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" |
Junyan He | 56eb90a | 2018-07-18 15:48:03 +0800 | [diff] [blame] | 36 | #include "qemu/pmem.h" |
Juan Quintela | 709e3fe | 2017-04-05 21:47:50 +0200 | [diff] [blame] | 37 | #include "xbzrle.h" |
Juan Quintela | 7b1e1a2 | 2017-04-17 20:26:27 +0200 | [diff] [blame] | 38 | #include "ram.h" |
Juan Quintela | 6666c96 | 2017-04-24 20:07:27 +0200 | [diff] [blame] | 39 | #include "migration.h" |
Juan Quintela | 71bb07d | 2018-02-19 19:01:03 +0100 | [diff] [blame] | 40 | #include "socket.h" |
Juan Quintela | f2a8f0a | 2017-04-24 13:42:55 +0200 | [diff] [blame] | 41 | #include "migration/register.h" |
Juan Quintela | 7b1e1a2 | 2017-04-17 20:26:27 +0200 | [diff] [blame] | 42 | #include "migration/misc.h" |
Juan Quintela | 08a0aee | 2017-04-20 18:52:18 +0200 | [diff] [blame] | 43 | #include "qemu-file.h" |
Juan Quintela | be07b0a | 2017-04-20 13:12:24 +0200 | [diff] [blame] | 44 | #include "postcopy-ram.h" |
Michael S. Tsirkin | 53d37d3 | 2018-05-03 22:50:51 +0300 | [diff] [blame] | 45 | #include "page_cache.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 46 | #include "qemu/error-report.h" |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 47 | #include "qapi/error.h" |
Markus Armbruster | 9af2398 | 2018-02-11 10:36:01 +0100 | [diff] [blame] | 48 | #include "qapi/qapi-events-migration.h" |
Juan Quintela | 8acabf6 | 2017-10-05 22:00:31 +0200 | [diff] [blame] | 49 | #include "qapi/qmp/qerror.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 50 | #include "trace.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 51 | #include "exec/ram_addr.h" |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 52 | #include "exec/target_page.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 53 | #include "qemu/rcu_queue.h" |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 54 | #include "migration/colo.h" |
Michael S. Tsirkin | 53d37d3 | 2018-05-03 22:50:51 +0300 | [diff] [blame] | 55 | #include "block.h" |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 56 | #include "sysemu/sysemu.h" |
| 57 | #include "qemu/uuid.h" |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 58 | #include "savevm.h" |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 59 | #include "qemu/iov.h" |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 60 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 61 | /***********************************************************/ |
| 62 | /* ram save/restore */ |
| 63 | |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 64 | /* RAM_SAVE_FLAG_ZERO used to be named RAM_SAVE_FLAG_COMPRESS, it |
| 65 | * worked for pages that where filled with the same char. We switched |
| 66 | * it to only search for the zero value. And to avoid confusion with |
| 67 | * RAM_SSAVE_FLAG_COMPRESS_PAGE just rename it. |
| 68 | */ |
| 69 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 70 | #define RAM_SAVE_FLAG_FULL 0x01 /* Obsolete, not used anymore */ |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 71 | #define RAM_SAVE_FLAG_ZERO 0x02 |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 72 | #define RAM_SAVE_FLAG_MEM_SIZE 0x04 |
| 73 | #define RAM_SAVE_FLAG_PAGE 0x08 |
| 74 | #define RAM_SAVE_FLAG_EOS 0x10 |
| 75 | #define RAM_SAVE_FLAG_CONTINUE 0x20 |
| 76 | #define RAM_SAVE_FLAG_XBZRLE 0x40 |
| 77 | /* 0x80 is reserved in migration.h start with 0x100 next */ |
| 78 | #define RAM_SAVE_FLAG_COMPRESS_PAGE 0x100 |
| 79 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 80 | static inline bool is_zero_range(uint8_t *p, uint64_t size) |
| 81 | { |
Richard Henderson | a1febc4 | 2016-08-29 11:46:14 -0700 | [diff] [blame] | 82 | return buffer_is_zero(p, size); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 83 | } |
| 84 | |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 85 | XBZRLECacheStats xbzrle_counters; |
| 86 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 87 | /* struct contains XBZRLE cache and a static page |
| 88 | used by the compression */ |
| 89 | static struct { |
| 90 | /* buffer used for XBZRLE encoding */ |
| 91 | uint8_t *encoded_buf; |
| 92 | /* buffer for storing page content */ |
| 93 | uint8_t *current_buf; |
| 94 | /* Cache for XBZRLE, Protected by lock. */ |
| 95 | PageCache *cache; |
| 96 | QemuMutex lock; |
Juan Quintela | c00e092 | 2017-05-09 16:22:01 +0200 | [diff] [blame] | 97 | /* it will store a page full of zeros */ |
| 98 | uint8_t *zero_target_page; |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 99 | /* buffer used for XBZRLE decoding */ |
| 100 | uint8_t *decoded_buf; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 101 | } XBZRLE; |
| 102 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 103 | static void XBZRLE_cache_lock(void) |
| 104 | { |
| 105 | if (migrate_use_xbzrle()) |
| 106 | qemu_mutex_lock(&XBZRLE.lock); |
| 107 | } |
| 108 | |
| 109 | static void XBZRLE_cache_unlock(void) |
| 110 | { |
| 111 | if (migrate_use_xbzrle()) |
| 112 | qemu_mutex_unlock(&XBZRLE.lock); |
| 113 | } |
| 114 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 115 | /** |
| 116 | * xbzrle_cache_resize: resize the xbzrle cache |
| 117 | * |
| 118 | * This function is called from qmp_migrate_set_cache_size in main |
| 119 | * thread, possibly while a migration is in progress. A running |
| 120 | * migration may be using the cache and might finish during this call, |
| 121 | * hence changes to the cache are protected by XBZRLE.lock(). |
| 122 | * |
Juan Quintela | c9dede2 | 2017-10-06 23:03:55 +0200 | [diff] [blame] | 123 | * Returns 0 for success or -1 for error |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 124 | * |
| 125 | * @new_size: new cache size |
Juan Quintela | 8acabf6 | 2017-10-05 22:00:31 +0200 | [diff] [blame] | 126 | * @errp: set *errp if the check failed, with reason |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 127 | */ |
Juan Quintela | c9dede2 | 2017-10-06 23:03:55 +0200 | [diff] [blame] | 128 | int xbzrle_cache_resize(int64_t new_size, Error **errp) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 129 | { |
| 130 | PageCache *new_cache; |
Juan Quintela | c9dede2 | 2017-10-06 23:03:55 +0200 | [diff] [blame] | 131 | int64_t ret = 0; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 132 | |
Juan Quintela | 8acabf6 | 2017-10-05 22:00:31 +0200 | [diff] [blame] | 133 | /* Check for truncation */ |
| 134 | if (new_size != (size_t)new_size) { |
| 135 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", |
| 136 | "exceeding address space"); |
| 137 | return -1; |
| 138 | } |
| 139 | |
Juan Quintela | 2a313e5 | 2017-10-06 23:00:12 +0200 | [diff] [blame] | 140 | if (new_size == migrate_xbzrle_cache_size()) { |
| 141 | /* nothing to do */ |
Juan Quintela | c9dede2 | 2017-10-06 23:03:55 +0200 | [diff] [blame] | 142 | return 0; |
Juan Quintela | 2a313e5 | 2017-10-06 23:00:12 +0200 | [diff] [blame] | 143 | } |
| 144 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 145 | XBZRLE_cache_lock(); |
| 146 | |
| 147 | if (XBZRLE.cache != NULL) { |
Juan Quintela | 80f8dfd | 2017-10-06 22:30:45 +0200 | [diff] [blame] | 148 | new_cache = cache_init(new_size, TARGET_PAGE_SIZE, errp); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 149 | if (!new_cache) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 150 | ret = -1; |
| 151 | goto out; |
| 152 | } |
| 153 | |
| 154 | cache_fini(XBZRLE.cache); |
| 155 | XBZRLE.cache = new_cache; |
| 156 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 157 | out: |
| 158 | XBZRLE_cache_unlock(); |
| 159 | return ret; |
| 160 | } |
| 161 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 162 | static bool ramblock_is_ignored(RAMBlock *block) |
| 163 | { |
| 164 | return !qemu_ram_is_migratable(block) || |
| 165 | (migrate_ignore_shared() && qemu_ram_is_shared(block)); |
| 166 | } |
| 167 | |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 168 | /* Should be holding either ram_list.mutex, or the RCU lock. */ |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 169 | #define RAMBLOCK_FOREACH_NOT_IGNORED(block) \ |
| 170 | INTERNAL_RAMBLOCK_FOREACH(block) \ |
| 171 | if (ramblock_is_ignored(block)) {} else |
| 172 | |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 173 | #define RAMBLOCK_FOREACH_MIGRATABLE(block) \ |
Dr. David Alan Gilbert | 343f632 | 2018-06-05 17:25:45 +0100 | [diff] [blame] | 174 | INTERNAL_RAMBLOCK_FOREACH(block) \ |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 175 | if (!qemu_ram_is_migratable(block)) {} else |
| 176 | |
Dr. David Alan Gilbert | 343f632 | 2018-06-05 17:25:45 +0100 | [diff] [blame] | 177 | #undef RAMBLOCK_FOREACH |
| 178 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 179 | int foreach_not_ignored_block(RAMBlockIterFunc func, void *opaque) |
| 180 | { |
| 181 | RAMBlock *block; |
| 182 | int ret = 0; |
| 183 | |
| 184 | rcu_read_lock(); |
| 185 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
| 186 | ret = func(block, opaque); |
| 187 | if (ret) { |
| 188 | break; |
| 189 | } |
| 190 | } |
| 191 | rcu_read_unlock(); |
| 192 | return ret; |
| 193 | } |
| 194 | |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 195 | static void ramblock_recv_map_init(void) |
| 196 | { |
| 197 | RAMBlock *rb; |
| 198 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 199 | RAMBLOCK_FOREACH_NOT_IGNORED(rb) { |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 200 | assert(!rb->receivedmap); |
| 201 | rb->receivedmap = bitmap_new(rb->max_length >> qemu_target_page_bits()); |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | int ramblock_recv_bitmap_test(RAMBlock *rb, void *host_addr) |
| 206 | { |
| 207 | return test_bit(ramblock_recv_bitmap_offset(host_addr, rb), |
| 208 | rb->receivedmap); |
| 209 | } |
| 210 | |
Dr. David Alan Gilbert | 1cba9f6 | 2018-03-12 17:21:08 +0000 | [diff] [blame] | 211 | bool ramblock_recv_bitmap_test_byte_offset(RAMBlock *rb, uint64_t byte_offset) |
| 212 | { |
| 213 | return test_bit(byte_offset >> TARGET_PAGE_BITS, rb->receivedmap); |
| 214 | } |
| 215 | |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 216 | void ramblock_recv_bitmap_set(RAMBlock *rb, void *host_addr) |
| 217 | { |
| 218 | set_bit_atomic(ramblock_recv_bitmap_offset(host_addr, rb), rb->receivedmap); |
| 219 | } |
| 220 | |
| 221 | void ramblock_recv_bitmap_set_range(RAMBlock *rb, void *host_addr, |
| 222 | size_t nr) |
| 223 | { |
| 224 | bitmap_set_atomic(rb->receivedmap, |
| 225 | ramblock_recv_bitmap_offset(host_addr, rb), |
| 226 | nr); |
| 227 | } |
| 228 | |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 229 | #define RAMBLOCK_RECV_BITMAP_ENDING (0x0123456789abcdefULL) |
| 230 | |
| 231 | /* |
| 232 | * Format: bitmap_size (8 bytes) + whole_bitmap (N bytes). |
| 233 | * |
| 234 | * Returns >0 if success with sent bytes, or <0 if error. |
| 235 | */ |
| 236 | int64_t ramblock_recv_bitmap_send(QEMUFile *file, |
| 237 | const char *block_name) |
| 238 | { |
| 239 | RAMBlock *block = qemu_ram_block_by_name(block_name); |
| 240 | unsigned long *le_bitmap, nbits; |
| 241 | uint64_t size; |
| 242 | |
| 243 | if (!block) { |
| 244 | error_report("%s: invalid block name: %s", __func__, block_name); |
| 245 | return -1; |
| 246 | } |
| 247 | |
| 248 | nbits = block->used_length >> TARGET_PAGE_BITS; |
| 249 | |
| 250 | /* |
| 251 | * Make sure the tmp bitmap buffer is big enough, e.g., on 32bit |
| 252 | * machines we may need 4 more bytes for padding (see below |
| 253 | * comment). So extend it a bit before hand. |
| 254 | */ |
| 255 | le_bitmap = bitmap_new(nbits + BITS_PER_LONG); |
| 256 | |
| 257 | /* |
| 258 | * Always use little endian when sending the bitmap. This is |
| 259 | * required that when source and destination VMs are not using the |
| 260 | * same endianess. (Note: big endian won't work.) |
| 261 | */ |
| 262 | bitmap_to_le(le_bitmap, block->receivedmap, nbits); |
| 263 | |
| 264 | /* Size of the bitmap, in bytes */ |
Peter Xu | a725ef9 | 2018-07-10 17:18:55 +0800 | [diff] [blame] | 265 | size = DIV_ROUND_UP(nbits, 8); |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 266 | |
| 267 | /* |
| 268 | * size is always aligned to 8 bytes for 64bit machines, but it |
| 269 | * may not be true for 32bit machines. We need this padding to |
| 270 | * make sure the migration can survive even between 32bit and |
| 271 | * 64bit machines. |
| 272 | */ |
| 273 | size = ROUND_UP(size, 8); |
| 274 | |
| 275 | qemu_put_be64(file, size); |
| 276 | qemu_put_buffer(file, (const uint8_t *)le_bitmap, size); |
| 277 | /* |
| 278 | * Mark as an end, in case the middle part is screwed up due to |
| 279 | * some "misterious" reason. |
| 280 | */ |
| 281 | qemu_put_be64(file, RAMBLOCK_RECV_BITMAP_ENDING); |
| 282 | qemu_fflush(file); |
| 283 | |
Peter Xu | bf26990 | 2018-05-25 09:50:42 +0800 | [diff] [blame] | 284 | g_free(le_bitmap); |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 285 | |
| 286 | if (qemu_file_get_error(file)) { |
| 287 | return qemu_file_get_error(file); |
| 288 | } |
| 289 | |
| 290 | return size + sizeof(size); |
| 291 | } |
| 292 | |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 293 | /* |
| 294 | * An outstanding page request, on the source, having been received |
| 295 | * and queued |
| 296 | */ |
| 297 | struct RAMSrcPageRequest { |
| 298 | RAMBlock *rb; |
| 299 | hwaddr offset; |
| 300 | hwaddr len; |
| 301 | |
| 302 | QSIMPLEQ_ENTRY(RAMSrcPageRequest) next_req; |
| 303 | }; |
| 304 | |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 305 | /* State of RAM for migration */ |
| 306 | struct RAMState { |
Juan Quintela | 204b88b | 2017-03-15 09:16:57 +0100 | [diff] [blame] | 307 | /* QEMUFile used for this migration */ |
| 308 | QEMUFile *f; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 309 | /* Last block that we have visited searching for dirty pages */ |
| 310 | RAMBlock *last_seen_block; |
| 311 | /* Last block from where we have sent data */ |
| 312 | RAMBlock *last_sent_block; |
Juan Quintela | 269ace2 | 2017-03-21 15:23:31 +0100 | [diff] [blame] | 313 | /* Last dirty target page we have sent */ |
| 314 | ram_addr_t last_page; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 315 | /* last ram version we have seen */ |
| 316 | uint32_t last_version; |
| 317 | /* We are in the first round */ |
| 318 | bool ram_bulk_stage; |
Wei Wang | 6eeb63f | 2018-12-11 16:24:52 +0800 | [diff] [blame] | 319 | /* The free page optimization is enabled */ |
| 320 | bool fpo_enabled; |
Juan Quintela | 8d820d6 | 2017-03-13 19:35:50 +0100 | [diff] [blame] | 321 | /* How many times we have dirty too many pages */ |
| 322 | int dirty_rate_high_cnt; |
Juan Quintela | f664da8 | 2017-03-13 19:44:57 +0100 | [diff] [blame] | 323 | /* these variables are used for bitmap sync */ |
| 324 | /* last time we did a full bitmap_sync */ |
| 325 | int64_t time_last_bitmap_sync; |
Juan Quintela | eac7415 | 2017-03-28 14:59:01 +0200 | [diff] [blame] | 326 | /* bytes transferred at start_time */ |
Juan Quintela | c4bdf0c | 2017-03-28 14:59:54 +0200 | [diff] [blame] | 327 | uint64_t bytes_xfer_prev; |
Juan Quintela | a66cd90 | 2017-03-28 15:02:43 +0200 | [diff] [blame] | 328 | /* number of dirty pages since start_time */ |
Juan Quintela | 68908ed | 2017-03-28 15:05:53 +0200 | [diff] [blame] | 329 | uint64_t num_dirty_pages_period; |
Juan Quintela | b5833fd | 2017-03-13 19:49:19 +0100 | [diff] [blame] | 330 | /* xbzrle misses since the beginning of the period */ |
| 331 | uint64_t xbzrle_cache_miss_prev; |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 332 | |
| 333 | /* compression statistics since the beginning of the period */ |
| 334 | /* amount of count that no free thread to compress data */ |
| 335 | uint64_t compress_thread_busy_prev; |
| 336 | /* amount bytes after compression */ |
| 337 | uint64_t compressed_size_prev; |
| 338 | /* amount of compressed pages */ |
| 339 | uint64_t compress_pages_prev; |
| 340 | |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 341 | /* total handled target pages at the beginning of period */ |
| 342 | uint64_t target_page_count_prev; |
| 343 | /* total handled target pages since start */ |
| 344 | uint64_t target_page_count; |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 345 | /* number of dirty bits in the bitmap */ |
Peter Xu | 2dfaf12 | 2017-08-02 17:41:19 +0800 | [diff] [blame] | 346 | uint64_t migration_dirty_pages; |
Wei Wang | 386a907 | 2018-12-11 16:24:49 +0800 | [diff] [blame] | 347 | /* Protects modification of the bitmap and migration dirty pages */ |
Juan Quintela | 108cfae | 2017-03-13 21:38:09 +0100 | [diff] [blame] | 348 | QemuMutex bitmap_mutex; |
Juan Quintela | 68a098f | 2017-03-14 13:48:42 +0100 | [diff] [blame] | 349 | /* The RAMBlock used in the last src_page_requests */ |
| 350 | RAMBlock *last_req_rb; |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 351 | /* Queue of outstanding page requests from the destination */ |
| 352 | QemuMutex src_page_req_mutex; |
Paolo Bonzini | b58deb3 | 2018-12-06 11:58:10 +0100 | [diff] [blame] | 353 | QSIMPLEQ_HEAD(, RAMSrcPageRequest) src_page_requests; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 354 | }; |
| 355 | typedef struct RAMState RAMState; |
| 356 | |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 357 | static RAMState *ram_state; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 358 | |
Wei Wang | bd22706 | 2018-12-11 16:24:51 +0800 | [diff] [blame] | 359 | static NotifierWithReturnList precopy_notifier_list; |
| 360 | |
| 361 | void precopy_infrastructure_init(void) |
| 362 | { |
| 363 | notifier_with_return_list_init(&precopy_notifier_list); |
| 364 | } |
| 365 | |
| 366 | void precopy_add_notifier(NotifierWithReturn *n) |
| 367 | { |
| 368 | notifier_with_return_list_add(&precopy_notifier_list, n); |
| 369 | } |
| 370 | |
| 371 | void precopy_remove_notifier(NotifierWithReturn *n) |
| 372 | { |
| 373 | notifier_with_return_remove(n); |
| 374 | } |
| 375 | |
| 376 | int precopy_notify(PrecopyNotifyReason reason, Error **errp) |
| 377 | { |
| 378 | PrecopyNotifyData pnd; |
| 379 | pnd.reason = reason; |
| 380 | pnd.errp = errp; |
| 381 | |
| 382 | return notifier_with_return_list_notify(&precopy_notifier_list, &pnd); |
| 383 | } |
| 384 | |
Wei Wang | 6eeb63f | 2018-12-11 16:24:52 +0800 | [diff] [blame] | 385 | void precopy_enable_free_page_optimization(void) |
| 386 | { |
| 387 | if (!ram_state) { |
| 388 | return; |
| 389 | } |
| 390 | |
| 391 | ram_state->fpo_enabled = true; |
| 392 | } |
| 393 | |
Juan Quintela | 9edabd4 | 2017-03-14 12:02:16 +0100 | [diff] [blame] | 394 | uint64_t ram_bytes_remaining(void) |
| 395 | { |
Dr. David Alan Gilbert | bae416e | 2017-12-15 11:51:23 +0000 | [diff] [blame] | 396 | return ram_state ? (ram_state->migration_dirty_pages * TARGET_PAGE_SIZE) : |
| 397 | 0; |
Juan Quintela | 9edabd4 | 2017-03-14 12:02:16 +0100 | [diff] [blame] | 398 | } |
| 399 | |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 400 | MigrationStats ram_counters; |
Juan Quintela | 9650689 | 2017-03-14 18:41:03 +0100 | [diff] [blame] | 401 | |
Dr. David Alan Gilbert | b8fb8cb | 2015-09-23 15:27:10 +0100 | [diff] [blame] | 402 | /* used by the search for pages to send */ |
| 403 | struct PageSearchStatus { |
| 404 | /* Current block being searched */ |
| 405 | RAMBlock *block; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 406 | /* Current page to search from */ |
| 407 | unsigned long page; |
Dr. David Alan Gilbert | b8fb8cb | 2015-09-23 15:27:10 +0100 | [diff] [blame] | 408 | /* Set once we wrap around */ |
| 409 | bool complete_round; |
| 410 | }; |
| 411 | typedef struct PageSearchStatus PageSearchStatus; |
| 412 | |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 413 | CompressionStats compression_counters; |
| 414 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 415 | struct CompressParam { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 416 | bool done; |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 417 | bool quit; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 418 | bool zero_page; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 419 | QEMUFile *file; |
| 420 | QemuMutex mutex; |
| 421 | QemuCond cond; |
| 422 | RAMBlock *block; |
| 423 | ram_addr_t offset; |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 424 | |
| 425 | /* internally used fields */ |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 426 | z_stream stream; |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 427 | uint8_t *originbuf; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 428 | }; |
| 429 | typedef struct CompressParam CompressParam; |
| 430 | |
| 431 | struct DecompressParam { |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 432 | bool done; |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 433 | bool quit; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 434 | QemuMutex mutex; |
| 435 | QemuCond cond; |
| 436 | void *des; |
Peter Maydell | d341d9f | 2016-01-22 15:09:21 +0000 | [diff] [blame] | 437 | uint8_t *compbuf; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 438 | int len; |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 439 | z_stream stream; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 440 | }; |
| 441 | typedef struct DecompressParam DecompressParam; |
| 442 | |
| 443 | static CompressParam *comp_param; |
| 444 | static QemuThread *compress_threads; |
| 445 | /* comp_done_cond is used to wake up the migration thread when |
| 446 | * one of the compression threads has finished the compression. |
| 447 | * comp_done_lock is used to co-work with comp_done_cond. |
| 448 | */ |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 449 | static QemuMutex comp_done_lock; |
| 450 | static QemuCond comp_done_cond; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 451 | /* The empty QEMUFileOps will be used by file in CompressParam */ |
| 452 | static const QEMUFileOps empty_ops = { }; |
| 453 | |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 454 | static QEMUFile *decomp_file; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 455 | static DecompressParam *decomp_param; |
| 456 | static QemuThread *decompress_threads; |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 457 | static QemuMutex decomp_done_lock; |
| 458 | static QemuCond decomp_done_cond; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 459 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 460 | 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] | 461 | ram_addr_t offset, uint8_t *source_buf); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 462 | |
| 463 | static void *do_data_compress(void *opaque) |
| 464 | { |
| 465 | CompressParam *param = opaque; |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 466 | RAMBlock *block; |
| 467 | ram_addr_t offset; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 468 | bool zero_page; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 469 | |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 470 | qemu_mutex_lock(¶m->mutex); |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 471 | while (!param->quit) { |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 472 | if (param->block) { |
| 473 | block = param->block; |
| 474 | offset = param->offset; |
| 475 | param->block = NULL; |
| 476 | qemu_mutex_unlock(¶m->mutex); |
| 477 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 478 | zero_page = do_compress_ram_page(param->file, ¶m->stream, |
| 479 | block, offset, param->originbuf); |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 480 | |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 481 | qemu_mutex_lock(&comp_done_lock); |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 482 | param->done = true; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 483 | param->zero_page = zero_page; |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 484 | qemu_cond_signal(&comp_done_cond); |
| 485 | qemu_mutex_unlock(&comp_done_lock); |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 486 | |
| 487 | qemu_mutex_lock(¶m->mutex); |
| 488 | } else { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 489 | qemu_cond_wait(¶m->cond, ¶m->mutex); |
| 490 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 491 | } |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 492 | qemu_mutex_unlock(¶m->mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 493 | |
| 494 | return NULL; |
| 495 | } |
| 496 | |
Juan Quintela | f0afa33 | 2017-06-28 11:52:28 +0200 | [diff] [blame] | 497 | static void compress_threads_save_cleanup(void) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 498 | { |
| 499 | int i, thread_count; |
| 500 | |
Fei Li | 0530693 | 2018-09-25 17:14:40 +0800 | [diff] [blame] | 501 | if (!migrate_use_compression() || !comp_param) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 502 | return; |
| 503 | } |
Fei Li | 0530693 | 2018-09-25 17:14:40 +0800 | [diff] [blame] | 504 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 505 | thread_count = migrate_compress_threads(); |
| 506 | for (i = 0; i < thread_count; i++) { |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 507 | /* |
| 508 | * we use it as a indicator which shows if the thread is |
| 509 | * properly init'd or not |
| 510 | */ |
| 511 | if (!comp_param[i].file) { |
| 512 | break; |
| 513 | } |
Fei Li | 0530693 | 2018-09-25 17:14:40 +0800 | [diff] [blame] | 514 | |
| 515 | qemu_mutex_lock(&comp_param[i].mutex); |
| 516 | comp_param[i].quit = true; |
| 517 | qemu_cond_signal(&comp_param[i].cond); |
| 518 | qemu_mutex_unlock(&comp_param[i].mutex); |
| 519 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 520 | qemu_thread_join(compress_threads + i); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 521 | qemu_mutex_destroy(&comp_param[i].mutex); |
| 522 | qemu_cond_destroy(&comp_param[i].cond); |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 523 | deflateEnd(&comp_param[i].stream); |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 524 | g_free(comp_param[i].originbuf); |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 525 | qemu_fclose(comp_param[i].file); |
| 526 | comp_param[i].file = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 527 | } |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 528 | qemu_mutex_destroy(&comp_done_lock); |
| 529 | qemu_cond_destroy(&comp_done_cond); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 530 | g_free(compress_threads); |
| 531 | g_free(comp_param); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 532 | compress_threads = NULL; |
| 533 | comp_param = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 534 | } |
| 535 | |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 536 | static int compress_threads_save_setup(void) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 537 | { |
| 538 | int i, thread_count; |
| 539 | |
| 540 | if (!migrate_use_compression()) { |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 541 | return 0; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 542 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 543 | thread_count = migrate_compress_threads(); |
| 544 | compress_threads = g_new0(QemuThread, thread_count); |
| 545 | comp_param = g_new0(CompressParam, thread_count); |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 546 | qemu_cond_init(&comp_done_cond); |
| 547 | qemu_mutex_init(&comp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 548 | for (i = 0; i < thread_count; i++) { |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 549 | comp_param[i].originbuf = g_try_malloc(TARGET_PAGE_SIZE); |
