t offset) |
| 2115 | { |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 2116 | if (multifd_queue_page(rs, block, offset) < 0) { |
Ivan Ren | 713f762 | 2019-06-25 21:18:17 +0800 | [diff] [blame] | 2117 | return -1; |
| 2118 | } |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 2119 | ram_counters.normal++; |
| 2120 | |
| 2121 | return 1; |
| 2122 | } |
| 2123 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2124 | static bool do_compress_ram_page(QEMUFile *f, z_stream *stream, RAMBlock *block, |
Xiao Guangrong | 6ef3771 | 2018-08-21 16:10:23 +0800 | [diff] [blame] | 2125 | ram_addr_t offset, uint8_t *source_buf) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2126 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 2127 | RAMState *rs = ram_state; |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2128 | uint8_t *p = block->host + (offset & TARGET_PAGE_MASK); |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2129 | bool zero_page = false; |
Xiao Guangrong | 6ef3771 | 2018-08-21 16:10:23 +0800 | [diff] [blame] | 2130 | int ret; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2131 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2132 | if (save_zero_page_to_file(rs, f, block, offset)) { |
| 2133 | zero_page = true; |
| 2134 | goto exit; |
| 2135 | } |
| 2136 | |
Xiao Guangrong | 6ef3771 | 2018-08-21 16:10:23 +0800 | [diff] [blame] | 2137 | save_page_header(rs, f, block, offset | RAM_SAVE_FLAG_COMPRESS_PAGE); |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 2138 | |
| 2139 | /* |
| 2140 | * copy it to a internal buffer to avoid it being modified by VM |
| 2141 | * so that we can catch up the error during compression and |
| 2142 | * decompression |
| 2143 | */ |
| 2144 | memcpy(source_buf, p, TARGET_PAGE_SIZE); |
Xiao Guangrong | 6ef3771 | 2018-08-21 16:10:23 +0800 | [diff] [blame] | 2145 | ret = qemu_put_compression_data(f, stream, source_buf, TARGET_PAGE_SIZE); |
| 2146 | if (ret < 0) { |
| 2147 | qemu_file_set_error(migrate_get_current()->to_dst_file, ret); |
Liang Li | b3be289 | 2016-05-05 15:32:54 +0800 | [diff] [blame] | 2148 | error_report("compressed data failed!"); |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2149 | return false; |
Liang Li | b3be289 | 2016-05-05 15:32:54 +0800 | [diff] [blame] | 2150 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2151 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2152 | exit: |
Xiao Guangrong | 6ef3771 | 2018-08-21 16:10:23 +0800 | [diff] [blame] | 2153 | ram_release_pages(block->idstr, offset & TARGET_PAGE_MASK, 1); |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2154 | return zero_page; |
| 2155 | } |
| 2156 | |
| 2157 | static void |
| 2158 | update_compress_thread_counts(const CompressParam *param, int bytes_xmit) |
| 2159 | { |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 2160 | ram_counters.transferred += bytes_xmit; |
| 2161 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2162 | if (param->zero_page) { |
| 2163 | ram_counters.duplicate++; |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 2164 | return; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2165 | } |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 2166 | |
| 2167 | /* 8 means a header with RAM_SAVE_FLAG_CONTINUE. */ |
| 2168 | compression_counters.compressed_size += bytes_xmit - 8; |
| 2169 | compression_counters.pages++; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2170 | } |
| 2171 | |
Xiao Guangrong | 32b0549 | 2018-09-06 15:01:01 +0800 | [diff] [blame] | 2172 | static bool save_page_use_compression(RAMState *rs); |
| 2173 | |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 2174 | static void flush_compressed_data(RAMState *rs) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2175 | { |
| 2176 | int idx, len, thread_count; |
| 2177 | |
Xiao Guangrong | 32b0549 | 2018-09-06 15:01:01 +0800 | [diff] [blame] | 2178 | if (!save_page_use_compression(rs)) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2179 | return; |
| 2180 | } |
| 2181 | thread_count = migrate_compress_threads(); |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2182 | |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 2183 | qemu_mutex_lock(&comp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2184 | for (idx = 0; idx < thread_count; idx++) { |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2185 | while (!comp_param[idx].done) { |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 2186 | qemu_cond_wait(&comp_done_cond, &comp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2187 | } |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2188 | } |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 2189 | qemu_mutex_unlock(&comp_done_lock); |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2190 | |
| 2191 | for (idx = 0; idx < thread_count; idx++) { |
| 2192 | qemu_mutex_lock(&comp_param[idx].mutex); |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 2193 | if (!comp_param[idx].quit) { |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 2194 | len = qemu_put_qemu_file(rs->f, comp_param[idx].file); |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2195 | /* |
| 2196 | * it's safe to fetch zero_page without holding comp_done_lock |
| 2197 | * as there is no further request submitted to the thread, |
| 2198 | * i.e, the thread should be waiting for a request at this point. |
| 2199 | */ |
| 2200 | update_compress_thread_counts(&comp_param[idx], len); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2201 | } |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2202 | qemu_mutex_unlock(&comp_param[idx].mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2203 | } |
| 2204 | } |
| 2205 | |
| 2206 | static inline void set_compress_params(CompressParam *param, RAMBlock *block, |
| 2207 | ram_addr_t offset) |
| 2208 | { |
| 2209 | param->block = block; |
| 2210 | param->offset = offset; |
| 2211 | } |
| 2212 | |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 2213 | static int compress_page_with_multi_thread(RAMState *rs, RAMBlock *block, |
| 2214 | ram_addr_t offset) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2215 | { |
| 2216 | int idx, thread_count, bytes_xmit = -1, pages = -1; |
Xiao Guangrong | 1d58872 | 2018-08-21 16:10:20 +0800 | [diff] [blame] | 2217 | bool wait = migrate_compress_wait_thread(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2218 | |
| 2219 | thread_count = migrate_compress_threads(); |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 2220 | qemu_mutex_lock(&comp_done_lock); |
Xiao Guangrong | 1d58872 | 2018-08-21 16:10:20 +0800 | [diff] [blame] | 2221 | retry: |
| 2222 | for (idx = 0; idx < thread_count; idx++) { |
| 2223 | if (comp_param[idx].done) { |
| 2224 | comp_param[idx].done = false; |
| 2225 | bytes_xmit = qemu_put_qemu_file(rs->f, comp_param[idx].file); |
| 2226 | qemu_mutex_lock(&comp_param[idx].mutex); |
| 2227 | set_compress_params(&comp_param[idx], block, offset); |
| 2228 | qemu_cond_signal(&comp_param[idx].cond); |
| 2229 | qemu_mutex_unlock(&comp_param[idx].mutex); |
| 2230 | pages = 1; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2231 | update_compress_thread_counts(&comp_param[idx], bytes_xmit); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2232 | break; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2233 | } |
| 2234 | } |
Xiao Guangrong | 1d58872 | 2018-08-21 16:10:20 +0800 | [diff] [blame] | 2235 | |
| 2236 | /* |
| 2237 | * wait for the free thread if the user specifies 'compress-wait-thread', |
| 2238 | * otherwise we will post the page out in the main thread as normal page. |
| 2239 | */ |
| 2240 | if (pages < 0 && wait) { |
| 2241 | qemu_cond_wait(&comp_done_cond, &comp_done_lock); |
| 2242 | goto retry; |
| 2243 | } |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 2244 | qemu_mutex_unlock(&comp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2245 | |
| 2246 | return pages; |
| 2247 | } |
| 2248 | |
| 2249 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2250 | * find_dirty_block: find the next dirty page and update any state |
| 2251 | * associated with the search process. |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2252 | * |
Wei Yang | a5f7b1a | 2019-05-11 07:37:29 +0800 | [diff] [blame] | 2253 | * Returns true if a page is found |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2254 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2255 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2256 | * @pss: data about the state of the current dirty page scan |
| 2257 | * @again: set to false if the search has scanned the whole of RAM |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2258 | */ |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2259 | static bool find_dirty_block(RAMState *rs, PageSearchStatus *pss, bool *again) |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2260 | { |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2261 | pss->page = migration_bitmap_find_dirty(rs, pss->block, pss->page); |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2262 | if (pss->complete_round && pss->block == rs->last_seen_block && |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2263 | pss->page >= rs->last_page) { |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2264 | /* |
| 2265 | * We've been once around the RAM and haven't found anything. |
| 2266 | * Give up. |
| 2267 | */ |
| 2268 | *again = false; |
| 2269 | return false; |
| 2270 | } |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2271 | if ((pss->page << TARGET_PAGE_BITS) >= pss->block->used_length) { |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2272 | /* Didn't find anything in this RAM Block */ |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2273 | pss->page = 0; |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2274 | pss->block = QLIST_NEXT_RCU(pss->block, next); |
| 2275 | if (!pss->block) { |
Xiao Guangrong | 48df9d8 | 2018-09-06 15:00:59 +0800 | [diff] [blame] | 2276 | /* |
| 2277 | * If memory migration starts over, we will meet a dirtied page |
| 2278 | * which may still exists in compression threads's ring, so we |
| 2279 | * should flush the compressed data to make sure the new page |
| 2280 | * is not overwritten by the old one in the destination. |
| 2281 | * |
| 2282 | * Also If xbzrle is on, stop using the data compression at this |
| 2283 | * point. In theory, xbzrle can do better than compression. |
| 2284 | */ |
| 2285 | flush_compressed_data(rs); |
| 2286 | |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2287 | /* Hit the end of the list */ |
| 2288 | pss->block = QLIST_FIRST_RCU(&ram_list.blocks); |
| 2289 | /* Flag that we've looped */ |
| 2290 | pss->complete_round = true; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2291 | rs->ram_bulk_stage = false; |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2292 | } |
| 2293 | /* Didn't find anything this time, but try again on the new block */ |
| 2294 | *again = true; |
| 2295 | return false; |
| 2296 | } else { |
| 2297 | /* Can go around again, but... */ |
| 2298 | *again = true; |
| 2299 | /* We've found something so probably don't need to */ |
| 2300 | return true; |
| 2301 | } |
| 2302 | } |
| 2303 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2304 | /** |
| 2305 | * unqueue_page: gets a page of the queue |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2306 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2307 | * Helper for 'get_queued_page' - gets a page off the queue |
| 2308 | * |
| 2309 | * Returns the block of the page (or NULL if none available) |
| 2310 | * |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2311 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2312 | * @offset: used to return the offset within the RAMBlock |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2313 | */ |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2314 | static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2315 | { |
| 2316 | RAMBlock *block = NULL; |
| 2317 | |
Xiao Guangrong | ae526e3 | 2018-08-21 16:10:25 +0800 | [diff] [blame] | 2318 | if (QSIMPLEQ_EMPTY_ATOMIC(&rs->src_page_requests)) { |
| 2319 | return NULL; |
| 2320 | } |
| 2321 | |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2322 | qemu_mutex_lock(&rs->src_page_req_mutex); |
| 2323 | if (!QSIMPLEQ_EMPTY(&rs->src_page_requests)) { |
| 2324 | struct RAMSrcPageRequest *entry = |
| 2325 | QSIMPLEQ_FIRST(&rs->src_page_requests); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2326 | block = entry->rb; |
| 2327 | *offset = entry->offset; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2328 | |
| 2329 | if (entry->len > TARGET_PAGE_SIZE) { |
| 2330 | entry->len -= TARGET_PAGE_SIZE; |
| 2331 | entry->offset += TARGET_PAGE_SIZE; |
| 2332 | } else { |
| 2333 | memory_region_unref(block->mr); |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2334 | QSIMPLEQ_REMOVE_HEAD(&rs->src_page_requests, next_req); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2335 | g_free(entry); |
Dr. David Alan Gilbert | e03a34f | 2018-06-13 11:26:42 +0100 | [diff] [blame] | 2336 | migration_consume_urgent_request(); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2337 | } |
| 2338 | } |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2339 | qemu_mutex_unlock(&rs->src_page_req_mutex); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2340 | |
| 2341 | return block; |
| 2342 | } |
| 2343 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2344 | /** |
Li Qiang | ff1543a | 2019-05-24 23:28:32 -0700 | [diff] [blame] | 2345 | * get_queued_page: unqueue a page from the postcopy requests |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2346 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2347 | * Skips pages that are already sent (!dirty) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2348 | * |
Wei Yang | a5f7b1a | 2019-05-11 07:37:29 +0800 | [diff] [blame] | 2349 | * Returns true if a queued page is found |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2350 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2351 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2352 | * @pss: data about the state of the current dirty page scan |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2353 | */ |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2354 | static bool get_queued_page(RAMState *rs, PageSearchStatus *pss) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2355 | { |
| 2356 | RAMBlock *block; |
| 2357 | ram_addr_t offset; |
| 2358 | bool dirty; |
| 2359 | |
| 2360 | do { |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2361 | block = unqueue_page(rs, &offset); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2362 | /* |
| 2363 | * We're sending this page, and since it's postcopy nothing else |
| 2364 | * will dirty it, and we must make sure it doesn't get sent again |
| 2365 | * even if this queue request was received after the background |
| 2366 | * search already sent it. |
| 2367 | */ |
| 2368 | if (block) { |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2369 | unsigned long page; |
| 2370 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2371 | page = offset >> TARGET_PAGE_BITS; |
| 2372 | dirty = test_bit(page, block->bmap); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2373 | if (!dirty) { |
Juan Quintela | 06b1068 | 2017-03-21 15:18:05 +0100 | [diff] [blame] | 2374 | trace_get_queued_page_not_dirty(block->idstr, (uint64_t)offset, |
Wei Yang | 6473760 | 2019-08-19 14:18:43 +0800 | [diff] [blame] | 2375 | page); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2376 | } else { |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2377 | trace_get_queued_page(block->idstr, (uint64_t)offset, page); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2378 | } |
| 2379 | } |
| 2380 | |
| 2381 | } while (block && !dirty); |
| 2382 | |
| 2383 | if (block) { |
| 2384 | /* |
| 2385 | * As soon as we start servicing pages out of order, then we have |
| 2386 | * to kill the bulk stage, since the bulk stage assumes |
| 2387 | * in (migration_bitmap_find_and_reset_dirty) that every page is |
| 2388 | * dirty, that's no longer true. |
| 2389 | */ |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2390 | rs->ram_bulk_stage = false; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2391 | |
| 2392 | /* |
| 2393 | * We want the background search to continue from the queued page |
| 2394 | * since the guest is likely to want other pages near to the page |
| 2395 | * it just requested. |
| 2396 | */ |
| 2397 | pss->block = block; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2398 | pss->page = offset >> TARGET_PAGE_BITS; |
Wei Yang | 422314e | 2019-06-05 09:08:28 +0800 | [diff] [blame] | 2399 | |
| 2400 | /* |
| 2401 | * This unqueued page would break the "one round" check, even is |
| 2402 | * really rare. |
| 2403 | */ |
| 2404 | pss->complete_round = false; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2405 | } |
| 2406 | |
| 2407 | return !!block; |
| 2408 | } |