| 550 | if (!comp_param[i].originbuf) { |
| 551 | goto exit; |
| 552 | } |
| 553 | |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 554 | if (deflateInit(&comp_param[i].stream, |
| 555 | migrate_compress_level()) != Z_OK) { |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 556 | g_free(comp_param[i].originbuf); |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 557 | goto exit; |
| 558 | } |
| 559 | |
Cao jin | e110aa9 | 2016-07-29 15:10:31 +0800 | [diff] [blame] | 560 | /* comp_param[i].file is just used as a dummy buffer to save data, |
| 561 | * set its ops to empty. |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 562 | */ |
| 563 | comp_param[i].file = qemu_fopen_ops(NULL, &empty_ops); |
| 564 | comp_param[i].done = true; |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 565 | comp_param[i].quit = false; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 566 | qemu_mutex_init(&comp_param[i].mutex); |
| 567 | qemu_cond_init(&comp_param[i].cond); |
| 568 | qemu_thread_create(compress_threads + i, "compress", |
| 569 | do_data_compress, comp_param + i, |
| 570 | QEMU_THREAD_JOINABLE); |
| 571 | } |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 572 | return 0; |
| 573 | |
| 574 | exit: |
| 575 | compress_threads_save_cleanup(); |
| 576 | return -1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 577 | } |
| 578 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 579 | /* Multiple fd's */ |
| 580 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 581 | #define MULTIFD_MAGIC 0x11223344U |
| 582 | #define MULTIFD_VERSION 1 |
| 583 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 584 | #define MULTIFD_FLAG_SYNC (1 << 0) |
| 585 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 586 | typedef struct { |
| 587 | uint32_t magic; |
| 588 | uint32_t version; |
| 589 | unsigned char uuid[16]; /* QemuUUID */ |
| 590 | uint8_t id; |
| 591 | } __attribute__((packed)) MultiFDInit_t; |
| 592 | |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 593 | typedef struct { |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 594 | uint32_t magic; |
| 595 | uint32_t version; |
| 596 | uint32_t flags; |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame^] | 597 | /* maximum number of allocated pages */ |
| 598 | uint32_t pages_alloc; |
| 599 | uint32_t pages_used; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 600 | uint64_t packet_num; |
| 601 | char ramblock[256]; |
| 602 | uint64_t offset[]; |
| 603 | } __attribute__((packed)) MultiFDPacket_t; |
| 604 | |
| 605 | typedef struct { |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 606 | /* number of used pages */ |
| 607 | uint32_t used; |
| 608 | /* number of allocated pages */ |
| 609 | uint32_t allocated; |
| 610 | /* global number of generated multifd packets */ |
| 611 | uint64_t packet_num; |
| 612 | /* offset of each page */ |
| 613 | ram_addr_t *offset; |
| 614 | /* pointer to each page */ |
| 615 | struct iovec *iov; |
| 616 | RAMBlock *block; |
| 617 | } MultiFDPages_t; |
| 618 | |
| 619 | typedef struct { |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 620 | /* this fields are not changed once the thread is created */ |
| 621 | /* channel number */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 622 | uint8_t id; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 623 | /* channel thread name */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 624 | char *name; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 625 | /* channel thread id */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 626 | QemuThread thread; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 627 | /* communication channel */ |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 628 | QIOChannel *c; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 629 | /* sem where to wait for more work */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 630 | QemuSemaphore sem; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 631 | /* this mutex protects the following parameters */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 632 | QemuMutex mutex; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 633 | /* is this channel thread running */ |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 634 | bool running; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 635 | /* should this thread finish */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 636 | bool quit; |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 637 | /* thread has work to do */ |
| 638 | int pending_job; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 639 | /* array of pages to sent */ |
| 640 | MultiFDPages_t *pages; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 641 | /* packet allocated len */ |
| 642 | uint32_t packet_len; |
| 643 | /* pointer to the packet */ |
| 644 | MultiFDPacket_t *packet; |
| 645 | /* multifd flags for each packet */ |
| 646 | uint32_t flags; |
| 647 | /* global number of generated multifd packets */ |
| 648 | uint64_t packet_num; |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 649 | /* thread local variables */ |
| 650 | /* packets sent through this channel */ |
| 651 | uint64_t num_packets; |
| 652 | /* pages sent through this channel */ |
| 653 | uint64_t num_pages; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 654 | /* syncs main thread and channels */ |
| 655 | QemuSemaphore sem_sync; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 656 | } MultiFDSendParams; |
| 657 | |
| 658 | typedef struct { |
| 659 | /* this fields are not changed once the thread is created */ |
| 660 | /* channel number */ |
| 661 | uint8_t id; |
| 662 | /* channel thread name */ |
| 663 | char *name; |
| 664 | /* channel thread id */ |
| 665 | QemuThread thread; |
| 666 | /* communication channel */ |
| 667 | QIOChannel *c; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 668 | /* this mutex protects the following parameters */ |
| 669 | QemuMutex mutex; |
| 670 | /* is this channel thread running */ |
| 671 | bool running; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 672 | /* array of pages to receive */ |
| 673 | MultiFDPages_t *pages; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 674 | /* packet allocated len */ |
| 675 | uint32_t packet_len; |
| 676 | /* pointer to the packet */ |
| 677 | MultiFDPacket_t *packet; |
| 678 | /* multifd flags for each packet */ |
| 679 | uint32_t flags; |
| 680 | /* global number of generated multifd packets */ |
| 681 | uint64_t packet_num; |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 682 | /* thread local variables */ |
| 683 | /* packets sent through this channel */ |
| 684 | uint64_t num_packets; |
| 685 | /* pages sent through this channel */ |
| 686 | uint64_t num_pages; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 687 | /* syncs main thread and channels */ |
| 688 | QemuSemaphore sem_sync; |
Juan Quintela | 8c4598f | 2018-04-07 13:59:07 +0200 | [diff] [blame] | 689 | } MultiFDRecvParams; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 690 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 691 | static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp) |
| 692 | { |
| 693 | MultiFDInit_t msg; |
| 694 | int ret; |
| 695 | |
| 696 | msg.magic = cpu_to_be32(MULTIFD_MAGIC); |
| 697 | msg.version = cpu_to_be32(MULTIFD_VERSION); |
| 698 | msg.id = p->id; |
| 699 | memcpy(msg.uuid, &qemu_uuid.data, sizeof(msg.uuid)); |
| 700 | |
| 701 | ret = qio_channel_write_all(p->c, (char *)&msg, sizeof(msg), errp); |
| 702 | if (ret != 0) { |
| 703 | return -1; |
| 704 | } |
| 705 | return 0; |
| 706 | } |
| 707 | |
| 708 | static int multifd_recv_initial_packet(QIOChannel *c, Error **errp) |
| 709 | { |
| 710 | MultiFDInit_t msg; |
| 711 | int ret; |
| 712 | |
| 713 | ret = qio_channel_read_all(c, (char *)&msg, sizeof(msg), errp); |
| 714 | if (ret != 0) { |
| 715 | return -1; |
| 716 | } |
| 717 | |
Peter Maydell | 341ba0d | 2018-09-25 17:19:24 +0100 | [diff] [blame] | 718 | msg.magic = be32_to_cpu(msg.magic); |
| 719 | msg.version = be32_to_cpu(msg.version); |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 720 | |
| 721 | if (msg.magic != MULTIFD_MAGIC) { |
| 722 | error_setg(errp, "multifd: received packet magic %x " |
| 723 | "expected %x", msg.magic, MULTIFD_MAGIC); |
| 724 | return -1; |
| 725 | } |
| 726 | |
| 727 | if (msg.version != MULTIFD_VERSION) { |
| 728 | error_setg(errp, "multifd: received packet version %d " |
| 729 | "expected %d", msg.version, MULTIFD_VERSION); |
| 730 | return -1; |
| 731 | } |
| 732 | |
| 733 | if (memcmp(msg.uuid, &qemu_uuid, sizeof(qemu_uuid))) { |
| 734 | char *uuid = qemu_uuid_unparse_strdup(&qemu_uuid); |
| 735 | char *msg_uuid = qemu_uuid_unparse_strdup((const QemuUUID *)msg.uuid); |
| 736 | |
| 737 | error_setg(errp, "multifd: received uuid '%s' and expected " |
| 738 | "uuid '%s' for channel %hhd", msg_uuid, uuid, msg.id); |
| 739 | g_free(uuid); |
| 740 | g_free(msg_uuid); |
| 741 | return -1; |
| 742 | } |
| 743 | |
| 744 | if (msg.id > migrate_multifd_channels()) { |
| 745 | error_setg(errp, "multifd: received channel version %d " |
| 746 | "expected %d", msg.version, MULTIFD_VERSION); |
| 747 | return -1; |
| 748 | } |
| 749 | |
| 750 | return msg.id; |
| 751 | } |
| 752 | |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 753 | static MultiFDPages_t *multifd_pages_init(size_t size) |
| 754 | { |
| 755 | MultiFDPages_t *pages = g_new0(MultiFDPages_t, 1); |
| 756 | |
| 757 | pages->allocated = size; |
| 758 | pages->iov = g_new0(struct iovec, size); |
| 759 | pages->offset = g_new0(ram_addr_t, size); |
| 760 | |
| 761 | return pages; |
| 762 | } |
| 763 | |
| 764 | static void multifd_pages_clear(MultiFDPages_t *pages) |
| 765 | { |
| 766 | pages->used = 0; |
| 767 | pages->allocated = 0; |
| 768 | pages->packet_num = 0; |
| 769 | pages->block = NULL; |
| 770 | g_free(pages->iov); |
| 771 | pages->iov = NULL; |
| 772 | g_free(pages->offset); |
| 773 | pages->offset = NULL; |
| 774 | g_free(pages); |
| 775 | } |
| 776 | |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 777 | static void multifd_send_fill_packet(MultiFDSendParams *p) |
| 778 | { |
| 779 | MultiFDPacket_t *packet = p->packet; |
| 780 | int i; |
| 781 | |
| 782 | packet->magic = cpu_to_be32(MULTIFD_MAGIC); |
| 783 | packet->version = cpu_to_be32(MULTIFD_VERSION); |
| 784 | packet->flags = cpu_to_be32(p->flags); |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame^] | 785 | packet->pages_alloc = cpu_to_be32(migrate_multifd_page_count()); |
| 786 | packet->pages_used = cpu_to_be32(p->pages->used); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 787 | packet->packet_num = cpu_to_be64(p->packet_num); |
| 788 | |
| 789 | if (p->pages->block) { |
| 790 | strncpy(packet->ramblock, p->pages->block->idstr, 256); |
| 791 | } |
| 792 | |
| 793 | for (i = 0; i < p->pages->used; i++) { |
| 794 | packet->offset[i] = cpu_to_be64(p->pages->offset[i]); |
| 795 | } |
| 796 | } |
| 797 | |
| 798 | static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) |
| 799 | { |
| 800 | MultiFDPacket_t *packet = p->packet; |
| 801 | RAMBlock *block; |
| 802 | int i; |
| 803 | |
Peter Maydell | 341ba0d | 2018-09-25 17:19:24 +0100 | [diff] [blame] | 804 | packet->magic = be32_to_cpu(packet->magic); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 805 | if (packet->magic != MULTIFD_MAGIC) { |
| 806 | error_setg(errp, "multifd: received packet " |
| 807 | "magic %x and expected magic %x", |
| 808 | packet->magic, MULTIFD_MAGIC); |
| 809 | return -1; |
| 810 | } |
| 811 | |
Peter Maydell | 341ba0d | 2018-09-25 17:19:24 +0100 | [diff] [blame] | 812 | packet->version = be32_to_cpu(packet->version); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 813 | if (packet->version != MULTIFD_VERSION) { |
| 814 | error_setg(errp, "multifd: received packet " |
| 815 | "version %d and expected version %d", |
| 816 | packet->version, MULTIFD_VERSION); |
| 817 | return -1; |
| 818 | } |
| 819 | |
| 820 | p->flags = be32_to_cpu(packet->flags); |
| 821 | |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame^] | 822 | packet->pages_alloc = be32_to_cpu(packet->pages_alloc); |
| 823 | if (packet->pages_alloc > migrate_multifd_page_count()) { |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 824 | error_setg(errp, "multifd: received packet " |
| 825 | "with size %d and expected maximum size %d", |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame^] | 826 | packet->pages_alloc, migrate_multifd_page_count()) ; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 827 | return -1; |
| 828 | } |
| 829 | |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame^] | 830 | p->pages->used = be32_to_cpu(packet->pages_used); |
| 831 | if (p->pages->used > packet->pages_alloc) { |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 832 | error_setg(errp, "multifd: received packet " |
Juan Quintela | 6f86269 | 2019-02-20 12:04:04 +0100 | [diff] [blame^] | 833 | "with %d pages and expected maximum pages are %d", |
| 834 | p->pages->used, packet->pages_alloc) ; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 835 | return -1; |
| 836 | } |
| 837 | |
| 838 | p->packet_num = be64_to_cpu(packet->packet_num); |
| 839 | |
| 840 | if (p->pages->used) { |
| 841 | /* make sure that ramblock is 0 terminated */ |
| 842 | packet->ramblock[255] = 0; |
| 843 | block = qemu_ram_block_by_name(packet->ramblock); |
| 844 | if (!block) { |
| 845 | error_setg(errp, "multifd: unknown ram block %s", |
| 846 | packet->ramblock); |
| 847 | return -1; |
| 848 | } |
| 849 | } |
| 850 | |
| 851 | for (i = 0; i < p->pages->used; i++) { |
| 852 | ram_addr_t offset = be64_to_cpu(packet->offset[i]); |
| 853 | |
| 854 | if (offset > (block->used_length - TARGET_PAGE_SIZE)) { |
| 855 | error_setg(errp, "multifd: offset too long " RAM_ADDR_FMT |
| 856 | " (max " RAM_ADDR_FMT ")", |
| 857 | offset, block->max_length); |
| 858 | return -1; |
| 859 | } |
| 860 | p->pages->iov[i].iov_base = block->host + offset; |
| 861 | p->pages->iov[i].iov_len = TARGET_PAGE_SIZE; |
| 862 | } |
| 863 | |
| 864 | return 0; |
| 865 | } |
| 866 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 867 | struct { |
| 868 | MultiFDSendParams *params; |
| 869 | /* number of created threads */ |
| 870 | int count; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 871 | /* array of pages to sent */ |
| 872 | MultiFDPages_t *pages; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 873 | /* syncs main thread and channels */ |
| 874 | QemuSemaphore sem_sync; |
| 875 | /* global number of generated multifd packets */ |
| 876 | uint64_t packet_num; |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 877 | /* send channels ready */ |
| 878 | QemuSemaphore channels_ready; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 879 | } *multifd_send_state; |
| 880 | |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 881 | /* |
| 882 | * How we use multifd_send_state->pages and channel->pages? |
| 883 | * |
| 884 | * We create a pages for each channel, and a main one. Each time that |
| 885 | * we need to send a batch of pages we interchange the ones between |
| 886 | * multifd_send_state and the channel that is sending it. There are |
| 887 | * two reasons for that: |
| 888 | * - to not have to do so many mallocs during migration |
| 889 | * - to make easier to know what to free at the end of migration |
| 890 | * |
| 891 | * This way we always know who is the owner of each "pages" struct, |
| 892 | * and we don't need any loocking. It belongs to the migration thread |
| 893 | * or to the channel thread. Switching is safe because the migration |
| 894 | * thread is using the channel mutex when changing it, and the channel |
| 895 | * have to had finish with its own, otherwise pending_job can't be |
| 896 | * false. |
| 897 | */ |
| 898 | |
| 899 | static void multifd_send_pages(void) |
| 900 | { |
| 901 | int i; |
| 902 | static int next_channel; |
| 903 | MultiFDSendParams *p = NULL; /* make happy gcc */ |
| 904 | MultiFDPages_t *pages = multifd_send_state->pages; |
| 905 | uint64_t transferred; |
| 906 | |
| 907 | qemu_sem_wait(&multifd_send_state->channels_ready); |
| 908 | for (i = next_channel;; i = (i + 1) % migrate_multifd_channels()) { |
| 909 | p = &multifd_send_state->params[i]; |
| 910 | |
| 911 | qemu_mutex_lock(&p->mutex); |
| 912 | if (!p->pending_job) { |
| 913 | p->pending_job++; |
| 914 | next_channel = (i + 1) % migrate_multifd_channels(); |
| 915 | break; |
| 916 | } |
| 917 | qemu_mutex_unlock(&p->mutex); |
| 918 | } |
| 919 | p->pages->used = 0; |
| 920 | |
| 921 | p->packet_num = multifd_send_state->packet_num++; |
| 922 | p->pages->block = NULL; |
| 923 | multifd_send_state->pages = p->pages; |
| 924 | p->pages = pages; |
Peter Xu | 4fcefd4 | 2018-07-20 11:47:13 +0800 | [diff] [blame] | 925 | transferred = ((uint64_t) pages->used) * TARGET_PAGE_SIZE + p->packet_len; |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 926 | ram_counters.multifd_bytes += transferred; |
| 927 | ram_counters.transferred += transferred;; |
| 928 | qemu_mutex_unlock(&p->mutex); |
| 929 | qemu_sem_post(&p->sem); |
| 930 | } |
| 931 | |
| 932 | static void multifd_queue_page(RAMBlock *block, ram_addr_t offset) |
| 933 | { |
| 934 | MultiFDPages_t *pages = multifd_send_state->pages; |
| 935 | |
| 936 | if (!pages->block) { |
| 937 | pages->block = block; |
| 938 | } |
| 939 | |
| 940 | if (pages->block == block) { |
| 941 | pages->offset[pages->used] = offset; |
| 942 | pages->iov[pages->used].iov_base = block->host + offset; |
| 943 | pages->iov[pages->used].iov_len = TARGET_PAGE_SIZE; |
| 944 | pages->used++; |
| 945 | |
| 946 | if (pages->used < pages->allocated) { |
| 947 | return; |
| 948 | } |
| 949 | } |
| 950 | |
| 951 | multifd_send_pages(); |
| 952 | |
| 953 | if (pages->block != block) { |
| 954 | multifd_queue_page(block, offset); |
| 955 | } |
| 956 | } |
| 957 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 958 | static void multifd_send_terminate_threads(Error *err) |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 959 | { |
| 960 | int i; |
| 961 | |
Juan Quintela | 7a169d7 | 2018-02-19 19:01:15 +0100 | [diff] [blame] | 962 | if (err) { |
| 963 | MigrationState *s = migrate_get_current(); |
| 964 | migrate_set_error(s, err); |
| 965 | if (s->state == MIGRATION_STATUS_SETUP || |
| 966 | s->state == MIGRATION_STATUS_PRE_SWITCHOVER || |
| 967 | s->state == MIGRATION_STATUS_DEVICE || |
| 968 | s->state == MIGRATION_STATUS_ACTIVE) { |
| 969 | migrate_set_state(&s->state, s->state, |
| 970 | MIGRATION_STATUS_FAILED); |
| 971 | } |
| 972 | } |
| 973 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 974 | for (i = 0; i < migrate_multifd_channels(); i++) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 975 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 976 | |
| 977 | qemu_mutex_lock(&p->mutex); |
| 978 | p->quit = true; |
| 979 | qemu_sem_post(&p->sem); |
| 980 | qemu_mutex_unlock(&p->mutex); |
| 981 | } |
| 982 | } |
| 983 | |
Fei Li | 1398b2e | 2019-01-13 22:08:47 +0800 | [diff] [blame] | 984 | void multifd_save_cleanup(void) |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 985 | { |
| 986 | int i; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 987 | |
| 988 | if (!migrate_use_multifd()) { |
Fei Li | 1398b2e | 2019-01-13 22:08:47 +0800 | [diff] [blame] | 989 | return; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 990 | } |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 991 | multifd_send_terminate_threads(NULL); |
| 992 | for (i = 0; i < migrate_multifd_channels(); i++) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 993 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 994 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 995 | if (p->running) { |
| 996 | qemu_thread_join(&p->thread); |
| 997 | } |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 998 | socket_send_channel_destroy(p->c); |
| 999 | p->c = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1000 | qemu_mutex_destroy(&p->mutex); |
| 1001 | qemu_sem_destroy(&p->sem); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1002 | qemu_sem_destroy(&p->sem_sync); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1003 | g_free(p->name); |
| 1004 | p->name = NULL; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1005 | multifd_pages_clear(p->pages); |
| 1006 | p->pages = NULL; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 1007 | p->packet_len = 0; |
| 1008 | g_free(p->packet); |
| 1009 | p->packet = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1010 | } |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1011 | qemu_sem_destroy(&multifd_send_state->channels_ready); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1012 | qemu_sem_destroy(&multifd_send_state->sem_sync); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1013 | g_free(multifd_send_state->params); |
| 1014 | multifd_send_state->params = NULL; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1015 | multifd_pages_clear(multifd_send_state->pages); |
| 1016 | multifd_send_state->pages = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1017 | g_free(multifd_send_state); |
| 1018 | multifd_send_state = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1019 | } |
| 1020 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1021 | static void multifd_send_sync_main(void) |
| 1022 | { |
| 1023 | int i; |
| 1024 | |
| 1025 | if (!migrate_use_multifd()) { |
| 1026 | return; |
| 1027 | } |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1028 | if (multifd_send_state->pages->used) { |
| 1029 | multifd_send_pages(); |
| 1030 | } |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1031 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 1032 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 1033 | |
| 1034 | trace_multifd_send_sync_main_signal(p->id); |
| 1035 | |
| 1036 | qemu_mutex_lock(&p->mutex); |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1037 | |
| 1038 | p->packet_num = multifd_send_state->packet_num++; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1039 | p->flags |= MULTIFD_FLAG_SYNC; |
| 1040 | p->pending_job++; |
| 1041 | qemu_mutex_unlock(&p->mutex); |
| 1042 | qemu_sem_post(&p->sem); |
| 1043 | } |
| 1044 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 1045 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 1046 | |
| 1047 | trace_multifd_send_sync_main_wait(p->id); |
| 1048 | qemu_sem_wait(&multifd_send_state->sem_sync); |
| 1049 | } |
| 1050 | trace_multifd_send_sync_main(multifd_send_state->packet_num); |
| 1051 | } |
| 1052 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1053 | static void *multifd_send_thread(void *opaque) |
| 1054 | { |
| 1055 | MultiFDSendParams *p = opaque; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1056 | Error *local_err = NULL; |
Juan Quintela | 8b2db7f | 2018-04-11 12:36:13 +0200 | [diff] [blame] | 1057 | int ret; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1058 | |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1059 | trace_multifd_send_thread_start(p->id); |
Lidong Chen | 74637e6 | 2018-08-06 21:29:29 +0800 | [diff] [blame] | 1060 | rcu_register_thread(); |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1061 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1062 | if (multifd_send_initial_packet(p, &local_err) < 0) { |
| 1063 | goto out; |
| 1064 | } |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1065 | /* initial packet */ |
| 1066 | p->num_packets = 1; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1067 | |
| 1068 | while (true) { |
Juan Quintela | d82628e | 2018-04-11 02:44:24 +0200 | [diff] [blame] | 1069 | qemu_sem_wait(&p->sem); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1070 | qemu_mutex_lock(&p->mutex); |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1071 | |
| 1072 | if (p->pending_job) { |
| 1073 | uint32_t used = p->pages->used; |
| 1074 | uint64_t packet_num = p->packet_num; |
| 1075 | uint32_t flags = p->flags; |
| 1076 | |
| 1077 | multifd_send_fill_packet(p); |
| 1078 | p->flags = 0; |
| 1079 | p->num_packets++; |
| 1080 | p->num_pages += used; |
| 1081 | p->pages->used = 0; |
| 1082 | qemu_mutex_unlock(&p->mutex); |
| 1083 | |
| 1084 | trace_multifd_send(p->id, packet_num, used, flags); |
| 1085 | |
Juan Quintela | 8b2db7f | 2018-04-11 12:36:13 +0200 | [diff] [blame] | 1086 | ret = qio_channel_write_all(p->c, (void *)p->packet, |
| 1087 | p->packet_len, &local_err); |
| 1088 | if (ret != 0) { |
| 1089 | break; |
| 1090 | } |
| 1091 | |
Juan Quintela | ad24c7c | 2019-01-04 19:12:35 +0100 | [diff] [blame] | 1092 | if (used) { |
| 1093 | ret = qio_channel_writev_all(p->c, p->pages->iov, |
| 1094 | used, &local_err); |
| 1095 | if (ret != 0) { |
| 1096 | break; |
| 1097 | } |
Juan Quintela | 8b2db7f | 2018-04-11 12:36:13 +0200 | [diff] [blame] | 1098 | } |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1099 | |
| 1100 | qemu_mutex_lock(&p->mutex); |
| 1101 | p->pending_job--; |
| 1102 | qemu_mutex_unlock(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1103 | |
| 1104 | if (flags & MULTIFD_FLAG_SYNC) { |
| 1105 | qemu_sem_post(&multifd_send_state->sem_sync); |
| 1106 | } |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1107 | qemu_sem_post(&multifd_send_state->channels_ready); |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1108 | } else if (p->quit) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1109 | qemu_mutex_unlock(&p->mutex); |
| 1110 | break; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1111 | } else { |
| 1112 | qemu_mutex_unlock(&p->mutex); |
| 1113 | /* sometimes there are spurious wakeups */ |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1114 | } |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1115 | } |
| 1116 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1117 | out: |
| 1118 | if (local_err) { |
| 1119 | multifd_send_terminate_threads(local_err); |
| 1120 | } |
| 1121 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1122 | qemu_mutex_lock(&p->mutex); |
| 1123 | p->running = false; |
| 1124 | qemu_mutex_unlock(&p->mutex); |
| 1125 | |
Lidong Chen | 74637e6 | 2018-08-06 21:29:29 +0800 | [diff] [blame] | 1126 | rcu_unregister_thread(); |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1127 | trace_multifd_send_thread_end(p->id, p->num_packets, p->num_pages); |
| 1128 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1129 | return NULL; |
| 1130 | } |
| 1131 | |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1132 | static void multifd_new_send_channel_async(QIOTask *task, gpointer opaque) |
| 1133 | { |
| 1134 | MultiFDSendParams *p = opaque; |
| 1135 | QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task)); |
| 1136 | Error *local_err = NULL; |
| 1137 | |
| 1138 | if (qio_task_propagate_error(task, &local_err)) { |
Fei Li | 1398b2e | 2019-01-13 22:08:47 +0800 | [diff] [blame] | 1139 | migrate_set_error(migrate_get_current(), local_err); |
| 1140 | multifd_save_cleanup(); |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1141 | } else { |
| 1142 | p->c = QIO_CHANNEL(sioc); |
| 1143 | qio_channel_set_delay(p->c, false); |
| 1144 | p->running = true; |
| 1145 | qemu_thread_create(&p->thread, p->name, multifd_send_thread, p, |
| 1146 | QEMU_THREAD_JOINABLE); |
| 1147 | |
| 1148 | atomic_inc(&multifd_send_state->count); |
| 1149 | } |
| 1150 | } |
| 1151 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1152 | int multifd_save_setup(void) |
| 1153 | { |
| 1154 | int thread_count; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1155 | uint32_t page_count = migrate_multifd_page_count(); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1156 | uint8_t i; |
| 1157 | |
| 1158 | if (!migrate_use_multifd()) { |
| 1159 | return 0; |
| 1160 | } |
| 1161 | thread_count = migrate_multifd_channels(); |
| 1162 | multifd_send_state = g_malloc0(sizeof(*multifd_send_state)); |
| 1163 | multifd_send_state->params = g_new0(MultiFDSendParams, thread_count); |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1164 | atomic_set(&multifd_send_state->count, 0); |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1165 | multifd_send_state->pages = multifd_pages_init(page_count); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1166 | qemu_sem_init(&multifd_send_state->sem_sync, 0); |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1167 | qemu_sem_init(&multifd_send_state->channels_ready, 0); |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1168 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1169 | for (i = 0; i < thread_count; i++) { |
| 1170 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 1171 | |
| 1172 | qemu_mutex_init(&p->mutex); |
| 1173 | qemu_sem_init(&p->sem, 0); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1174 | qemu_sem_init(&p->sem_sync, 0); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1175 | p->quit = false; |
Juan Quintela | 0beb5ed | 2018-04-11 03:02:10 +0200 | [diff] [blame] | 1176 | p->pending_job = 0; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1177 | p->id = i; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1178 | p->pages = multifd_pages_init(page_count); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 1179 | p->packet_len = sizeof(MultiFDPacket_t) |
| 1180 | + sizeof(ram_addr_t) * page_count; |
| 1181 | p->packet = g_malloc0(p->packet_len); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1182 | p->name = g_strdup_printf("multifdsend_%d", i); |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1183 | socket_send_channel_create(multifd_new_send_channel_async, p); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1184 | } |
| 1185 | return 0; |
| 1186 | } |
| 1187 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1188 | struct { |
| 1189 | MultiFDRecvParams *params; |
| 1190 | /* number of created threads */ |
| 1191 | int count; |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1192 | /* syncs main thread and channels */ |
| 1193 | QemuSemaphore sem_sync; |
| 1194 | /* global number of generated multifd packets */ |
| 1195 | uint64_t packet_num; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1196 | } *multifd_recv_state; |
| 1197 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1198 | static void multifd_recv_terminate_threads(Error *err) |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1199 | { |
| 1200 | int i; |
| 1201 | |
Juan Quintela | 7a169d7 | 2018-02-19 19:01:15 +0100 | [diff] [blame] | 1202 | if (err) { |
| 1203 | MigrationState *s = migrate_get_current(); |
| 1204 | migrate_set_error(s, err); |
| 1205 | if (s->state == MIGRATION_STATUS_SETUP || |
| 1206 | s->state == MIGRATION_STATUS_ACTIVE) { |
| 1207 | migrate_set_state(&s->state, s->state, |
| 1208 | MIGRATION_STATUS_FAILED); |
| 1209 | } |
| 1210 | } |
| 1211 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1212 | for (i = 0; i < migrate_multifd_channels(); i++) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1213 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1214 | |
| 1215 | qemu_mutex_lock(&p->mutex); |
Juan Quintela | 7a5cc33 | 2018-04-18 00:49:19 +0200 | [diff] [blame] | 1216 | /* We could arrive here for two reasons: |
| 1217 | - normal quit, i.e. everything went fine, just finished |
| 1218 | - error quit: We close the channels so the channel threads |
| 1219 | finish the qio_channel_read_all_eof() */ |
| 1220 | qio_channel_shutdown(p->c, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1221 | qemu_mutex_unlock(&p->mutex); |
| 1222 | } |
| 1223 | } |
| 1224 | |
| 1225 | int multifd_load_cleanup(Error **errp) |
| 1226 | { |
| 1227 | int i; |
| 1228 | int ret = 0; |
| 1229 | |
| 1230 | if (!migrate_use_multifd()) { |
| 1231 | return 0; |
| 1232 | } |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1233 | multifd_recv_terminate_threads(NULL); |
| 1234 | for (i = 0; i < migrate_multifd_channels(); i++) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1235 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1236 | |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1237 | if (p->running) { |
| 1238 | qemu_thread_join(&p->thread); |
| 1239 | } |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1240 | object_unref(OBJECT(p->c)); |
| 1241 | p->c = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1242 | qemu_mutex_destroy(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1243 | qemu_sem_destroy(&p->sem_sync); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1244 | g_free(p->name); |
| 1245 | p->name = NULL; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1246 | multifd_pages_clear(p->pages); |
| 1247 | p->pages = NULL; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 1248 | p->packet_len = 0; |
| 1249 | g_free(p->packet); |
| 1250 | p->packet = NULL; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1251 | } |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1252 | qemu_sem_destroy(&multifd_recv_state->sem_sync); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1253 | g_free(multifd_recv_state->params); |
| 1254 | multifd_recv_state->params = NULL; |
| 1255 | g_free(multifd_recv_state); |
| 1256 | multifd_recv_state = NULL; |
| 1257 | |
| 1258 | return ret; |
| 1259 | } |
| 1260 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1261 | static void multifd_recv_sync_main(void) |
| 1262 | { |
| 1263 | int i; |
| 1264 | |
| 1265 | if (!migrate_use_multifd()) { |
| 1266 | return; |
| 1267 | } |
| 1268 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 1269 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1270 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1271 | trace_multifd_recv_sync_main_wait(p->id); |
| 1272 | qemu_sem_wait(&multifd_recv_state->sem_sync); |
| 1273 | qemu_mutex_lock(&p->mutex); |
| 1274 | if (multifd_recv_state->packet_num < p->packet_num) { |
| 1275 | multifd_recv_state->packet_num = p->packet_num; |
| 1276 | } |
| 1277 | qemu_mutex_unlock(&p->mutex); |
| 1278 | } |
| 1279 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 1280 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1281 | |
| 1282 | trace_multifd_recv_sync_main_signal(p->id); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1283 | qemu_sem_post(&p->sem_sync); |
| 1284 | } |
| 1285 | trace_multifd_recv_sync_main(multifd_recv_state->packet_num); |
| 1286 | } |
| 1287 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1288 | static void *multifd_recv_thread(void *opaque) |
| 1289 | { |
| 1290 | MultiFDRecvParams *p = opaque; |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 1291 | Error *local_err = NULL; |
| 1292 | int ret; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1293 | |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1294 | trace_multifd_recv_thread_start(p->id); |
Lidong Chen | 74637e6 | 2018-08-06 21:29:29 +0800 | [diff] [blame] | 1295 | rcu_register_thread(); |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1296 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1297 | while (true) { |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1298 | uint32_t used; |
| 1299 | uint32_t flags; |
| 1300 | |
Juan Quintela | 8b2db7f | 2018-04-11 12:36:13 +0200 | [diff] [blame] | 1301 | ret = qio_channel_read_all_eof(p->c, (void *)p->packet, |
| 1302 | p->packet_len, &local_err); |
| 1303 | if (ret == 0) { /* EOF */ |
| 1304 | break; |
| 1305 | } |
| 1306 | if (ret == -1) { /* Error */ |
| 1307 | break; |
| 1308 | } |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1309 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1310 | qemu_mutex_lock(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1311 | ret = multifd_recv_unfill_packet(p, &local_err); |
| 1312 | if (ret) { |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1313 | qemu_mutex_unlock(&p->mutex); |
| 1314 | break; |
| 1315 | } |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1316 | |
| 1317 | used = p->pages->used; |
| 1318 | flags = p->flags; |
| 1319 | trace_multifd_recv(p->id, p->packet_num, used, flags); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1320 | p->num_packets++; |
| 1321 | p->num_pages += used; |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1322 | qemu_mutex_unlock(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1323 | |
Juan Quintela | ad24c7c | 2019-01-04 19:12:35 +0100 | [diff] [blame] | 1324 | if (used) { |
| 1325 | ret = qio_channel_readv_all(p->c, p->pages->iov, |
| 1326 | used, &local_err); |
| 1327 | if (ret != 0) { |
| 1328 | break; |
| 1329 | } |
Juan Quintela | 8b2db7f | 2018-04-11 12:36:13 +0200 | [diff] [blame] | 1330 | } |
| 1331 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1332 | if (flags & MULTIFD_FLAG_SYNC) { |
| 1333 | qemu_sem_post(&multifd_recv_state->sem_sync); |
| 1334 | qemu_sem_wait(&p->sem_sync); |
| 1335 | } |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1336 | } |
| 1337 | |
Juan Quintela | d82628e | 2018-04-11 02:44:24 +0200 | [diff] [blame] | 1338 | if (local_err) { |
| 1339 | multifd_recv_terminate_threads(local_err); |
| 1340 | } |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1341 | qemu_mutex_lock(&p->mutex); |
| 1342 | p->running = false; |
| 1343 | qemu_mutex_unlock(&p->mutex); |
| 1344 | |
Lidong Chen | 74637e6 | 2018-08-06 21:29:29 +0800 | [diff] [blame] | 1345 | rcu_unregister_thread(); |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1346 | trace_multifd_recv_thread_end(p->id, p->num_packets, p->num_pages); |
| 1347 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1348 | return NULL; |
| 1349 | } |
| 1350 | |
| 1351 | int multifd_load_setup(void) |
| 1352 | { |
| 1353 | int thread_count; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1354 | uint32_t page_count = migrate_multifd_page_count(); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1355 | uint8_t i; |
| 1356 | |
| 1357 | if (!migrate_use_multifd()) { |
| 1358 | return 0; |
| 1359 | } |
| 1360 | thread_count = migrate_multifd_channels(); |
| 1361 | multifd_recv_state = g_malloc0(sizeof(*multifd_recv_state)); |
| 1362 | multifd_recv_state->params = g_new0(MultiFDRecvParams, thread_count); |
Juan Quintela | 6677070 | 2018-02-19 19:01:45 +0100 | [diff] [blame] | 1363 | atomic_set(&multifd_recv_state->count, 0); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1364 | qemu_sem_init(&multifd_recv_state->sem_sync, 0); |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1365 | |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1366 | for (i = 0; i < thread_count; i++) { |
| 1367 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1368 | |
| 1369 | qemu_mutex_init(&p->mutex); |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 1370 | qemu_sem_init(&p->sem_sync, 0); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1371 | p->id = i; |
Juan Quintela | 34c55a9 | 2018-04-10 23:35:15 +0200 | [diff] [blame] | 1372 | p->pages = multifd_pages_init(page_count); |
Juan Quintela | 2a26c97 | 2018-04-04 11:26:58 +0200 | [diff] [blame] | 1373 | p->packet_len = sizeof(MultiFDPacket_t) |
| 1374 | + sizeof(ram_addr_t) * page_count; |
| 1375 | p->packet = g_malloc0(p->packet_len); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1376 | p->name = g_strdup_printf("multifdrecv_%d", i); |
Juan Quintela | f986c3d | 2016-01-14 16:52:55 +0100 | [diff] [blame] | 1377 | } |
| 1378 | return 0; |
| 1379 | } |
| 1380 | |
Juan Quintela | 62c1e0c | 2018-02-19 18:59:02 +0100 | [diff] [blame] | 1381 | bool multifd_recv_all_channels_created(void) |
| 1382 | { |
| 1383 | int thread_count = migrate_multifd_channels(); |
| 1384 | |
| 1385 | if (!migrate_use_multifd()) { |
| 1386 | return true; |
| 1387 | } |
| 1388 | |
| 1389 | return thread_count == atomic_read(&multifd_recv_state->count); |
| 1390 | } |
| 1391 | |
Fei Li | 49ed0d2 | 2019-01-13 22:08:46 +0800 | [diff] [blame] | 1392 | /* |
| 1393 | * Try to receive all multifd channels to get ready for the migration. |
| 1394 | * - Return true and do not set @errp when correctly receving all channels; |
| 1395 | * - Return false and do not set @errp when correctly receiving the current one; |
| 1396 | * - Return false and set @errp when failing to receive the current channel. |
| 1397 | */ |
| 1398 | bool multifd_recv_new_channel(QIOChannel *ioc, Error **errp) |
Juan Quintela | 71bb07d | 2018-02-19 19:01:03 +0100 | [diff] [blame] | 1399 | { |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1400 | MultiFDRecvParams *p; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1401 | Error *local_err = NULL; |
| 1402 | int id; |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1403 | |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1404 | id = multifd_recv_initial_packet(ioc, &local_err); |
| 1405 | if (id < 0) { |
| 1406 | multifd_recv_terminate_threads(local_err); |
Fei Li | 49ed0d2 | 2019-01-13 22:08:46 +0800 | [diff] [blame] | 1407 | error_propagate_prepend(errp, local_err, |
| 1408 | "failed to receive packet" |
| 1409 | " via multifd channel %d: ", |
| 1410 | atomic_read(&multifd_recv_state->count)); |
Peter Xu | 81e6205 | 2018-06-27 21:22:44 +0800 | [diff] [blame] | 1411 | return false; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1412 | } |
| 1413 | |
| 1414 | p = &multifd_recv_state->params[id]; |
| 1415 | if (p->c != NULL) { |
| 1416 | error_setg(&local_err, "multifd: received id '%d' already setup'", |
| 1417 | id); |
| 1418 | multifd_recv_terminate_threads(local_err); |
Fei Li | 49ed0d2 | 2019-01-13 22:08:46 +0800 | [diff] [blame] | 1419 | error_propagate(errp, local_err); |
Peter Xu | 81e6205 | 2018-06-27 21:22:44 +0800 | [diff] [blame] | 1420 | return false; |
Juan Quintela | af8b7d2 | 2018-04-06 19:32:12 +0200 | [diff] [blame] | 1421 | } |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1422 | p->c = ioc; |
| 1423 | object_ref(OBJECT(ioc)); |
Juan Quintela | 408ea6a | 2018-04-06 18:28:59 +0200 | [diff] [blame] | 1424 | /* initial packet */ |
| 1425 | p->num_packets = 1; |
Juan Quintela | 60df2d4 | 2018-03-07 07:56:15 +0100 | [diff] [blame] | 1426 | |
| 1427 | p->running = true; |
| 1428 | qemu_thread_create(&p->thread, p->name, multifd_recv_thread, p, |
| 1429 | QEMU_THREAD_JOINABLE); |
| 1430 | atomic_inc(&multifd_recv_state->count); |
Fei Li | 49ed0d2 | 2019-01-13 22:08:46 +0800 | [diff] [blame] | 1431 | return atomic_read(&multifd_recv_state->count) == |
| 1432 | migrate_multifd_channels(); |
Juan Quintela | 71bb07d | 2018-02-19 19:01:03 +0100 | [diff] [blame] | 1433 | } |
| 1434 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1435 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1436 | * save_page_header: write page header to wire |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1437 | * |
| 1438 | * If this is the 1st block, it also writes the block identification |
| 1439 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1440 | * Returns the number of bytes written |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1441 | * |
| 1442 | * @f: QEMUFile where to send the data |
| 1443 | * @block: block that contains the page we want to send |
| 1444 | * @offset: offset inside the block for the page |
| 1445 | * in the lower bits, it contains flags |
| 1446 | */ |
Juan Quintela | 2bf3aa8 | 2017-05-10 13:28:13 +0200 | [diff] [blame] | 1447 | static size_t save_page_header(RAMState *rs, QEMUFile *f, RAMBlock *block, |
| 1448 | ram_addr_t offset) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1449 | { |
Liang Li | 9f5f380 | 2015-07-13 17:34:10 +0800 | [diff] [blame] | 1450 | size_t size, len; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1451 | |
Juan Quintela | 2479569 | 2017-03-21 11:45:01 +0100 | [diff] [blame] | 1452 | if (block == rs->last_sent_block) { |
| 1453 | offset |= RAM_SAVE_FLAG_CONTINUE; |
| 1454 | } |
Juan Quintela | 2bf3aa8 | 2017-05-10 13:28:13 +0200 | [diff] [blame] | 1455 | qemu_put_be64(f, offset); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1456 | size = 8; |
| 1457 | |
| 1458 | if (!(offset & RAM_SAVE_FLAG_CONTINUE)) { |
Liang Li | 9f5f380 | 2015-07-13 17:34:10 +0800 | [diff] [blame] | 1459 | len = strlen(block->idstr); |
Juan Quintela | 2bf3aa8 | 2017-05-10 13:28:13 +0200 | [diff] [blame] | 1460 | qemu_put_byte(f, len); |
| 1461 | qemu_put_buffer(f, (uint8_t *)block->idstr, len); |
Liang Li | 9f5f380 | 2015-07-13 17:34:10 +0800 | [diff] [blame] | 1462 | size += 1 + len; |
Juan Quintela | 2479569 | 2017-03-21 11:45:01 +0100 | [diff] [blame] | 1463 | rs->last_sent_block = block; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1464 | } |
| 1465 | return size; |
| 1466 | } |
| 1467 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1468 | /** |
| 1469 | * mig_throttle_guest_down: throotle down the guest |
| 1470 | * |
| 1471 | * Reduce amount of guest cpu execution to hopefully slow down memory |
| 1472 | * writes. If guest dirty memory rate is reduced below the rate at |
| 1473 | * which we can transfer pages to the destination then we should be |
| 1474 | * able to complete migration. Some workloads dirty memory way too |
| 1475 | * fast and will not effectively converge, even with auto-converge. |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1476 | */ |
| 1477 | static void mig_throttle_guest_down(void) |
| 1478 | { |
| 1479 | MigrationState *s = migrate_get_current(); |
Daniel P. Berrange | 2594f56 | 2016-04-27 11:05:14 +0100 | [diff] [blame] | 1480 | uint64_t pct_initial = s->parameters.cpu_throttle_initial; |
| 1481 | uint64_t pct_icrement = s->parameters.cpu_throttle_increment; |
Li Qiang | 4cbc9c7 | 2018-08-01 06:00:20 -0700 | [diff] [blame] | 1482 | int pct_max = s->parameters.max_cpu_throttle; |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1483 | |
| 1484 | /* We have not started throttling yet. Let's start it. */ |
| 1485 | if (!cpu_throttle_active()) { |
| 1486 | cpu_throttle_set(pct_initial); |
| 1487 | } else { |
| 1488 | /* Throttling already on, just increase the rate */ |
Li Qiang | 4cbc9c7 | 2018-08-01 06:00:20 -0700 | [diff] [blame] | 1489 | cpu_throttle_set(MIN(cpu_throttle_get_percentage() + pct_icrement, |
| 1490 | pct_max)); |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1491 | } |
| 1492 | } |
| 1493 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1494 | /** |
| 1495 | * xbzrle_cache_zero_page: insert a zero page in the XBZRLE cache |
| 1496 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 1497 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1498 | * @current_addr: address for the zero page |
| 1499 | * |
| 1500 | * 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] | 1501 | * The important thing is that a stale (not-yet-0'd) page be replaced |
| 1502 | * by the new data. |
| 1503 | * 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] | 1504 | * 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] | 1505 | */ |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 1506 | 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] | 1507 | { |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 1508 | if (rs->ram_bulk_stage || !migrate_use_xbzrle()) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1509 | return; |
| 1510 | } |
| 1511 | |
| 1512 | /* We don't care if this fails to allocate a new cache page |
| 1513 | * as long as it updated an old one */ |
Juan Quintela | c00e092 | 2017-05-09 16:22:01 +0200 | [diff] [blame] | 1514 | cache_insert(XBZRLE.cache, current_addr, XBZRLE.zero_target_page, |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1515 | ram_counters.dirty_sync_count); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1516 | } |
| 1517 | |
| 1518 | #define ENCODING_FLAG_XBZRLE 0x1 |
| 1519 | |
| 1520 | /** |
| 1521 | * save_xbzrle_page: compress and send current page |
| 1522 | * |
| 1523 | * Returns: 1 means that we wrote the page |
| 1524 | * 0 means that page is identical to the one already sent |
| 1525 | * -1 means that xbzrle would be longer than normal |
| 1526 | * |
Juan Quintela | 5a98773 | 2017-03-13 19:39:02 +0100 | [diff] [blame] | 1527 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1528 | * @current_data: pointer to the address of the page contents |
| 1529 | * @current_addr: addr of the page |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1530 | * @block: block that contains the page we want to send |
| 1531 | * @offset: offset inside the block for the page |
| 1532 | * @last_stage: if we are at the completion stage |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1533 | */ |
Juan Quintela | 204b88b | 2017-03-15 09:16:57 +0100 | [diff] [blame] | 1534 | static int save_xbzrle_page(RAMState *rs, uint8_t **current_data, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1535 | ram_addr_t current_addr, RAMBlock *block, |
Juan Quintela | 072c251 | 2017-03-14 10:27:31 +0100 | [diff] [blame] | 1536 | ram_addr_t offset, bool last_stage) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1537 | { |
| 1538 | int encoded_len = 0, bytes_xbzrle; |
| 1539 | uint8_t *prev_cached_page; |
| 1540 | |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1541 | if (!cache_is_cached(XBZRLE.cache, current_addr, |
| 1542 | ram_counters.dirty_sync_count)) { |
| 1543 | xbzrle_counters.cache_miss++; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1544 | if (!last_stage) { |
| 1545 | if (cache_insert(XBZRLE.cache, current_addr, *current_data, |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1546 | ram_counters.dirty_sync_count) == -1) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1547 | return -1; |
| 1548 | } else { |
| 1549 | /* update *current_data when the page has been |
| 1550 | inserted into cache */ |
| 1551 | *current_data = get_cached_data(XBZRLE.cache, current_addr); |
| 1552 | } |
| 1553 | } |
| 1554 | return -1; |
| 1555 | } |
| 1556 | |
| 1557 | prev_cached_page = get_cached_data(XBZRLE.cache, current_addr); |
| 1558 | |
| 1559 | /* save current buffer into memory */ |
| 1560 | memcpy(XBZRLE.current_buf, *current_data, TARGET_PAGE_SIZE); |
| 1561 | |
| 1562 | /* XBZRLE encoding (if there is no overflow) */ |
| 1563 | encoded_len = xbzrle_encode_buffer(prev_cached_page, XBZRLE.current_buf, |
| 1564 | TARGET_PAGE_SIZE, XBZRLE.encoded_buf, |
| 1565 | TARGET_PAGE_SIZE); |
| 1566 | if (encoded_len == 0) { |
Juan Quintela | 55c4446 | 2017-01-23 22:32:05 +0100 | [diff] [blame] | 1567 | trace_save_xbzrle_page_skipping(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1568 | return 0; |
| 1569 | } else if (encoded_len == -1) { |
Juan Quintela | 55c4446 | 2017-01-23 22:32:05 +0100 | [diff] [blame] | 1570 | trace_save_xbzrle_page_overflow(); |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1571 | xbzrle_counters.overflow++; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1572 | /* update data in the cache */ |
| 1573 | if (!last_stage) { |
| 1574 | memcpy(prev_cached_page, *current_data, TARGET_PAGE_SIZE); |
| 1575 | *current_data = prev_cached_page; |
| 1576 | } |
| 1577 | return -1; |
| 1578 | } |
| 1579 | |
| 1580 | /* we need to update the data in the cache, in order to get the same data */ |
| 1581 | if (!last_stage) { |
| 1582 | memcpy(prev_cached_page, XBZRLE.current_buf, TARGET_PAGE_SIZE); |
| 1583 | } |
| 1584 | |
| 1585 | /* Send XBZRLE based compressed page */ |
Juan Quintela | 2bf3aa8 | 2017-05-10 13:28:13 +0200 | [diff] [blame] | 1586 | bytes_xbzrle = save_page_header(rs, rs->f, block, |
Juan Quintela | 204b88b | 2017-03-15 09:16:57 +0100 | [diff] [blame] | 1587 | offset | RAM_SAVE_FLAG_XBZRLE); |
| 1588 | qemu_put_byte(rs->f, ENCODING_FLAG_XBZRLE); |
| 1589 | qemu_put_be16(rs->f, encoded_len); |
| 1590 | qemu_put_buffer(rs->f, XBZRLE.encoded_buf, encoded_len); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1591 | bytes_xbzrle += encoded_len + 1 + 2; |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1592 | xbzrle_counters.pages++; |
| 1593 | xbzrle_counters.bytes += bytes_xbzrle; |
| 1594 | ram_counters.transferred += bytes_xbzrle; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1595 | |
| 1596 | return 1; |
| 1597 | } |
| 1598 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1599 | /** |
| 1600 | * 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] | 1601 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1602 | * Called with rcu_read_lock() to protect migration_bitmap |
| 1603 | * |
| 1604 | * Returns the byte offset within memory region of the start of a dirty page |
| 1605 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 1606 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1607 | * @rb: RAMBlock where to search for dirty pages |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 1608 | * @start: page where we start the search |
Dr. David Alan Gilbert | f3f491f | 2015-11-05 18:11:01 +0000 | [diff] [blame] | 1609 | */ |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1610 | static inline |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 1611 | unsigned long migration_bitmap_find_dirty(RAMState *rs, RAMBlock *rb, |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 1612 | unsigned long start) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1613 | { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1614 | unsigned long size = rb->used_length >> TARGET_PAGE_BITS; |
| 1615 | unsigned long *bitmap = rb->bmap; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1616 | unsigned long next; |
| 1617 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 1618 | if (ramblock_is_ignored(rb)) { |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 1619 | return size; |
| 1620 | } |
| 1621 | |
Wei Wang | 6eeb63f | 2018-12-11 16:24:52 +0800 | [diff] [blame] | 1622 | /* |
| 1623 | * When the free page optimization is enabled, we need to check the bitmap |
| 1624 | * to send the non-free pages rather than all the pages in the bulk stage. |
| 1625 | */ |
| 1626 | if (!rs->fpo_enabled && rs->ram_bulk_stage && start > 0) { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1627 | next = start + 1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1628 | } else { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1629 | next = find_next_bit(bitmap, size, start); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1630 | } |
| 1631 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1632 | return next; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1633 | } |
| 1634 | |
Juan Quintela | 06b1068 | 2017-03-21 15:18:05 +0100 | [diff] [blame] | 1635 | static inline bool migration_bitmap_clear_dirty(RAMState *rs, |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 1636 | RAMBlock *rb, |
| 1637 | unsigned long page) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 1638 | { |
| 1639 | bool ret; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 1640 | |
Wei Wang | 386a907 | 2018-12-11 16:24:49 +0800 | [diff] [blame] | 1641 | qemu_mutex_lock(&rs->bitmap_mutex); |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1642 | ret = test_and_clear_bit(page, rb->bmap); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 1643 | |