| 2409 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2410 | /** |
Juan Quintela | 5e58f96 | 2017-04-03 22:06:54 +0200 | [diff] [blame] | 2411 | * migration_page_queue_free: drop any remaining pages in the ram |
| 2412 | * request queue |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2413 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2414 | * It should be empty at the end anyway, but in error cases there may |
| 2415 | * be some left. in case that there is any page left, we drop it. |
| 2416 | * |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2417 | */ |
Juan Quintela | 83c1338 | 2017-05-04 11:45:01 +0200 | [diff] [blame] | 2418 | static void migration_page_queue_free(RAMState *rs) |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2419 | { |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2420 | struct RAMSrcPageRequest *mspr, *next_mspr; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2421 | /* This queue generally should be empty - but in the case of a failed |
| 2422 | * migration might have some droppings in. |
| 2423 | */ |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 2424 | RCU_READ_LOCK_GUARD(); |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2425 | QSIMPLEQ_FOREACH_SAFE(mspr, &rs->src_page_requests, next_req, next_mspr) { |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2426 | memory_region_unref(mspr->rb->mr); |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2427 | QSIMPLEQ_REMOVE_HEAD(&rs->src_page_requests, next_req); |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2428 | g_free(mspr); |
| 2429 | } |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2430 | } |
| 2431 | |
| 2432 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2433 | * ram_save_queue_pages: queue the page for transmission |
| 2434 | * |
| 2435 | * A request from postcopy destination for example. |
| 2436 | * |
| 2437 | * Returns zero on success or negative on error |
| 2438 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2439 | * @rbname: Name of the RAMBLock of the request. NULL means the |
| 2440 | * same that last one. |
| 2441 | * @start: starting address from the start of the RAMBlock |
| 2442 | * @len: length (in bytes) to send |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2443 | */ |
Juan Quintela | 9650689 | 2017-03-14 18:41:03 +0100 | [diff] [blame] | 2444 | int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len) |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2445 | { |
| 2446 | RAMBlock *ramblock; |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 2447 | RAMState *rs = ram_state; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2448 | |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 2449 | ram_counters.postcopy_requests++; |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 2450 | RCU_READ_LOCK_GUARD(); |
| 2451 | |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2452 | if (!rbname) { |
| 2453 | /* Reuse last RAMBlock */ |
Juan Quintela | 68a098f | 2017-03-14 13:48:42 +0100 | [diff] [blame] | 2454 | ramblock = rs->last_req_rb; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2455 | |
| 2456 | if (!ramblock) { |
| 2457 | /* |
| 2458 | * Shouldn't happen, we can't reuse the last RAMBlock if |
| 2459 | * it's the 1st request. |
| 2460 | */ |
| 2461 | error_report("ram_save_queue_pages no previous block"); |
Daniel Henrique Barboza | 03acb4e | 2020-01-06 15:23:31 -0300 | [diff] [blame] | 2462 | return -1; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2463 | } |
| 2464 | } else { |
| 2465 | ramblock = qemu_ram_block_by_name(rbname); |
| 2466 | |
| 2467 | if (!ramblock) { |
| 2468 | /* We shouldn't be asked for a non-existent RAMBlock */ |
| 2469 | error_report("ram_save_queue_pages no block '%s'", rbname); |
Daniel Henrique Barboza | 03acb4e | 2020-01-06 15:23:31 -0300 | [diff] [blame] | 2470 | return -1; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2471 | } |
Juan Quintela | 68a098f | 2017-03-14 13:48:42 +0100 | [diff] [blame] | 2472 | rs->last_req_rb = ramblock; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2473 | } |
| 2474 | trace_ram_save_queue_pages(ramblock->idstr, start, len); |
| 2475 | if (start+len > ramblock->used_length) { |
Juan Quintela | 9458ad6 | 2015-11-10 17:42:05 +0100 | [diff] [blame] | 2476 | error_report("%s request overrun start=" RAM_ADDR_FMT " len=" |
| 2477 | RAM_ADDR_FMT " blocklen=" RAM_ADDR_FMT, |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2478 | __func__, start, len, ramblock->used_length); |
Daniel Henrique Barboza | 03acb4e | 2020-01-06 15:23:31 -0300 | [diff] [blame] | 2479 | return -1; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2480 | } |
| 2481 | |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2482 | struct RAMSrcPageRequest *new_entry = |
| 2483 | g_malloc0(sizeof(struct RAMSrcPageRequest)); |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2484 | new_entry->rb = ramblock; |
| 2485 | new_entry->offset = start; |
| 2486 | new_entry->len = len; |
| 2487 | |
| 2488 | memory_region_ref(ramblock->mr); |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2489 | qemu_mutex_lock(&rs->src_page_req_mutex); |
| 2490 | QSIMPLEQ_INSERT_TAIL(&rs->src_page_requests, new_entry, next_req); |
Dr. David Alan Gilbert | e03a34f | 2018-06-13 11:26:42 +0100 | [diff] [blame] | 2491 | migration_make_urgent_request(); |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2492 | qemu_mutex_unlock(&rs->src_page_req_mutex); |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2493 | |
| 2494 | return 0; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2495 | } |
| 2496 | |
Xiao Guangrong | d7400a3 | 2018-03-30 15:51:26 +0800 | [diff] [blame] | 2497 | static bool save_page_use_compression(RAMState *rs) |
| 2498 | { |
| 2499 | if (!migrate_use_compression()) { |
| 2500 | return false; |
| 2501 | } |
| 2502 | |
| 2503 | /* |
| 2504 | * If xbzrle is on, stop using the data compression after first |
| 2505 | * round of migration even if compression is enabled. In theory, |
| 2506 | * xbzrle can do better than compression. |
| 2507 | */ |
| 2508 | if (rs->ram_bulk_stage || !migrate_use_xbzrle()) { |
| 2509 | return true; |
| 2510 | } |
| 2511 | |
| 2512 | return false; |
| 2513 | } |
| 2514 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2515 | /* |
| 2516 | * try to compress the page before posting it out, return true if the page |
| 2517 | * has been properly handled by compression, otherwise needs other |
| 2518 | * paths to handle it |
| 2519 | */ |
| 2520 | static bool save_compress_page(RAMState *rs, RAMBlock *block, ram_addr_t offset) |
| 2521 | { |
| 2522 | if (!save_page_use_compression(rs)) { |
| 2523 | return false; |
| 2524 | } |
| 2525 | |
| 2526 | /* |
| 2527 | * When starting the process of a new block, the first page of |
| 2528 | * the block should be sent out before other pages in the same |
| 2529 | * block, and all the pages in last block should have been sent |
| 2530 | * out, keeping this order is important, because the 'cont' flag |
| 2531 | * is used to avoid resending the block name. |
| 2532 | * |
| 2533 | * We post the fist page as normal page as compression will take |
| 2534 | * much CPU resource. |
| 2535 | */ |
| 2536 | if (block != rs->last_sent_block) { |
| 2537 | flush_compressed_data(rs); |
| 2538 | return false; |
| 2539 | } |
| 2540 | |
| 2541 | if (compress_page_with_multi_thread(rs, block, offset) > 0) { |
| 2542 | return true; |
| 2543 | } |
| 2544 | |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 2545 | compression_counters.busy++; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2546 | return false; |
| 2547 | } |
| 2548 | |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2549 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2550 | * ram_save_target_page: save one target page |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2551 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2552 | * Returns the number of pages written |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2553 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2554 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2555 | * @pss: data about the page we want to send |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2556 | * @last_stage: if we are at the completion stage |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2557 | */ |
Juan Quintela | a0a8aa1 | 2017-03-20 22:29:07 +0100 | [diff] [blame] | 2558 | static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss, |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2559 | bool last_stage) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2560 | { |
Xiao Guangrong | a8ec91f | 2018-03-30 15:51:25 +0800 | [diff] [blame] | 2561 | RAMBlock *block = pss->block; |
| 2562 | ram_addr_t offset = pss->page << TARGET_PAGE_BITS; |
| 2563 | int res; |
| 2564 | |
| 2565 | if (control_save_page(rs, block, offset, &res)) { |
| 2566 | return res; |
| 2567 | } |
| 2568 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2569 | if (save_compress_page(rs, block, offset)) { |
| 2570 | return 1; |
Xiao Guangrong | d7400a3 | 2018-03-30 15:51:26 +0800 | [diff] [blame] | 2571 | } |
| 2572 | |
| 2573 | res = save_zero_page(rs, block, offset); |
| 2574 | if (res > 0) { |
| 2575 | /* Must let xbzrle know, otherwise a previous (now 0'd) cached |
| 2576 | * page would be stale |
| 2577 | */ |
| 2578 | if (!save_page_use_compression(rs)) { |
| 2579 | XBZRLE_cache_lock(); |
| 2580 | xbzrle_cache_zero_page(rs, block->offset + offset); |
| 2581 | XBZRLE_cache_unlock(); |
| 2582 | } |
| 2583 | ram_release_pages(block->idstr, offset, res); |
| 2584 | return res; |
| 2585 | } |
| 2586 | |
Xiao Guangrong | da3f56c | 2018-03-30 15:51:28 +0800 | [diff] [blame] | 2587 | /* |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2588 | * do not use multifd for compression as the first page in the new |
| 2589 | * block should be posted out before sending the compressed page |
Xiao Guangrong | da3f56c | 2018-03-30 15:51:28 +0800 | [diff] [blame] | 2590 | */ |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2591 | if (!save_page_use_compression(rs) && migrate_use_multifd()) { |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 2592 | return ram_save_multifd_page(rs, block, offset); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2593 | } |
| 2594 | |
Xiao Guangrong | 1faa566 | 2018-03-30 15:51:24 +0800 | [diff] [blame] | 2595 | return ram_save_page(rs, pss, last_stage); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2596 | } |
| 2597 | |
| 2598 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2599 | * ram_save_host_page: save a whole host page |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2600 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2601 | * Starting at *offset send pages up to the end of the current host |
| 2602 | * page. It's valid for the initial offset to point into the middle of |
| 2603 | * a host page in which case the remainder of the hostpage is sent. |
| 2604 | * Only dirty target pages are sent. Note that the host page size may |
| 2605 | * be a huge page for this block. |
Dr. David Alan Gilbert | 1eb3fc0 | 2017-05-17 17:58:09 +0100 | [diff] [blame] | 2606 | * The saving stops at the boundary of the used_length of the block |
| 2607 | * if the RAMBlock isn't a multiple of the host page size. |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2608 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2609 | * Returns the number of pages written or negative on error |
| 2610 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2611 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2612 | * @ms: current migration state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2613 | * @pss: data about the page we want to send |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2614 | * @last_stage: if we are at the completion stage |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2615 | */ |
Juan Quintela | a0a8aa1 | 2017-03-20 22:29:07 +0100 | [diff] [blame] | 2616 | static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss, |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2617 | bool last_stage) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2618 | { |
| 2619 | int tmppages, pages = 0; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2620 | size_t pagesize_bits = |
| 2621 | qemu_ram_pagesize(pss->block) >> TARGET_PAGE_BITS; |
Dr. David Alan Gilbert | 4c011c3 | 2017-02-24 18:28:39 +0000 | [diff] [blame] | 2622 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2623 | if (ramblock_is_ignored(pss->block)) { |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 2624 | error_report("block %s should not be migrated !", pss->block->idstr); |
| 2625 | return 0; |
| 2626 | } |
| 2627 | |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2628 | do { |
Xiao Guangrong | 1faa566 | 2018-03-30 15:51:24 +0800 | [diff] [blame] | 2629 | /* Check the pages is dirty and if it is send it */ |
| 2630 | if (!migration_bitmap_clear_dirty(rs, pss->block, pss->page)) { |
| 2631 | pss->page++; |
| 2632 | continue; |
| 2633 | } |
| 2634 | |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2635 | tmppages = ram_save_target_page(rs, pss, last_stage); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2636 | if (tmppages < 0) { |
| 2637 | return tmppages; |
| 2638 | } |
| 2639 | |
| 2640 | pages += tmppages; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2641 | pss->page++; |
Dr. David Alan Gilbert | 97e1e06 | 2019-12-05 10:29:18 +0000 | [diff] [blame] | 2642 | /* Allow rate limiting to happen in the middle of huge pages */ |
| 2643 | migration_rate_limit(); |
Dr. David Alan Gilbert | 1eb3fc0 | 2017-05-17 17:58:09 +0100 | [diff] [blame] | 2644 | } while ((pss->page & (pagesize_bits - 1)) && |
| 2645 | offset_in_ramblock(pss->block, pss->page << TARGET_PAGE_BITS)); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2646 | |
| 2647 | /* The offset we leave with is the last one we looked at */ |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2648 | pss->page--; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2649 | return pages; |
| 2650 | } |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2651 | |
| 2652 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2653 | * ram_find_and_save_block: finds a dirty page and sends it to f |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2654 | * |
| 2655 | * Called within an RCU critical section. |
| 2656 | * |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 2657 | * Returns the number of pages written where zero means no dirty pages, |
| 2658 | * or negative on error |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2659 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2660 | * @rs: current RAM state |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2661 | * @last_stage: if we are at the completion stage |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2662 | * |
| 2663 | * On systems where host-page-size > target-page-size it will send all the |
| 2664 | * pages in a host page that are dirty. |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2665 | */ |
| 2666 | |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 2667 | static int ram_find_and_save_block(RAMState *rs, bool last_stage) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2668 | { |
Dr. David Alan Gilbert | b8fb8cb | 2015-09-23 15:27:10 +0100 | [diff] [blame] | 2669 | PageSearchStatus pss; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2670 | int pages = 0; |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2671 | bool again, found; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2672 | |
Ashijeet Acharya | 0827b9e | 2017-02-08 19:58:45 +0530 | [diff] [blame] | 2673 | /* No dirty page as there is zero RAM */ |
| 2674 | if (!ram_bytes_total()) { |
| 2675 | return pages; |
| 2676 | } |
| 2677 | |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2678 | pss.block = rs->last_seen_block; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2679 | pss.page = rs->last_page; |
Dr. David Alan Gilbert | b8fb8cb | 2015-09-23 15:27:10 +0100 | [diff] [blame] | 2680 | pss.complete_round = false; |
| 2681 | |
| 2682 | if (!pss.block) { |
| 2683 | pss.block = QLIST_FIRST_RCU(&ram_list.blocks); |
| 2684 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2685 | |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2686 | do { |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2687 | again = true; |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2688 | found = get_queued_page(rs, &pss); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2689 | |
| 2690 | if (!found) { |
| 2691 | /* priority queue empty, so just search for something dirty */ |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2692 | found = find_dirty_block(rs, &pss, &again); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2693 | } |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2694 | |
| 2695 | if (found) { |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2696 | pages = ram_save_host_page(rs, &pss, last_stage); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2697 | } |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2698 | } while (!pages && again); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2699 | |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2700 | rs->last_seen_block = pss.block; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2701 | rs->last_page = pss.page; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2702 | |
| 2703 | return pages; |
| 2704 | } |
| 2705 | |
| 2706 | void acct_update_position(QEMUFile *f, size_t size, bool zero) |
| 2707 | { |
| 2708 | uint64_t pages = size / TARGET_PAGE_SIZE; |
Juan Quintela | f7ccd61 | 2017-03-13 20:30:21 +0100 | [diff] [blame] | 2709 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2710 | if (zero) { |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 2711 | ram_counters.duplicate += pages; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2712 | } else { |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 2713 | ram_counters.normal += pages; |
| 2714 | ram_counters.transferred += size; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2715 | qemu_update_position(f, size); |
| 2716 | } |
| 2717 | } |
| 2718 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2719 | static uint64_t ram_bytes_total_common(bool count_ignored) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2720 | { |
| 2721 | RAMBlock *block; |
| 2722 | uint64_t total = 0; |
| 2723 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 2724 | RCU_READ_LOCK_GUARD(); |
| 2725 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2726 | if (count_ignored) { |
| 2727 | RAMBLOCK_FOREACH_MIGRATABLE(block) { |
| 2728 | total += block->used_length; |
| 2729 | } |
| 2730 | } else { |
| 2731 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
| 2732 | total += block->used_length; |
| 2733 | } |
Peter Xu | 99e1558 | 2017-05-12 12:17:39 +0800 | [diff] [blame] | 2734 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2735 | return total; |
| 2736 | } |
| 2737 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2738 | uint64_t ram_bytes_total(void) |
| 2739 | { |
| 2740 | return ram_bytes_total_common(false); |
| 2741 | } |
| 2742 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 2743 | static void xbzrle_load_setup(void) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2744 | { |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 2745 | XBZRLE.decoded_buf = g_malloc(TARGET_PAGE_SIZE); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2746 | } |
| 2747 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 2748 | static void xbzrle_load_cleanup(void) |
| 2749 | { |
| 2750 | g_free(XBZRLE.decoded_buf); |
| 2751 | XBZRLE.decoded_buf = NULL; |
| 2752 | } |
| 2753 | |
Peter Xu | 7d7c96b | 2017-10-19 14:31:58 +0800 | [diff] [blame] | 2754 | static void ram_state_cleanup(RAMState **rsp) |
| 2755 | { |
Dr. David Alan Gilbert | b9ccaf6 | 2018-02-12 16:03:39 +0000 | [diff] [blame] | 2756 | if (*rsp) { |
| 2757 | migration_page_queue_free(*rsp); |
| 2758 | qemu_mutex_destroy(&(*rsp)->bitmap_mutex); |
| 2759 | qemu_mutex_destroy(&(*rsp)->src_page_req_mutex); |
| 2760 | g_free(*rsp); |
| 2761 | *rsp = NULL; |
| 2762 | } |
Peter Xu | 7d7c96b | 2017-10-19 14:31:58 +0800 | [diff] [blame] | 2763 | } |
| 2764 | |
Peter Xu | 84593a0 | 2017-10-19 14:31:59 +0800 | [diff] [blame] | 2765 | static void xbzrle_cleanup(void) |
| 2766 | { |
| 2767 | XBZRLE_cache_lock(); |
| 2768 | if (XBZRLE.cache) { |
| 2769 | cache_fini(XBZRLE.cache); |
| 2770 | g_free(XBZRLE.encoded_buf); |
| 2771 | g_free(XBZRLE.current_buf); |
| 2772 | g_free(XBZRLE.zero_target_page); |
| 2773 | XBZRLE.cache = NULL; |
| 2774 | XBZRLE.encoded_buf = NULL; |
| 2775 | XBZRLE.current_buf = NULL; |
| 2776 | XBZRLE.zero_target_page = NULL; |
| 2777 | } |
| 2778 | XBZRLE_cache_unlock(); |
| 2779 | } |
| 2780 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 2781 | static void ram_save_cleanup(void *opaque) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2782 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 2783 | RAMState **rsp = opaque; |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2784 | RAMBlock *block; |
Juan Quintela | eb859c5 | 2017-03-13 21:51:55 +0100 | [diff] [blame] | 2785 | |
Li Zhijian | 2ff6403 | 2015-07-02 20:18:05 +0800 | [diff] [blame] | 2786 | /* caller have hold iothread lock or is in a bh, so there is |
Yi Wang | 4633456 | 2019-04-15 14:51:29 +0800 | [diff] [blame] | 2787 | * no writing race against the migration bitmap |
Li Zhijian | 2ff6403 | 2015-07-02 20:18:05 +0800 | [diff] [blame] | 2788 | */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2789 | memory_global_dirty_log_stop(); |
| 2790 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2791 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Peter Xu | 002cad6 | 2019-06-03 14:50:56 +0800 | [diff] [blame] | 2792 | g_free(block->clear_bmap); |
| 2793 | block->clear_bmap = NULL; |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2794 | g_free(block->bmap); |
| 2795 | block->bmap = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2796 | } |
| 2797 | |
Peter Xu | 84593a0 | 2017-10-19 14:31:59 +0800 | [diff] [blame] | 2798 | xbzrle_cleanup(); |
Juan Quintela | f0afa33 | 2017-06-28 11:52:28 +0200 | [diff] [blame] | 2799 | compress_threads_save_cleanup(); |
Peter Xu | 7d7c96b | 2017-10-19 14:31:58 +0800 | [diff] [blame] | 2800 | ram_state_cleanup(rsp); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2801 | } |
| 2802 | |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2803 | static void ram_state_reset(RAMState *rs) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2804 | { |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2805 | rs->last_seen_block = NULL; |
| 2806 | rs->last_sent_block = NULL; |
Juan Quintela | 269ace2 | 2017-03-21 15:23:31 +0100 | [diff] [blame] | 2807 | rs->last_page = 0; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2808 | rs->last_version = ram_list.version; |
| 2809 | rs->ram_bulk_stage = true; |
Wei Wang | 6eeb63f | 2018-12-11 16:24:52 +0800 | [diff] [blame] | 2810 | rs->fpo_enabled = false; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2811 | } |
| 2812 | |
| 2813 | #define MAX_WAIT 50 /* ms, half buffered_file limit */ |
| 2814 | |
Dr. David Alan Gilbert | 4f2e425 | 2015-11-05 18:10:38 +0000 | [diff] [blame] | 2815 | /* |
| 2816 | * 'expected' is the value you expect the bitmap mostly to be full |
| 2817 | * of; it won't bother printing lines that are all this value. |
| 2818 | * If 'todump' is null the migration bitmap is dumped. |
| 2819 | */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2820 | void ram_debug_dump_bitmap(unsigned long *todump, bool expected, |
| 2821 | unsigned long pages) |
Dr. David Alan Gilbert | 4f2e425 | 2015-11-05 18:10:38 +0000 | [diff] [blame] | 2822 | { |
Dr. David Alan Gilbert | 4f2e425 | 2015-11-05 18:10:38 +0000 | [diff] [blame] | 2823 | int64_t cur; |
| 2824 | int64_t linelen = 128; |
| 2825 | char linebuf[129]; |
| 2826 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2827 | for (cur = 0; cur < pages; cur += linelen) { |
Dr. David Alan Gilbert | 4f2e425 | 2015-11-05 18:10:38 +0000 | [diff] [blame] | 2828 | int64_t curb; |
| 2829 | bool found = false; |
| 2830 | /* |
| 2831 | * Last line; catch the case where the line length |
| 2832 | * is longer than remaining ram |
| 2833 | */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2834 | if (cur + linelen > pages) { |
| 2835 | linelen = pages - cur; |
Dr. David Alan Gilbert | 4f2e425 | 2015-11-05 18:10:38 +0000 | [diff] [blame] | 2836 | } |
| 2837 | for (curb = 0; curb < linelen; curb++) { |
| 2838 | bool thisbit = test_bit(cur + curb, todump); |
| 2839 | linebuf[curb] = thisbit ? '1' : '.'; |
| 2840 | found = found || (thisbit != expected); |
| 2841 | } |
| 2842 | if (found) { |
| 2843 | linebuf[curb] = '\0'; |
| 2844 | fprintf(stderr, "0x%08" PRIx64 " : %s\n", cur, linebuf); |
| 2845 | } |
| 2846 | } |
| 2847 | } |
| 2848 | |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2849 | /* **** functions for postcopy ***** */ |
| 2850 | |
Pavel Butsykin | ced1c61 | 2017-02-03 18:23:21 +0300 | [diff] [blame] | 2851 | void ram_postcopy_migrated_memory_release(MigrationState *ms) |
| 2852 | { |
| 2853 | struct RAMBlock *block; |
Pavel Butsykin | ced1c61 | 2017-02-03 18:23:21 +0300 | [diff] [blame] | 2854 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2855 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2856 | unsigned long *bitmap = block->bmap; |
| 2857 | unsigned long range = block->used_length >> TARGET_PAGE_BITS; |
| 2858 | unsigned long run_start = find_next_zero_bit(bitmap, range, 0); |
Pavel Butsykin | ced1c61 | 2017-02-03 18:23:21 +0300 | [diff] [blame] | 2859 | |
| 2860 | while (run_start < range) { |
| 2861 | unsigned long run_end = find_next_bit(bitmap, range, run_start + 1); |
Juan Quintela | aaa2064 | 2017-03-21 11:35:24 +0100 | [diff] [blame] | 2862 | ram_discard_range(block->idstr, run_start << TARGET_PAGE_BITS, |
Pavel Butsykin | ced1c61 | 2017-02-03 18:23:21 +0300 | [diff] [blame] | 2863 | (run_end - run_start) << TARGET_PAGE_BITS); |
| 2864 | run_start = find_next_zero_bit(bitmap, range, run_end + 1); |
| 2865 | } |
| 2866 | } |
| 2867 | } |
| 2868 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2869 | /** |
| 2870 | * postcopy_send_discard_bm_ram: discard a RAMBlock |
| 2871 | * |
| 2872 | * Returns zero on success |
| 2873 | * |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2874 | * Callback from postcopy_each_ram_send_discard for each RAMBlock |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2875 | * |
| 2876 | * @ms: current migration state |
Wei Yang | 89dab31 | 2019-07-15 10:05:49 +0800 | [diff] [blame] | 2877 | * @block: RAMBlock to discard |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2878 | */ |
Wei Yang | 810cf2b | 2019-07-24 09:07:21 +0800 | [diff] [blame] | 2879 | static int postcopy_send_discard_bm_ram(MigrationState *ms, RAMBlock *block) |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2880 | { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2881 | unsigned long end = block->used_length >> TARGET_PAGE_BITS; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2882 | unsigned long current; |
Wei Yang | 1e7cf8c | 2019-08-19 14:18:42 +0800 | [diff] [blame] | 2883 | unsigned long *bitmap = block->bmap; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2884 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2885 | for (current = 0; current < end; ) { |
Wei Yang | 1e7cf8c | 2019-08-19 14:18:42 +0800 | [diff] [blame] | 2886 | unsigned long one = find_next_bit(bitmap, end, current); |
Wei Yang | 33a5cb62 | 2019-06-27 10:08:21 +0800 | [diff] [blame] | 2887 | unsigned long zero, discard_length; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2888 | |
Wei Yang | 33a5cb62 | 2019-06-27 10:08:21 +0800 | [diff] [blame] | 2889 | if (one >= end) { |
| 2890 | break; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2891 | } |
Wei Yang | 33a5cb62 | 2019-06-27 10:08:21 +0800 | [diff] [blame] | 2892 | |
Wei Yang | 1e7cf8c | 2019-08-19 14:18:42 +0800 | [diff] [blame] | 2893 | zero = find_next_zero_bit(bitmap, end, one + 1); |
Wei Yang | 33a5cb62 | 2019-06-27 10:08:21 +0800 | [diff] [blame] | 2894 | |
| 2895 | if (zero >= end) { |
| 2896 | discard_length = end - one; |
| 2897 | } else { |
| 2898 | discard_length = zero - one; |
| 2899 | } |
Wei Yang | 810cf2b | 2019-07-24 09:07:21 +0800 | [diff] [blame] | 2900 | postcopy_discard_send_range(ms, one, discard_length); |
Wei Yang | 33a5cb62 | 2019-06-27 10:08:21 +0800 | [diff] [blame] | 2901 | current = one + discard_length; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2902 | } |
| 2903 | |
| 2904 | return 0; |
| 2905 | } |
| 2906 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2907 | /** |
| 2908 | * postcopy_each_ram_send_discard: discard all RAMBlocks |
| 2909 | * |
| 2910 | * Returns 0 for success or negative for error |
| 2911 | * |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2912 | * Utility for the outgoing postcopy code. |
| 2913 | * Calls postcopy_send_discard_bm_ram for each RAMBlock |
| 2914 | * passing it bitmap indexes and name. |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2915 | * (qemu_ram_foreach_block ends up passing unscaled lengths |
| 2916 | * which would mean postcopy code would have to deal with target page) |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2917 | * |
| 2918 | * @ms: current migration state |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2919 | */ |
| 2920 | static int postcopy_each_ram_send_discard(MigrationState *ms) |
| 2921 | { |
| 2922 | struct RAMBlock *block; |
| 2923 | int ret; |
| 2924 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2925 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Wei Yang | 810cf2b | 2019-07-24 09:07:21 +0800 | [diff] [blame] | 2926 | postcopy_discard_send_init(ms, block->idstr); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2927 | |
| 2928 | /* |
| 2929 | * Postcopy sends chunks of bitmap over the wire, but it |
| 2930 | * just needs indexes at this point, avoids it having |
| 2931 | * target page specific code. |
| 2932 | */ |
Wei Yang | 810cf2b | 2019-07-24 09:07:21 +0800 | [diff] [blame] | 2933 | ret = postcopy_send_discard_bm_ram(ms, block); |
| 2934 | postcopy_discard_send_finish(ms); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2935 | if (ret) { |
| 2936 | return ret; |
| 2937 | } |
| 2938 | } |
| 2939 | |
| 2940 | return 0; |
| 2941 | } |
| 2942 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2943 | /** |
Wei Yang | 8324ef8 | 2019-08-19 14:18:41 +0800 | [diff] [blame] | 2944 | * postcopy_chunk_hostpages_pass: canonicalize bitmap in hostpages |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2945 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2946 | * Helper for postcopy_chunk_hostpages; it's called twice to |
| 2947 | * canonicalize the two bitmaps, that are similar, but one is |
| 2948 | * inverted. |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2949 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2950 | * Postcopy requires that all target pages in a hostpage are dirty or |
| 2951 | * clean, not a mix. This function canonicalizes the bitmaps. |
| 2952 | * |
| 2953 | * @ms: current migration state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2954 | * @block: block that contains the page we want to canonicalize |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2955 | */ |
Wei Yang | 1e7cf8c | 2019-08-19 14:18:42 +0800 | [diff] [blame] | 2956 | static void postcopy_chunk_hostpages_pass(MigrationState *ms, RAMBlock *block) |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2957 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 2958 | RAMState *rs = ram_state; |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2959 | unsigned long *bitmap = block->bmap; |
Dr. David Alan Gilbert | 29c5917 | 2017-02-24 18:28:31 +0000 | [diff] [blame] | 2960 | unsigned int host_ratio = block->page_size / TARGET_PAGE_SIZE; |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2961 | unsigned long pages = block->used_length >> TARGET_PAGE_BITS; |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2962 | unsigned long run_start; |
| 2963 | |
Dr. David Alan Gilbert | 29c5917 | 2017-02-24 18:28:31 +0000 | [diff] [blame] | 2964 | if (block->page_size == TARGET_PAGE_SIZE) { |
| 2965 | /* Easy case - TPS==HPS for a non-huge page RAMBlock */ |
| 2966 | return; |
| 2967 | } |
| 2968 | |
Wei Yang | 1e7cf8c | 2019-08-19 14:18:42 +0800 | [diff] [blame] | 2969 | /* Find a dirty page */ |
| 2970 | run_start = find_next_bit(bitmap, pages, 0); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2971 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2972 | while (run_start < pages) { |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2973 | |
| 2974 | /* |
| 2975 | * If the start of this run of pages is in the middle of a host |
| 2976 | * page, then we need to fixup this host page. |
| 2977 | */ |
Wei Yang | 9dec3cc | 2019-08-06 08:46:48 +0800 | [diff] [blame] | 2978 | if (QEMU_IS_ALIGNED(run_start, host_ratio)) { |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2979 | /* Find the end of this run */ |
Wei Yang | 1e7cf8c | 2019-08-19 14:18:42 +0800 | [diff] [blame] | 2980 | run_start = find_next_zero_bit(bitmap, pages, run_start + 1); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2981 | /* |
| 2982 | * If the end isn't at the start of a host page, then the |
| 2983 | * run doesn't finish at the end of a host page |
| 2984 | * and we need to discard. |
| 2985 | */ |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2986 | } |
| 2987 | |
Wei Yang | 9dec3cc | 2019-08-06 08:46:48 +0800 | [diff] [blame] | 2988 | if (!QEMU_IS_ALIGNED(run_start, host_ratio)) { |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2989 | unsigned long page; |
Wei Yang | dad45ab | 2019-08-06 08:46:47 +0800 | [diff] [blame] | 2990 | unsigned long fixup_start_addr = QEMU_ALIGN_DOWN(run_start, |