| 1644 | if (ret) { |
Juan Quintela | 0d8ec88 | 2017-03-13 21:21:41 +0100 | [diff] [blame] | 1645 | rs->migration_dirty_pages--; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 1646 | } |
Wei Wang | 386a907 | 2018-12-11 16:24:49 +0800 | [diff] [blame] | 1647 | qemu_mutex_unlock(&rs->bitmap_mutex); |
| 1648 | |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 1649 | return ret; |
| 1650 | } |
| 1651 | |
Juan Quintela | 15440dd | 2017-03-21 09:35:04 +0100 | [diff] [blame] | 1652 | static void migration_bitmap_sync_range(RAMState *rs, RAMBlock *rb, |
| 1653 | ram_addr_t start, ram_addr_t length) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1654 | { |
Juan Quintela | 0d8ec88 | 2017-03-13 21:21:41 +0100 | [diff] [blame] | 1655 | rs->migration_dirty_pages += |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 1656 | cpu_physical_memory_sync_dirty_bitmap(rb, start, length, |
Juan Quintela | 0d8ec88 | 2017-03-13 21:21:41 +0100 | [diff] [blame] | 1657 | &rs->num_dirty_pages_period); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1658 | } |
| 1659 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1660 | /** |
| 1661 | * ram_pagesize_summary: calculate all the pagesizes of a VM |
| 1662 | * |
| 1663 | * Returns a summary bitmap of the page sizes of all RAMBlocks |
| 1664 | * |
| 1665 | * For VMs with just normal pages this is equivalent to the host page |
| 1666 | * size. If it's got some huge pages then it's the OR of all the |
| 1667 | * different page sizes. |
Dr. David Alan Gilbert | e8ca1db | 2017-02-24 18:28:29 +0000 | [diff] [blame] | 1668 | */ |
| 1669 | uint64_t ram_pagesize_summary(void) |
| 1670 | { |
| 1671 | RAMBlock *block; |
| 1672 | uint64_t summary = 0; |
| 1673 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 1674 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Dr. David Alan Gilbert | e8ca1db | 2017-02-24 18:28:29 +0000 | [diff] [blame] | 1675 | summary |= block->page_size; |
| 1676 | } |
| 1677 | |
| 1678 | return summary; |
| 1679 | } |
| 1680 | |
Xiao Guangrong | aecbfe9 | 2019-01-11 14:37:30 +0800 | [diff] [blame] | 1681 | uint64_t ram_get_total_transferred_pages(void) |
| 1682 | { |
| 1683 | return ram_counters.normal + ram_counters.duplicate + |
| 1684 | compression_counters.pages + xbzrle_counters.pages; |
| 1685 | } |
| 1686 | |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1687 | static void migration_update_rates(RAMState *rs, int64_t end_time) |
| 1688 | { |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 1689 | 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] | 1690 | double compressed_size; |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1691 | |
| 1692 | /* calculate period counters */ |
| 1693 | ram_counters.dirty_pages_rate = rs->num_dirty_pages_period * 1000 |
| 1694 | / (end_time - rs->time_last_bitmap_sync); |
| 1695 | |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 1696 | if (!page_count) { |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1697 | return; |
| 1698 | } |
| 1699 | |
| 1700 | if (migrate_use_xbzrle()) { |
| 1701 | xbzrle_counters.cache_miss_rate = (double)(xbzrle_counters.cache_miss - |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 1702 | rs->xbzrle_cache_miss_prev) / page_count; |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1703 | rs->xbzrle_cache_miss_prev = xbzrle_counters.cache_miss; |
| 1704 | } |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 1705 | |
| 1706 | if (migrate_use_compression()) { |
| 1707 | compression_counters.busy_rate = (double)(compression_counters.busy - |
| 1708 | rs->compress_thread_busy_prev) / page_count; |
| 1709 | rs->compress_thread_busy_prev = compression_counters.busy; |
| 1710 | |
| 1711 | compressed_size = compression_counters.compressed_size - |
| 1712 | rs->compressed_size_prev; |
| 1713 | if (compressed_size) { |
| 1714 | double uncompressed_size = (compression_counters.pages - |
| 1715 | rs->compress_pages_prev) * TARGET_PAGE_SIZE; |
| 1716 | |
| 1717 | /* Compression-Ratio = Uncompressed-size / Compressed-size */ |
| 1718 | compression_counters.compression_rate = |
| 1719 | uncompressed_size / compressed_size; |
| 1720 | |
| 1721 | rs->compress_pages_prev = compression_counters.pages; |
| 1722 | rs->compressed_size_prev = compression_counters.compressed_size; |
| 1723 | } |
| 1724 | } |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1725 | } |
| 1726 | |
Juan Quintela | 8d820d6 | 2017-03-13 19:35:50 +0100 | [diff] [blame] | 1727 | static void migration_bitmap_sync(RAMState *rs) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1728 | { |
| 1729 | RAMBlock *block; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1730 | int64_t end_time; |
Juan Quintela | c4bdf0c | 2017-03-28 14:59:54 +0200 | [diff] [blame] | 1731 | uint64_t bytes_xfer_now; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1732 | |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1733 | ram_counters.dirty_sync_count++; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1734 | |
Juan Quintela | f664da8 | 2017-03-13 19:44:57 +0100 | [diff] [blame] | 1735 | if (!rs->time_last_bitmap_sync) { |
| 1736 | rs->time_last_bitmap_sync = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1737 | } |
| 1738 | |
| 1739 | trace_migration_bitmap_sync_start(); |
Paolo Bonzini | 9c1f8f4 | 2016-09-22 16:08:31 +0200 | [diff] [blame] | 1740 | memory_global_dirty_log_sync(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1741 | |
Juan Quintela | 108cfae | 2017-03-13 21:38:09 +0100 | [diff] [blame] | 1742 | qemu_mutex_lock(&rs->bitmap_mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1743 | rcu_read_lock(); |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 1744 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Juan Quintela | 15440dd | 2017-03-21 09:35:04 +0100 | [diff] [blame] | 1745 | migration_bitmap_sync_range(rs, block, 0, block->used_length); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1746 | } |
Balamuruhan S | 650af89 | 2018-06-12 14:20:09 +0530 | [diff] [blame] | 1747 | ram_counters.remaining = ram_bytes_remaining(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1748 | rcu_read_unlock(); |
Juan Quintela | 108cfae | 2017-03-13 21:38:09 +0100 | [diff] [blame] | 1749 | qemu_mutex_unlock(&rs->bitmap_mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1750 | |
Juan Quintela | a66cd90 | 2017-03-28 15:02:43 +0200 | [diff] [blame] | 1751 | trace_migration_bitmap_sync_end(rs->num_dirty_pages_period); |
Chao Fan | 1ffb5df | 2017-03-14 09:55:07 +0800 | [diff] [blame] | 1752 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1753 | end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
| 1754 | |
| 1755 | /* more than 1 second = 1000 millisecons */ |
Juan Quintela | f664da8 | 2017-03-13 19:44:57 +0100 | [diff] [blame] | 1756 | if (end_time > rs->time_last_bitmap_sync + 1000) { |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1757 | bytes_xfer_now = ram_counters.transferred; |
Felipe Franciosi | d693c6f | 2017-05-24 17:10:01 +0100 | [diff] [blame] | 1758 | |
Peter Lieven | 9ac78b6 | 2017-09-26 12:33:16 +0200 | [diff] [blame] | 1759 | /* During block migration the auto-converge logic incorrectly detects |
| 1760 | * that ram migration makes no progress. Avoid this by disabling the |
| 1761 | * throttling logic during the bulk phase of block migration. */ |
| 1762 | if (migrate_auto_converge() && !blk_mig_bulk_active()) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1763 | /* The following detection logic can be refined later. For now: |
| 1764 | Check to see if the dirtied bytes is 50% more than the approx. |
| 1765 | 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] | 1766 | were in this routine. If that happens twice, start or increase |
| 1767 | throttling */ |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1768 | |
Felipe Franciosi | d693c6f | 2017-05-24 17:10:01 +0100 | [diff] [blame] | 1769 | if ((rs->num_dirty_pages_period * TARGET_PAGE_SIZE > |
Juan Quintela | eac7415 | 2017-03-28 14:59:01 +0200 | [diff] [blame] | 1770 | (bytes_xfer_now - rs->bytes_xfer_prev) / 2) && |
Felipe Franciosi | b4a3c64 | 2017-05-24 17:10:03 +0100 | [diff] [blame] | 1771 | (++rs->dirty_rate_high_cnt >= 2)) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1772 | trace_migration_throttle(); |
Juan Quintela | 8d820d6 | 2017-03-13 19:35:50 +0100 | [diff] [blame] | 1773 | rs->dirty_rate_high_cnt = 0; |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1774 | mig_throttle_guest_down(); |
Felipe Franciosi | d693c6f | 2017-05-24 17:10:01 +0100 | [diff] [blame] | 1775 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1776 | } |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 1777 | |
Xiao Guangrong | b734035 | 2018-06-04 17:55:12 +0800 | [diff] [blame] | 1778 | migration_update_rates(rs, end_time); |
| 1779 | |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 1780 | rs->target_page_count_prev = rs->target_page_count; |
Felipe Franciosi | d693c6f | 2017-05-24 17:10:01 +0100 | [diff] [blame] | 1781 | |
| 1782 | /* reset period counters */ |
Juan Quintela | f664da8 | 2017-03-13 19:44:57 +0100 | [diff] [blame] | 1783 | rs->time_last_bitmap_sync = end_time; |
Juan Quintela | a66cd90 | 2017-03-28 15:02:43 +0200 | [diff] [blame] | 1784 | rs->num_dirty_pages_period = 0; |
Felipe Franciosi | d2a4d85 | 2017-05-24 17:10:02 +0100 | [diff] [blame] | 1785 | rs->bytes_xfer_prev = bytes_xfer_now; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1786 | } |
Dr. David Alan Gilbert | 4addcd4 | 2015-12-16 11:47:36 +0000 | [diff] [blame] | 1787 | if (migrate_use_events()) { |
Peter Xu | 3ab7238 | 2018-08-15 21:37:37 +0800 | [diff] [blame] | 1788 | qapi_event_send_migration_pass(ram_counters.dirty_sync_count); |
Dr. David Alan Gilbert | 4addcd4 | 2015-12-16 11:47:36 +0000 | [diff] [blame] | 1789 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1790 | } |
| 1791 | |
Wei Wang | bd22706 | 2018-12-11 16:24:51 +0800 | [diff] [blame] | 1792 | static void migration_bitmap_sync_precopy(RAMState *rs) |
| 1793 | { |
| 1794 | Error *local_err = NULL; |
| 1795 | |
| 1796 | /* |
| 1797 | * The current notifier usage is just an optimization to migration, so we |
| 1798 | * don't stop the normal migration process in the error case. |
| 1799 | */ |
| 1800 | if (precopy_notify(PRECOPY_NOTIFY_BEFORE_BITMAP_SYNC, &local_err)) { |
| 1801 | error_report_err(local_err); |
| 1802 | } |
| 1803 | |
| 1804 | migration_bitmap_sync(rs); |
| 1805 | |
| 1806 | if (precopy_notify(PRECOPY_NOTIFY_AFTER_BITMAP_SYNC, &local_err)) { |
| 1807 | error_report_err(local_err); |
| 1808 | } |
| 1809 | } |
| 1810 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1811 | /** |
Xiao Guangrong | 6c97ec5 | 2018-08-21 16:10:22 +0800 | [diff] [blame] | 1812 | * save_zero_page_to_file: send the zero page to the file |
| 1813 | * |
| 1814 | * Returns the size of data written to the file, 0 means the page is not |
| 1815 | * a zero page |
| 1816 | * |
| 1817 | * @rs: current RAM state |
| 1818 | * @file: the file where the data is saved |
| 1819 | * @block: block that contains the page we want to send |
| 1820 | * @offset: offset inside the block for the page |
| 1821 | */ |
| 1822 | static int save_zero_page_to_file(RAMState *rs, QEMUFile *file, |
| 1823 | RAMBlock *block, ram_addr_t offset) |
| 1824 | { |
| 1825 | uint8_t *p = block->host + offset; |
| 1826 | int len = 0; |
| 1827 | |
| 1828 | if (is_zero_range(p, TARGET_PAGE_SIZE)) { |
| 1829 | len += save_page_header(rs, file, block, offset | RAM_SAVE_FLAG_ZERO); |
| 1830 | qemu_put_byte(file, 0); |
| 1831 | len += 1; |
| 1832 | } |
| 1833 | return len; |
| 1834 | } |
| 1835 | |
| 1836 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1837 | * save_zero_page: send the zero page to the stream |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1838 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1839 | * Returns the number of pages written. |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1840 | * |
Juan Quintela | f7ccd61 | 2017-03-13 20:30:21 +0100 | [diff] [blame] | 1841 | * @rs: current RAM state |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1842 | * @block: block that contains the page we want to send |
| 1843 | * @offset: offset inside the block for the page |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1844 | */ |
Juan Quintela | 7faccdc | 2018-01-08 18:58:17 +0100 | [diff] [blame] | 1845 | 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] | 1846 | { |
Xiao Guangrong | 6c97ec5 | 2018-08-21 16:10:22 +0800 | [diff] [blame] | 1847 | int len = save_zero_page_to_file(rs, rs->f, block, offset); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1848 | |
Xiao Guangrong | 6c97ec5 | 2018-08-21 16:10:22 +0800 | [diff] [blame] | 1849 | if (len) { |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 1850 | ram_counters.duplicate++; |
Xiao Guangrong | 6c97ec5 | 2018-08-21 16:10:22 +0800 | [diff] [blame] | 1851 | ram_counters.transferred += len; |
| 1852 | return 1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1853 | } |
Xiao Guangrong | 6c97ec5 | 2018-08-21 16:10:22 +0800 | [diff] [blame] | 1854 | return -1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1855 | } |
| 1856 | |
Juan Quintela | 5727309 | 2017-03-20 22:25:28 +0100 | [diff] [blame] | 1857 | 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] | 1858 | { |
Juan Quintela | 5727309 | 2017-03-20 22:25:28 +0100 | [diff] [blame] | 1859 | if (!migrate_release_ram() || !migration_in_postcopy()) { |
Pavel Butsykin | 53f09a1 | 2017-02-03 18:23:20 +0300 | [diff] [blame] | 1860 | return; |
| 1861 | } |
| 1862 | |
Juan Quintela | aaa2064 | 2017-03-21 11:35:24 +0100 | [diff] [blame] | 1863 | ram_discard_range(rbname, offset, pages << TARGET_PAGE_BITS); |
Pavel Butsykin | 53f09a1 | 2017-02-03 18:23:20 +0300 | [diff] [blame] | 1864 | } |
| 1865 | |
Xiao Guangrong | 059ff0f | 2018-03-30 15:51:23 +0800 | [diff] [blame] | 1866 | /* |
| 1867 | * @pages: the number of pages written by the control path, |
| 1868 | * < 0 - error |
| 1869 | * > 0 - number of pages written |
| 1870 | * |
| 1871 | * Return true if the pages has been saved, otherwise false is returned. |
| 1872 | */ |
| 1873 | static bool control_save_page(RAMState *rs, RAMBlock *block, ram_addr_t offset, |
| 1874 | int *pages) |
| 1875 | { |
| 1876 | uint64_t bytes_xmit = 0; |
| 1877 | int ret; |
| 1878 | |
| 1879 | *pages = -1; |
| 1880 | ret = ram_control_save_page(rs->f, block->offset, offset, TARGET_PAGE_SIZE, |
| 1881 | &bytes_xmit); |
| 1882 | if (ret == RAM_SAVE_CONTROL_NOT_SUPP) { |
| 1883 | return false; |
| 1884 | } |
| 1885 | |
| 1886 | if (bytes_xmit) { |
| 1887 | ram_counters.transferred += bytes_xmit; |
| 1888 | *pages = 1; |
| 1889 | } |
| 1890 | |
| 1891 | if (ret == RAM_SAVE_CONTROL_DELAYED) { |
| 1892 | return true; |
| 1893 | } |
| 1894 | |
| 1895 | if (bytes_xmit > 0) { |
| 1896 | ram_counters.normal++; |
| 1897 | } else if (bytes_xmit == 0) { |
| 1898 | ram_counters.duplicate++; |
| 1899 | } |
| 1900 | |
| 1901 | return true; |
| 1902 | } |
| 1903 | |
Xiao Guangrong | 65dacaa | 2018-03-30 15:51:27 +0800 | [diff] [blame] | 1904 | /* |
| 1905 | * directly send the page to the stream |
| 1906 | * |
| 1907 | * Returns the number of pages written. |
| 1908 | * |
| 1909 | * @rs: current RAM state |
| 1910 | * @block: block that contains the page we want to send |
| 1911 | * @offset: offset inside the block for the page |
| 1912 | * @buf: the page to be sent |
| 1913 | * @async: send to page asyncly |
| 1914 | */ |
| 1915 | static int save_normal_page(RAMState *rs, RAMBlock *block, ram_addr_t offset, |
| 1916 | uint8_t *buf, bool async) |
| 1917 | { |
| 1918 | ram_counters.transferred += save_page_header(rs, rs->f, block, |
| 1919 | offset | RAM_SAVE_FLAG_PAGE); |
| 1920 | if (async) { |
| 1921 | qemu_put_buffer_async(rs->f, buf, TARGET_PAGE_SIZE, |
| 1922 | migrate_release_ram() & |
| 1923 | migration_in_postcopy()); |
| 1924 | } else { |
| 1925 | qemu_put_buffer(rs->f, buf, TARGET_PAGE_SIZE); |
| 1926 | } |
| 1927 | ram_counters.transferred += TARGET_PAGE_SIZE; |
| 1928 | ram_counters.normal++; |
| 1929 | return 1; |
| 1930 | } |
| 1931 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1932 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1933 | * ram_save_page: send the given page to the stream |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1934 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 1935 | * Returns the number of pages written. |
Dr. David Alan Gilbert | 3fd3c4b | 2015-12-10 16:31:46 +0000 | [diff] [blame] | 1936 | * < 0 - error |
| 1937 | * >=0 - Number of pages written - this might legally be 0 |
| 1938 | * if xbzrle noticed the page was the same. |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1939 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 1940 | * @rs: current RAM state |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1941 | * @block: block that contains the page we want to send |
| 1942 | * @offset: offset inside the block for the page |
| 1943 | * @last_stage: if we are at the completion stage |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1944 | */ |
Juan Quintela | a0a8aa1 | 2017-03-20 22:29:07 +0100 | [diff] [blame] | 1945 | static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1946 | { |
| 1947 | int pages = -1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1948 | uint8_t *p; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1949 | bool send_async = true; |
zhanghailiang | a08f689 | 2016-01-15 11:37:44 +0800 | [diff] [blame] | 1950 | RAMBlock *block = pss->block; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 1951 | ram_addr_t offset = pss->page << TARGET_PAGE_BITS; |
Xiao Guangrong | 059ff0f | 2018-03-30 15:51:23 +0800 | [diff] [blame] | 1952 | ram_addr_t current_addr = block->offset + offset; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1953 | |
Dr. David Alan Gilbert | 2f68e39 | 2015-08-13 11:51:30 +0100 | [diff] [blame] | 1954 | p = block->host + offset; |
Dr. David Alan Gilbert | 1db9d8e | 2017-04-26 19:37:21 +0100 | [diff] [blame] | 1955 | trace_ram_save_page(block->idstr, (uint64_t)offset, p); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1956 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1957 | XBZRLE_cache_lock(); |
Xiao Guangrong | d7400a3 | 2018-03-30 15:51:26 +0800 | [diff] [blame] | 1958 | if (!rs->ram_bulk_stage && !migration_in_postcopy() && |
| 1959 | migrate_use_xbzrle()) { |
Xiao Guangrong | 059ff0f | 2018-03-30 15:51:23 +0800 | [diff] [blame] | 1960 | pages = save_xbzrle_page(rs, &p, current_addr, block, |
| 1961 | offset, last_stage); |
| 1962 | if (!last_stage) { |
| 1963 | /* Can't send this cached data async, since the cache page |
| 1964 | * might get updated before it gets to the wire |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1965 | */ |
Xiao Guangrong | 059ff0f | 2018-03-30 15:51:23 +0800 | [diff] [blame] | 1966 | send_async = false; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1967 | } |
| 1968 | } |
| 1969 | |
| 1970 | /* XBZRLE overflow or normal page */ |
| 1971 | if (pages == -1) { |
Xiao Guangrong | 65dacaa | 2018-03-30 15:51:27 +0800 | [diff] [blame] | 1972 | pages = save_normal_page(rs, block, offset, p, send_async); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1973 | } |
| 1974 | |
| 1975 | XBZRLE_cache_unlock(); |
| 1976 | |
| 1977 | return pages; |
| 1978 | } |
| 1979 | |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1980 | static int ram_save_multifd_page(RAMState *rs, RAMBlock *block, |
| 1981 | ram_addr_t offset) |
| 1982 | { |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1983 | multifd_queue_page(block, offset); |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 1984 | ram_counters.normal++; |
| 1985 | |
| 1986 | return 1; |
| 1987 | } |
| 1988 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 1989 | 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] | 1990 | ram_addr_t offset, uint8_t *source_buf) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1991 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 1992 | RAMState *rs = ram_state; |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 1993 | uint8_t *p = block->host + (offset & TARGET_PAGE_MASK); |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 1994 | bool zero_page = false; |
Xiao Guangrong | 6ef3771 | 2018-08-21 16:10:23 +0800 | [diff] [blame] | 1995 | int ret; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 1996 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 1997 | if (save_zero_page_to_file(rs, f, block, offset)) { |
| 1998 | zero_page = true; |
| 1999 | goto exit; |
| 2000 | } |
| 2001 | |
Xiao Guangrong | 6ef3771 | 2018-08-21 16:10:23 +0800 | [diff] [blame] | 2002 | save_page_header(rs, f, block, offset | RAM_SAVE_FLAG_COMPRESS_PAGE); |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 2003 | |
| 2004 | /* |
| 2005 | * copy it to a internal buffer to avoid it being modified by VM |
| 2006 | * so that we can catch up the error during compression and |
| 2007 | * decompression |
| 2008 | */ |
| 2009 | memcpy(source_buf, p, TARGET_PAGE_SIZE); |
Xiao Guangrong | 6ef3771 | 2018-08-21 16:10:23 +0800 | [diff] [blame] | 2010 | ret = qemu_put_compression_data(f, stream, source_buf, TARGET_PAGE_SIZE); |
| 2011 | if (ret < 0) { |
| 2012 | qemu_file_set_error(migrate_get_current()->to_dst_file, ret); |
Liang Li | b3be289 | 2016-05-05 15:32:54 +0800 | [diff] [blame] | 2013 | error_report("compressed data failed!"); |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2014 | return false; |
Liang Li | b3be289 | 2016-05-05 15:32:54 +0800 | [diff] [blame] | 2015 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2016 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2017 | exit: |
Xiao Guangrong | 6ef3771 | 2018-08-21 16:10:23 +0800 | [diff] [blame] | 2018 | ram_release_pages(block->idstr, offset & TARGET_PAGE_MASK, 1); |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2019 | return zero_page; |
| 2020 | } |
| 2021 | |
| 2022 | static void |
| 2023 | update_compress_thread_counts(const CompressParam *param, int bytes_xmit) |
| 2024 | { |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 2025 | ram_counters.transferred += bytes_xmit; |
| 2026 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2027 | if (param->zero_page) { |
| 2028 | ram_counters.duplicate++; |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 2029 | return; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2030 | } |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 2031 | |
| 2032 | /* 8 means a header with RAM_SAVE_FLAG_CONTINUE. */ |
| 2033 | compression_counters.compressed_size += bytes_xmit - 8; |
| 2034 | compression_counters.pages++; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2035 | } |
| 2036 | |
Xiao Guangrong | 32b0549 | 2018-09-06 15:01:01 +0800 | [diff] [blame] | 2037 | static bool save_page_use_compression(RAMState *rs); |
| 2038 | |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 2039 | static void flush_compressed_data(RAMState *rs) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2040 | { |
| 2041 | int idx, len, thread_count; |
| 2042 | |
Xiao Guangrong | 32b0549 | 2018-09-06 15:01:01 +0800 | [diff] [blame] | 2043 | if (!save_page_use_compression(rs)) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2044 | return; |
| 2045 | } |
| 2046 | thread_count = migrate_compress_threads(); |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2047 | |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 2048 | qemu_mutex_lock(&comp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2049 | for (idx = 0; idx < thread_count; idx++) { |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2050 | while (!comp_param[idx].done) { |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 2051 | qemu_cond_wait(&comp_done_cond, &comp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2052 | } |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2053 | } |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 2054 | qemu_mutex_unlock(&comp_done_lock); |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2055 | |
| 2056 | for (idx = 0; idx < thread_count; idx++) { |
| 2057 | qemu_mutex_lock(&comp_param[idx].mutex); |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 2058 | if (!comp_param[idx].quit) { |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 2059 | len = qemu_put_qemu_file(rs->f, comp_param[idx].file); |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2060 | /* |
| 2061 | * it's safe to fetch zero_page without holding comp_done_lock |
| 2062 | * as there is no further request submitted to the thread, |
| 2063 | * i.e, the thread should be waiting for a request at this point. |
| 2064 | */ |
| 2065 | update_compress_thread_counts(&comp_param[idx], len); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2066 | } |
Liang Li | a7a9a88 | 2016-05-05 15:32:57 +0800 | [diff] [blame] | 2067 | qemu_mutex_unlock(&comp_param[idx].mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2068 | } |
| 2069 | } |
| 2070 | |
| 2071 | static inline void set_compress_params(CompressParam *param, RAMBlock *block, |
| 2072 | ram_addr_t offset) |
| 2073 | { |
| 2074 | param->block = block; |
| 2075 | param->offset = offset; |
| 2076 | } |
| 2077 | |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 2078 | static int compress_page_with_multi_thread(RAMState *rs, RAMBlock *block, |
| 2079 | ram_addr_t offset) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2080 | { |
| 2081 | int idx, thread_count, bytes_xmit = -1, pages = -1; |
Xiao Guangrong | 1d58872 | 2018-08-21 16:10:20 +0800 | [diff] [blame] | 2082 | bool wait = migrate_compress_wait_thread(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2083 | |
| 2084 | thread_count = migrate_compress_threads(); |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 2085 | qemu_mutex_lock(&comp_done_lock); |
Xiao Guangrong | 1d58872 | 2018-08-21 16:10:20 +0800 | [diff] [blame] | 2086 | retry: |
| 2087 | for (idx = 0; idx < thread_count; idx++) { |
| 2088 | if (comp_param[idx].done) { |
| 2089 | comp_param[idx].done = false; |
| 2090 | bytes_xmit = qemu_put_qemu_file(rs->f, comp_param[idx].file); |
| 2091 | qemu_mutex_lock(&comp_param[idx].mutex); |
| 2092 | set_compress_params(&comp_param[idx], block, offset); |
| 2093 | qemu_cond_signal(&comp_param[idx].cond); |
| 2094 | qemu_mutex_unlock(&comp_param[idx].mutex); |
| 2095 | pages = 1; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2096 | update_compress_thread_counts(&comp_param[idx], bytes_xmit); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2097 | break; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2098 | } |
| 2099 | } |
Xiao Guangrong | 1d58872 | 2018-08-21 16:10:20 +0800 | [diff] [blame] | 2100 | |
| 2101 | /* |
| 2102 | * wait for the free thread if the user specifies 'compress-wait-thread', |
| 2103 | * otherwise we will post the page out in the main thread as normal page. |
| 2104 | */ |
| 2105 | if (pages < 0 && wait) { |
| 2106 | qemu_cond_wait(&comp_done_cond, &comp_done_lock); |
| 2107 | goto retry; |
| 2108 | } |
Liang Li | 0d9f9a5 | 2016-05-05 15:32:59 +0800 | [diff] [blame] | 2109 | qemu_mutex_unlock(&comp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2110 | |
| 2111 | return pages; |
| 2112 | } |
| 2113 | |
| 2114 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2115 | * find_dirty_block: find the next dirty page and update any state |
| 2116 | * associated with the search process. |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2117 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2118 | * Returns if a page is found |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2119 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2120 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2121 | * @pss: data about the state of the current dirty page scan |
| 2122 | * @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] | 2123 | */ |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2124 | 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] | 2125 | { |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2126 | pss->page = migration_bitmap_find_dirty(rs, pss->block, pss->page); |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2127 | if (pss->complete_round && pss->block == rs->last_seen_block && |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2128 | pss->page >= rs->last_page) { |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2129 | /* |
| 2130 | * We've been once around the RAM and haven't found anything. |
| 2131 | * Give up. |
| 2132 | */ |
| 2133 | *again = false; |
| 2134 | return false; |
| 2135 | } |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2136 | if ((pss->page << TARGET_PAGE_BITS) >= pss->block->used_length) { |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2137 | /* Didn't find anything in this RAM Block */ |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2138 | pss->page = 0; |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2139 | pss->block = QLIST_NEXT_RCU(pss->block, next); |
| 2140 | if (!pss->block) { |
Xiao Guangrong | 48df9d8 | 2018-09-06 15:00:59 +0800 | [diff] [blame] | 2141 | /* |
| 2142 | * If memory migration starts over, we will meet a dirtied page |
| 2143 | * which may still exists in compression threads's ring, so we |
| 2144 | * should flush the compressed data to make sure the new page |
| 2145 | * is not overwritten by the old one in the destination. |
| 2146 | * |
| 2147 | * Also If xbzrle is on, stop using the data compression at this |
| 2148 | * point. In theory, xbzrle can do better than compression. |
| 2149 | */ |
| 2150 | flush_compressed_data(rs); |
| 2151 | |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2152 | /* Hit the end of the list */ |
| 2153 | pss->block = QLIST_FIRST_RCU(&ram_list.blocks); |
| 2154 | /* Flag that we've looped */ |
| 2155 | pss->complete_round = true; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2156 | rs->ram_bulk_stage = false; |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2157 | } |
| 2158 | /* Didn't find anything this time, but try again on the new block */ |
| 2159 | *again = true; |
| 2160 | return false; |
| 2161 | } else { |
| 2162 | /* Can go around again, but... */ |
| 2163 | *again = true; |
| 2164 | /* We've found something so probably don't need to */ |
| 2165 | return true; |
| 2166 | } |
| 2167 | } |
| 2168 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2169 | /** |
| 2170 | * unqueue_page: gets a page of the queue |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2171 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2172 | * Helper for 'get_queued_page' - gets a page off the queue |
| 2173 | * |
| 2174 | * Returns the block of the page (or NULL if none available) |
| 2175 | * |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2176 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2177 | * @offset: used to return the offset within the RAMBlock |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2178 | */ |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2179 | static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2180 | { |
| 2181 | RAMBlock *block = NULL; |
| 2182 | |
Xiao Guangrong | ae526e3 | 2018-08-21 16:10:25 +0800 | [diff] [blame] | 2183 | if (QSIMPLEQ_EMPTY_ATOMIC(&rs->src_page_requests)) { |
| 2184 | return NULL; |
| 2185 | } |
| 2186 | |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2187 | qemu_mutex_lock(&rs->src_page_req_mutex); |
| 2188 | if (!QSIMPLEQ_EMPTY(&rs->src_page_requests)) { |
| 2189 | struct RAMSrcPageRequest *entry = |
| 2190 | QSIMPLEQ_FIRST(&rs->src_page_requests); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2191 | block = entry->rb; |
| 2192 | *offset = entry->offset; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2193 | |
| 2194 | if (entry->len > TARGET_PAGE_SIZE) { |
| 2195 | entry->len -= TARGET_PAGE_SIZE; |
| 2196 | entry->offset += TARGET_PAGE_SIZE; |
| 2197 | } else { |
| 2198 | memory_region_unref(block->mr); |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2199 | QSIMPLEQ_REMOVE_HEAD(&rs->src_page_requests, next_req); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2200 | g_free(entry); |
Dr. David Alan Gilbert | e03a34f | 2018-06-13 11:26:42 +0100 | [diff] [blame] | 2201 | migration_consume_urgent_request(); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2202 | } |
| 2203 | } |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2204 | qemu_mutex_unlock(&rs->src_page_req_mutex); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2205 | |
| 2206 | return block; |
| 2207 | } |
| 2208 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2209 | /** |
| 2210 | * get_queued_page: unqueue a page from the postocpy requests |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2211 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2212 | * Skips pages that are already sent (!dirty) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2213 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2214 | * Returns if a queued page is found |
| 2215 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2216 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2217 | * @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] | 2218 | */ |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2219 | static bool get_queued_page(RAMState *rs, PageSearchStatus *pss) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2220 | { |
| 2221 | RAMBlock *block; |
| 2222 | ram_addr_t offset; |
| 2223 | bool dirty; |
| 2224 | |
| 2225 | do { |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2226 | block = unqueue_page(rs, &offset); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2227 | /* |
| 2228 | * We're sending this page, and since it's postcopy nothing else |
| 2229 | * will dirty it, and we must make sure it doesn't get sent again |
| 2230 | * even if this queue request was received after the background |
| 2231 | * search already sent it. |
| 2232 | */ |
| 2233 | if (block) { |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2234 | unsigned long page; |
| 2235 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2236 | page = offset >> TARGET_PAGE_BITS; |
| 2237 | dirty = test_bit(page, block->bmap); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2238 | if (!dirty) { |
Juan Quintela | 06b1068 | 2017-03-21 15:18:05 +0100 | [diff] [blame] | 2239 | trace_get_queued_page_not_dirty(block->idstr, (uint64_t)offset, |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2240 | page, test_bit(page, block->unsentmap)); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2241 | } else { |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2242 | trace_get_queued_page(block->idstr, (uint64_t)offset, page); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2243 | } |
| 2244 | } |
| 2245 | |
| 2246 | } while (block && !dirty); |
| 2247 | |
| 2248 | if (block) { |
| 2249 | /* |
| 2250 | * As soon as we start servicing pages out of order, then we have |
| 2251 | * to kill the bulk stage, since the bulk stage assumes |
| 2252 | * in (migration_bitmap_find_and_reset_dirty) that every page is |
| 2253 | * dirty, that's no longer true. |
| 2254 | */ |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2255 | rs->ram_bulk_stage = false; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2256 | |
| 2257 | /* |
| 2258 | * We want the background search to continue from the queued page |
| 2259 | * since the guest is likely to want other pages near to the page |
| 2260 | * it just requested. |
| 2261 | */ |
| 2262 | pss->block = block; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2263 | pss->page = offset >> TARGET_PAGE_BITS; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2264 | } |
| 2265 | |
| 2266 | return !!block; |
| 2267 | } |
| 2268 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2269 | /** |
Juan Quintela | 5e58f96 | 2017-04-03 22:06:54 +0200 | [diff] [blame] | 2270 | * migration_page_queue_free: drop any remaining pages in the ram |
| 2271 | * request queue |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2272 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2273 | * It should be empty at the end anyway, but in error cases there may |
| 2274 | * be some left. in case that there is any page left, we drop it. |
| 2275 | * |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2276 | */ |
Juan Quintela | 83c1338 | 2017-05-04 11:45:01 +0200 | [diff] [blame] | 2277 | static void migration_page_queue_free(RAMState *rs) |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2278 | { |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2279 | struct RAMSrcPageRequest *mspr, *next_mspr; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2280 | /* This queue generally should be empty - but in the case of a failed |
| 2281 | * migration might have some droppings in. |
| 2282 | */ |
| 2283 | rcu_read_lock(); |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2284 | 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] | 2285 | memory_region_unref(mspr->rb->mr); |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2286 | QSIMPLEQ_REMOVE_HEAD(&rs->src_page_requests, next_req); |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2287 | g_free(mspr); |
| 2288 | } |
| 2289 | rcu_read_unlock(); |
| 2290 | } |
| 2291 | |
| 2292 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2293 | * ram_save_queue_pages: queue the page for transmission |
| 2294 | * |
| 2295 | * A request from postcopy destination for example. |
| 2296 | * |
| 2297 | * Returns zero on success or negative on error |
| 2298 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2299 | * @rbname: Name of the RAMBLock of the request. NULL means the |
| 2300 | * same that last one. |
| 2301 | * @start: starting address from the start of the RAMBlock |
| 2302 | * @len: length (in bytes) to send |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2303 | */ |
Juan Quintela | 9650689 | 2017-03-14 18:41:03 +0100 | [diff] [blame] | 2304 | 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] | 2305 | { |
| 2306 | RAMBlock *ramblock; |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 2307 | RAMState *rs = ram_state; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2308 | |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 2309 | ram_counters.postcopy_requests++; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2310 | rcu_read_lock(); |
| 2311 | if (!rbname) { |
| 2312 | /* Reuse last RAMBlock */ |
Juan Quintela | 68a098f | 2017-03-14 13:48:42 +0100 | [diff] [blame] | 2313 | ramblock = rs->last_req_rb; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2314 | |
| 2315 | if (!ramblock) { |
| 2316 | /* |
| 2317 | * Shouldn't happen, we can't reuse the last RAMBlock if |
| 2318 | * it's the 1st request. |
| 2319 | */ |
| 2320 | error_report("ram_save_queue_pages no previous block"); |
| 2321 | goto err; |
| 2322 | } |
| 2323 | } else { |
| 2324 | ramblock = qemu_ram_block_by_name(rbname); |
| 2325 | |
| 2326 | if (!ramblock) { |
| 2327 | /* We shouldn't be asked for a non-existent RAMBlock */ |
| 2328 | error_report("ram_save_queue_pages no block '%s'", rbname); |
| 2329 | goto err; |
| 2330 | } |
Juan Quintela | 68a098f | 2017-03-14 13:48:42 +0100 | [diff] [blame] | 2331 | rs->last_req_rb = ramblock; |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2332 | } |
| 2333 | trace_ram_save_queue_pages(ramblock->idstr, start, len); |
| 2334 | if (start+len > ramblock->used_length) { |
Juan Quintela | 9458ad6 | 2015-11-10 17:42:05 +0100 | [diff] [blame] | 2335 | error_report("%s request overrun start=" RAM_ADDR_FMT " len=" |
| 2336 | RAM_ADDR_FMT " blocklen=" RAM_ADDR_FMT, |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2337 | __func__, start, len, ramblock->used_length); |
| 2338 | goto err; |
| 2339 | } |
| 2340 | |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2341 | struct RAMSrcPageRequest *new_entry = |
| 2342 | g_malloc0(sizeof(struct RAMSrcPageRequest)); |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2343 | new_entry->rb = ramblock; |
| 2344 | new_entry->offset = start; |
| 2345 | new_entry->len = len; |
| 2346 | |
| 2347 | memory_region_ref(ramblock->mr); |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2348 | qemu_mutex_lock(&rs->src_page_req_mutex); |
| 2349 | 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] | 2350 | migration_make_urgent_request(); |
Juan Quintela | ec481c6 | 2017-03-20 22:12:40 +0100 | [diff] [blame] | 2351 | qemu_mutex_unlock(&rs->src_page_req_mutex); |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2352 | rcu_read_unlock(); |
| 2353 | |
| 2354 | return 0; |
| 2355 | |
| 2356 | err: |
| 2357 | rcu_read_unlock(); |
| 2358 | return -1; |
| 2359 | } |
| 2360 | |
Xiao Guangrong | d7400a3 | 2018-03-30 15:51:26 +0800 | [diff] [blame] | 2361 | static bool save_page_use_compression(RAMState *rs) |
| 2362 | { |
| 2363 | if (!migrate_use_compression()) { |
| 2364 | return false; |
| 2365 | } |
| 2366 | |
| 2367 | /* |
| 2368 | * If xbzrle is on, stop using the data compression after first |
| 2369 | * round of migration even if compression is enabled. In theory, |
| 2370 | * xbzrle can do better than compression. |
| 2371 | */ |
| 2372 | if (rs->ram_bulk_stage || !migrate_use_xbzrle()) { |
| 2373 | return true; |
| 2374 | } |
| 2375 | |
| 2376 | return false; |
| 2377 | } |
| 2378 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2379 | /* |
| 2380 | * try to compress the page before posting it out, return true if the page |
| 2381 | * has been properly handled by compression, otherwise needs other |
| 2382 | * paths to handle it |
| 2383 | */ |
| 2384 | static bool save_compress_page(RAMState *rs, RAMBlock *block, ram_addr_t offset) |
| 2385 | { |
| 2386 | if (!save_page_use_compression(rs)) { |
| 2387 | return false; |
| 2388 | } |
| 2389 | |
| 2390 | /* |
| 2391 | * When starting the process of a new block, the first page of |
| 2392 | * the block should be sent out before other pages in the same |
| 2393 | * block, and all the pages in last block should have been sent |
| 2394 | * out, keeping this order is important, because the 'cont' flag |
| 2395 | * is used to avoid resending the block name. |
| 2396 | * |
| 2397 | * We post the fist page as normal page as compression will take |
| 2398 | * much CPU resource. |
| 2399 | */ |
| 2400 | if (block != rs->last_sent_block) { |
| 2401 | flush_compressed_data(rs); |
| 2402 | return false; |
| 2403 | } |
| 2404 | |
| 2405 | if (compress_page_with_multi_thread(rs, block, offset) > 0) { |
| 2406 | return true; |
| 2407 | } |
| 2408 | |
Xiao Guangrong | 76e0300 | 2018-09-06 15:01:00 +0800 | [diff] [blame] | 2409 | compression_counters.busy++; |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2410 | return false; |
| 2411 | } |
| 2412 | |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2413 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2414 | * ram_save_target_page: save one target page |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2415 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2416 | * Returns the number of pages written |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2417 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2418 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2419 | * @pss: data about the page we want to send |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2420 | * @last_stage: if we are at the completion stage |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2421 | */ |
Juan Quintela | a0a8aa1 | 2017-03-20 22:29:07 +0100 | [diff] [blame] | 2422 | static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss, |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2423 | bool last_stage) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2424 | { |
Xiao Guangrong | a8ec91f | 2018-03-30 15:51:25 +0800 | [diff] [blame] | 2425 | RAMBlock *block = pss->block; |
| 2426 | ram_addr_t offset = pss->page << TARGET_PAGE_BITS; |
| 2427 | int res; |
| 2428 | |
| 2429 | if (control_save_page(rs, block, offset, &res)) { |
| 2430 | return res; |
| 2431 | } |
| 2432 | |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2433 | if (save_compress_page(rs, block, offset)) { |
| 2434 | return 1; |
Xiao Guangrong | d7400a3 | 2018-03-30 15:51:26 +0800 | [diff] [blame] | 2435 | } |
| 2436 | |
| 2437 | res = save_zero_page(rs, block, offset); |
| 2438 | if (res > 0) { |
| 2439 | /* Must let xbzrle know, otherwise a previous (now 0'd) cached |
| 2440 | * page would be stale |
| 2441 | */ |
| 2442 | if (!save_page_use_compression(rs)) { |
| 2443 | XBZRLE_cache_lock(); |
| 2444 | xbzrle_cache_zero_page(rs, block->offset + offset); |
| 2445 | XBZRLE_cache_unlock(); |
| 2446 | } |
| 2447 | ram_release_pages(block->idstr, offset, res); |
| 2448 | return res; |
| 2449 | } |
| 2450 | |
Xiao Guangrong | da3f56c | 2018-03-30 15:51:28 +0800 | [diff] [blame] | 2451 | /* |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2452 | * do not use multifd for compression as the first page in the new |
| 2453 | * block should be posted out before sending the compressed page |
Xiao Guangrong | da3f56c | 2018-03-30 15:51:28 +0800 | [diff] [blame] | 2454 | */ |
Xiao Guangrong | 5e5fdcf | 2018-08-21 16:10:24 +0800 | [diff] [blame] | 2455 | if (!save_page_use_compression(rs) && migrate_use_multifd()) { |
Juan Quintela | b9ee2f7 | 2016-01-15 11:40:13 +0100 | [diff] [blame] | 2456 | return ram_save_multifd_page(rs, block, offset); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2457 | } |
| 2458 | |
Xiao Guangrong | 1faa566 | 2018-03-30 15:51:24 +0800 | [diff] [blame] | 2459 | return ram_save_page(rs, pss, last_stage); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2460 | } |
| 2461 | |
| 2462 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2463 | * ram_save_host_page: save a whole host page |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2464 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2465 | * Starting at *offset send pages up to the end of the current host |
| 2466 | * page. It's valid for the initial offset to point into the middle of |
| 2467 | * a host page in which case the remainder of the hostpage is sent. |
| 2468 | * Only dirty target pages are sent. Note that the host page size may |
| 2469 | * be a huge page for this block. |
Dr. David Alan Gilbert | 1eb3fc0 | 2017-05-17 17:58:09 +0100 | [diff] [blame] | 2470 | * The saving stops at the boundary of the used_length of the block |
| 2471 | * 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] | 2472 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2473 | * Returns the number of pages written or negative on error |
| 2474 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2475 | * @rs: current RAM state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2476 | * @ms: current migration state |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2477 | * @pss: data about the page we want to send |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2478 | * @last_stage: if we are at the completion stage |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2479 | */ |
Juan Quintela | a0a8aa1 | 2017-03-20 22:29:07 +0100 | [diff] [blame] | 2480 | static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss, |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2481 | bool last_stage) |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2482 | { |
| 2483 | int tmppages, pages = 0; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2484 | size_t pagesize_bits = |
| 2485 | qemu_ram_pagesize(pss->block) >> TARGET_PAGE_BITS; |
Dr. David Alan Gilbert | 4c011c3 | 2017-02-24 18:28:39 +0000 | [diff] [blame] | 2486 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2487 | if (ramblock_is_ignored(pss->block)) { |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 2488 | error_report("block %s should not be migrated !", pss->block->idstr); |
| 2489 | return 0; |
| 2490 | } |
| 2491 | |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2492 | do { |
Xiao Guangrong | 1faa566 | 2018-03-30 15:51:24 +0800 | [diff] [blame] | 2493 | /* Check the pages is dirty and if it is send it */ |
| 2494 | if (!migration_bitmap_clear_dirty(rs, pss->block, pss->page)) { |
| 2495 | pss->page++; |
| 2496 | continue; |
| 2497 | } |
| 2498 | |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2499 | tmppages = ram_save_target_page(rs, pss, last_stage); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2500 | if (tmppages < 0) { |
| 2501 | return tmppages; |
| 2502 | } |
| 2503 | |
| 2504 | pages += tmppages; |
Xiao Guangrong | 1faa566 | 2018-03-30 15:51:24 +0800 | [diff] [blame] | 2505 | if (pss->block->unsentmap) { |
| 2506 | clear_bit(pss->page, pss->block->unsentmap); |
| 2507 | } |
| 2508 | |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2509 | pss->page++; |
Dr. David Alan Gilbert | 1eb3fc0 | 2017-05-17 17:58:09 +0100 | [diff] [blame] | 2510 | } while ((pss->page & (pagesize_bits - 1)) && |
| 2511 | offset_in_ramblock(pss->block, pss->page << TARGET_PAGE_BITS)); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2512 | |
| 2513 | /* The offset we leave with is the last one we looked at */ |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2514 | pss->page--; |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2515 | return pages; |
| 2516 | } |
Dr. David Alan Gilbert | 6c595cd | 2015-11-05 18:11:08 +0000 | [diff] [blame] | 2517 | |
| 2518 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2519 | * 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] | 2520 | * |
| 2521 | * Called within an RCU critical section. |
| 2522 | * |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 2523 | * Returns the number of pages written where zero means no dirty pages, |
| 2524 | * or negative on error |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2525 | * |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2526 | * @rs: current RAM state |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2527 | * @last_stage: if we are at the completion stage |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2528 | * |
| 2529 | * On systems where host-page-size > target-page-size it will send all the |
| 2530 | * pages in a host page that are dirty. |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2531 | */ |
| 2532 | |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 2533 | static int ram_find_and_save_block(RAMState *rs, bool last_stage) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2534 | { |
Dr. David Alan Gilbert | b8fb8cb | 2015-09-23 15:27:10 +0100 | [diff] [blame] | 2535 | PageSearchStatus pss; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2536 | int pages = 0; |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2537 | bool again, found; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2538 | |
Ashijeet Acharya | 0827b9e | 2017-02-08 19:58:45 +0530 | [diff] [blame] | 2539 | /* No dirty page as there is zero RAM */ |
| 2540 | if (!ram_bytes_total()) { |
| 2541 | return pages; |
| 2542 | } |
| 2543 | |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2544 | pss.block = rs->last_seen_block; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2545 | pss.page = rs->last_page; |
Dr. David Alan Gilbert | b8fb8cb | 2015-09-23 15:27:10 +0100 | [diff] [blame] | 2546 | pss.complete_round = false; |
| 2547 | |
| 2548 | if (!pss.block) { |
| 2549 | pss.block = QLIST_FIRST_RCU(&ram_list.blocks); |
| 2550 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2551 | |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2552 | do { |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2553 | again = true; |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2554 | found = get_queued_page(rs, &pss); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2555 | |
| 2556 | if (!found) { |
| 2557 | /* priority queue empty, so just search for something dirty */ |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2558 | found = find_dirty_block(rs, &pss, &again); |
Dr. David Alan Gilbert | a82d593 | 2015-11-05 18:11:09 +0000 | [diff] [blame] | 2559 | } |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2560 | |
| 2561 | if (found) { |
Juan Quintela | f20e286 | 2017-03-21 16:19:05 +0100 | [diff] [blame] | 2562 | pages = ram_save_host_page(rs, &pss, last_stage); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2563 | } |
Dr. David Alan Gilbert | b9e6092 | 2015-09-23 15:27:11 +0100 | [diff] [blame] | 2564 | } while (!pages && again); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2565 | |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2566 | rs->last_seen_block = pss.block; |
Juan Quintela | a935e30 | 2017-03-21 15:36:51 +0100 | [diff] [blame] | 2567 | rs->last_page = pss.page; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2568 | |
| 2569 | return pages; |
| 2570 | } |
| 2571 | |
| 2572 | void acct_update_position(QEMUFile *f, size_t size, bool zero) |
| 2573 | { |
| 2574 | uint64_t pages = size / TARGET_PAGE_SIZE; |
Juan Quintela | f7ccd61 | 2017-03-13 20:30:21 +0100 | [diff] [blame] | 2575 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2576 | if (zero) { |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 2577 | ram_counters.duplicate += pages; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2578 | } else { |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 2579 | ram_counters.normal += pages; |
| 2580 | ram_counters.transferred += size; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2581 | qemu_update_position(f, size); |
| 2582 | } |
| 2583 | } |
| 2584 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2585 | static uint64_t ram_bytes_total_common(bool count_ignored) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2586 | { |
| 2587 | RAMBlock *block; |
| 2588 | uint64_t total = 0; |
| 2589 | |
| 2590 | rcu_read_lock(); |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2591 | if (count_ignored) { |
| 2592 | RAMBLOCK_FOREACH_MIGRATABLE(block) { |
| 2593 | total += block->used_length; |
| 2594 | } |
| 2595 | } else { |
| 2596 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
| 2597 | total += block->used_length; |
| 2598 | } |
Peter Xu | 99e1558 | 2017-05-12 12:17:39 +0800 | [diff] [blame] | 2599 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2600 | rcu_read_unlock(); |
| 2601 | return total; |
| 2602 | } |
| 2603 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2604 | uint64_t ram_bytes_total(void) |
| 2605 | { |
| 2606 | return ram_bytes_total_common(false); |
| 2607 | } |
| 2608 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 2609 | static void xbzrle_load_setup(void) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2610 | { |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 2611 | XBZRLE.decoded_buf = g_malloc(TARGET_PAGE_SIZE); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2612 | } |