| 2991 | host_ratio); |
| 2992 | run_start = QEMU_ALIGN_UP(run_start, host_ratio); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2993 | |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2994 | /* Clean up the bitmap */ |
| 2995 | for (page = fixup_start_addr; |
| 2996 | page < fixup_start_addr + host_ratio; page++) { |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2997 | /* |
| 2998 | * Remark them as dirty, updating the count for any pages |
| 2999 | * that weren't previously dirty. |
| 3000 | */ |
Juan Quintela | 0d8ec88 | 2017-03-13 21:21:41 +0100 | [diff] [blame] | 3001 | rs->migration_dirty_pages += !test_and_set_bit(page, bitmap); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 3002 | } |
| 3003 | } |
| 3004 | |
Wei Yang | 1e7cf8c | 2019-08-19 14:18:42 +0800 | [diff] [blame] | 3005 | /* Find the next dirty page for the next iteration */ |
| 3006 | run_start = find_next_bit(bitmap, pages, run_start); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 3007 | } |
| 3008 | } |
| 3009 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3010 | /** |
Wei Yang | 89dab31 | 2019-07-15 10:05:49 +0800 | [diff] [blame] | 3011 | * postcopy_chunk_hostpages: discard any partially sent host page |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3012 | * |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 3013 | * Utility for the outgoing postcopy code. |
| 3014 | * |
| 3015 | * Discard any partially sent host-page size chunks, mark any partially |
Dr. David Alan Gilbert | 29c5917 | 2017-02-24 18:28:31 +0000 | [diff] [blame] | 3016 | * dirty host-page size chunks as all dirty. In this case the host-page |
| 3017 | * is the host-page for the particular RAMBlock, i.e. it might be a huge page |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 3018 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3019 | * Returns zero on success |
| 3020 | * |
| 3021 | * @ms: current migration state |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3022 | * @block: block we want to work with |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 3023 | */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3024 | static int postcopy_chunk_hostpages(MigrationState *ms, RAMBlock *block) |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 3025 | { |
Wei Yang | 810cf2b | 2019-07-24 09:07:21 +0800 | [diff] [blame] | 3026 | postcopy_discard_send_init(ms, block->idstr); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 3027 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3028 | /* |
Wei Yang | 1e7cf8c | 2019-08-19 14:18:42 +0800 | [diff] [blame] | 3029 | * Ensure that all partially dirty host pages are made fully dirty. |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3030 | */ |
Wei Yang | 1e7cf8c | 2019-08-19 14:18:42 +0800 | [diff] [blame] | 3031 | postcopy_chunk_hostpages_pass(ms, block); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 3032 | |
Wei Yang | 810cf2b | 2019-07-24 09:07:21 +0800 | [diff] [blame] | 3033 | postcopy_discard_send_finish(ms); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 3034 | return 0; |
| 3035 | } |
| 3036 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3037 | /** |
| 3038 | * ram_postcopy_send_discard_bitmap: transmit the discard bitmap |
| 3039 | * |
| 3040 | * Returns zero on success |
| 3041 | * |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3042 | * Transmit the set of pages to be discarded after precopy to the target |
| 3043 | * these are pages that: |
| 3044 | * a) Have been previously transmitted but are now dirty again |
| 3045 | * b) Pages that have never been transmitted, this ensures that |
| 3046 | * any pages on the destination that have been mapped by background |
| 3047 | * tasks get discarded (transparent huge pages is the specific concern) |
| 3048 | * Hopefully this is pretty sparse |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3049 | * |
| 3050 | * @ms: current migration state |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3051 | */ |
| 3052 | int ram_postcopy_send_discard_bitmap(MigrationState *ms) |
| 3053 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3054 | RAMState *rs = ram_state; |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3055 | RAMBlock *block; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3056 | int ret; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3057 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3058 | RCU_READ_LOCK_GUARD(); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3059 | |
| 3060 | /* This should be our last sync, the src is now paused */ |
Juan Quintela | eb859c5 | 2017-03-13 21:51:55 +0100 | [diff] [blame] | 3061 | migration_bitmap_sync(rs); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3062 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3063 | /* Easiest way to make sure we don't resume in the middle of a host-page */ |
| 3064 | rs->last_seen_block = NULL; |
| 3065 | rs->last_sent_block = NULL; |
| 3066 | rs->last_page = 0; |
| 3067 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3068 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3069 | /* Deal with TPS != HPS and huge pages */ |
| 3070 | ret = postcopy_chunk_hostpages(ms, block); |
| 3071 | if (ret) { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3072 | return ret; |
| 3073 | } |
| 3074 | |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3075 | #ifdef DEBUG_POSTCOPY |
Wei Yang | 1e7cf8c | 2019-08-19 14:18:42 +0800 | [diff] [blame] | 3076 | ram_debug_dump_bitmap(block->bmap, true, |
| 3077 | block->used_length >> TARGET_PAGE_BITS); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3078 | #endif |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3079 | } |
| 3080 | trace_ram_postcopy_send_discard_bitmap(); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3081 | |
| 3082 | ret = postcopy_each_ram_send_discard(ms); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3083 | |
| 3084 | return ret; |
| 3085 | } |
| 3086 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3087 | /** |
| 3088 | * ram_discard_range: discard dirtied pages at the beginning of postcopy |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3089 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3090 | * Returns zero on success |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3091 | * |
Juan Quintela | 3644915 | 2017-03-23 15:11:59 +0100 | [diff] [blame] | 3092 | * @rbname: name of the RAMBlock of the request. NULL means the |
| 3093 | * same that last one. |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3094 | * @start: RAMBlock starting page |
| 3095 | * @length: RAMBlock size |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3096 | */ |
Juan Quintela | aaa2064 | 2017-03-21 11:35:24 +0100 | [diff] [blame] | 3097 | int ram_discard_range(const char *rbname, uint64_t start, size_t length) |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3098 | { |
Juan Quintela | 3644915 | 2017-03-23 15:11:59 +0100 | [diff] [blame] | 3099 | trace_ram_discard_range(rbname, start, length); |
Dr. David Alan Gilbert | d3a5038 | 2017-02-24 18:28:32 +0000 | [diff] [blame] | 3100 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3101 | RCU_READ_LOCK_GUARD(); |
Juan Quintela | 3644915 | 2017-03-23 15:11:59 +0100 | [diff] [blame] | 3102 | RAMBlock *rb = qemu_ram_block_by_name(rbname); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3103 | |
| 3104 | if (!rb) { |
Juan Quintela | 3644915 | 2017-03-23 15:11:59 +0100 | [diff] [blame] | 3105 | error_report("ram_discard_range: Failed to find block '%s'", rbname); |
Daniel Henrique Barboza | 03acb4e | 2020-01-06 15:23:31 -0300 | [diff] [blame] | 3106 | return -1; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3107 | } |
| 3108 | |
Peter Xu | 814bb08 | 2018-07-23 20:33:02 +0800 | [diff] [blame] | 3109 | /* |
| 3110 | * On source VM, we don't need to update the received bitmap since |
| 3111 | * we don't even have one. |
| 3112 | */ |
| 3113 | if (rb->receivedmap) { |
| 3114 | bitmap_clear(rb->receivedmap, start >> qemu_target_page_bits(), |
| 3115 | length >> qemu_target_page_bits()); |
| 3116 | } |
| 3117 | |
Daniel Henrique Barboza | 03acb4e | 2020-01-06 15:23:31 -0300 | [diff] [blame] | 3118 | return ram_block_discard_range(rb, start, length); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3119 | } |
| 3120 | |
Peter Xu | 84593a0 | 2017-10-19 14:31:59 +0800 | [diff] [blame] | 3121 | /* |
| 3122 | * For every allocation, we will try not to crash the VM if the |
| 3123 | * allocation failed. |
| 3124 | */ |
| 3125 | static int xbzrle_init(void) |
| 3126 | { |
| 3127 | Error *local_err = NULL; |
| 3128 | |
| 3129 | if (!migrate_use_xbzrle()) { |
| 3130 | return 0; |
| 3131 | } |
| 3132 | |
| 3133 | XBZRLE_cache_lock(); |
| 3134 | |
| 3135 | XBZRLE.zero_target_page = g_try_malloc0(TARGET_PAGE_SIZE); |
| 3136 | if (!XBZRLE.zero_target_page) { |
| 3137 | error_report("%s: Error allocating zero page", __func__); |
| 3138 | goto err_out; |
| 3139 | } |
| 3140 | |
| 3141 | XBZRLE.cache = cache_init(migrate_xbzrle_cache_size(), |
| 3142 | TARGET_PAGE_SIZE, &local_err); |
| 3143 | if (!XBZRLE.cache) { |
| 3144 | error_report_err(local_err); |
| 3145 | goto free_zero_page; |
| 3146 | } |
| 3147 | |
| 3148 | XBZRLE.encoded_buf = g_try_malloc0(TARGET_PAGE_SIZE); |
| 3149 | if (!XBZRLE.encoded_buf) { |
| 3150 | error_report("%s: Error allocating encoded_buf", __func__); |
| 3151 | goto free_cache; |
| 3152 | } |
| 3153 | |
| 3154 | XBZRLE.current_buf = g_try_malloc(TARGET_PAGE_SIZE); |
| 3155 | if (!XBZRLE.current_buf) { |
| 3156 | error_report("%s: Error allocating current_buf", __func__); |
| 3157 | goto free_encoded_buf; |
| 3158 | } |
| 3159 | |
| 3160 | /* We are all good */ |
| 3161 | XBZRLE_cache_unlock(); |
| 3162 | return 0; |
| 3163 | |
| 3164 | free_encoded_buf: |
| 3165 | g_free(XBZRLE.encoded_buf); |
| 3166 | XBZRLE.encoded_buf = NULL; |
| 3167 | free_cache: |
| 3168 | cache_fini(XBZRLE.cache); |
| 3169 | XBZRLE.cache = NULL; |
| 3170 | free_zero_page: |
| 3171 | g_free(XBZRLE.zero_target_page); |
| 3172 | XBZRLE.zero_target_page = NULL; |
| 3173 | err_out: |
| 3174 | XBZRLE_cache_unlock(); |
| 3175 | return -ENOMEM; |
| 3176 | } |
| 3177 | |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3178 | static int ram_state_init(RAMState **rsp) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3179 | { |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3180 | *rsp = g_try_new0(RAMState, 1); |
| 3181 | |
| 3182 | if (!*rsp) { |
| 3183 | error_report("%s: Init ramstate fail", __func__); |
| 3184 | return -1; |
| 3185 | } |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3186 | |
| 3187 | qemu_mutex_init(&(*rsp)->bitmap_mutex); |
| 3188 | qemu_mutex_init(&(*rsp)->src_page_req_mutex); |
| 3189 | QSIMPLEQ_INIT(&(*rsp)->src_page_requests); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3190 | |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3191 | /* |
Ivan Ren | 40c4d4a | 2019-07-14 22:51:19 +0800 | [diff] [blame] | 3192 | * Count the total number of pages used by ram blocks not including any |
| 3193 | * gaps due to alignment or unplugs. |
Wei Yang | 0315851 | 2019-06-04 14:17:27 +0800 | [diff] [blame] | 3194 | * This must match with the initial values of dirty bitmap. |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3195 | */ |
Ivan Ren | 40c4d4a | 2019-07-14 22:51:19 +0800 | [diff] [blame] | 3196 | (*rsp)->migration_dirty_pages = ram_bytes_total() >> TARGET_PAGE_BITS; |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3197 | ram_state_reset(*rsp); |
| 3198 | |
| 3199 | return 0; |
| 3200 | } |
| 3201 | |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3202 | static void ram_list_init_bitmaps(void) |
| 3203 | { |
Peter Xu | 002cad6 | 2019-06-03 14:50:56 +0800 | [diff] [blame] | 3204 | MigrationState *ms = migrate_get_current(); |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3205 | RAMBlock *block; |
| 3206 | unsigned long pages; |
Peter Xu | 002cad6 | 2019-06-03 14:50:56 +0800 | [diff] [blame] | 3207 | uint8_t shift; |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3208 | |
| 3209 | /* Skip setting bitmap if there is no RAM */ |
| 3210 | if (ram_bytes_total()) { |
Peter Xu | 002cad6 | 2019-06-03 14:50:56 +0800 | [diff] [blame] | 3211 | shift = ms->clear_bitmap_shift; |
| 3212 | if (shift > CLEAR_BITMAP_SHIFT_MAX) { |
| 3213 | error_report("clear_bitmap_shift (%u) too big, using " |
| 3214 | "max value (%u)", shift, CLEAR_BITMAP_SHIFT_MAX); |
| 3215 | shift = CLEAR_BITMAP_SHIFT_MAX; |
| 3216 | } else if (shift < CLEAR_BITMAP_SHIFT_MIN) { |
| 3217 | error_report("clear_bitmap_shift (%u) too small, using " |
| 3218 | "min value (%u)", shift, CLEAR_BITMAP_SHIFT_MIN); |
| 3219 | shift = CLEAR_BITMAP_SHIFT_MIN; |
| 3220 | } |
| 3221 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3222 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3223 | pages = block->max_length >> TARGET_PAGE_BITS; |
Wei Yang | 0315851 | 2019-06-04 14:17:27 +0800 | [diff] [blame] | 3224 | /* |
| 3225 | * The initial dirty bitmap for migration must be set with all |
| 3226 | * ones to make sure we'll migrate every guest RAM page to |
| 3227 | * destination. |
Ivan Ren | 40c4d4a | 2019-07-14 22:51:19 +0800 | [diff] [blame] | 3228 | * Here we set RAMBlock.bmap all to 1 because when rebegin a |
| 3229 | * new migration after a failed migration, ram_list. |
| 3230 | * dirty_memory[DIRTY_MEMORY_MIGRATION] don't include the whole |
| 3231 | * guest memory. |
Wei Yang | 0315851 | 2019-06-04 14:17:27 +0800 | [diff] [blame] | 3232 | */ |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3233 | block->bmap = bitmap_new(pages); |
Ivan Ren | 40c4d4a | 2019-07-14 22:51:19 +0800 | [diff] [blame] | 3234 | bitmap_set(block->bmap, 0, pages); |
Peter Xu | 002cad6 | 2019-06-03 14:50:56 +0800 | [diff] [blame] | 3235 | block->clear_bmap_shift = shift; |
| 3236 | block->clear_bmap = bitmap_new(clear_bmap_size(pages, shift)); |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3237 | } |
| 3238 | } |
| 3239 | } |
| 3240 | |
| 3241 | static void ram_init_bitmaps(RAMState *rs) |
| 3242 | { |
| 3243 | /* For memory_global_dirty_log_start below. */ |
| 3244 | qemu_mutex_lock_iothread(); |
| 3245 | qemu_mutex_lock_ramlist(); |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3246 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3247 | WITH_RCU_READ_LOCK_GUARD() { |
| 3248 | ram_list_init_bitmaps(); |
| 3249 | memory_global_dirty_log_start(); |
| 3250 | migration_bitmap_sync_precopy(rs); |
| 3251 | } |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3252 | qemu_mutex_unlock_ramlist(); |
| 3253 | qemu_mutex_unlock_iothread(); |
| 3254 | } |
| 3255 | |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3256 | static int ram_init_all(RAMState **rsp) |
| 3257 | { |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3258 | if (ram_state_init(rsp)) { |
| 3259 | return -1; |
| 3260 | } |
| 3261 | |
Peter Xu | 84593a0 | 2017-10-19 14:31:59 +0800 | [diff] [blame] | 3262 | if (xbzrle_init()) { |
| 3263 | ram_state_cleanup(rsp); |
| 3264 | return -1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3265 | } |
| 3266 | |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3267 | ram_init_bitmaps(*rsp); |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3268 | |
| 3269 | return 0; |
| 3270 | } |
| 3271 | |
Peter Xu | 08614f3 | 2018-05-02 18:47:33 +0800 | [diff] [blame] | 3272 | static void ram_state_resume_prepare(RAMState *rs, QEMUFile *out) |
| 3273 | { |
| 3274 | RAMBlock *block; |
| 3275 | uint64_t pages = 0; |
| 3276 | |
| 3277 | /* |
| 3278 | * Postcopy is not using xbzrle/compression, so no need for that. |
| 3279 | * Also, since source are already halted, we don't need to care |
| 3280 | * about dirty page logging as well. |
| 3281 | */ |
| 3282 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3283 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Peter Xu | 08614f3 | 2018-05-02 18:47:33 +0800 | [diff] [blame] | 3284 | pages += bitmap_count_one(block->bmap, |
| 3285 | block->used_length >> TARGET_PAGE_BITS); |
| 3286 | } |
| 3287 | |
| 3288 | /* This may not be aligned with current bitmaps. Recalculate. */ |
| 3289 | rs->migration_dirty_pages = pages; |
| 3290 | |
| 3291 | rs->last_seen_block = NULL; |
| 3292 | rs->last_sent_block = NULL; |
| 3293 | rs->last_page = 0; |
| 3294 | rs->last_version = ram_list.version; |
| 3295 | /* |
| 3296 | * Disable the bulk stage, otherwise we'll resend the whole RAM no |
| 3297 | * matter what we have sent. |
| 3298 | */ |
| 3299 | rs->ram_bulk_stage = false; |
| 3300 | |
| 3301 | /* Update RAMState cache of output QEMUFile */ |
| 3302 | rs->f = out; |
| 3303 | |
| 3304 | trace_ram_state_resume_prepare(pages); |
| 3305 | } |
| 3306 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3307 | /* |
Wei Wang | 6bcb05f | 2018-12-11 16:24:50 +0800 | [diff] [blame] | 3308 | * This function clears bits of the free pages reported by the caller from the |
| 3309 | * migration dirty bitmap. @addr is the host address corresponding to the |
| 3310 | * start of the continuous guest free pages, and @len is the total bytes of |
| 3311 | * those pages. |
| 3312 | */ |
| 3313 | void qemu_guest_free_page_hint(void *addr, size_t len) |
| 3314 | { |
| 3315 | RAMBlock *block; |
| 3316 | ram_addr_t offset; |
| 3317 | size_t used_len, start, npages; |
| 3318 | MigrationState *s = migrate_get_current(); |
| 3319 | |
| 3320 | /* This function is currently expected to be used during live migration */ |
| 3321 | if (!migration_is_setup_or_active(s->state)) { |
| 3322 | return; |
| 3323 | } |
| 3324 | |
| 3325 | for (; len > 0; len -= used_len, addr += used_len) { |
| 3326 | block = qemu_ram_block_from_host(addr, false, &offset); |
| 3327 | if (unlikely(!block || offset >= block->used_length)) { |
| 3328 | /* |
| 3329 | * The implementation might not support RAMBlock resize during |
| 3330 | * live migration, but it could happen in theory with future |
| 3331 | * updates. So we add a check here to capture that case. |
| 3332 | */ |
| 3333 | error_report_once("%s unexpected error", __func__); |
| 3334 | return; |
| 3335 | } |
| 3336 | |
| 3337 | if (len <= block->used_length - offset) { |
| 3338 | used_len = len; |
| 3339 | } else { |
| 3340 | used_len = block->used_length - offset; |
| 3341 | } |
| 3342 | |
| 3343 | start = offset >> TARGET_PAGE_BITS; |
| 3344 | npages = used_len >> TARGET_PAGE_BITS; |
| 3345 | |
| 3346 | qemu_mutex_lock(&ram_state->bitmap_mutex); |
| 3347 | ram_state->migration_dirty_pages -= |
| 3348 | bitmap_count_one_with_offset(block->bmap, start, npages); |
| 3349 | bitmap_clear(block->bmap, start, npages); |
| 3350 | qemu_mutex_unlock(&ram_state->bitmap_mutex); |
| 3351 | } |
| 3352 | } |
| 3353 | |
| 3354 | /* |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3355 | * Each of ram_save_setup, ram_save_iterate and ram_save_complete has |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3356 | * long-running RCU critical section. When rcu-reclaims in the code |
| 3357 | * start to become numerous it will be necessary to reduce the |
| 3358 | * granularity of these critical sections. |
| 3359 | */ |
| 3360 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3361 | /** |
| 3362 | * ram_save_setup: Setup RAM for migration |
| 3363 | * |
| 3364 | * Returns zero to indicate success and negative for error |
| 3365 | * |
| 3366 | * @f: QEMUFile where to send the data |
| 3367 | * @opaque: RAMState pointer |
| 3368 | */ |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3369 | static int ram_save_setup(QEMUFile *f, void *opaque) |
| 3370 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3371 | RAMState **rsp = opaque; |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3372 | RAMBlock *block; |
| 3373 | |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 3374 | if (compress_threads_save_setup()) { |
| 3375 | return -1; |
| 3376 | } |
| 3377 | |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3378 | /* migration has already setup the bitmap, reuse it. */ |
| 3379 | if (!migration_in_colo_state()) { |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3380 | if (ram_init_all(rsp) != 0) { |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 3381 | compress_threads_save_cleanup(); |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3382 | return -1; |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3383 | } |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3384 | } |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3385 | (*rsp)->f = f; |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3386 | |
Dr. David Alan Gilbert | 0e6ebd4 | 2019-10-07 15:36:38 +0100 | [diff] [blame] | 3387 | WITH_RCU_READ_LOCK_GUARD() { |
| 3388 | qemu_put_be64(f, ram_bytes_total_common(true) | RAM_SAVE_FLAG_MEM_SIZE); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3389 | |
Dr. David Alan Gilbert | 0e6ebd4 | 2019-10-07 15:36:38 +0100 | [diff] [blame] | 3390 | RAMBLOCK_FOREACH_MIGRATABLE(block) { |
| 3391 | qemu_put_byte(f, strlen(block->idstr)); |
| 3392 | qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr)); |
| 3393 | qemu_put_be64(f, block->used_length); |
| 3394 | if (migrate_postcopy_ram() && block->page_size != |
| 3395 | qemu_host_page_size) { |
| 3396 | qemu_put_be64(f, block->page_size); |
| 3397 | } |
| 3398 | if (migrate_ignore_shared()) { |
| 3399 | qemu_put_be64(f, block->mr->addr); |
| 3400 | } |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3401 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3402 | } |
| 3403 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3404 | ram_control_before_iterate(f, RAM_CONTROL_SETUP); |
| 3405 | ram_control_after_iterate(f, RAM_CONTROL_SETUP); |
| 3406 | |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 3407 | multifd_send_sync_main(*rsp); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3408 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); |
Juan Quintela | 35374cb | 2018-04-18 10:13:21 +0200 | [diff] [blame] | 3409 | qemu_fflush(f); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3410 | |
| 3411 | return 0; |
| 3412 | } |
| 3413 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3414 | /** |
| 3415 | * ram_save_iterate: iterative stage for migration |
| 3416 | * |
| 3417 | * Returns zero to indicate success and negative for error |
| 3418 | * |
| 3419 | * @f: QEMUFile where to send the data |
| 3420 | * @opaque: RAMState pointer |
| 3421 | */ |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3422 | static int ram_save_iterate(QEMUFile *f, void *opaque) |
| 3423 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3424 | RAMState **temp = opaque; |
| 3425 | RAMState *rs = *temp; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3426 | int ret; |
| 3427 | int i; |
| 3428 | int64_t t0; |
Thomas Huth | 5c90308 | 2016-11-04 14:10:17 +0100 | [diff] [blame] | 3429 | int done = 0; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3430 | |
Peter Lieven | b255734 | 2018-03-08 12:18:24 +0100 | [diff] [blame] | 3431 | if (blk_mig_bulk_active()) { |
| 3432 | /* Avoid transferring ram during bulk phase of block migration as |
| 3433 | * the bulk phase will usually take a long time and transferring |
| 3434 | * ram updates during that time is pointless. */ |
| 3435 | goto out; |
| 3436 | } |
| 3437 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3438 | WITH_RCU_READ_LOCK_GUARD() { |
| 3439 | if (ram_list.version != rs->last_version) { |
| 3440 | ram_state_reset(rs); |
Dr. David Alan Gilbert | e03a34f | 2018-06-13 11:26:42 +0100 | [diff] [blame] | 3441 | } |
| 3442 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3443 | /* Read version before ram_list.blocks */ |
| 3444 | smp_rmb(); |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3445 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3446 | ram_control_before_iterate(f, RAM_CONTROL_ROUND); |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3447 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3448 | t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); |
| 3449 | i = 0; |
| 3450 | while ((ret = qemu_file_rate_limit(f)) == 0 || |
| 3451 | !QSIMPLEQ_EMPTY(&rs->src_page_requests)) { |
| 3452 | int pages; |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 3453 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3454 | if (qemu_file_get_error(f)) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3455 | break; |
| 3456 | } |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3457 | |
| 3458 | pages = ram_find_and_save_block(rs, false); |
| 3459 | /* no more pages to sent */ |
| 3460 | if (pages == 0) { |
| 3461 | done = 1; |
| 3462 | break; |
| 3463 | } |
| 3464 | |
| 3465 | if (pages < 0) { |
| 3466 | qemu_file_set_error(f, pages); |
| 3467 | break; |
| 3468 | } |
| 3469 | |
| 3470 | rs->target_page_count += pages; |
| 3471 | |
| 3472 | /* |
Wei Yang | 644acf9 | 2019-11-07 20:39:07 +0800 | [diff] [blame^] | 3473 | * During postcopy, it is necessary to make sure one whole host |
| 3474 | * page is sent in one chunk. |
| 3475 | */ |
| 3476 | if (migrate_postcopy_ram()) { |
| 3477 | flush_compressed_data(rs); |
| 3478 | } |
| 3479 | |
| 3480 | /* |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3481 | * we want to check in the 1st loop, just in case it was the 1st |
| 3482 | * time and we had to sync the dirty bitmap. |
| 3483 | * qemu_clock_get_ns() is a bit expensive, so we only check each |
| 3484 | * some iterations |
| 3485 | */ |
| 3486 | if ((i & 63) == 0) { |
| 3487 | uint64_t t1 = (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - t0) / |
| 3488 | 1000000; |
| 3489 | if (t1 > MAX_WAIT) { |
| 3490 | trace_ram_save_iterate_big_wait(t1, i); |
| 3491 | break; |
| 3492 | } |
| 3493 | } |
| 3494 | i++; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3495 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3496 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3497 | |
| 3498 | /* |
| 3499 | * Must occur before EOS (or any QEMUFile operation) |
| 3500 | * because of RDMA protocol. |
| 3501 | */ |
| 3502 | ram_control_after_iterate(f, RAM_CONTROL_ROUND); |
| 3503 | |
Peter Lieven | b255734 | 2018-03-08 12:18:24 +0100 | [diff] [blame] | 3504 | out: |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 3505 | multifd_send_sync_main(rs); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3506 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); |
Juan Quintela | 35374cb | 2018-04-18 10:13:21 +0200 | [diff] [blame] | 3507 | qemu_fflush(f); |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 3508 | ram_counters.transferred += 8; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3509 | |
| 3510 | ret = qemu_file_get_error(f); |
| 3511 | if (ret < 0) { |
| 3512 | return ret; |
| 3513 | } |
| 3514 | |
Thomas Huth | 5c90308 | 2016-11-04 14:10:17 +0100 | [diff] [blame] | 3515 | return done; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3516 | } |
| 3517 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3518 | /** |
| 3519 | * ram_save_complete: function called to send the remaining amount of ram |
| 3520 | * |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3521 | * Returns zero to indicate success or negative on error |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3522 | * |
| 3523 | * Called with iothread lock |
| 3524 | * |
| 3525 | * @f: QEMUFile where to send the data |
| 3526 | * @opaque: RAMState pointer |
| 3527 | */ |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3528 | static int ram_save_complete(QEMUFile *f, void *opaque) |
| 3529 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3530 | RAMState **temp = opaque; |
| 3531 | RAMState *rs = *temp; |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3532 | int ret = 0; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 3533 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3534 | WITH_RCU_READ_LOCK_GUARD() { |
| 3535 | if (!migration_in_postcopy()) { |
| 3536 | migration_bitmap_sync_precopy(rs); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3537 | } |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3538 | |
| 3539 | ram_control_before_iterate(f, RAM_CONTROL_FINISH); |
| 3540 | |
| 3541 | /* try transferring iterative blocks of memory */ |
| 3542 | |
| 3543 | /* flush all remaining blocks regardless of rate limiting */ |
| 3544 | while (true) { |
| 3545 | int pages; |
| 3546 | |
| 3547 | pages = ram_find_and_save_block(rs, !migration_in_colo_state()); |
| 3548 | /* no more blocks to sent */ |
| 3549 | if (pages == 0) { |
| 3550 | break; |
| 3551 | } |
| 3552 | if (pages < 0) { |
| 3553 | ret = pages; |
| 3554 | break; |
| 3555 | } |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3556 | } |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3557 | |
| 3558 | flush_compressed_data(rs); |
| 3559 | ram_control_after_iterate(f, RAM_CONTROL_FINISH); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3560 | } |
| 3561 | |
Ivan Ren | 1b81c97 | 2019-07-30 13:33:35 +0800 | [diff] [blame] | 3562 | multifd_send_sync_main(rs); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3563 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); |
Juan Quintela | 35374cb | 2018-04-18 10:13:21 +0200 | [diff] [blame] | 3564 | qemu_fflush(f); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3565 | |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3566 | return ret; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3567 | } |
| 3568 | |
Dr. David Alan Gilbert | c31b098 | 2015-11-05 18:10:54 +0000 | [diff] [blame] | 3569 | static void ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size, |
Vladimir Sementsov-Ogievskiy | 4799502 | 2018-03-13 15:34:00 -0400 | [diff] [blame] | 3570 | uint64_t *res_precopy_only, |
| 3571 | uint64_t *res_compatible, |
| 3572 | uint64_t *res_postcopy_only) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3573 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3574 | RAMState **temp = opaque; |
| 3575 | RAMState *rs = *temp; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3576 | uint64_t remaining_size; |
| 3577 | |
Juan Quintela | 9edabd4 | 2017-03-14 12:02:16 +0100 | [diff] [blame] | 3578 | remaining_size = rs->migration_dirty_pages * TARGET_PAGE_SIZE; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3579 | |
Juan Quintela | 5727309 | 2017-03-20 22:25:28 +0100 | [diff] [blame] | 3580 | if (!migration_in_postcopy() && |
Dr. David Alan Gilbert | 663e6c1 | 2015-11-05 18:11:13 +0000 | [diff] [blame] | 3581 | remaining_size < max_size) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3582 | qemu_mutex_lock_iothread(); |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3583 | WITH_RCU_READ_LOCK_GUARD() { |
| 3584 | migration_bitmap_sync_precopy(rs); |
| 3585 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3586 | qemu_mutex_unlock_iothread(); |
Juan Quintela | 9edabd4 | 2017-03-14 12:02:16 +0100 | [diff] [blame] | 3587 | remaining_size = rs->migration_dirty_pages * TARGET_PAGE_SIZE; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3588 | } |
Dr. David Alan Gilbert | c31b098 | 2015-11-05 18:10:54 +0000 | [diff] [blame] | 3589 | |
Vladimir Sementsov-Ogievskiy | 86e1167 | 2017-07-10 19:30:15 +0300 | [diff] [blame] | 3590 | if (migrate_postcopy_ram()) { |
| 3591 | /* We can do postcopy, and all the data is postcopiable */ |
Vladimir Sementsov-Ogievskiy | 4799502 | 2018-03-13 15:34:00 -0400 | [diff] [blame] | 3592 | *res_compatible += remaining_size; |
Vladimir Sementsov-Ogievskiy | 86e1167 | 2017-07-10 19:30:15 +0300 | [diff] [blame] | 3593 | } else { |
Vladimir Sementsov-Ogievskiy | 4799502 | 2018-03-13 15:34:00 -0400 | [diff] [blame] | 3594 | *res_precopy_only += remaining_size; |
Vladimir Sementsov-Ogievskiy | 86e1167 | 2017-07-10 19:30:15 +0300 | [diff] [blame] | 3595 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3596 | } |
| 3597 | |
| 3598 | static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host) |
| 3599 | { |
| 3600 | unsigned int xh_len; |
| 3601 | int xh_flags; |
Dr. David Alan Gilbert | 063e760 | 2015-12-16 11:47:37 +0000 | [diff] [blame] | 3602 | uint8_t *loaded_data; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3603 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3604 | /* extract RLE header */ |
| 3605 | xh_flags = qemu_get_byte(f); |
| 3606 | xh_len = qemu_get_be16(f); |
| 3607 | |
| 3608 | if (xh_flags != ENCODING_FLAG_XBZRLE) { |
| 3609 | error_report("Failed to load XBZRLE page - wrong compression!"); |
| 3610 | return -1; |
| 3611 | } |
| 3612 | |
| 3613 | if (xh_len > TARGET_PAGE_SIZE) { |
| 3614 | error_report("Failed to load XBZRLE page - len overflow!"); |
| 3615 | return -1; |
| 3616 | } |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 3617 | loaded_data = XBZRLE.decoded_buf; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3618 | /* load data and decode */ |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 3619 | /* it can change loaded_data to point to an internal buffer */ |
Dr. David Alan Gilbert | 063e760 | 2015-12-16 11:47:37 +0000 | [diff] [blame] | 3620 | qemu_get_buffer_in_place(f, &loaded_data, xh_len); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3621 | |
| 3622 | /* decode RLE */ |
Dr. David Alan Gilbert | 063e760 | 2015-12-16 11:47:37 +0000 | [diff] [blame] | 3623 | if (xbzrle_decode_buffer(loaded_data, xh_len, host, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3624 | TARGET_PAGE_SIZE) == -1) { |
| 3625 | error_report("Failed to load XBZRLE page - decode error!"); |
| 3626 | return -1; |
| 3627 | } |
| 3628 | |
| 3629 | return 0; |
| 3630 | } |
| 3631 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3632 | /** |
| 3633 | * ram_block_from_stream: read a RAMBlock id from the migration stream |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 3634 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3635 | * Must be called from within a rcu critical section. |
| 3636 | * |
| 3637 | * Returns a pointer from within the RCU-protected ram_list. |
| 3638 | * |
| 3639 | * @f: QEMUFile where to read the data from |