| 2613 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 2614 | static void xbzrle_load_cleanup(void) |
| 2615 | { |
| 2616 | g_free(XBZRLE.decoded_buf); |
| 2617 | XBZRLE.decoded_buf = NULL; |
| 2618 | } |
| 2619 | |
Peter Xu | 7d7c96b | 2017-10-19 14:31:58 +0800 | [diff] [blame] | 2620 | static void ram_state_cleanup(RAMState **rsp) |
| 2621 | { |
Dr. David Alan Gilbert | b9ccaf6 | 2018-02-12 16:03:39 +0000 | [diff] [blame] | 2622 | if (*rsp) { |
| 2623 | migration_page_queue_free(*rsp); |
| 2624 | qemu_mutex_destroy(&(*rsp)->bitmap_mutex); |
| 2625 | qemu_mutex_destroy(&(*rsp)->src_page_req_mutex); |
| 2626 | g_free(*rsp); |
| 2627 | *rsp = NULL; |
| 2628 | } |
Peter Xu | 7d7c96b | 2017-10-19 14:31:58 +0800 | [diff] [blame] | 2629 | } |
| 2630 | |
Peter Xu | 84593a0 | 2017-10-19 14:31:59 +0800 | [diff] [blame] | 2631 | static void xbzrle_cleanup(void) |
| 2632 | { |
| 2633 | XBZRLE_cache_lock(); |
| 2634 | if (XBZRLE.cache) { |
| 2635 | cache_fini(XBZRLE.cache); |
| 2636 | g_free(XBZRLE.encoded_buf); |
| 2637 | g_free(XBZRLE.current_buf); |
| 2638 | g_free(XBZRLE.zero_target_page); |
| 2639 | XBZRLE.cache = NULL; |
| 2640 | XBZRLE.encoded_buf = NULL; |
| 2641 | XBZRLE.current_buf = NULL; |
| 2642 | XBZRLE.zero_target_page = NULL; |
| 2643 | } |
| 2644 | XBZRLE_cache_unlock(); |
| 2645 | } |
| 2646 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 2647 | static void ram_save_cleanup(void *opaque) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2648 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 2649 | RAMState **rsp = opaque; |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2650 | RAMBlock *block; |
Juan Quintela | eb859c5 | 2017-03-13 21:51:55 +0100 | [diff] [blame] | 2651 | |
Li Zhijian | 2ff6403 | 2015-07-02 20:18:05 +0800 | [diff] [blame] | 2652 | /* caller have hold iothread lock or is in a bh, so there is |
| 2653 | * no writing race against this migration_bitmap |
| 2654 | */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2655 | memory_global_dirty_log_stop(); |
| 2656 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2657 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2658 | g_free(block->bmap); |
| 2659 | block->bmap = NULL; |
| 2660 | g_free(block->unsentmap); |
| 2661 | block->unsentmap = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2662 | } |
| 2663 | |
Peter Xu | 84593a0 | 2017-10-19 14:31:59 +0800 | [diff] [blame] | 2664 | xbzrle_cleanup(); |
Juan Quintela | f0afa33 | 2017-06-28 11:52:28 +0200 | [diff] [blame] | 2665 | compress_threads_save_cleanup(); |
Peter Xu | 7d7c96b | 2017-10-19 14:31:58 +0800 | [diff] [blame] | 2666 | ram_state_cleanup(rsp); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2667 | } |
| 2668 | |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2669 | static void ram_state_reset(RAMState *rs) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2670 | { |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2671 | rs->last_seen_block = NULL; |
| 2672 | rs->last_sent_block = NULL; |
Juan Quintela | 269ace2 | 2017-03-21 15:23:31 +0100 | [diff] [blame] | 2673 | rs->last_page = 0; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 2674 | rs->last_version = ram_list.version; |
| 2675 | rs->ram_bulk_stage = true; |
Wei Wang | 6eeb63f | 2018-12-11 16:24:52 +0800 | [diff] [blame] | 2676 | rs->fpo_enabled = false; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 2677 | } |
| 2678 | |
| 2679 | #define MAX_WAIT 50 /* ms, half buffered_file limit */ |
| 2680 | |
Dr. David Alan Gilbert | 4f2e425 | 2015-11-05 18:10:38 +0000 | [diff] [blame] | 2681 | /* |
| 2682 | * 'expected' is the value you expect the bitmap mostly to be full |
| 2683 | * of; it won't bother printing lines that are all this value. |
| 2684 | * If 'todump' is null the migration bitmap is dumped. |
| 2685 | */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2686 | void ram_debug_dump_bitmap(unsigned long *todump, bool expected, |
| 2687 | unsigned long pages) |
Dr. David Alan Gilbert | 4f2e425 | 2015-11-05 18:10:38 +0000 | [diff] [blame] | 2688 | { |
Dr. David Alan Gilbert | 4f2e425 | 2015-11-05 18:10:38 +0000 | [diff] [blame] | 2689 | int64_t cur; |
| 2690 | int64_t linelen = 128; |
| 2691 | char linebuf[129]; |
| 2692 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2693 | for (cur = 0; cur < pages; cur += linelen) { |
Dr. David Alan Gilbert | 4f2e425 | 2015-11-05 18:10:38 +0000 | [diff] [blame] | 2694 | int64_t curb; |
| 2695 | bool found = false; |
| 2696 | /* |
| 2697 | * Last line; catch the case where the line length |
| 2698 | * is longer than remaining ram |
| 2699 | */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2700 | if (cur + linelen > pages) { |
| 2701 | linelen = pages - cur; |
Dr. David Alan Gilbert | 4f2e425 | 2015-11-05 18:10:38 +0000 | [diff] [blame] | 2702 | } |
| 2703 | for (curb = 0; curb < linelen; curb++) { |
| 2704 | bool thisbit = test_bit(cur + curb, todump); |
| 2705 | linebuf[curb] = thisbit ? '1' : '.'; |
| 2706 | found = found || (thisbit != expected); |
| 2707 | } |
| 2708 | if (found) { |
| 2709 | linebuf[curb] = '\0'; |
| 2710 | fprintf(stderr, "0x%08" PRIx64 " : %s\n", cur, linebuf); |
| 2711 | } |
| 2712 | } |
| 2713 | } |
| 2714 | |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2715 | /* **** functions for postcopy ***** */ |
| 2716 | |
Pavel Butsykin | ced1c61 | 2017-02-03 18:23:21 +0300 | [diff] [blame] | 2717 | void ram_postcopy_migrated_memory_release(MigrationState *ms) |
| 2718 | { |
| 2719 | struct RAMBlock *block; |
Pavel Butsykin | ced1c61 | 2017-02-03 18:23:21 +0300 | [diff] [blame] | 2720 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2721 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2722 | unsigned long *bitmap = block->bmap; |
| 2723 | unsigned long range = block->used_length >> TARGET_PAGE_BITS; |
| 2724 | unsigned long run_start = find_next_zero_bit(bitmap, range, 0); |
Pavel Butsykin | ced1c61 | 2017-02-03 18:23:21 +0300 | [diff] [blame] | 2725 | |
| 2726 | while (run_start < range) { |
| 2727 | unsigned long run_end = find_next_bit(bitmap, range, run_start + 1); |
Juan Quintela | aaa2064 | 2017-03-21 11:35:24 +0100 | [diff] [blame] | 2728 | ram_discard_range(block->idstr, run_start << TARGET_PAGE_BITS, |
Pavel Butsykin | ced1c61 | 2017-02-03 18:23:21 +0300 | [diff] [blame] | 2729 | (run_end - run_start) << TARGET_PAGE_BITS); |
| 2730 | run_start = find_next_zero_bit(bitmap, range, run_end + 1); |
| 2731 | } |
| 2732 | } |
| 2733 | } |
| 2734 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2735 | /** |
| 2736 | * postcopy_send_discard_bm_ram: discard a RAMBlock |
| 2737 | * |
| 2738 | * Returns zero on success |
| 2739 | * |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2740 | * Callback from postcopy_each_ram_send_discard for each RAMBlock |
| 2741 | * Note: At this point the 'unsentmap' is the processed bitmap combined |
| 2742 | * with the dirtymap; so a '1' means it's either dirty or unsent. |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2743 | * |
| 2744 | * @ms: current migration state |
| 2745 | * @pds: state for postcopy |
| 2746 | * @start: RAMBlock starting page |
| 2747 | * @length: RAMBlock size |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2748 | */ |
| 2749 | static int postcopy_send_discard_bm_ram(MigrationState *ms, |
| 2750 | PostcopyDiscardState *pds, |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2751 | RAMBlock *block) |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2752 | { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2753 | unsigned long end = block->used_length >> TARGET_PAGE_BITS; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2754 | unsigned long current; |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2755 | unsigned long *unsentmap = block->unsentmap; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2756 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2757 | for (current = 0; current < end; ) { |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2758 | unsigned long one = find_next_bit(unsentmap, end, current); |
| 2759 | |
| 2760 | if (one <= end) { |
| 2761 | unsigned long zero = find_next_zero_bit(unsentmap, end, one + 1); |
| 2762 | unsigned long discard_length; |
| 2763 | |
| 2764 | if (zero >= end) { |
| 2765 | discard_length = end - one; |
| 2766 | } else { |
| 2767 | discard_length = zero - one; |
| 2768 | } |
Dr. David Alan Gilbert | d688c62 | 2016-06-13 12:16:40 +0100 | [diff] [blame] | 2769 | if (discard_length) { |
| 2770 | postcopy_discard_send_range(ms, pds, one, discard_length); |
| 2771 | } |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2772 | current = one + discard_length; |
| 2773 | } else { |
| 2774 | current = one; |
| 2775 | } |
| 2776 | } |
| 2777 | |
| 2778 | return 0; |
| 2779 | } |
| 2780 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2781 | /** |
| 2782 | * postcopy_each_ram_send_discard: discard all RAMBlocks |
| 2783 | * |
| 2784 | * Returns 0 for success or negative for error |
| 2785 | * |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2786 | * Utility for the outgoing postcopy code. |
| 2787 | * Calls postcopy_send_discard_bm_ram for each RAMBlock |
| 2788 | * passing it bitmap indexes and name. |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2789 | * (qemu_ram_foreach_block ends up passing unscaled lengths |
| 2790 | * which would mean postcopy code would have to deal with target page) |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2791 | * |
| 2792 | * @ms: current migration state |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2793 | */ |
| 2794 | static int postcopy_each_ram_send_discard(MigrationState *ms) |
| 2795 | { |
| 2796 | struct RAMBlock *block; |
| 2797 | int ret; |
| 2798 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 2799 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2800 | PostcopyDiscardState *pds = |
| 2801 | postcopy_discard_send_init(ms, block->idstr); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2802 | |
| 2803 | /* |
| 2804 | * Postcopy sends chunks of bitmap over the wire, but it |
| 2805 | * just needs indexes at this point, avoids it having |
| 2806 | * target page specific code. |
| 2807 | */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2808 | ret = postcopy_send_discard_bm_ram(ms, pds, block); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2809 | postcopy_discard_send_finish(ms, pds); |
| 2810 | if (ret) { |
| 2811 | return ret; |
| 2812 | } |
| 2813 | } |
| 2814 | |
| 2815 | return 0; |
| 2816 | } |
| 2817 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2818 | /** |
| 2819 | * postcopy_chunk_hostpages_pass: canocalize bitmap in hostpages |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2820 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2821 | * Helper for postcopy_chunk_hostpages; it's called twice to |
| 2822 | * canonicalize the two bitmaps, that are similar, but one is |
| 2823 | * inverted. |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2824 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2825 | * Postcopy requires that all target pages in a hostpage are dirty or |
| 2826 | * clean, not a mix. This function canonicalizes the bitmaps. |
| 2827 | * |
| 2828 | * @ms: current migration state |
| 2829 | * @unsent_pass: if true we need to canonicalize partially unsent host pages |
| 2830 | * otherwise we need to canonicalize partially dirty host pages |
| 2831 | * @block: block that contains the page we want to canonicalize |
| 2832 | * @pds: state for postcopy |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2833 | */ |
| 2834 | static void postcopy_chunk_hostpages_pass(MigrationState *ms, bool unsent_pass, |
| 2835 | RAMBlock *block, |
| 2836 | PostcopyDiscardState *pds) |
| 2837 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 2838 | RAMState *rs = ram_state; |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2839 | unsigned long *bitmap = block->bmap; |
| 2840 | unsigned long *unsentmap = block->unsentmap; |
Dr. David Alan Gilbert | 29c5917 | 2017-02-24 18:28:31 +0000 | [diff] [blame] | 2841 | unsigned int host_ratio = block->page_size / TARGET_PAGE_SIZE; |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2842 | unsigned long pages = block->used_length >> TARGET_PAGE_BITS; |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2843 | unsigned long run_start; |
| 2844 | |
Dr. David Alan Gilbert | 29c5917 | 2017-02-24 18:28:31 +0000 | [diff] [blame] | 2845 | if (block->page_size == TARGET_PAGE_SIZE) { |
| 2846 | /* Easy case - TPS==HPS for a non-huge page RAMBlock */ |
| 2847 | return; |
| 2848 | } |
| 2849 | |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2850 | if (unsent_pass) { |
| 2851 | /* Find a sent page */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2852 | run_start = find_next_zero_bit(unsentmap, pages, 0); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2853 | } else { |
| 2854 | /* Find a dirty page */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2855 | run_start = find_next_bit(bitmap, pages, 0); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2856 | } |
| 2857 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2858 | while (run_start < pages) { |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2859 | bool do_fixup = false; |
| 2860 | unsigned long fixup_start_addr; |
| 2861 | unsigned long host_offset; |
| 2862 | |
| 2863 | /* |
| 2864 | * If the start of this run of pages is in the middle of a host |
| 2865 | * page, then we need to fixup this host page. |
| 2866 | */ |
| 2867 | host_offset = run_start % host_ratio; |
| 2868 | if (host_offset) { |
| 2869 | do_fixup = true; |
| 2870 | run_start -= host_offset; |
| 2871 | fixup_start_addr = run_start; |
| 2872 | /* For the next pass */ |
| 2873 | run_start = run_start + host_ratio; |
| 2874 | } else { |
| 2875 | /* Find the end of this run */ |
| 2876 | unsigned long run_end; |
| 2877 | if (unsent_pass) { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2878 | run_end = find_next_bit(unsentmap, pages, run_start + 1); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2879 | } else { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2880 | run_end = find_next_zero_bit(bitmap, pages, run_start + 1); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2881 | } |
| 2882 | /* |
| 2883 | * If the end isn't at the start of a host page, then the |
| 2884 | * run doesn't finish at the end of a host page |
| 2885 | * and we need to discard. |
| 2886 | */ |
| 2887 | host_offset = run_end % host_ratio; |
| 2888 | if (host_offset) { |
| 2889 | do_fixup = true; |
| 2890 | fixup_start_addr = run_end - host_offset; |
| 2891 | /* |
| 2892 | * This host page has gone, the next loop iteration starts |
| 2893 | * from after the fixup |
| 2894 | */ |
| 2895 | run_start = fixup_start_addr + host_ratio; |
| 2896 | } else { |
| 2897 | /* |
| 2898 | * No discards on this iteration, next loop starts from |
| 2899 | * next sent/dirty page |
| 2900 | */ |
| 2901 | run_start = run_end + 1; |
| 2902 | } |
| 2903 | } |
| 2904 | |
| 2905 | if (do_fixup) { |
| 2906 | unsigned long page; |
| 2907 | |
| 2908 | /* Tell the destination to discard this page */ |
| 2909 | if (unsent_pass || !test_bit(fixup_start_addr, unsentmap)) { |
| 2910 | /* For the unsent_pass we: |
| 2911 | * discard partially sent pages |
| 2912 | * For the !unsent_pass (dirty) we: |
| 2913 | * discard partially dirty pages that were sent |
| 2914 | * (any partially sent pages were already discarded |
| 2915 | * by the previous unsent_pass) |
| 2916 | */ |
| 2917 | postcopy_discard_send_range(ms, pds, fixup_start_addr, |
| 2918 | host_ratio); |
| 2919 | } |
| 2920 | |
| 2921 | /* Clean up the bitmap */ |
| 2922 | for (page = fixup_start_addr; |
| 2923 | page < fixup_start_addr + host_ratio; page++) { |
| 2924 | /* All pages in this host page are now not sent */ |
| 2925 | set_bit(page, unsentmap); |
| 2926 | |
| 2927 | /* |
| 2928 | * Remark them as dirty, updating the count for any pages |
| 2929 | * that weren't previously dirty. |
| 2930 | */ |
Juan Quintela | 0d8ec88 | 2017-03-13 21:21:41 +0100 | [diff] [blame] | 2931 | rs->migration_dirty_pages += !test_and_set_bit(page, bitmap); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2932 | } |
| 2933 | } |
| 2934 | |
| 2935 | if (unsent_pass) { |
| 2936 | /* Find the next sent page for the next iteration */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2937 | run_start = find_next_zero_bit(unsentmap, pages, run_start); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2938 | } else { |
| 2939 | /* Find the next dirty page for the next iteration */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2940 | run_start = find_next_bit(bitmap, pages, run_start); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2941 | } |
| 2942 | } |
| 2943 | } |
| 2944 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2945 | /** |
| 2946 | * postcopy_chuck_hostpages: discrad any partially sent host page |
| 2947 | * |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2948 | * Utility for the outgoing postcopy code. |
| 2949 | * |
| 2950 | * 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] | 2951 | * dirty host-page size chunks as all dirty. In this case the host-page |
| 2952 | * 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] | 2953 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2954 | * Returns zero on success |
| 2955 | * |
| 2956 | * @ms: current migration state |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2957 | * @block: block we want to work with |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2958 | */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2959 | static int postcopy_chunk_hostpages(MigrationState *ms, RAMBlock *block) |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2960 | { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2961 | PostcopyDiscardState *pds = |
| 2962 | postcopy_discard_send_init(ms, block->idstr); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2963 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2964 | /* First pass: Discard all partially sent host pages */ |
| 2965 | postcopy_chunk_hostpages_pass(ms, true, block, pds); |
| 2966 | /* |
| 2967 | * Second pass: Ensure that all partially dirty host pages are made |
| 2968 | * fully dirty. |
| 2969 | */ |
| 2970 | postcopy_chunk_hostpages_pass(ms, false, block, pds); |
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 | postcopy_discard_send_finish(ms, pds); |
Dr. David Alan Gilbert | 99e314e | 2015-11-05 18:11:15 +0000 | [diff] [blame] | 2973 | return 0; |
| 2974 | } |
| 2975 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2976 | /** |
| 2977 | * ram_postcopy_send_discard_bitmap: transmit the discard bitmap |
| 2978 | * |
| 2979 | * Returns zero on success |
| 2980 | * |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2981 | * Transmit the set of pages to be discarded after precopy to the target |
| 2982 | * these are pages that: |
| 2983 | * a) Have been previously transmitted but are now dirty again |
| 2984 | * b) Pages that have never been transmitted, this ensures that |
| 2985 | * any pages on the destination that have been mapped by background |
| 2986 | * tasks get discarded (transparent huge pages is the specific concern) |
| 2987 | * Hopefully this is pretty sparse |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 2988 | * |
| 2989 | * @ms: current migration state |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2990 | */ |
| 2991 | int ram_postcopy_send_discard_bitmap(MigrationState *ms) |
| 2992 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 2993 | RAMState *rs = ram_state; |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 2994 | RAMBlock *block; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2995 | int ret; |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 2996 | |
| 2997 | rcu_read_lock(); |
| 2998 | |
| 2999 | /* This should be our last sync, the src is now paused */ |
Juan Quintela | eb859c5 | 2017-03-13 21:51:55 +0100 | [diff] [blame] | 3000 | migration_bitmap_sync(rs); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3001 | |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3002 | /* Easiest way to make sure we don't resume in the middle of a host-page */ |
| 3003 | rs->last_seen_block = NULL; |
| 3004 | rs->last_sent_block = NULL; |
| 3005 | rs->last_page = 0; |
| 3006 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3007 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3008 | unsigned long pages = block->used_length >> TARGET_PAGE_BITS; |
| 3009 | unsigned long *bitmap = block->bmap; |
| 3010 | unsigned long *unsentmap = block->unsentmap; |
| 3011 | |
| 3012 | if (!unsentmap) { |
| 3013 | /* We don't have a safe way to resize the sentmap, so |
| 3014 | * if the bitmap was resized it will be NULL at this |
| 3015 | * point. |
| 3016 | */ |
| 3017 | error_report("migration ram resized during precopy phase"); |
| 3018 | rcu_read_unlock(); |
| 3019 | return -EINVAL; |
| 3020 | } |
| 3021 | /* Deal with TPS != HPS and huge pages */ |
| 3022 | ret = postcopy_chunk_hostpages(ms, block); |
| 3023 | if (ret) { |
| 3024 | rcu_read_unlock(); |
| 3025 | return ret; |
| 3026 | } |
| 3027 | |
| 3028 | /* |
| 3029 | * Update the unsentmap to be unsentmap = unsentmap | dirty |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3030 | */ |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3031 | bitmap_or(unsentmap, unsentmap, bitmap, pages); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3032 | #ifdef DEBUG_POSTCOPY |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3033 | ram_debug_dump_bitmap(unsentmap, true, pages); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3034 | #endif |
Juan Quintela | 6b6712e | 2017-03-22 15:18:04 +0100 | [diff] [blame] | 3035 | } |
| 3036 | trace_ram_postcopy_send_discard_bitmap(); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3037 | |
| 3038 | ret = postcopy_each_ram_send_discard(ms); |
| 3039 | rcu_read_unlock(); |
| 3040 | |
| 3041 | return ret; |
| 3042 | } |
| 3043 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3044 | /** |
| 3045 | * 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] | 3046 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3047 | * Returns zero on success |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3048 | * |
Juan Quintela | 3644915 | 2017-03-23 15:11:59 +0100 | [diff] [blame] | 3049 | * @rbname: name of the RAMBlock of the request. NULL means the |
| 3050 | * same that last one. |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3051 | * @start: RAMBlock starting page |
| 3052 | * @length: RAMBlock size |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3053 | */ |
Juan Quintela | aaa2064 | 2017-03-21 11:35:24 +0100 | [diff] [blame] | 3054 | 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] | 3055 | { |
| 3056 | int ret = -1; |
| 3057 | |
Juan Quintela | 3644915 | 2017-03-23 15:11:59 +0100 | [diff] [blame] | 3058 | trace_ram_discard_range(rbname, start, length); |
Dr. David Alan Gilbert | d3a5038 | 2017-02-24 18:28:32 +0000 | [diff] [blame] | 3059 | |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3060 | rcu_read_lock(); |
Juan Quintela | 3644915 | 2017-03-23 15:11:59 +0100 | [diff] [blame] | 3061 | RAMBlock *rb = qemu_ram_block_by_name(rbname); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3062 | |
| 3063 | if (!rb) { |
Juan Quintela | 3644915 | 2017-03-23 15:11:59 +0100 | [diff] [blame] | 3064 | error_report("ram_discard_range: Failed to find block '%s'", rbname); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3065 | goto err; |
| 3066 | } |
| 3067 | |
Peter Xu | 814bb08 | 2018-07-23 20:33:02 +0800 | [diff] [blame] | 3068 | /* |
| 3069 | * On source VM, we don't need to update the received bitmap since |
| 3070 | * we don't even have one. |
| 3071 | */ |
| 3072 | if (rb->receivedmap) { |
| 3073 | bitmap_clear(rb->receivedmap, start >> qemu_target_page_bits(), |
| 3074 | length >> qemu_target_page_bits()); |
| 3075 | } |
| 3076 | |
Dr. David Alan Gilbert | d3a5038 | 2017-02-24 18:28:32 +0000 | [diff] [blame] | 3077 | ret = ram_block_discard_range(rb, start, length); |
Dr. David Alan Gilbert | e0b266f | 2015-11-05 18:11:02 +0000 | [diff] [blame] | 3078 | |
| 3079 | err: |
| 3080 | rcu_read_unlock(); |
| 3081 | |
| 3082 | return ret; |
| 3083 | } |
| 3084 | |
Peter Xu | 84593a0 | 2017-10-19 14:31:59 +0800 | [diff] [blame] | 3085 | /* |
| 3086 | * For every allocation, we will try not to crash the VM if the |
| 3087 | * allocation failed. |
| 3088 | */ |
| 3089 | static int xbzrle_init(void) |
| 3090 | { |
| 3091 | Error *local_err = NULL; |
| 3092 | |
| 3093 | if (!migrate_use_xbzrle()) { |
| 3094 | return 0; |
| 3095 | } |
| 3096 | |
| 3097 | XBZRLE_cache_lock(); |
| 3098 | |
| 3099 | XBZRLE.zero_target_page = g_try_malloc0(TARGET_PAGE_SIZE); |
| 3100 | if (!XBZRLE.zero_target_page) { |
| 3101 | error_report("%s: Error allocating zero page", __func__); |
| 3102 | goto err_out; |
| 3103 | } |
| 3104 | |
| 3105 | XBZRLE.cache = cache_init(migrate_xbzrle_cache_size(), |
| 3106 | TARGET_PAGE_SIZE, &local_err); |
| 3107 | if (!XBZRLE.cache) { |
| 3108 | error_report_err(local_err); |
| 3109 | goto free_zero_page; |
| 3110 | } |
| 3111 | |
| 3112 | XBZRLE.encoded_buf = g_try_malloc0(TARGET_PAGE_SIZE); |
| 3113 | if (!XBZRLE.encoded_buf) { |
| 3114 | error_report("%s: Error allocating encoded_buf", __func__); |
| 3115 | goto free_cache; |
| 3116 | } |
| 3117 | |
| 3118 | XBZRLE.current_buf = g_try_malloc(TARGET_PAGE_SIZE); |
| 3119 | if (!XBZRLE.current_buf) { |
| 3120 | error_report("%s: Error allocating current_buf", __func__); |
| 3121 | goto free_encoded_buf; |
| 3122 | } |
| 3123 | |
| 3124 | /* We are all good */ |
| 3125 | XBZRLE_cache_unlock(); |
| 3126 | return 0; |
| 3127 | |
| 3128 | free_encoded_buf: |
| 3129 | g_free(XBZRLE.encoded_buf); |
| 3130 | XBZRLE.encoded_buf = NULL; |
| 3131 | free_cache: |
| 3132 | cache_fini(XBZRLE.cache); |
| 3133 | XBZRLE.cache = NULL; |
| 3134 | free_zero_page: |
| 3135 | g_free(XBZRLE.zero_target_page); |
| 3136 | XBZRLE.zero_target_page = NULL; |
| 3137 | err_out: |
| 3138 | XBZRLE_cache_unlock(); |
| 3139 | return -ENOMEM; |
| 3140 | } |
| 3141 | |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3142 | static int ram_state_init(RAMState **rsp) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3143 | { |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3144 | *rsp = g_try_new0(RAMState, 1); |
| 3145 | |
| 3146 | if (!*rsp) { |
| 3147 | error_report("%s: Init ramstate fail", __func__); |
| 3148 | return -1; |
| 3149 | } |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3150 | |
| 3151 | qemu_mutex_init(&(*rsp)->bitmap_mutex); |
| 3152 | qemu_mutex_init(&(*rsp)->src_page_req_mutex); |
| 3153 | QSIMPLEQ_INIT(&(*rsp)->src_page_requests); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3154 | |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3155 | /* |
| 3156 | * Count the total number of pages used by ram blocks not including any |
| 3157 | * gaps due to alignment or unplugs. |
| 3158 | */ |
| 3159 | (*rsp)->migration_dirty_pages = ram_bytes_total() >> TARGET_PAGE_BITS; |
| 3160 | |
| 3161 | ram_state_reset(*rsp); |
| 3162 | |
| 3163 | return 0; |
| 3164 | } |
| 3165 | |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3166 | static void ram_list_init_bitmaps(void) |