| 3640 | * @flags: Page flags (mostly to see if it's a continuation of previous block) |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 3641 | */ |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3642 | static inline RAMBlock *ram_block_from_stream(QEMUFile *f, int flags) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3643 | { |
| 3644 | static RAMBlock *block = NULL; |
| 3645 | char id[256]; |
| 3646 | uint8_t len; |
| 3647 | |
| 3648 | if (flags & RAM_SAVE_FLAG_CONTINUE) { |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 3649 | if (!block) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3650 | error_report("Ack, bad migration stream!"); |
| 3651 | return NULL; |
| 3652 | } |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 3653 | return block; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3654 | } |
| 3655 | |
| 3656 | len = qemu_get_byte(f); |
| 3657 | qemu_get_buffer(f, (uint8_t *)id, len); |
| 3658 | id[len] = 0; |
| 3659 | |
Dr. David Alan Gilbert | e3dd749 | 2015-11-05 18:10:33 +0000 | [diff] [blame] | 3660 | block = qemu_ram_block_by_name(id); |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 3661 | if (!block) { |
| 3662 | error_report("Can't find block %s", id); |
| 3663 | return NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3664 | } |
| 3665 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3666 | if (ramblock_is_ignored(block)) { |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 3667 | error_report("block %s should not be migrated !", id); |
| 3668 | return NULL; |
| 3669 | } |
| 3670 | |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 3671 | return block; |
| 3672 | } |
| 3673 | |
| 3674 | static inline void *host_from_ram_block_offset(RAMBlock *block, |
| 3675 | ram_addr_t offset) |
| 3676 | { |
| 3677 | if (!offset_in_ramblock(block, offset)) { |
| 3678 | return NULL; |
| 3679 | } |
| 3680 | |
| 3681 | return block->host + offset; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3682 | } |
| 3683 | |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3684 | static inline void *colo_cache_from_block_offset(RAMBlock *block, |
| 3685 | ram_addr_t offset) |
| 3686 | { |
| 3687 | if (!offset_in_ramblock(block, offset)) { |
| 3688 | return NULL; |
| 3689 | } |
| 3690 | if (!block->colo_cache) { |
| 3691 | error_report("%s: colo_cache is NULL in block :%s", |
| 3692 | __func__, block->idstr); |
| 3693 | return NULL; |
| 3694 | } |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3695 | |
| 3696 | /* |
| 3697 | * During colo checkpoint, we need bitmap of these migrated pages. |
| 3698 | * It help us to decide which pages in ram cache should be flushed |
| 3699 | * into VM's RAM later. |
| 3700 | */ |
| 3701 | if (!test_and_set_bit(offset >> TARGET_PAGE_BITS, block->bmap)) { |
| 3702 | ram_state->migration_dirty_pages++; |
| 3703 | } |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3704 | return block->colo_cache + offset; |
| 3705 | } |
| 3706 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3707 | /** |
| 3708 | * ram_handle_compressed: handle the zero page case |
| 3709 | * |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3710 | * If a page (or a whole RDMA chunk) has been |
| 3711 | * determined to be zero, then zap it. |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3712 | * |
| 3713 | * @host: host address for the zero page |
| 3714 | * @ch: what the page is filled from. We only support zero |
| 3715 | * @size: size of the zero page |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3716 | */ |
| 3717 | void ram_handle_compressed(void *host, uint8_t ch, uint64_t size) |
| 3718 | { |
| 3719 | if (ch != 0 || !is_zero_range(host, size)) { |
| 3720 | memset(host, ch, size); |
| 3721 | } |
| 3722 | } |
| 3723 | |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3724 | /* return the size after decompression, or negative value on error */ |
| 3725 | static int |
| 3726 | qemu_uncompress_data(z_stream *stream, uint8_t *dest, size_t dest_len, |
| 3727 | const uint8_t *source, size_t source_len) |
| 3728 | { |
| 3729 | int err; |
| 3730 | |
| 3731 | err = inflateReset(stream); |
| 3732 | if (err != Z_OK) { |
| 3733 | return -1; |
| 3734 | } |
| 3735 | |
| 3736 | stream->avail_in = source_len; |
| 3737 | stream->next_in = (uint8_t *)source; |
| 3738 | stream->avail_out = dest_len; |
| 3739 | stream->next_out = dest; |
| 3740 | |
| 3741 | err = inflate(stream, Z_NO_FLUSH); |
| 3742 | if (err != Z_STREAM_END) { |
| 3743 | return -1; |
| 3744 | } |
| 3745 | |
| 3746 | return stream->total_out; |
| 3747 | } |
| 3748 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3749 | static void *do_data_decompress(void *opaque) |
| 3750 | { |
| 3751 | DecompressParam *param = opaque; |
| 3752 | unsigned long pagesize; |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3753 | uint8_t *des; |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3754 | int len, ret; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3755 | |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3756 | qemu_mutex_lock(¶m->mutex); |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 3757 | while (!param->quit) { |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3758 | if (param->des) { |
| 3759 | des = param->des; |
| 3760 | len = param->len; |
| 3761 | param->des = 0; |
| 3762 | qemu_mutex_unlock(¶m->mutex); |
| 3763 | |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3764 | pagesize = TARGET_PAGE_SIZE; |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3765 | |
| 3766 | ret = qemu_uncompress_data(¶m->stream, des, pagesize, |
| 3767 | param->compbuf, len); |
Xiao Guangrong | f548222 | 2018-05-03 16:06:11 +0800 | [diff] [blame] | 3768 | if (ret < 0 && migrate_get_current()->decompress_error_check) { |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3769 | error_report("decompress data failed"); |
| 3770 | qemu_file_set_error(decomp_file, ret); |
| 3771 | } |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3772 | |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3773 | qemu_mutex_lock(&decomp_done_lock); |
| 3774 | param->done = true; |
| 3775 | qemu_cond_signal(&decomp_done_cond); |
| 3776 | qemu_mutex_unlock(&decomp_done_lock); |
| 3777 | |
| 3778 | qemu_mutex_lock(¶m->mutex); |
| 3779 | } else { |
| 3780 | qemu_cond_wait(¶m->cond, ¶m->mutex); |
| 3781 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3782 | } |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3783 | qemu_mutex_unlock(¶m->mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3784 | |
| 3785 | return NULL; |
| 3786 | } |
| 3787 | |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3788 | static int wait_for_decompress_done(void) |
Liang Li | 5533b2e | 2016-05-05 15:32:52 +0800 | [diff] [blame] | 3789 | { |
| 3790 | int idx, thread_count; |
| 3791 | |
| 3792 | if (!migrate_use_compression()) { |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3793 | return 0; |
Liang Li | 5533b2e | 2016-05-05 15:32:52 +0800 | [diff] [blame] | 3794 | } |
| 3795 | |
| 3796 | thread_count = migrate_decompress_threads(); |
| 3797 | qemu_mutex_lock(&decomp_done_lock); |
| 3798 | for (idx = 0; idx < thread_count; idx++) { |
| 3799 | while (!decomp_param[idx].done) { |
| 3800 | qemu_cond_wait(&decomp_done_cond, &decomp_done_lock); |
| 3801 | } |
| 3802 | } |
| 3803 | qemu_mutex_unlock(&decomp_done_lock); |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3804 | return qemu_file_get_error(decomp_file); |
Liang Li | 5533b2e | 2016-05-05 15:32:52 +0800 | [diff] [blame] | 3805 | } |
| 3806 | |
Juan Quintela | f0afa33 | 2017-06-28 11:52:28 +0200 | [diff] [blame] | 3807 | static void compress_threads_load_cleanup(void) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3808 | { |
| 3809 | int i, thread_count; |
| 3810 | |
Juan Quintela | 3416ab5 | 2016-04-20 11:56:01 +0200 | [diff] [blame] | 3811 | if (!migrate_use_compression()) { |
| 3812 | return; |
| 3813 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3814 | thread_count = migrate_decompress_threads(); |
| 3815 | for (i = 0; i < thread_count; i++) { |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3816 | /* |
| 3817 | * we use it as a indicator which shows if the thread is |
| 3818 | * properly init'd or not |
| 3819 | */ |
| 3820 | if (!decomp_param[i].compbuf) { |
| 3821 | break; |
| 3822 | } |
| 3823 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3824 | qemu_mutex_lock(&decomp_param[i].mutex); |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 3825 | decomp_param[i].quit = true; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3826 | qemu_cond_signal(&decomp_param[i].cond); |
| 3827 | qemu_mutex_unlock(&decomp_param[i].mutex); |
| 3828 | } |
| 3829 | for (i = 0; i < thread_count; i++) { |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3830 | if (!decomp_param[i].compbuf) { |
| 3831 | break; |
| 3832 | } |
| 3833 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3834 | qemu_thread_join(decompress_threads + i); |
| 3835 | qemu_mutex_destroy(&decomp_param[i].mutex); |
| 3836 | qemu_cond_destroy(&decomp_param[i].cond); |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3837 | inflateEnd(&decomp_param[i].stream); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3838 | g_free(decomp_param[i].compbuf); |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3839 | decomp_param[i].compbuf = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3840 | } |
| 3841 | g_free(decompress_threads); |
| 3842 | g_free(decomp_param); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3843 | decompress_threads = NULL; |
| 3844 | decomp_param = NULL; |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3845 | decomp_file = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3846 | } |
| 3847 | |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3848 | static int compress_threads_load_setup(QEMUFile *f) |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3849 | { |
| 3850 | int i, thread_count; |
| 3851 | |
| 3852 | if (!migrate_use_compression()) { |
| 3853 | return 0; |
| 3854 | } |
| 3855 | |
| 3856 | thread_count = migrate_decompress_threads(); |
| 3857 | decompress_threads = g_new0(QemuThread, thread_count); |
| 3858 | decomp_param = g_new0(DecompressParam, thread_count); |
| 3859 | qemu_mutex_init(&decomp_done_lock); |
| 3860 | qemu_cond_init(&decomp_done_cond); |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3861 | decomp_file = f; |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3862 | for (i = 0; i < thread_count; i++) { |
| 3863 | if (inflateInit(&decomp_param[i].stream) != Z_OK) { |
| 3864 | goto exit; |
| 3865 | } |
| 3866 | |
| 3867 | decomp_param[i].compbuf = g_malloc0(compressBound(TARGET_PAGE_SIZE)); |
| 3868 | qemu_mutex_init(&decomp_param[i].mutex); |
| 3869 | qemu_cond_init(&decomp_param[i].cond); |
| 3870 | decomp_param[i].done = true; |
| 3871 | decomp_param[i].quit = false; |
| 3872 | qemu_thread_create(decompress_threads + i, "decompress", |
| 3873 | do_data_decompress, decomp_param + i, |
| 3874 | QEMU_THREAD_JOINABLE); |
| 3875 | } |
| 3876 | return 0; |
| 3877 | exit: |
| 3878 | compress_threads_load_cleanup(); |
| 3879 | return -1; |
| 3880 | } |
| 3881 | |
Dr. David Alan Gilbert | c1bc662 | 2015-12-16 11:47:38 +0000 | [diff] [blame] | 3882 | static void decompress_data_with_multi_threads(QEMUFile *f, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3883 | void *host, int len) |
| 3884 | { |
| 3885 | int idx, thread_count; |
| 3886 | |
| 3887 | thread_count = migrate_decompress_threads(); |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3888 | qemu_mutex_lock(&decomp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3889 | while (true) { |
| 3890 | for (idx = 0; idx < thread_count; idx++) { |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3891 | if (decomp_param[idx].done) { |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3892 | decomp_param[idx].done = false; |
| 3893 | qemu_mutex_lock(&decomp_param[idx].mutex); |
Dr. David Alan Gilbert | c1bc662 | 2015-12-16 11:47:38 +0000 | [diff] [blame] | 3894 | qemu_get_buffer(f, decomp_param[idx].compbuf, len); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3895 | decomp_param[idx].des = host; |
| 3896 | decomp_param[idx].len = len; |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3897 | qemu_cond_signal(&decomp_param[idx].cond); |
| 3898 | qemu_mutex_unlock(&decomp_param[idx].mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3899 | break; |
| 3900 | } |
| 3901 | } |
| 3902 | if (idx < thread_count) { |
| 3903 | break; |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3904 | } else { |
| 3905 | qemu_cond_wait(&decomp_done_cond, &decomp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3906 | } |
| 3907 | } |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3908 | qemu_mutex_unlock(&decomp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3909 | } |
| 3910 | |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3911 | /* |
| 3912 | * colo cache: this is for secondary VM, we cache the whole |
| 3913 | * memory of the secondary VM, it is need to hold the global lock |
| 3914 | * to call this helper. |
| 3915 | */ |
| 3916 | int colo_init_ram_cache(void) |
| 3917 | { |
| 3918 | RAMBlock *block; |
| 3919 | |
Paolo Bonzini | 44901b5 | 2019-12-13 15:07:22 +0100 | [diff] [blame] | 3920 | WITH_RCU_READ_LOCK_GUARD() { |
| 3921 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
| 3922 | block->colo_cache = qemu_anon_ram_alloc(block->used_length, |
| 3923 | NULL, |
| 3924 | false); |
| 3925 | if (!block->colo_cache) { |
| 3926 | error_report("%s: Can't alloc memory for COLO cache of block %s," |
| 3927 | "size 0x" RAM_ADDR_FMT, __func__, block->idstr, |
| 3928 | block->used_length); |
| 3929 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
| 3930 | if (block->colo_cache) { |
| 3931 | qemu_anon_ram_free(block->colo_cache, block->used_length); |
| 3932 | block->colo_cache = NULL; |
| 3933 | } |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3934 | } |
Paolo Bonzini | 44901b5 | 2019-12-13 15:07:22 +0100 | [diff] [blame] | 3935 | return -errno; |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3936 | } |
Paolo Bonzini | 44901b5 | 2019-12-13 15:07:22 +0100 | [diff] [blame] | 3937 | memcpy(block->colo_cache, block->host, block->used_length); |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3938 | } |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3939 | } |
Paolo Bonzini | 44901b5 | 2019-12-13 15:07:22 +0100 | [diff] [blame] | 3940 | |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3941 | /* |
| 3942 | * Record the dirty pages that sent by PVM, we use this dirty bitmap together |
| 3943 | * with to decide which page in cache should be flushed into SVM's RAM. Here |
| 3944 | * we use the same name 'ram_bitmap' as for migration. |
| 3945 | */ |
| 3946 | if (ram_bytes_total()) { |
| 3947 | RAMBlock *block; |
| 3948 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3949 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3950 | unsigned long pages = block->max_length >> TARGET_PAGE_BITS; |
| 3951 | |
| 3952 | block->bmap = bitmap_new(pages); |
| 3953 | bitmap_set(block->bmap, 0, pages); |
| 3954 | } |
| 3955 | } |
| 3956 | ram_state = g_new0(RAMState, 1); |
| 3957 | ram_state->migration_dirty_pages = 0; |
Zhang Chen | c6e5baf | 2019-03-30 06:29:51 +0800 | [diff] [blame] | 3958 | qemu_mutex_init(&ram_state->bitmap_mutex); |
zhanghailiang | d1955d2 | 2018-09-03 12:38:55 +0800 | [diff] [blame] | 3959 | memory_global_dirty_log_start(); |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3960 | |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3961 | return 0; |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3962 | } |
| 3963 | |
| 3964 | /* It is need to hold the global lock to call this helper */ |
| 3965 | void colo_release_ram_cache(void) |
| 3966 | { |
| 3967 | RAMBlock *block; |
| 3968 | |
zhanghailiang | d1955d2 | 2018-09-03 12:38:55 +0800 | [diff] [blame] | 3969 | memory_global_dirty_log_stop(); |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3970 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3971 | g_free(block->bmap); |
| 3972 | block->bmap = NULL; |
| 3973 | } |
| 3974 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 3975 | WITH_RCU_READ_LOCK_GUARD() { |
| 3976 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
| 3977 | if (block->colo_cache) { |
| 3978 | qemu_anon_ram_free(block->colo_cache, block->used_length); |
| 3979 | block->colo_cache = NULL; |
| 3980 | } |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3981 | } |
| 3982 | } |
Zhang Chen | c6e5baf | 2019-03-30 06:29:51 +0800 | [diff] [blame] | 3983 | qemu_mutex_destroy(&ram_state->bitmap_mutex); |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3984 | g_free(ram_state); |
| 3985 | ram_state = NULL; |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3986 | } |
| 3987 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3988 | /** |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 3989 | * ram_load_setup: Setup RAM for migration incoming side |