| 3167 | { |
| 3168 | RAMBlock *block; |
| 3169 | unsigned long pages; |
| 3170 | |
| 3171 | /* Skip setting bitmap if there is no RAM */ |
| 3172 | if (ram_bytes_total()) { |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3173 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3174 | pages = block->max_length >> TARGET_PAGE_BITS; |
| 3175 | block->bmap = bitmap_new(pages); |
| 3176 | bitmap_set(block->bmap, 0, pages); |
| 3177 | if (migrate_postcopy_ram()) { |
| 3178 | block->unsentmap = bitmap_new(pages); |
| 3179 | bitmap_set(block->unsentmap, 0, pages); |
| 3180 | } |
| 3181 | } |
| 3182 | } |
| 3183 | } |
| 3184 | |
| 3185 | static void ram_init_bitmaps(RAMState *rs) |
| 3186 | { |
| 3187 | /* For memory_global_dirty_log_start below. */ |
| 3188 | qemu_mutex_lock_iothread(); |
| 3189 | qemu_mutex_lock_ramlist(); |
| 3190 | rcu_read_lock(); |
| 3191 | |
| 3192 | ram_list_init_bitmaps(); |
| 3193 | memory_global_dirty_log_start(); |
Wei Wang | bd22706 | 2018-12-11 16:24:51 +0800 | [diff] [blame] | 3194 | migration_bitmap_sync_precopy(rs); |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3195 | |
| 3196 | rcu_read_unlock(); |
| 3197 | qemu_mutex_unlock_ramlist(); |
| 3198 | qemu_mutex_unlock_iothread(); |
| 3199 | } |
| 3200 | |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3201 | static int ram_init_all(RAMState **rsp) |
| 3202 | { |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3203 | if (ram_state_init(rsp)) { |
| 3204 | return -1; |
| 3205 | } |
| 3206 | |
Peter Xu | 84593a0 | 2017-10-19 14:31:59 +0800 | [diff] [blame] | 3207 | if (xbzrle_init()) { |
| 3208 | ram_state_cleanup(rsp); |
| 3209 | return -1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3210 | } |
| 3211 | |
Peter Xu | d6eff5d | 2017-10-19 14:32:00 +0800 | [diff] [blame] | 3212 | ram_init_bitmaps(*rsp); |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3213 | |
| 3214 | return 0; |
| 3215 | } |
| 3216 | |
Peter Xu | 08614f3 | 2018-05-02 18:47:33 +0800 | [diff] [blame] | 3217 | static void ram_state_resume_prepare(RAMState *rs, QEMUFile *out) |
| 3218 | { |
| 3219 | RAMBlock *block; |
| 3220 | uint64_t pages = 0; |
| 3221 | |
| 3222 | /* |
| 3223 | * Postcopy is not using xbzrle/compression, so no need for that. |
| 3224 | * Also, since source are already halted, we don't need to care |
| 3225 | * about dirty page logging as well. |
| 3226 | */ |
| 3227 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3228 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Peter Xu | 08614f3 | 2018-05-02 18:47:33 +0800 | [diff] [blame] | 3229 | pages += bitmap_count_one(block->bmap, |
| 3230 | block->used_length >> TARGET_PAGE_BITS); |
| 3231 | } |
| 3232 | |
| 3233 | /* This may not be aligned with current bitmaps. Recalculate. */ |
| 3234 | rs->migration_dirty_pages = pages; |
| 3235 | |
| 3236 | rs->last_seen_block = NULL; |
| 3237 | rs->last_sent_block = NULL; |
| 3238 | rs->last_page = 0; |
| 3239 | rs->last_version = ram_list.version; |
| 3240 | /* |
| 3241 | * Disable the bulk stage, otherwise we'll resend the whole RAM no |
| 3242 | * matter what we have sent. |
| 3243 | */ |
| 3244 | rs->ram_bulk_stage = false; |
| 3245 | |
| 3246 | /* Update RAMState cache of output QEMUFile */ |
| 3247 | rs->f = out; |
| 3248 | |
| 3249 | trace_ram_state_resume_prepare(pages); |
| 3250 | } |
| 3251 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3252 | /* |
Wei Wang | 6bcb05f | 2018-12-11 16:24:50 +0800 | [diff] [blame] | 3253 | * This function clears bits of the free pages reported by the caller from the |
| 3254 | * migration dirty bitmap. @addr is the host address corresponding to the |
| 3255 | * start of the continuous guest free pages, and @len is the total bytes of |
| 3256 | * those pages. |
| 3257 | */ |
| 3258 | void qemu_guest_free_page_hint(void *addr, size_t len) |
| 3259 | { |
| 3260 | RAMBlock *block; |
| 3261 | ram_addr_t offset; |
| 3262 | size_t used_len, start, npages; |
| 3263 | MigrationState *s = migrate_get_current(); |
| 3264 | |
| 3265 | /* This function is currently expected to be used during live migration */ |
| 3266 | if (!migration_is_setup_or_active(s->state)) { |
| 3267 | return; |
| 3268 | } |
| 3269 | |
| 3270 | for (; len > 0; len -= used_len, addr += used_len) { |
| 3271 | block = qemu_ram_block_from_host(addr, false, &offset); |
| 3272 | if (unlikely(!block || offset >= block->used_length)) { |
| 3273 | /* |
| 3274 | * The implementation might not support RAMBlock resize during |
| 3275 | * live migration, but it could happen in theory with future |
| 3276 | * updates. So we add a check here to capture that case. |
| 3277 | */ |
| 3278 | error_report_once("%s unexpected error", __func__); |
| 3279 | return; |
| 3280 | } |
| 3281 | |
| 3282 | if (len <= block->used_length - offset) { |
| 3283 | used_len = len; |
| 3284 | } else { |
| 3285 | used_len = block->used_length - offset; |
| 3286 | } |
| 3287 | |
| 3288 | start = offset >> TARGET_PAGE_BITS; |
| 3289 | npages = used_len >> TARGET_PAGE_BITS; |
| 3290 | |
| 3291 | qemu_mutex_lock(&ram_state->bitmap_mutex); |
| 3292 | ram_state->migration_dirty_pages -= |
| 3293 | bitmap_count_one_with_offset(block->bmap, start, npages); |
| 3294 | bitmap_clear(block->bmap, start, npages); |
| 3295 | qemu_mutex_unlock(&ram_state->bitmap_mutex); |
| 3296 | } |
| 3297 | } |
| 3298 | |
| 3299 | /* |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3300 | * Each of ram_save_setup, ram_save_iterate and ram_save_complete has |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3301 | * long-running RCU critical section. When rcu-reclaims in the code |
| 3302 | * start to become numerous it will be necessary to reduce the |
| 3303 | * granularity of these critical sections. |
| 3304 | */ |
| 3305 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3306 | /** |
| 3307 | * ram_save_setup: Setup RAM for migration |
| 3308 | * |
| 3309 | * Returns zero to indicate success and negative for error |
| 3310 | * |
| 3311 | * @f: QEMUFile where to send the data |
| 3312 | * @opaque: RAMState pointer |
| 3313 | */ |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3314 | static int ram_save_setup(QEMUFile *f, void *opaque) |
| 3315 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3316 | RAMState **rsp = opaque; |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3317 | RAMBlock *block; |
| 3318 | |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 3319 | if (compress_threads_save_setup()) { |
| 3320 | return -1; |
| 3321 | } |
| 3322 | |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3323 | /* migration has already setup the bitmap, reuse it. */ |
| 3324 | if (!migration_in_colo_state()) { |
Peter Xu | 7d00ee6 | 2017-10-19 14:31:57 +0800 | [diff] [blame] | 3325 | if (ram_init_all(rsp) != 0) { |
Xiao Guangrong | dcaf446 | 2018-03-30 15:51:20 +0800 | [diff] [blame] | 3326 | compress_threads_save_cleanup(); |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3327 | return -1; |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3328 | } |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3329 | } |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3330 | (*rsp)->f = f; |
zhanghailiang | a91246c | 2016-10-27 14:42:59 +0800 | [diff] [blame] | 3331 | |
| 3332 | rcu_read_lock(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3333 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3334 | 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] | 3335 | |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 3336 | RAMBLOCK_FOREACH_MIGRATABLE(block) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3337 | qemu_put_byte(f, strlen(block->idstr)); |
| 3338 | qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr)); |
| 3339 | qemu_put_be64(f, block->used_length); |
Dr. David Alan Gilbert | ef08fb3 | 2017-02-24 18:28:30 +0000 | [diff] [blame] | 3340 | if (migrate_postcopy_ram() && block->page_size != qemu_host_page_size) { |
| 3341 | qemu_put_be64(f, block->page_size); |
| 3342 | } |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3343 | if (migrate_ignore_shared()) { |
| 3344 | qemu_put_be64(f, block->mr->addr); |
| 3345 | qemu_put_byte(f, ramblock_is_ignored(block) ? 1 : 0); |
| 3346 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3347 | } |
| 3348 | |
| 3349 | rcu_read_unlock(); |
| 3350 | |
| 3351 | ram_control_before_iterate(f, RAM_CONTROL_SETUP); |
| 3352 | ram_control_after_iterate(f, RAM_CONTROL_SETUP); |
| 3353 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 3354 | multifd_send_sync_main(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3355 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); |
Juan Quintela | 35374cb | 2018-04-18 10:13:21 +0200 | [diff] [blame] | 3356 | qemu_fflush(f); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3357 | |
| 3358 | return 0; |
| 3359 | } |
| 3360 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3361 | /** |
| 3362 | * ram_save_iterate: iterative stage 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 | */ |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3369 | static int ram_save_iterate(QEMUFile *f, void *opaque) |
| 3370 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3371 | RAMState **temp = opaque; |
| 3372 | RAMState *rs = *temp; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3373 | int ret; |
| 3374 | int i; |
| 3375 | int64_t t0; |
Thomas Huth | 5c90308 | 2016-11-04 14:10:17 +0100 | [diff] [blame] | 3376 | int done = 0; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3377 | |
Peter Lieven | b255734 | 2018-03-08 12:18:24 +0100 | [diff] [blame] | 3378 | if (blk_mig_bulk_active()) { |
| 3379 | /* Avoid transferring ram during bulk phase of block migration as |
| 3380 | * the bulk phase will usually take a long time and transferring |
| 3381 | * ram updates during that time is pointless. */ |
| 3382 | goto out; |
| 3383 | } |
| 3384 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3385 | rcu_read_lock(); |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 3386 | if (ram_list.version != rs->last_version) { |
| 3387 | ram_state_reset(rs); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3388 | } |
| 3389 | |
| 3390 | /* Read version before ram_list.blocks */ |
| 3391 | smp_rmb(); |
| 3392 | |
| 3393 | ram_control_before_iterate(f, RAM_CONTROL_ROUND); |
| 3394 | |
| 3395 | t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); |
| 3396 | i = 0; |
Dr. David Alan Gilbert | e03a34f | 2018-06-13 11:26:42 +0100 | [diff] [blame] | 3397 | while ((ret = qemu_file_rate_limit(f)) == 0 || |
| 3398 | !QSIMPLEQ_EMPTY(&rs->src_page_requests)) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3399 | int pages; |
| 3400 | |
Dr. David Alan Gilbert | e03a34f | 2018-06-13 11:26:42 +0100 | [diff] [blame] | 3401 | if (qemu_file_get_error(f)) { |
| 3402 | break; |
| 3403 | } |
| 3404 | |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 3405 | pages = ram_find_and_save_block(rs, false); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3406 | /* no more pages to sent */ |
| 3407 | if (pages == 0) { |
Thomas Huth | 5c90308 | 2016-11-04 14:10:17 +0100 | [diff] [blame] | 3408 | done = 1; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3409 | break; |
| 3410 | } |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3411 | |
| 3412 | if (pages < 0) { |
| 3413 | qemu_file_set_error(f, pages); |
| 3414 | break; |
| 3415 | } |
| 3416 | |
Xiao Guangrong | be8b02e | 2018-09-03 17:26:42 +0800 | [diff] [blame] | 3417 | rs->target_page_count += pages; |
Jason J. Herne | 070afca | 2015-09-08 13:12:35 -0400 | [diff] [blame] | 3418 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3419 | /* we want to check in the 1st loop, just in case it was the 1st time |
| 3420 | and we had to sync the dirty bitmap. |
| 3421 | qemu_get_clock_ns() is a bit expensive, so we only check each some |
| 3422 | iterations |
| 3423 | */ |
| 3424 | if ((i & 63) == 0) { |
| 3425 | uint64_t t1 = (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - t0) / 1000000; |
| 3426 | if (t1 > MAX_WAIT) { |
Juan Quintela | 55c4446 | 2017-01-23 22:32:05 +0100 | [diff] [blame] | 3427 | trace_ram_save_iterate_big_wait(t1, i); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3428 | break; |
| 3429 | } |
| 3430 | } |
| 3431 | i++; |
| 3432 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3433 | rcu_read_unlock(); |
| 3434 | |
| 3435 | /* |
| 3436 | * Must occur before EOS (or any QEMUFile operation) |
| 3437 | * because of RDMA protocol. |
| 3438 | */ |
| 3439 | ram_control_after_iterate(f, RAM_CONTROL_ROUND); |
| 3440 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 3441 | multifd_send_sync_main(); |
Peter Lieven | b255734 | 2018-03-08 12:18:24 +0100 | [diff] [blame] | 3442 | out: |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3443 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); |
Juan Quintela | 35374cb | 2018-04-18 10:13:21 +0200 | [diff] [blame] | 3444 | qemu_fflush(f); |
Juan Quintela | 9360447 | 2017-06-06 19:49:03 +0200 | [diff] [blame] | 3445 | ram_counters.transferred += 8; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3446 | |
| 3447 | ret = qemu_file_get_error(f); |
| 3448 | if (ret < 0) { |
| 3449 | return ret; |
| 3450 | } |
| 3451 | |
Thomas Huth | 5c90308 | 2016-11-04 14:10:17 +0100 | [diff] [blame] | 3452 | return done; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3453 | } |
| 3454 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3455 | /** |
| 3456 | * ram_save_complete: function called to send the remaining amount of ram |
| 3457 | * |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3458 | * Returns zero to indicate success or negative on error |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3459 | * |
| 3460 | * Called with iothread lock |
| 3461 | * |
| 3462 | * @f: QEMUFile where to send the data |
| 3463 | * @opaque: RAMState pointer |
| 3464 | */ |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3465 | static int ram_save_complete(QEMUFile *f, void *opaque) |
| 3466 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3467 | RAMState **temp = opaque; |
| 3468 | RAMState *rs = *temp; |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3469 | int ret = 0; |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 3470 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3471 | rcu_read_lock(); |
| 3472 | |
Juan Quintela | 5727309 | 2017-03-20 22:25:28 +0100 | [diff] [blame] | 3473 | if (!migration_in_postcopy()) { |
Wei Wang | bd22706 | 2018-12-11 16:24:51 +0800 | [diff] [blame] | 3474 | migration_bitmap_sync_precopy(rs); |
Dr. David Alan Gilbert | 663e6c1 | 2015-11-05 18:11:13 +0000 | [diff] [blame] | 3475 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3476 | |
| 3477 | ram_control_before_iterate(f, RAM_CONTROL_FINISH); |
| 3478 | |
| 3479 | /* try transferring iterative blocks of memory */ |
| 3480 | |
| 3481 | /* flush all remaining blocks regardless of rate limiting */ |
| 3482 | while (true) { |
| 3483 | int pages; |
| 3484 | |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 3485 | pages = ram_find_and_save_block(rs, !migration_in_colo_state()); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3486 | /* no more blocks to sent */ |
| 3487 | if (pages == 0) { |
| 3488 | break; |
| 3489 | } |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3490 | if (pages < 0) { |
| 3491 | ret = pages; |
| 3492 | break; |
| 3493 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3494 | } |
| 3495 | |
Juan Quintela | ce25d33 | 2017-03-15 11:00:51 +0100 | [diff] [blame] | 3496 | flush_compressed_data(rs); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3497 | ram_control_after_iterate(f, RAM_CONTROL_FINISH); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3498 | |
| 3499 | rcu_read_unlock(); |
Paolo Bonzini | d09a6fd | 2015-07-09 08:47:58 +0200 | [diff] [blame] | 3500 | |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 3501 | multifd_send_sync_main(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3502 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); |
Juan Quintela | 35374cb | 2018-04-18 10:13:21 +0200 | [diff] [blame] | 3503 | qemu_fflush(f); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3504 | |
Xiao Guangrong | e8f3735 | 2018-09-03 17:26:44 +0800 | [diff] [blame] | 3505 | return ret; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3506 | } |
| 3507 | |
Dr. David Alan Gilbert | c31b098 | 2015-11-05 18:10:54 +0000 | [diff] [blame] | 3508 | 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] | 3509 | uint64_t *res_precopy_only, |
| 3510 | uint64_t *res_compatible, |
| 3511 | uint64_t *res_postcopy_only) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3512 | { |
Juan Quintela | 53518d9 | 2017-05-04 11:46:24 +0200 | [diff] [blame] | 3513 | RAMState **temp = opaque; |
| 3514 | RAMState *rs = *temp; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3515 | uint64_t remaining_size; |
| 3516 | |
Juan Quintela | 9edabd4 | 2017-03-14 12:02:16 +0100 | [diff] [blame] | 3517 | remaining_size = rs->migration_dirty_pages * TARGET_PAGE_SIZE; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3518 | |
Juan Quintela | 5727309 | 2017-03-20 22:25:28 +0100 | [diff] [blame] | 3519 | if (!migration_in_postcopy() && |
Dr. David Alan Gilbert | 663e6c1 | 2015-11-05 18:11:13 +0000 | [diff] [blame] | 3520 | remaining_size < max_size) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3521 | qemu_mutex_lock_iothread(); |
| 3522 | rcu_read_lock(); |
Wei Wang | bd22706 | 2018-12-11 16:24:51 +0800 | [diff] [blame] | 3523 | migration_bitmap_sync_precopy(rs); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3524 | rcu_read_unlock(); |
| 3525 | qemu_mutex_unlock_iothread(); |
Juan Quintela | 9edabd4 | 2017-03-14 12:02:16 +0100 | [diff] [blame] | 3526 | remaining_size = rs->migration_dirty_pages * TARGET_PAGE_SIZE; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3527 | } |
Dr. David Alan Gilbert | c31b098 | 2015-11-05 18:10:54 +0000 | [diff] [blame] | 3528 | |
Vladimir Sementsov-Ogievskiy | 86e1167 | 2017-07-10 19:30:15 +0300 | [diff] [blame] | 3529 | if (migrate_postcopy_ram()) { |
| 3530 | /* We can do postcopy, and all the data is postcopiable */ |
Vladimir Sementsov-Ogievskiy | 4799502 | 2018-03-13 15:34:00 -0400 | [diff] [blame] | 3531 | *res_compatible += remaining_size; |
Vladimir Sementsov-Ogievskiy | 86e1167 | 2017-07-10 19:30:15 +0300 | [diff] [blame] | 3532 | } else { |
Vladimir Sementsov-Ogievskiy | 4799502 | 2018-03-13 15:34:00 -0400 | [diff] [blame] | 3533 | *res_precopy_only += remaining_size; |
Vladimir Sementsov-Ogievskiy | 86e1167 | 2017-07-10 19:30:15 +0300 | [diff] [blame] | 3534 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3535 | } |
| 3536 | |
| 3537 | static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host) |
| 3538 | { |
| 3539 | unsigned int xh_len; |
| 3540 | int xh_flags; |
Dr. David Alan Gilbert | 063e760 | 2015-12-16 11:47:37 +0000 | [diff] [blame] | 3541 | uint8_t *loaded_data; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3542 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3543 | /* extract RLE header */ |
| 3544 | xh_flags = qemu_get_byte(f); |
| 3545 | xh_len = qemu_get_be16(f); |
| 3546 | |
| 3547 | if (xh_flags != ENCODING_FLAG_XBZRLE) { |
| 3548 | error_report("Failed to load XBZRLE page - wrong compression!"); |
| 3549 | return -1; |
| 3550 | } |
| 3551 | |
| 3552 | if (xh_len > TARGET_PAGE_SIZE) { |
| 3553 | error_report("Failed to load XBZRLE page - len overflow!"); |
| 3554 | return -1; |
| 3555 | } |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 3556 | loaded_data = XBZRLE.decoded_buf; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3557 | /* load data and decode */ |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 3558 | /* 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] | 3559 | qemu_get_buffer_in_place(f, &loaded_data, xh_len); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3560 | |
| 3561 | /* decode RLE */ |
Dr. David Alan Gilbert | 063e760 | 2015-12-16 11:47:37 +0000 | [diff] [blame] | 3562 | if (xbzrle_decode_buffer(loaded_data, xh_len, host, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3563 | TARGET_PAGE_SIZE) == -1) { |
| 3564 | error_report("Failed to load XBZRLE page - decode error!"); |
| 3565 | return -1; |
| 3566 | } |
| 3567 | |
| 3568 | return 0; |
| 3569 | } |
| 3570 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3571 | /** |
| 3572 | * 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] | 3573 | * |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3574 | * Must be called from within a rcu critical section. |
| 3575 | * |
| 3576 | * Returns a pointer from within the RCU-protected ram_list. |
| 3577 | * |
| 3578 | * @f: QEMUFile where to read the data from |
| 3579 | * @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] | 3580 | */ |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3581 | static inline RAMBlock *ram_block_from_stream(QEMUFile *f, int flags) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3582 | { |
| 3583 | static RAMBlock *block = NULL; |
| 3584 | char id[256]; |
| 3585 | uint8_t len; |
| 3586 | |
| 3587 | if (flags & RAM_SAVE_FLAG_CONTINUE) { |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 3588 | if (!block) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3589 | error_report("Ack, bad migration stream!"); |
| 3590 | return NULL; |
| 3591 | } |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 3592 | return block; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3593 | } |
| 3594 | |
| 3595 | len = qemu_get_byte(f); |
| 3596 | qemu_get_buffer(f, (uint8_t *)id, len); |
| 3597 | id[len] = 0; |
| 3598 | |
Dr. David Alan Gilbert | e3dd749 | 2015-11-05 18:10:33 +0000 | [diff] [blame] | 3599 | block = qemu_ram_block_by_name(id); |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 3600 | if (!block) { |
| 3601 | error_report("Can't find block %s", id); |
| 3602 | return NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3603 | } |
| 3604 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3605 | if (ramblock_is_ignored(block)) { |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 3606 | error_report("block %s should not be migrated !", id); |
| 3607 | return NULL; |
| 3608 | } |
| 3609 | |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 3610 | return block; |
| 3611 | } |
| 3612 | |
| 3613 | static inline void *host_from_ram_block_offset(RAMBlock *block, |
| 3614 | ram_addr_t offset) |
| 3615 | { |
| 3616 | if (!offset_in_ramblock(block, offset)) { |
| 3617 | return NULL; |
| 3618 | } |
| 3619 | |
| 3620 | return block->host + offset; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3621 | } |
| 3622 | |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3623 | static inline void *colo_cache_from_block_offset(RAMBlock *block, |
| 3624 | ram_addr_t offset) |
| 3625 | { |
| 3626 | if (!offset_in_ramblock(block, offset)) { |
| 3627 | return NULL; |
| 3628 | } |
| 3629 | if (!block->colo_cache) { |
| 3630 | error_report("%s: colo_cache is NULL in block :%s", |
| 3631 | __func__, block->idstr); |
| 3632 | return NULL; |
| 3633 | } |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3634 | |
| 3635 | /* |
| 3636 | * During colo checkpoint, we need bitmap of these migrated pages. |
| 3637 | * It help us to decide which pages in ram cache should be flushed |
| 3638 | * into VM's RAM later. |
| 3639 | */ |
| 3640 | if (!test_and_set_bit(offset >> TARGET_PAGE_BITS, block->bmap)) { |
| 3641 | ram_state->migration_dirty_pages++; |
| 3642 | } |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3643 | return block->colo_cache + offset; |
| 3644 | } |
| 3645 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3646 | /** |
| 3647 | * ram_handle_compressed: handle the zero page case |
| 3648 | * |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3649 | * If a page (or a whole RDMA chunk) has been |
| 3650 | * determined to be zero, then zap it. |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3651 | * |
| 3652 | * @host: host address for the zero page |
| 3653 | * @ch: what the page is filled from. We only support zero |
| 3654 | * @size: size of the zero page |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3655 | */ |
| 3656 | void ram_handle_compressed(void *host, uint8_t ch, uint64_t size) |
| 3657 | { |
| 3658 | if (ch != 0 || !is_zero_range(host, size)) { |
| 3659 | memset(host, ch, size); |
| 3660 | } |
| 3661 | } |
| 3662 | |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3663 | /* return the size after decompression, or negative value on error */ |
| 3664 | static int |
| 3665 | qemu_uncompress_data(z_stream *stream, uint8_t *dest, size_t dest_len, |
| 3666 | const uint8_t *source, size_t source_len) |
| 3667 | { |
| 3668 | int err; |
| 3669 | |
| 3670 | err = inflateReset(stream); |
| 3671 | if (err != Z_OK) { |
| 3672 | return -1; |
| 3673 | } |
| 3674 | |
| 3675 | stream->avail_in = source_len; |
| 3676 | stream->next_in = (uint8_t *)source; |
| 3677 | stream->avail_out = dest_len; |
| 3678 | stream->next_out = dest; |
| 3679 | |
| 3680 | err = inflate(stream, Z_NO_FLUSH); |
| 3681 | if (err != Z_STREAM_END) { |
| 3682 | return -1; |
| 3683 | } |
| 3684 | |
| 3685 | return stream->total_out; |
| 3686 | } |
| 3687 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3688 | static void *do_data_decompress(void *opaque) |
| 3689 | { |
| 3690 | DecompressParam *param = opaque; |
| 3691 | unsigned long pagesize; |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3692 | uint8_t *des; |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3693 | int len, ret; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3694 | |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3695 | qemu_mutex_lock(¶m->mutex); |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 3696 | while (!param->quit) { |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3697 | if (param->des) { |
| 3698 | des = param->des; |
| 3699 | len = param->len; |
| 3700 | param->des = 0; |
| 3701 | qemu_mutex_unlock(¶m->mutex); |
| 3702 | |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3703 | pagesize = TARGET_PAGE_SIZE; |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3704 | |
| 3705 | ret = qemu_uncompress_data(¶m->stream, des, pagesize, |
| 3706 | param->compbuf, len); |
Xiao Guangrong | f548222 | 2018-05-03 16:06:11 +0800 | [diff] [blame] | 3707 | if (ret < 0 && migrate_get_current()->decompress_error_check) { |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3708 | error_report("decompress data failed"); |
| 3709 | qemu_file_set_error(decomp_file, ret); |
| 3710 | } |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3711 | |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3712 | qemu_mutex_lock(&decomp_done_lock); |
| 3713 | param->done = true; |
| 3714 | qemu_cond_signal(&decomp_done_cond); |
| 3715 | qemu_mutex_unlock(&decomp_done_lock); |
| 3716 | |
| 3717 | qemu_mutex_lock(¶m->mutex); |
| 3718 | } else { |
| 3719 | qemu_cond_wait(¶m->cond, ¶m->mutex); |
| 3720 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3721 | } |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3722 | qemu_mutex_unlock(¶m->mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3723 | |
| 3724 | return NULL; |
| 3725 | } |
| 3726 | |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3727 | static int wait_for_decompress_done(void) |