| 3990 | * |
| 3991 | * Returns zero to indicate success and negative for error |
| 3992 | * |
| 3993 | * @f: QEMUFile where to receive the data |
| 3994 | * @opaque: RAMState pointer |
| 3995 | */ |
| 3996 | static int ram_load_setup(QEMUFile *f, void *opaque) |
| 3997 | { |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3998 | if (compress_threads_load_setup(f)) { |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3999 | return -1; |
| 4000 | } |
| 4001 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 4002 | xbzrle_load_setup(); |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 4003 | ramblock_recv_map_init(); |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 4004 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 4005 | return 0; |
| 4006 | } |
| 4007 | |
| 4008 | static int ram_load_cleanup(void *opaque) |
| 4009 | { |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 4010 | RAMBlock *rb; |
Junyan He | 56eb90a | 2018-07-18 15:48:03 +0800 | [diff] [blame] | 4011 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 4012 | RAMBLOCK_FOREACH_NOT_IGNORED(rb) { |
Beata Michalska | bd108a4 | 2019-11-21 00:08:42 +0000 | [diff] [blame] | 4013 | qemu_ram_block_writeback(rb); |
Junyan He | 56eb90a | 2018-07-18 15:48:03 +0800 | [diff] [blame] | 4014 | } |
| 4015 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 4016 | xbzrle_load_cleanup(); |
Juan Quintela | f0afa33 | 2017-06-28 11:52:28 +0200 | [diff] [blame] | 4017 | compress_threads_load_cleanup(); |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 4018 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 4019 | RAMBLOCK_FOREACH_NOT_IGNORED(rb) { |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 4020 | g_free(rb->receivedmap); |
| 4021 | rb->receivedmap = NULL; |
| 4022 | } |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 4023 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 4024 | return 0; |
| 4025 | } |
| 4026 | |
| 4027 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 4028 | * ram_postcopy_incoming_init: allocate postcopy data structures |
| 4029 | * |
| 4030 | * Returns 0 for success and negative if there was one error |
| 4031 | * |
| 4032 | * @mis: current migration incoming state |
| 4033 | * |
| 4034 | * Allocate data structures etc needed by incoming migration with |
| 4035 | * postcopy-ram. postcopy-ram's similarly names |
| 4036 | * postcopy_ram_incoming_init does the work. |
Dr. David Alan Gilbert | 1caddf8 | 2015-11-05 18:11:03 +0000 | [diff] [blame] | 4037 | */ |
| 4038 | int ram_postcopy_incoming_init(MigrationIncomingState *mis) |
| 4039 | { |
David Hildenbrand | c136180 | 2018-06-20 22:27:36 +0200 | [diff] [blame] | 4040 | return postcopy_ram_incoming_init(mis); |
Dr. David Alan Gilbert | 1caddf8 | 2015-11-05 18:11:03 +0000 | [diff] [blame] | 4041 | } |
| 4042 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 4043 | /** |
| 4044 | * ram_load_postcopy: load a page in postcopy case |
| 4045 | * |
| 4046 | * Returns 0 for success or -errno in case of error |
| 4047 | * |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4048 | * Called in postcopy mode by ram_load(). |
| 4049 | * rcu_read_lock is taken prior to this being called. |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 4050 | * |
| 4051 | * @f: QEMUFile where to send the data |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4052 | */ |
| 4053 | static int ram_load_postcopy(QEMUFile *f) |
| 4054 | { |
| 4055 | int flags = 0, ret = 0; |
| 4056 | bool place_needed = false; |
Peter Xu | 1aa8367 | 2018-07-10 17:18:53 +0800 | [diff] [blame] | 4057 | bool matches_target_page_size = false; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4058 | MigrationIncomingState *mis = migration_incoming_get_current(); |
| 4059 | /* Temporary page that is later 'placed' */ |
Wei Yang | 3414322 | 2019-10-05 21:50:20 +0800 | [diff] [blame] | 4060 | void *postcopy_host_page = mis->postcopy_tmp_page; |
Wei Yang | 91ba442 | 2019-11-07 20:39:06 +0800 | [diff] [blame] | 4061 | void *this_host = NULL; |
Dr. David Alan Gilbert | a3b6ff6 | 2015-11-11 14:02:28 +0000 | [diff] [blame] | 4062 | bool all_zero = false; |
Wei Yang | 4cbb3c6 | 2019-11-07 20:39:04 +0800 | [diff] [blame] | 4063 | int target_pages = 0; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4064 | |
| 4065 | while (!ret && !(flags & RAM_SAVE_FLAG_EOS)) { |
| 4066 | ram_addr_t addr; |
| 4067 | void *host = NULL; |
| 4068 | void *page_buffer = NULL; |
| 4069 | void *place_source = NULL; |
Dr. David Alan Gilbert | df9ff5e | 2017-02-24 18:28:35 +0000 | [diff] [blame] | 4070 | RAMBlock *block = NULL; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4071 | uint8_t ch; |
Wei Yang | 644acf9 | 2019-11-07 20:39:07 +0800 | [diff] [blame^] | 4072 | int len; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4073 | |
| 4074 | addr = qemu_get_be64(f); |
Peter Xu | 7a9ddfb | 2018-02-08 18:31:05 +0800 | [diff] [blame] | 4075 | |
| 4076 | /* |
| 4077 | * If qemu file error, we should stop here, and then "addr" |
| 4078 | * may be invalid |
| 4079 | */ |
| 4080 | ret = qemu_file_get_error(f); |
| 4081 | if (ret) { |
| 4082 | break; |
| 4083 | } |
| 4084 | |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4085 | flags = addr & ~TARGET_PAGE_MASK; |
| 4086 | addr &= TARGET_PAGE_MASK; |
| 4087 | |
| 4088 | trace_ram_load_postcopy_loop((uint64_t)addr, flags); |
| 4089 | place_needed = false; |
Wei Yang | 644acf9 | 2019-11-07 20:39:07 +0800 | [diff] [blame^] | 4090 | if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE | |
| 4091 | RAM_SAVE_FLAG_COMPRESS_PAGE)) { |
Dr. David Alan Gilbert | df9ff5e | 2017-02-24 18:28:35 +0000 | [diff] [blame] | 4092 | block = ram_block_from_stream(f, flags); |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 4093 | |
| 4094 | host = host_from_ram_block_offset(block, addr); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4095 | if (!host) { |
| 4096 | error_report("Illegal RAM offset " RAM_ADDR_FMT, addr); |
| 4097 | ret = -EINVAL; |
| 4098 | break; |
| 4099 | } |
Wei Yang | 4cbb3c6 | 2019-11-07 20:39:04 +0800 | [diff] [blame] | 4100 | target_pages++; |
Peter Xu | 1aa8367 | 2018-07-10 17:18:53 +0800 | [diff] [blame] | 4101 | matches_target_page_size = block->page_size == TARGET_PAGE_SIZE; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4102 | /* |
Dr. David Alan Gilbert | 28abd20 | 2017-02-24 18:28:37 +0000 | [diff] [blame] | 4103 | * Postcopy requires that we place whole host pages atomically; |
| 4104 | * these may be huge pages for RAMBlocks that are backed by |
| 4105 | * hugetlbfs. |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4106 | * To make it atomic, the data is read into a temporary page |
| 4107 | * that's moved into place later. |
| 4108 | * The migration protocol uses, possibly smaller, target-pages |
| 4109 | * however the source ensures it always sends all the components |
Wei Yang | 91ba442 | 2019-11-07 20:39:06 +0800 | [diff] [blame] | 4110 | * of a host page in one chunk. |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4111 | */ |
| 4112 | page_buffer = postcopy_host_page + |
Dr. David Alan Gilbert | 28abd20 | 2017-02-24 18:28:37 +0000 | [diff] [blame] | 4113 | ((uintptr_t)host & (block->page_size - 1)); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4114 | /* If all TP are zero then we can optimise the place */ |
Wei Yang | e5e73b0 | 2019-11-07 20:39:05 +0800 | [diff] [blame] | 4115 | if (target_pages == 1) { |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4116 | all_zero = true; |
Wei Yang | 91ba442 | 2019-11-07 20:39:06 +0800 | [diff] [blame] | 4117 | this_host = (void *)QEMU_ALIGN_DOWN((uintptr_t)host, |
| 4118 | block->page_size); |
Dr. David Alan Gilbert | c53b7dd | 2015-11-05 18:11:12 +0000 | [diff] [blame] | 4119 | } else { |
| 4120 | /* not the 1st TP within the HP */ |
Wei Yang | 91ba442 | 2019-11-07 20:39:06 +0800 | [diff] [blame] | 4121 | if (QEMU_ALIGN_DOWN((uintptr_t)host, block->page_size) != |
| 4122 | (uintptr_t)this_host) { |
| 4123 | error_report("Non-same host page %p/%p", |
| 4124 | host, this_host); |
Dr. David Alan Gilbert | c53b7dd | 2015-11-05 18:11:12 +0000 | [diff] [blame] | 4125 | ret = -EINVAL; |
| 4126 | break; |
| 4127 | } |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4128 | } |
| 4129 | |
| 4130 | /* |
| 4131 | * If it's the last part of a host page then we place the host |
| 4132 | * page |
| 4133 | */ |
Wei Yang | 4cbb3c6 | 2019-11-07 20:39:04 +0800 | [diff] [blame] | 4134 | if (target_pages == (block->page_size / TARGET_PAGE_SIZE)) { |
| 4135 | place_needed = true; |
| 4136 | target_pages = 0; |
| 4137 | } |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4138 | place_source = postcopy_host_page; |
| 4139 | } |
| 4140 | |
| 4141 | switch (flags & ~RAM_SAVE_FLAG_CONTINUE) { |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 4142 | case RAM_SAVE_FLAG_ZERO: |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4143 | ch = qemu_get_byte(f); |
Wei Yang | 2e36bc1 | 2019-11-07 20:39:02 +0800 | [diff] [blame] | 4144 | /* |
| 4145 | * Can skip to set page_buffer when |
| 4146 | * this is a zero page and (block->page_size == TARGET_PAGE_SIZE). |
| 4147 | */ |
| 4148 | if (ch || !matches_target_page_size) { |
| 4149 | memset(page_buffer, ch, TARGET_PAGE_SIZE); |
| 4150 | } |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4151 | if (ch) { |
| 4152 | all_zero = false; |
| 4153 | } |
| 4154 | break; |
| 4155 | |
| 4156 | case RAM_SAVE_FLAG_PAGE: |
| 4157 | all_zero = false; |
Peter Xu | 1aa8367 | 2018-07-10 17:18:53 +0800 | [diff] [blame] | 4158 | if (!matches_target_page_size) { |
| 4159 | /* For huge pages, we always use temporary buffer */ |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4160 | qemu_get_buffer(f, page_buffer, TARGET_PAGE_SIZE); |
| 4161 | } else { |
Peter Xu | 1aa8367 | 2018-07-10 17:18:53 +0800 | [diff] [blame] | 4162 | /* |
| 4163 | * For small pages that matches target page size, we |
| 4164 | * avoid the qemu_file copy. Instead we directly use |
| 4165 | * the buffer of QEMUFile to place the page. Note: we |
| 4166 | * cannot do any QEMUFile operation before using that |
| 4167 | * buffer to make sure the buffer is valid when |
| 4168 | * placing the page. |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4169 | */ |
| 4170 | qemu_get_buffer_in_place(f, (uint8_t **)&place_source, |
| 4171 | TARGET_PAGE_SIZE); |
| 4172 | } |
| 4173 | break; |
Wei Yang | 644acf9 | 2019-11-07 20:39:07 +0800 | [diff] [blame^] | 4174 | case RAM_SAVE_FLAG_COMPRESS_PAGE: |
| 4175 | all_zero = false; |
| 4176 | len = qemu_get_be32(f); |
| 4177 | if (len < 0 || len > compressBound(TARGET_PAGE_SIZE)) { |
| 4178 | error_report("Invalid compressed data length: %d", len); |
| 4179 | ret = -EINVAL; |
| 4180 | break; |
| 4181 | } |
| 4182 | decompress_data_with_multi_threads(f, page_buffer, len); |
| 4183 | break; |
| 4184 | |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4185 | case RAM_SAVE_FLAG_EOS: |
| 4186 | /* normal exit */ |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 4187 | multifd_recv_sync_main(); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4188 | break; |
| 4189 | default: |
| 4190 | error_report("Unknown combination of migration flags: %#x" |
| 4191 | " (postcopy mode)", flags); |
| 4192 | ret = -EINVAL; |
Peter Xu | 7a9ddfb | 2018-02-08 18:31:05 +0800 | [diff] [blame] | 4193 | break; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4194 | } |
| 4195 | |
Wei Yang | 644acf9 | 2019-11-07 20:39:07 +0800 | [diff] [blame^] | 4196 | /* Got the whole host page, wait for decompress before placing. */ |
| 4197 | if (place_needed) { |
| 4198 | ret |= wait_for_decompress_done(); |
| 4199 | } |
| 4200 | |
Peter Xu | 7a9ddfb | 2018-02-08 18:31:05 +0800 | [diff] [blame] | 4201 | /* Detect for any possible file errors */ |
| 4202 | if (!ret && qemu_file_get_error(f)) { |
| 4203 | ret = qemu_file_get_error(f); |
| 4204 | } |
| 4205 | |
| 4206 | if (!ret && place_needed) { |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4207 | /* This gets called at the last target page in the host page */ |
Wei Yang | 91ba442 | 2019-11-07 20:39:06 +0800 | [diff] [blame] | 4208 | void *place_dest = (void *)QEMU_ALIGN_DOWN((uintptr_t)host, |
| 4209 | block->page_size); |
Dr. David Alan Gilbert | df9ff5e | 2017-02-24 18:28:35 +0000 | [diff] [blame] | 4210 | |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4211 | if (all_zero) { |
Dr. David Alan Gilbert | df9ff5e | 2017-02-24 18:28:35 +0000 | [diff] [blame] | 4212 | ret = postcopy_place_page_zero(mis, place_dest, |
Alexey Perevalov | 8be4620 | 2017-10-05 14:13:18 +0300 | [diff] [blame] | 4213 | block); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4214 | } else { |
Dr. David Alan Gilbert | df9ff5e | 2017-02-24 18:28:35 +0000 | [diff] [blame] | 4215 | ret = postcopy_place_page(mis, place_dest, |
Alexey Perevalov | 8be4620 | 2017-10-05 14:13:18 +0300 | [diff] [blame] | 4216 | place_source, block); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4217 | } |
| 4218 | } |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4219 | } |
| 4220 | |
| 4221 | return ret; |
| 4222 | } |
| 4223 | |
Daniel Henrique Barboza | acab30b | 2017-11-16 20:35:26 -0200 | [diff] [blame] | 4224 | static bool postcopy_is_advised(void) |
| 4225 | { |
| 4226 | PostcopyState ps = postcopy_state_get(); |
| 4227 | return ps >= POSTCOPY_INCOMING_ADVISE && ps < POSTCOPY_INCOMING_END; |
| 4228 | } |
| 4229 | |
| 4230 | static bool postcopy_is_running(void) |
| 4231 | { |
| 4232 | PostcopyState ps = postcopy_state_get(); |
| 4233 | return ps >= POSTCOPY_INCOMING_LISTENING && ps < POSTCOPY_INCOMING_END; |
| 4234 | } |
| 4235 | |
Zhang Chen | e6f4aa1 | 2018-09-03 12:38:50 +0800 | [diff] [blame] | 4236 | /* |
| 4237 | * Flush content of RAM cache into SVM's memory. |
| 4238 | * Only flush the pages that be dirtied by PVM or SVM or both. |
| 4239 | */ |
| 4240 | static void colo_flush_ram_cache(void) |
| 4241 | { |
| 4242 | RAMBlock *block = NULL; |
| 4243 | void *dst_host; |
| 4244 | void *src_host; |
| 4245 | unsigned long offset = 0; |
| 4246 | |
zhanghailiang | d1955d2 | 2018-09-03 12:38:55 +0800 | [diff] [blame] | 4247 | memory_global_dirty_log_sync(); |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 4248 | WITH_RCU_READ_LOCK_GUARD() { |
| 4249 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
| 4250 | ramblock_sync_dirty_bitmap(ram_state, block); |
Zhang Chen | e6f4aa1 | 2018-09-03 12:38:50 +0800 | [diff] [blame] | 4251 | } |
| 4252 | } |
| 4253 | |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 4254 | trace_colo_flush_ram_cache_begin(ram_state->migration_dirty_pages); |
| 4255 | WITH_RCU_READ_LOCK_GUARD() { |
| 4256 | block = QLIST_FIRST_RCU(&ram_list.blocks); |
| 4257 | |
| 4258 | while (block) { |
| 4259 | offset = migration_bitmap_find_dirty(ram_state, block, offset); |
| 4260 | |
| 4261 | if (offset << TARGET_PAGE_BITS >= block->used_length) { |
| 4262 | offset = 0; |
| 4263 | block = QLIST_NEXT_RCU(block, next); |
| 4264 | } else { |
| 4265 | migration_bitmap_clear_dirty(ram_state, block, offset); |
| 4266 | dst_host = block->host + (offset << TARGET_PAGE_BITS); |
| 4267 | src_host = block->colo_cache + (offset << TARGET_PAGE_BITS); |
| 4268 | memcpy(dst_host, src_host, TARGET_PAGE_SIZE); |
| 4269 | } |
| 4270 | } |
| 4271 | } |
Zhang Chen | e6f4aa1 | 2018-09-03 12:38:50 +0800 | [diff] [blame] | 4272 | trace_colo_flush_ram_cache_end(); |
| 4273 | } |
| 4274 | |
Wei Yang | 10da4a3 | 2019-07-25 08:20:23 +0800 | [diff] [blame] | 4275 | /** |
| 4276 | * ram_load_precopy: load pages in precopy case |
| 4277 | * |
| 4278 | * Returns 0 for success or -errno in case of error |
| 4279 | * |
| 4280 | * Called in precopy mode by ram_load(). |
| 4281 | * rcu_read_lock is taken prior to this being called. |
| 4282 | * |
| 4283 | * @f: QEMUFile where to send the data |
| 4284 | */ |
| 4285 | static int ram_load_precopy(QEMUFile *f) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4286 | { |
Yury Kotov | e65cec5 | 2019-11-25 16:36:32 +0300 | [diff] [blame] | 4287 | int flags = 0, ret = 0, invalid_flags = 0, len = 0, i = 0; |
Dr. David Alan Gilbert | ef08fb3 | 2017-02-24 18:28:30 +0000 | [diff] [blame] | 4288 | /* ADVISE is earlier, it shows the source has the postcopy capability on */ |
Daniel Henrique Barboza | acab30b | 2017-11-16 20:35:26 -0200 | [diff] [blame] | 4289 | bool postcopy_advised = postcopy_is_advised(); |
Juan Quintela | edc6012 | 2016-11-02 12:40:46 +0100 | [diff] [blame] | 4290 | if (!migrate_use_compression()) { |
| 4291 | invalid_flags |= RAM_SAVE_FLAG_COMPRESS_PAGE; |
| 4292 | } |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4293 | |
Wei Yang | 10da4a3 | 2019-07-25 08:20:23 +0800 | [diff] [blame] | 4294 | while (!ret && !(flags & RAM_SAVE_FLAG_EOS)) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4295 | ram_addr_t addr, total_ram_bytes; |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4296 | void *host = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4297 | uint8_t ch; |
| 4298 | |
Yury Kotov | e65cec5 | 2019-11-25 16:36:32 +0300 | [diff] [blame] | 4299 | /* |
| 4300 | * Yield periodically to let main loop run, but an iteration of |
| 4301 | * the main loop is expensive, so do it each some iterations |
| 4302 | */ |
| 4303 | if ((i & 32767) == 0 && qemu_in_coroutine()) { |
| 4304 | aio_co_schedule(qemu_get_current_aio_context(), |
| 4305 | qemu_coroutine_self()); |
| 4306 | qemu_coroutine_yield(); |
| 4307 | } |
| 4308 | i++; |
| 4309 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4310 | addr = qemu_get_be64(f); |
| 4311 | flags = addr & ~TARGET_PAGE_MASK; |
| 4312 | addr &= TARGET_PAGE_MASK; |
| 4313 | |
Juan Quintela | edc6012 | 2016-11-02 12:40:46 +0100 | [diff] [blame] | 4314 | if (flags & invalid_flags) { |
| 4315 | if (flags & invalid_flags & RAM_SAVE_FLAG_COMPRESS_PAGE) { |
| 4316 | error_report("Received an unexpected compressed page"); |
| 4317 | } |
| 4318 | |
| 4319 | ret = -EINVAL; |
| 4320 | break; |
| 4321 | } |
| 4322 | |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 4323 | if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE | |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4324 | RAM_SAVE_FLAG_COMPRESS_PAGE | RAM_SAVE_FLAG_XBZRLE)) { |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 4325 | RAMBlock *block = ram_block_from_stream(f, flags); |
| 4326 | |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 4327 | /* |
| 4328 | * After going into COLO, we should load the Page into colo_cache. |
| 4329 | */ |
| 4330 | if (migration_incoming_in_colo_state()) { |
| 4331 | host = colo_cache_from_block_offset(block, addr); |
| 4332 | } else { |
| 4333 | host = host_from_ram_block_offset(block, addr); |
| 4334 | } |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4335 | if (!host) { |
| 4336 | error_report("Illegal RAM offset " RAM_ADDR_FMT, addr); |
| 4337 | ret = -EINVAL; |
| 4338 | break; |
| 4339 | } |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 4340 | |
| 4341 | if (!migration_incoming_in_colo_state()) { |
| 4342 | ramblock_recv_bitmap_set(block, host); |
| 4343 | } |
| 4344 | |
Dr. David Alan Gilbert | 1db9d8e | 2017-04-26 19:37:21 +0100 | [diff] [blame] | 4345 | trace_ram_load_loop(block->idstr, (uint64_t)addr, flags, host); |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4346 | } |
| 4347 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4348 | switch (flags & ~RAM_SAVE_FLAG_CONTINUE) { |
| 4349 | case RAM_SAVE_FLAG_MEM_SIZE: |
| 4350 | /* Synchronize RAM block list */ |
| 4351 | total_ram_bytes = addr; |
| 4352 | while (!ret && total_ram_bytes) { |
| 4353 | RAMBlock *block; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4354 | char id[256]; |
| 4355 | ram_addr_t length; |
| 4356 | |
| 4357 | len = qemu_get_byte(f); |
| 4358 | qemu_get_buffer(f, (uint8_t *)id, len); |
| 4359 | id[len] = 0; |
| 4360 | length = qemu_get_be64(f); |
| 4361 | |
Dr. David Alan Gilbert | e3dd749 | 2015-11-05 18:10:33 +0000 | [diff] [blame] | 4362 | block = qemu_ram_block_by_name(id); |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 4363 | if (block && !qemu_ram_is_migratable(block)) { |
| 4364 | error_report("block %s should not be migrated !", id); |
| 4365 | ret = -EINVAL; |
| 4366 | } else if (block) { |
Dr. David Alan Gilbert | e3dd749 | 2015-11-05 18:10:33 +0000 | [diff] [blame] | 4367 | if (length != block->used_length) { |
| 4368 | Error *local_err = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4369 | |
Gonglei | fa53a0e | 2016-05-10 10:04:59 +0800 | [diff] [blame] | 4370 | ret = qemu_ram_resize(block, length, |
Dr. David Alan Gilbert | e3dd749 | 2015-11-05 18:10:33 +0000 | [diff] [blame] | 4371 | &local_err); |
| 4372 | if (local_err) { |
| 4373 | error_report_err(local_err); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4374 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4375 | } |
Dr. David Alan Gilbert | ef08fb3 | 2017-02-24 18:28:30 +0000 | [diff] [blame] | 4376 | /* For postcopy we need to check hugepage sizes match */ |
| 4377 | if (postcopy_advised && |
| 4378 | block->page_size != qemu_host_page_size) { |
| 4379 | uint64_t remote_page_size = qemu_get_be64(f); |
| 4380 | if (remote_page_size != block->page_size) { |
| 4381 | error_report("Mismatched RAM page size %s " |
| 4382 | "(local) %zd != %" PRId64, |
| 4383 | id, block->page_size, |
| 4384 | remote_page_size); |
| 4385 | ret = -EINVAL; |
| 4386 | } |
| 4387 | } |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 4388 | if (migrate_ignore_shared()) { |
| 4389 | hwaddr addr = qemu_get_be64(f); |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 4390 | if (ramblock_is_ignored(block) && |
| 4391 | block->mr->addr != addr) { |
| 4392 | error_report("Mismatched GPAs for block %s " |
| 4393 | "%" PRId64 "!= %" PRId64, |
| 4394 | id, (uint64_t)addr, |
| 4395 | (uint64_t)block->mr->addr); |
| 4396 | ret = -EINVAL; |
| 4397 | } |
| 4398 | } |
Dr. David Alan Gilbert | e3dd749 | 2015-11-05 18:10:33 +0000 | [diff] [blame] | 4399 | ram_control_load_hook(f, RAM_CONTROL_BLOCK_REG, |
| 4400 | block->idstr); |
| 4401 | } else { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4402 | error_report("Unknown ramblock \"%s\", cannot " |
| 4403 | "accept migration", id); |
| 4404 | ret = -EINVAL; |
| 4405 | } |
| 4406 | |
| 4407 | total_ram_bytes -= length; |
| 4408 | } |
| 4409 | break; |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4410 | |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 4411 | case RAM_SAVE_FLAG_ZERO: |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4412 | ch = qemu_get_byte(f); |
| 4413 | ram_handle_compressed(host, ch, TARGET_PAGE_SIZE); |
| 4414 | break; |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4415 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4416 | case RAM_SAVE_FLAG_PAGE: |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4417 | qemu_get_buffer(f, host, TARGET_PAGE_SIZE); |
| 4418 | break; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4419 | |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4420 | case RAM_SAVE_FLAG_COMPRESS_PAGE: |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4421 | len = qemu_get_be32(f); |
| 4422 | if (len < 0 || len > compressBound(TARGET_PAGE_SIZE)) { |
| 4423 | error_report("Invalid compressed data length: %d", len); |
| 4424 | ret = -EINVAL; |
| 4425 | break; |
| 4426 | } |
Dr. David Alan Gilbert | c1bc662 | 2015-12-16 11:47:38 +0000 | [diff] [blame] | 4427 | decompress_data_with_multi_threads(f, host, len); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4428 | break; |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4429 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4430 | case RAM_SAVE_FLAG_XBZRLE: |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4431 | if (load_xbzrle(f, addr, host) < 0) { |
| 4432 | error_report("Failed to decompress XBZRLE page at " |
| 4433 | RAM_ADDR_FMT, addr); |
| 4434 | ret = -EINVAL; |
| 4435 | break; |
| 4436 | } |
| 4437 | break; |
| 4438 | case RAM_SAVE_FLAG_EOS: |
| 4439 | /* normal exit */ |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 4440 | multifd_recv_sync_main(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4441 | break; |
| 4442 | default: |
| 4443 | if (flags & RAM_SAVE_FLAG_HOOK) { |
Dr. David Alan Gilbert | 632e3a5 | 2015-06-11 18:17:23 +0100 | [diff] [blame] | 4444 | ram_control_load_hook(f, RAM_CONTROL_HOOK, NULL); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4445 | } else { |
| 4446 | error_report("Unknown combination of migration flags: %#x", |
| 4447 | flags); |
| 4448 | ret = -EINVAL; |
| 4449 | } |
| 4450 | } |
| 4451 | if (!ret) { |
| 4452 | ret = qemu_file_get_error(f); |
| 4453 | } |
| 4454 | } |
| 4455 | |
Wei Yang | ca1a6b7 | 2019-11-07 20:39:03 +0800 | [diff] [blame] | 4456 | ret |= wait_for_decompress_done(); |
Wei Yang | 10da4a3 | 2019-07-25 08:20:23 +0800 | [diff] [blame] | 4457 | return ret; |
| 4458 | } |
| 4459 | |
| 4460 | static int ram_load(QEMUFile *f, void *opaque, int version_id) |
| 4461 | { |
| 4462 | int ret = 0; |
| 4463 | static uint64_t seq_iter; |
| 4464 | /* |
| 4465 | * If system is running in postcopy mode, page inserts to host memory must |
| 4466 | * be atomic |
| 4467 | */ |
| 4468 | bool postcopy_running = postcopy_is_running(); |
| 4469 | |
| 4470 | seq_iter++; |
| 4471 | |
| 4472 | if (version_id != 4) { |
| 4473 | return -EINVAL; |
| 4474 | } |
| 4475 | |
| 4476 | /* |
| 4477 | * This RCU critical section can be very long running. |
| 4478 | * When RCU reclaims in the code start to become numerous, |
| 4479 | * it will be necessary to reduce the granularity of this |
| 4480 | * critical section. |
| 4481 | */ |
Dr. David Alan Gilbert | 89ac5a1 | 2019-10-07 15:36:39 +0100 | [diff] [blame] | 4482 | WITH_RCU_READ_LOCK_GUARD() { |
| 4483 | if (postcopy_running) { |
| 4484 | ret = ram_load_postcopy(f); |
| 4485 | } else { |
| 4486 | ret = ram_load_precopy(f); |
| 4487 | } |
Wei Yang | 10da4a3 | 2019-07-25 08:20:23 +0800 | [diff] [blame] | 4488 | } |
Juan Quintela | 55c4446 | 2017-01-23 22:32:05 +0100 | [diff] [blame] | 4489 | trace_ram_load_complete(ret, seq_iter); |
Zhang Chen | e6f4aa1 | 2018-09-03 12:38:50 +0800 | [diff] [blame] | 4490 | |
| 4491 | if (!ret && migration_incoming_in_colo_state()) { |
| 4492 | colo_flush_ram_cache(); |
| 4493 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4494 | return ret; |
| 4495 | } |
| 4496 | |
Vladimir Sementsov-Ogievskiy | c646762 | 2017-07-10 19:30:14 +0300 | [diff] [blame] | 4497 | static bool ram_has_postcopy(void *opaque) |
| 4498 | { |
Junyan He | 469dd51 | 2018-07-18 15:48:02 +0800 | [diff] [blame] | 4499 | RAMBlock *rb; |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 4500 | RAMBLOCK_FOREACH_NOT_IGNORED(rb) { |
Junyan He | 469dd51 | 2018-07-18 15:48:02 +0800 | [diff] [blame] | 4501 | if (ramblock_is_pmem(rb)) { |
| 4502 | info_report("Block: %s, host: %p is a nvdimm memory, postcopy" |
| 4503 | "is not supported now!", rb->idstr, rb->host); |
| 4504 | return false; |
| 4505 | } |
| 4506 | } |
| 4507 | |
Vladimir Sementsov-Ogievskiy | c646762 | 2017-07-10 19:30:14 +0300 | [diff] [blame] | 4508 | return migrate_postcopy_ram(); |
| 4509 | } |
| 4510 | |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4511 | /* Sync all the dirty bitmap with destination VM. */ |
| 4512 | static int ram_dirty_bitmap_sync_all(MigrationState *s, RAMState *rs) |
| 4513 | { |
| 4514 | RAMBlock *block; |
| 4515 | QEMUFile *file = s->to_dst_file; |
| 4516 | int ramblock_count = 0; |
| 4517 | |
| 4518 | trace_ram_dirty_bitmap_sync_start(); |
| 4519 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 4520 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4521 | qemu_savevm_send_recv_bitmap(file, block->idstr); |
| 4522 | trace_ram_dirty_bitmap_request(block->idstr); |
| 4523 | ramblock_count++; |
| 4524 | } |
| 4525 | |
| 4526 | trace_ram_dirty_bitmap_sync_wait(); |
| 4527 | |
| 4528 | /* Wait until all the ramblocks' dirty bitmap synced */ |
| 4529 | while (ramblock_count--) { |
| 4530 | qemu_sem_wait(&s->rp_state.rp_sem); |
| 4531 | } |
| 4532 | |
| 4533 | trace_ram_dirty_bitmap_sync_complete(); |
| 4534 | |
| 4535 | return 0; |
| 4536 | } |
| 4537 | |
| 4538 | static void ram_dirty_bitmap_reload_notify(MigrationState *s) |
| 4539 | { |
| 4540 | qemu_sem_post(&s->rp_state.rp_sem); |
| 4541 | } |
| 4542 | |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 4543 | /* |
| 4544 | * Read the received bitmap, revert it as the initial dirty bitmap. |
| 4545 | * This is only used when the postcopy migration is paused but wants |
| 4546 | * to resume from a middle point. |
| 4547 | */ |
| 4548 | int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *block) |
| 4549 | { |
| 4550 | int ret = -EINVAL; |
| 4551 | QEMUFile *file = s->rp_state.from_dst_file; |
| 4552 | unsigned long *le_bitmap, nbits = block->used_length >> TARGET_PAGE_BITS; |
Peter Xu | a725ef9 | 2018-07-10 17:18:55 +0800 | [diff] [blame] | 4553 | uint64_t local_size = DIV_ROUND_UP(nbits, 8); |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 4554 | uint64_t size, end_mark; |
| 4555 | |
| 4556 | trace_ram_dirty_bitmap_reload_begin(block->idstr); |
| 4557 | |
| 4558 | if (s->state != MIGRATION_STATUS_POSTCOPY_RECOVER) { |
| 4559 | error_report("%s: incorrect state %s", __func__, |
| 4560 | MigrationStatus_str(s->state)); |
| 4561 | return -EINVAL; |
| 4562 | } |
| 4563 | |
| 4564 | /* |
| 4565 | * Note: see comments in ramblock_recv_bitmap_send() on why we |
| 4566 | * need the endianess convertion, and the paddings. |
| 4567 | */ |
| 4568 | local_size = ROUND_UP(local_size, 8); |
| 4569 | |
| 4570 | /* Add paddings */ |
| 4571 | le_bitmap = bitmap_new(nbits + BITS_PER_LONG); |
| 4572 | |
| 4573 | size = qemu_get_be64(file); |
| 4574 | |
| 4575 | /* The size of the bitmap should match with our ramblock */ |
| 4576 | if (size != local_size) { |
| 4577 | error_report("%s: ramblock '%s' bitmap size mismatch " |
| 4578 | "(0x%"PRIx64" != 0x%"PRIx64")", __func__, |
| 4579 | block->idstr, size, local_size); |
| 4580 | ret = -EINVAL; |
| 4581 | goto out; |
| 4582 | } |
| 4583 | |
| 4584 | size = qemu_get_buffer(file, (uint8_t *)le_bitmap, local_size); |
| 4585 | end_mark = qemu_get_be64(file); |
| 4586 | |
| 4587 | ret = qemu_file_get_error(file); |
| 4588 | if (ret || size != local_size) { |
| 4589 | error_report("%s: read bitmap failed for ramblock '%s': %d" |
| 4590 | " (size 0x%"PRIx64", got: 0x%"PRIx64")", |
| 4591 | __func__, block->idstr, ret, local_size, size); |
| 4592 | ret = -EIO; |
| 4593 | goto out; |
| 4594 | } |
| 4595 | |
| 4596 | if (end_mark != RAMBLOCK_RECV_BITMAP_ENDING) { |
| 4597 | error_report("%s: ramblock '%s' end mark incorrect: 0x%"PRIu64, |
| 4598 | __func__, block->idstr, end_mark); |
| 4599 | ret = -EINVAL; |
| 4600 | goto out; |
| 4601 | } |
| 4602 | |
| 4603 | /* |
| 4604 | * Endianess convertion. We are during postcopy (though paused). |
| 4605 | * The dirty bitmap won't change. We can directly modify it. |
| 4606 | */ |
| 4607 | bitmap_from_le(block->bmap, le_bitmap, nbits); |
| 4608 | |
| 4609 | /* |
| 4610 | * What we received is "received bitmap". Revert it as the initial |
| 4611 | * dirty bitmap for this ramblock. |
| 4612 | */ |
| 4613 | bitmap_complement(block->bmap, block->bmap, nbits); |
| 4614 | |
| 4615 | trace_ram_dirty_bitmap_reload_complete(block->idstr); |
| 4616 | |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4617 | /* |
| 4618 | * We succeeded to sync bitmap for current ramblock. If this is |
| 4619 | * the last one to sync, we need to notify the main send thread. |
| 4620 | */ |
| 4621 | ram_dirty_bitmap_reload_notify(s); |
| 4622 | |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 4623 | ret = 0; |
| 4624 | out: |
Peter Xu | bf26990 | 2018-05-25 09:50:42 +0800 | [diff] [blame] | 4625 | g_free(le_bitmap); |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 4626 | return ret; |
| 4627 | } |
| 4628 | |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4629 | static int ram_resume_prepare(MigrationState *s, void *opaque) |
| 4630 | { |
| 4631 | RAMState *rs = *(RAMState **)opaque; |
Peter Xu | 08614f3 | 2018-05-02 18:47:33 +0800 | [diff] [blame] | 4632 | int ret; |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4633 | |
Peter Xu | 08614f3 | 2018-05-02 18:47:33 +0800 | [diff] [blame] | 4634 | ret = ram_dirty_bitmap_sync_all(s, rs); |
| 4635 | if (ret) { |
| 4636 | return ret; |
| 4637 | } |
| 4638 | |
| 4639 | ram_state_resume_prepare(rs, s->to_dst_file); |
| 4640 | |
| 4641 | return 0; |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4642 | } |
| 4643 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4644 | static SaveVMHandlers savevm_ram_handlers = { |
Juan Quintela | 9907e84 | 2017-06-28 11:52:24 +0200 | [diff] [blame] | 4645 | .save_setup = ram_save_setup, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4646 | .save_live_iterate = ram_save_iterate, |
Dr. David Alan Gilbert | 763c906 | 2015-11-05 18:11:00 +0000 | [diff] [blame] | 4647 | .save_live_complete_postcopy = ram_save_complete, |
Dr. David Alan Gilbert | a3e06c3 | 2015-11-05 18:10:41 +0000 | [diff] [blame] | 4648 | .save_live_complete_precopy = ram_save_complete, |
Vladimir Sementsov-Ogievskiy | c646762 | 2017-07-10 19:30:14 +0300 | [diff] [blame] | 4649 | .has_postcopy = ram_has_postcopy, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4650 | .save_live_pending = ram_save_pending, |
| 4651 | .load_state = ram_load, |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 4652 | .save_cleanup = ram_save_cleanup, |
| 4653 | .load_setup = ram_load_setup, |
| 4654 | .load_cleanup = ram_load_cleanup, |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4655 | .resume_prepare = ram_resume_prepare, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4656 | }; |
| 4657 | |
| 4658 | void ram_mig_init(void) |
| 4659 | { |
| 4660 | qemu_mutex_init(&XBZRLE.lock); |
Dr. David Alan Gilbert | ce62df5 | 2019-08-22 12:54:33 +0100 | [diff] [blame] | 4661 | register_savevm_live("ram", 0, 4, &savevm_ram_handlers, &ram_state); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4662 | } |