Liang Li | 5533b2e | 2016-05-05 15:32:52 +0800 | [diff] [blame] | 3728 | { |
| 3729 | int idx, thread_count; |
| 3730 | |
| 3731 | if (!migrate_use_compression()) { |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3732 | return 0; |
Liang Li | 5533b2e | 2016-05-05 15:32:52 +0800 | [diff] [blame] | 3733 | } |
| 3734 | |
| 3735 | thread_count = migrate_decompress_threads(); |
| 3736 | qemu_mutex_lock(&decomp_done_lock); |
| 3737 | for (idx = 0; idx < thread_count; idx++) { |
| 3738 | while (!decomp_param[idx].done) { |
| 3739 | qemu_cond_wait(&decomp_done_cond, &decomp_done_lock); |
| 3740 | } |
| 3741 | } |
| 3742 | qemu_mutex_unlock(&decomp_done_lock); |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3743 | return qemu_file_get_error(decomp_file); |
Liang Li | 5533b2e | 2016-05-05 15:32:52 +0800 | [diff] [blame] | 3744 | } |
| 3745 | |
Juan Quintela | f0afa33 | 2017-06-28 11:52:28 +0200 | [diff] [blame] | 3746 | static void compress_threads_load_cleanup(void) |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3747 | { |
| 3748 | int i, thread_count; |
| 3749 | |
Juan Quintela | 3416ab5 | 2016-04-20 11:56:01 +0200 | [diff] [blame] | 3750 | if (!migrate_use_compression()) { |
| 3751 | return; |
| 3752 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3753 | thread_count = migrate_decompress_threads(); |
| 3754 | for (i = 0; i < thread_count; i++) { |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3755 | /* |
| 3756 | * we use it as a indicator which shows if the thread is |
| 3757 | * properly init'd or not |
| 3758 | */ |
| 3759 | if (!decomp_param[i].compbuf) { |
| 3760 | break; |
| 3761 | } |
| 3762 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3763 | qemu_mutex_lock(&decomp_param[i].mutex); |
Liang Li | 90e56fb | 2016-05-05 15:32:56 +0800 | [diff] [blame] | 3764 | decomp_param[i].quit = true; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3765 | qemu_cond_signal(&decomp_param[i].cond); |
| 3766 | qemu_mutex_unlock(&decomp_param[i].mutex); |
| 3767 | } |
| 3768 | for (i = 0; i < thread_count; i++) { |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3769 | if (!decomp_param[i].compbuf) { |
| 3770 | break; |
| 3771 | } |
| 3772 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3773 | qemu_thread_join(decompress_threads + i); |
| 3774 | qemu_mutex_destroy(&decomp_param[i].mutex); |
| 3775 | qemu_cond_destroy(&decomp_param[i].cond); |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3776 | inflateEnd(&decomp_param[i].stream); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3777 | g_free(decomp_param[i].compbuf); |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3778 | decomp_param[i].compbuf = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3779 | } |
| 3780 | g_free(decompress_threads); |
| 3781 | g_free(decomp_param); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3782 | decompress_threads = NULL; |
| 3783 | decomp_param = NULL; |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3784 | decomp_file = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3785 | } |
| 3786 | |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3787 | static int compress_threads_load_setup(QEMUFile *f) |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3788 | { |
| 3789 | int i, thread_count; |
| 3790 | |
| 3791 | if (!migrate_use_compression()) { |
| 3792 | return 0; |
| 3793 | } |
| 3794 | |
| 3795 | thread_count = migrate_decompress_threads(); |
| 3796 | decompress_threads = g_new0(QemuThread, thread_count); |
| 3797 | decomp_param = g_new0(DecompressParam, thread_count); |
| 3798 | qemu_mutex_init(&decomp_done_lock); |
| 3799 | qemu_cond_init(&decomp_done_cond); |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3800 | decomp_file = f; |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3801 | for (i = 0; i < thread_count; i++) { |
| 3802 | if (inflateInit(&decomp_param[i].stream) != Z_OK) { |
| 3803 | goto exit; |
| 3804 | } |
| 3805 | |
| 3806 | decomp_param[i].compbuf = g_malloc0(compressBound(TARGET_PAGE_SIZE)); |
| 3807 | qemu_mutex_init(&decomp_param[i].mutex); |
| 3808 | qemu_cond_init(&decomp_param[i].cond); |
| 3809 | decomp_param[i].done = true; |
| 3810 | decomp_param[i].quit = false; |
| 3811 | qemu_thread_create(decompress_threads + i, "decompress", |
| 3812 | do_data_decompress, decomp_param + i, |
| 3813 | QEMU_THREAD_JOINABLE); |
| 3814 | } |
| 3815 | return 0; |
| 3816 | exit: |
| 3817 | compress_threads_load_cleanup(); |
| 3818 | return -1; |
| 3819 | } |
| 3820 | |
Dr. David Alan Gilbert | c1bc662 | 2015-12-16 11:47:38 +0000 | [diff] [blame] | 3821 | static void decompress_data_with_multi_threads(QEMUFile *f, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3822 | void *host, int len) |
| 3823 | { |
| 3824 | int idx, thread_count; |
| 3825 | |
| 3826 | thread_count = migrate_decompress_threads(); |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3827 | qemu_mutex_lock(&decomp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3828 | while (true) { |
| 3829 | for (idx = 0; idx < thread_count; idx++) { |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3830 | if (decomp_param[idx].done) { |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3831 | decomp_param[idx].done = false; |
| 3832 | qemu_mutex_lock(&decomp_param[idx].mutex); |
Dr. David Alan Gilbert | c1bc662 | 2015-12-16 11:47:38 +0000 | [diff] [blame] | 3833 | qemu_get_buffer(f, decomp_param[idx].compbuf, len); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3834 | decomp_param[idx].des = host; |
| 3835 | decomp_param[idx].len = len; |
Liang Li | 33d151f | 2016-05-05 15:32:58 +0800 | [diff] [blame] | 3836 | qemu_cond_signal(&decomp_param[idx].cond); |
| 3837 | qemu_mutex_unlock(&decomp_param[idx].mutex); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3838 | break; |
| 3839 | } |
| 3840 | } |
| 3841 | if (idx < thread_count) { |
| 3842 | break; |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3843 | } else { |
| 3844 | qemu_cond_wait(&decomp_done_cond, &decomp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3845 | } |
| 3846 | } |
Liang Li | 73a8912 | 2016-05-05 15:32:51 +0800 | [diff] [blame] | 3847 | qemu_mutex_unlock(&decomp_done_lock); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 3848 | } |
| 3849 | |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3850 | /* |
| 3851 | * colo cache: this is for secondary VM, we cache the whole |
| 3852 | * memory of the secondary VM, it is need to hold the global lock |
| 3853 | * to call this helper. |
| 3854 | */ |
| 3855 | int colo_init_ram_cache(void) |
| 3856 | { |
| 3857 | RAMBlock *block; |
| 3858 | |
| 3859 | rcu_read_lock(); |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3860 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3861 | block->colo_cache = qemu_anon_ram_alloc(block->used_length, |
| 3862 | NULL, |
| 3863 | false); |
| 3864 | if (!block->colo_cache) { |
| 3865 | error_report("%s: Can't alloc memory for COLO cache of block %s," |
| 3866 | "size 0x" RAM_ADDR_FMT, __func__, block->idstr, |
| 3867 | block->used_length); |
| 3868 | goto out_locked; |
| 3869 | } |
| 3870 | memcpy(block->colo_cache, block->host, block->used_length); |
| 3871 | } |
| 3872 | rcu_read_unlock(); |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3873 | /* |
| 3874 | * Record the dirty pages that sent by PVM, we use this dirty bitmap together |
| 3875 | * with to decide which page in cache should be flushed into SVM's RAM. Here |
| 3876 | * we use the same name 'ram_bitmap' as for migration. |
| 3877 | */ |
| 3878 | if (ram_bytes_total()) { |
| 3879 | RAMBlock *block; |
| 3880 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3881 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3882 | unsigned long pages = block->max_length >> TARGET_PAGE_BITS; |
| 3883 | |
| 3884 | block->bmap = bitmap_new(pages); |
| 3885 | bitmap_set(block->bmap, 0, pages); |
| 3886 | } |
| 3887 | } |
| 3888 | ram_state = g_new0(RAMState, 1); |
| 3889 | ram_state->migration_dirty_pages = 0; |
zhanghailiang | d1955d2 | 2018-09-03 12:38:55 +0800 | [diff] [blame] | 3890 | memory_global_dirty_log_start(); |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3891 | |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3892 | return 0; |
| 3893 | |
| 3894 | out_locked: |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3895 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3896 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3897 | if (block->colo_cache) { |
| 3898 | qemu_anon_ram_free(block->colo_cache, block->used_length); |
| 3899 | block->colo_cache = NULL; |
| 3900 | } |
| 3901 | } |
| 3902 | |
| 3903 | rcu_read_unlock(); |
| 3904 | return -errno; |
| 3905 | } |
| 3906 | |
| 3907 | /* It is need to hold the global lock to call this helper */ |
| 3908 | void colo_release_ram_cache(void) |
| 3909 | { |
| 3910 | RAMBlock *block; |
| 3911 | |
zhanghailiang | d1955d2 | 2018-09-03 12:38:55 +0800 | [diff] [blame] | 3912 | memory_global_dirty_log_stop(); |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3913 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3914 | g_free(block->bmap); |
| 3915 | block->bmap = NULL; |
| 3916 | } |
| 3917 | |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3918 | rcu_read_lock(); |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3919 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3920 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3921 | if (block->colo_cache) { |
| 3922 | qemu_anon_ram_free(block->colo_cache, block->used_length); |
| 3923 | block->colo_cache = NULL; |
| 3924 | } |
| 3925 | } |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3926 | |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3927 | rcu_read_unlock(); |
Zhang Chen | 7d9acaf | 2018-09-03 12:38:49 +0800 | [diff] [blame] | 3928 | g_free(ram_state); |
| 3929 | ram_state = NULL; |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3930 | } |
| 3931 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3932 | /** |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 3933 | * ram_load_setup: Setup RAM for migration incoming side |
| 3934 | * |
| 3935 | * Returns zero to indicate success and negative for error |
| 3936 | * |
| 3937 | * @f: QEMUFile where to receive the data |
| 3938 | * @opaque: RAMState pointer |
| 3939 | */ |
| 3940 | static int ram_load_setup(QEMUFile *f, void *opaque) |
| 3941 | { |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 3942 | if (compress_threads_load_setup(f)) { |
Xiao Guangrong | 797ca15 | 2018-03-30 15:51:21 +0800 | [diff] [blame] | 3943 | return -1; |
| 3944 | } |
| 3945 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 3946 | xbzrle_load_setup(); |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 3947 | ramblock_recv_map_init(); |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3948 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 3949 | return 0; |
| 3950 | } |
| 3951 | |
| 3952 | static int ram_load_cleanup(void *opaque) |
| 3953 | { |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 3954 | RAMBlock *rb; |
Junyan He | 56eb90a | 2018-07-18 15:48:03 +0800 | [diff] [blame] | 3955 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3956 | RAMBLOCK_FOREACH_NOT_IGNORED(rb) { |
Junyan He | 56eb90a | 2018-07-18 15:48:03 +0800 | [diff] [blame] | 3957 | if (ramblock_is_pmem(rb)) { |
| 3958 | pmem_persist(rb->host, rb->used_length); |
| 3959 | } |
| 3960 | } |
| 3961 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 3962 | xbzrle_load_cleanup(); |
Juan Quintela | f0afa33 | 2017-06-28 11:52:28 +0200 | [diff] [blame] | 3963 | compress_threads_load_cleanup(); |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 3964 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 3965 | RAMBLOCK_FOREACH_NOT_IGNORED(rb) { |
Alexey Perevalov | f949461 | 2017-10-05 14:13:20 +0300 | [diff] [blame] | 3966 | g_free(rb->receivedmap); |
| 3967 | rb->receivedmap = NULL; |
| 3968 | } |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 3969 | |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 3970 | return 0; |
| 3971 | } |
| 3972 | |
| 3973 | /** |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3974 | * ram_postcopy_incoming_init: allocate postcopy data structures |
| 3975 | * |
| 3976 | * Returns 0 for success and negative if there was one error |
| 3977 | * |
| 3978 | * @mis: current migration incoming state |
| 3979 | * |
| 3980 | * Allocate data structures etc needed by incoming migration with |
| 3981 | * postcopy-ram. postcopy-ram's similarly names |
| 3982 | * postcopy_ram_incoming_init does the work. |
Dr. David Alan Gilbert | 1caddf8 | 2015-11-05 18:11:03 +0000 | [diff] [blame] | 3983 | */ |
| 3984 | int ram_postcopy_incoming_init(MigrationIncomingState *mis) |
| 3985 | { |
David Hildenbrand | c136180 | 2018-06-20 22:27:36 +0200 | [diff] [blame] | 3986 | return postcopy_ram_incoming_init(mis); |
Dr. David Alan Gilbert | 1caddf8 | 2015-11-05 18:11:03 +0000 | [diff] [blame] | 3987 | } |
| 3988 | |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3989 | /** |
| 3990 | * ram_load_postcopy: load a page in postcopy case |
| 3991 | * |
| 3992 | * Returns 0 for success or -errno in case of error |
| 3993 | * |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 3994 | * Called in postcopy mode by ram_load(). |
| 3995 | * rcu_read_lock is taken prior to this being called. |
Juan Quintela | 3d0684b | 2017-03-23 15:06:39 +0100 | [diff] [blame] | 3996 | * |
| 3997 | * @f: QEMUFile where to send the data |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 3998 | */ |
| 3999 | static int ram_load_postcopy(QEMUFile *f) |
| 4000 | { |
| 4001 | int flags = 0, ret = 0; |
| 4002 | bool place_needed = false; |
Peter Xu | 1aa8367 | 2018-07-10 17:18:53 +0800 | [diff] [blame] | 4003 | bool matches_target_page_size = false; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4004 | MigrationIncomingState *mis = migration_incoming_get_current(); |
| 4005 | /* Temporary page that is later 'placed' */ |
| 4006 | void *postcopy_host_page = postcopy_get_tmp_page(mis); |
Dr. David Alan Gilbert | c53b7dd | 2015-11-05 18:11:12 +0000 | [diff] [blame] | 4007 | void *last_host = NULL; |
Dr. David Alan Gilbert | a3b6ff6 | 2015-11-11 14:02:28 +0000 | [diff] [blame] | 4008 | bool all_zero = false; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4009 | |
| 4010 | while (!ret && !(flags & RAM_SAVE_FLAG_EOS)) { |
| 4011 | ram_addr_t addr; |
| 4012 | void *host = NULL; |
| 4013 | void *page_buffer = NULL; |
| 4014 | void *place_source = NULL; |
Dr. David Alan Gilbert | df9ff5e | 2017-02-24 18:28:35 +0000 | [diff] [blame] | 4015 | RAMBlock *block = NULL; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4016 | uint8_t ch; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4017 | |
| 4018 | addr = qemu_get_be64(f); |
Peter Xu | 7a9ddfb | 2018-02-08 18:31:05 +0800 | [diff] [blame] | 4019 | |
| 4020 | /* |
| 4021 | * If qemu file error, we should stop here, and then "addr" |
| 4022 | * may be invalid |
| 4023 | */ |
| 4024 | ret = qemu_file_get_error(f); |
| 4025 | if (ret) { |
| 4026 | break; |
| 4027 | } |
| 4028 | |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4029 | flags = addr & ~TARGET_PAGE_MASK; |
| 4030 | addr &= TARGET_PAGE_MASK; |
| 4031 | |
| 4032 | trace_ram_load_postcopy_loop((uint64_t)addr, flags); |
| 4033 | place_needed = false; |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 4034 | if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE)) { |
Dr. David Alan Gilbert | df9ff5e | 2017-02-24 18:28:35 +0000 | [diff] [blame] | 4035 | block = ram_block_from_stream(f, flags); |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 4036 | |
| 4037 | host = host_from_ram_block_offset(block, addr); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4038 | if (!host) { |
| 4039 | error_report("Illegal RAM offset " RAM_ADDR_FMT, addr); |
| 4040 | ret = -EINVAL; |
| 4041 | break; |
| 4042 | } |
Peter Xu | 1aa8367 | 2018-07-10 17:18:53 +0800 | [diff] [blame] | 4043 | matches_target_page_size = block->page_size == TARGET_PAGE_SIZE; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4044 | /* |
Dr. David Alan Gilbert | 28abd20 | 2017-02-24 18:28:37 +0000 | [diff] [blame] | 4045 | * Postcopy requires that we place whole host pages atomically; |
| 4046 | * these may be huge pages for RAMBlocks that are backed by |
| 4047 | * hugetlbfs. |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4048 | * To make it atomic, the data is read into a temporary page |
| 4049 | * that's moved into place later. |
| 4050 | * The migration protocol uses, possibly smaller, target-pages |
| 4051 | * however the source ensures it always sends all the components |
| 4052 | * of a host page in order. |
| 4053 | */ |
| 4054 | page_buffer = postcopy_host_page + |
Dr. David Alan Gilbert | 28abd20 | 2017-02-24 18:28:37 +0000 | [diff] [blame] | 4055 | ((uintptr_t)host & (block->page_size - 1)); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4056 | /* If all TP are zero then we can optimise the place */ |
Dr. David Alan Gilbert | 28abd20 | 2017-02-24 18:28:37 +0000 | [diff] [blame] | 4057 | if (!((uintptr_t)host & (block->page_size - 1))) { |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4058 | all_zero = true; |
Dr. David Alan Gilbert | c53b7dd | 2015-11-05 18:11:12 +0000 | [diff] [blame] | 4059 | } else { |
| 4060 | /* not the 1st TP within the HP */ |
| 4061 | if (host != (last_host + TARGET_PAGE_SIZE)) { |
Markus Armbruster | 9af9e0f | 2015-12-18 16:35:19 +0100 | [diff] [blame] | 4062 | error_report("Non-sequential target page %p/%p", |
Dr. David Alan Gilbert | c53b7dd | 2015-11-05 18:11:12 +0000 | [diff] [blame] | 4063 | host, last_host); |
| 4064 | ret = -EINVAL; |
| 4065 | break; |
| 4066 | } |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4067 | } |
| 4068 | |
Dr. David Alan Gilbert | c53b7dd | 2015-11-05 18:11:12 +0000 | [diff] [blame] | 4069 | |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4070 | /* |
| 4071 | * If it's the last part of a host page then we place the host |
| 4072 | * page |
| 4073 | */ |
| 4074 | place_needed = (((uintptr_t)host + TARGET_PAGE_SIZE) & |
Dr. David Alan Gilbert | 28abd20 | 2017-02-24 18:28:37 +0000 | [diff] [blame] | 4075 | (block->page_size - 1)) == 0; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4076 | place_source = postcopy_host_page; |
| 4077 | } |
Dr. David Alan Gilbert | c53b7dd | 2015-11-05 18:11:12 +0000 | [diff] [blame] | 4078 | last_host = host; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4079 | |
| 4080 | switch (flags & ~RAM_SAVE_FLAG_CONTINUE) { |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 4081 | case RAM_SAVE_FLAG_ZERO: |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4082 | ch = qemu_get_byte(f); |
| 4083 | memset(page_buffer, ch, TARGET_PAGE_SIZE); |
| 4084 | if (ch) { |
| 4085 | all_zero = false; |
| 4086 | } |
| 4087 | break; |
| 4088 | |
| 4089 | case RAM_SAVE_FLAG_PAGE: |
| 4090 | all_zero = false; |
Peter Xu | 1aa8367 | 2018-07-10 17:18:53 +0800 | [diff] [blame] | 4091 | if (!matches_target_page_size) { |
| 4092 | /* For huge pages, we always use temporary buffer */ |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4093 | qemu_get_buffer(f, page_buffer, TARGET_PAGE_SIZE); |
| 4094 | } else { |
Peter Xu | 1aa8367 | 2018-07-10 17:18:53 +0800 | [diff] [blame] | 4095 | /* |
| 4096 | * For small pages that matches target page size, we |
| 4097 | * avoid the qemu_file copy. Instead we directly use |
| 4098 | * the buffer of QEMUFile to place the page. Note: we |
| 4099 | * cannot do any QEMUFile operation before using that |
| 4100 | * buffer to make sure the buffer is valid when |
| 4101 | * placing the page. |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4102 | */ |
| 4103 | qemu_get_buffer_in_place(f, (uint8_t **)&place_source, |
| 4104 | TARGET_PAGE_SIZE); |
| 4105 | } |
| 4106 | break; |
| 4107 | case RAM_SAVE_FLAG_EOS: |
| 4108 | /* normal exit */ |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 4109 | multifd_recv_sync_main(); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4110 | break; |
| 4111 | default: |
| 4112 | error_report("Unknown combination of migration flags: %#x" |
| 4113 | " (postcopy mode)", flags); |
| 4114 | ret = -EINVAL; |
Peter Xu | 7a9ddfb | 2018-02-08 18:31:05 +0800 | [diff] [blame] | 4115 | break; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4116 | } |
| 4117 | |
Peter Xu | 7a9ddfb | 2018-02-08 18:31:05 +0800 | [diff] [blame] | 4118 | /* Detect for any possible file errors */ |
| 4119 | if (!ret && qemu_file_get_error(f)) { |
| 4120 | ret = qemu_file_get_error(f); |
| 4121 | } |
| 4122 | |
| 4123 | if (!ret && place_needed) { |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4124 | /* This gets called at the last target page in the host page */ |
Dr. David Alan Gilbert | df9ff5e | 2017-02-24 18:28:35 +0000 | [diff] [blame] | 4125 | void *place_dest = host + TARGET_PAGE_SIZE - block->page_size; |
| 4126 | |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4127 | if (all_zero) { |
Dr. David Alan Gilbert | df9ff5e | 2017-02-24 18:28:35 +0000 | [diff] [blame] | 4128 | ret = postcopy_place_page_zero(mis, place_dest, |
Alexey Perevalov | 8be4620 | 2017-10-05 14:13:18 +0300 | [diff] [blame] | 4129 | block); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4130 | } else { |
Dr. David Alan Gilbert | df9ff5e | 2017-02-24 18:28:35 +0000 | [diff] [blame] | 4131 | ret = postcopy_place_page(mis, place_dest, |
Alexey Perevalov | 8be4620 | 2017-10-05 14:13:18 +0300 | [diff] [blame] | 4132 | place_source, block); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4133 | } |
| 4134 | } |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4135 | } |
| 4136 | |
| 4137 | return ret; |
| 4138 | } |
| 4139 | |
Daniel Henrique Barboza | acab30b | 2017-11-16 20:35:26 -0200 | [diff] [blame] | 4140 | static bool postcopy_is_advised(void) |
| 4141 | { |
| 4142 | PostcopyState ps = postcopy_state_get(); |
| 4143 | return ps >= POSTCOPY_INCOMING_ADVISE && ps < POSTCOPY_INCOMING_END; |
| 4144 | } |
| 4145 | |
| 4146 | static bool postcopy_is_running(void) |
| 4147 | { |
| 4148 | PostcopyState ps = postcopy_state_get(); |
| 4149 | return ps >= POSTCOPY_INCOMING_LISTENING && ps < POSTCOPY_INCOMING_END; |
| 4150 | } |
| 4151 | |
Zhang Chen | e6f4aa1 | 2018-09-03 12:38:50 +0800 | [diff] [blame] | 4152 | /* |
| 4153 | * Flush content of RAM cache into SVM's memory. |
| 4154 | * Only flush the pages that be dirtied by PVM or SVM or both. |
| 4155 | */ |
| 4156 | static void colo_flush_ram_cache(void) |
| 4157 | { |
| 4158 | RAMBlock *block = NULL; |
| 4159 | void *dst_host; |
| 4160 | void *src_host; |
| 4161 | unsigned long offset = 0; |
| 4162 | |
zhanghailiang | d1955d2 | 2018-09-03 12:38:55 +0800 | [diff] [blame] | 4163 | memory_global_dirty_log_sync(); |
| 4164 | rcu_read_lock(); |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 4165 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
zhanghailiang | d1955d2 | 2018-09-03 12:38:55 +0800 | [diff] [blame] | 4166 | migration_bitmap_sync_range(ram_state, block, 0, block->used_length); |
| 4167 | } |
| 4168 | rcu_read_unlock(); |
| 4169 | |
Zhang Chen | e6f4aa1 | 2018-09-03 12:38:50 +0800 | [diff] [blame] | 4170 | trace_colo_flush_ram_cache_begin(ram_state->migration_dirty_pages); |
| 4171 | rcu_read_lock(); |
| 4172 | block = QLIST_FIRST_RCU(&ram_list.blocks); |
| 4173 | |
| 4174 | while (block) { |
| 4175 | offset = migration_bitmap_find_dirty(ram_state, block, offset); |
| 4176 | |
| 4177 | if (offset << TARGET_PAGE_BITS >= block->used_length) { |
| 4178 | offset = 0; |
| 4179 | block = QLIST_NEXT_RCU(block, next); |
| 4180 | } else { |
| 4181 | migration_bitmap_clear_dirty(ram_state, block, offset); |
| 4182 | dst_host = block->host + (offset << TARGET_PAGE_BITS); |
| 4183 | src_host = block->colo_cache + (offset << TARGET_PAGE_BITS); |
| 4184 | memcpy(dst_host, src_host, TARGET_PAGE_SIZE); |
| 4185 | } |
| 4186 | } |
| 4187 | |
| 4188 | rcu_read_unlock(); |
| 4189 | trace_colo_flush_ram_cache_end(); |
| 4190 | } |
| 4191 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4192 | static int ram_load(QEMUFile *f, void *opaque, int version_id) |
| 4193 | { |
Juan Quintela | edc6012 | 2016-11-02 12:40:46 +0100 | [diff] [blame] | 4194 | int flags = 0, ret = 0, invalid_flags = 0; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4195 | static uint64_t seq_iter; |
| 4196 | int len = 0; |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4197 | /* |
| 4198 | * If system is running in postcopy mode, page inserts to host memory must |
| 4199 | * be atomic |
| 4200 | */ |
Daniel Henrique Barboza | acab30b | 2017-11-16 20:35:26 -0200 | [diff] [blame] | 4201 | bool postcopy_running = postcopy_is_running(); |
Dr. David Alan Gilbert | ef08fb3 | 2017-02-24 18:28:30 +0000 | [diff] [blame] | 4202 | /* 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] | 4203 | bool postcopy_advised = postcopy_is_advised(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4204 | |
| 4205 | seq_iter++; |
| 4206 | |
| 4207 | if (version_id != 4) { |
| 4208 | ret = -EINVAL; |
| 4209 | } |
| 4210 | |
Juan Quintela | edc6012 | 2016-11-02 12:40:46 +0100 | [diff] [blame] | 4211 | if (!migrate_use_compression()) { |
| 4212 | invalid_flags |= RAM_SAVE_FLAG_COMPRESS_PAGE; |
| 4213 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4214 | /* This RCU critical section can be very long running. |
| 4215 | * When RCU reclaims in the code start to become numerous, |
| 4216 | * it will be necessary to reduce the granularity of this |
| 4217 | * critical section. |
| 4218 | */ |
| 4219 | rcu_read_lock(); |
Dr. David Alan Gilbert | a718087 | 2015-11-05 18:11:11 +0000 | [diff] [blame] | 4220 | |
| 4221 | if (postcopy_running) { |
| 4222 | ret = ram_load_postcopy(f); |
| 4223 | } |
| 4224 | |
| 4225 | while (!postcopy_running && !ret && !(flags & RAM_SAVE_FLAG_EOS)) { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4226 | ram_addr_t addr, total_ram_bytes; |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4227 | void *host = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4228 | uint8_t ch; |
| 4229 | |
| 4230 | addr = qemu_get_be64(f); |
| 4231 | flags = addr & ~TARGET_PAGE_MASK; |
| 4232 | addr &= TARGET_PAGE_MASK; |
| 4233 | |
Juan Quintela | edc6012 | 2016-11-02 12:40:46 +0100 | [diff] [blame] | 4234 | if (flags & invalid_flags) { |
| 4235 | if (flags & invalid_flags & RAM_SAVE_FLAG_COMPRESS_PAGE) { |
| 4236 | error_report("Received an unexpected compressed page"); |
| 4237 | } |
| 4238 | |
| 4239 | ret = -EINVAL; |
| 4240 | break; |
| 4241 | } |
| 4242 | |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 4243 | if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE | |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4244 | RAM_SAVE_FLAG_COMPRESS_PAGE | RAM_SAVE_FLAG_XBZRLE)) { |
zhanghailiang | 4c4bad4 | 2016-01-15 11:37:41 +0800 | [diff] [blame] | 4245 | RAMBlock *block = ram_block_from_stream(f, flags); |
| 4246 | |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 4247 | /* |
| 4248 | * After going into COLO, we should load the Page into colo_cache. |
| 4249 | */ |
| 4250 | if (migration_incoming_in_colo_state()) { |
| 4251 | host = colo_cache_from_block_offset(block, addr); |
| 4252 | } else { |
| 4253 | host = host_from_ram_block_offset(block, addr); |
| 4254 | } |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4255 | if (!host) { |
| 4256 | error_report("Illegal RAM offset " RAM_ADDR_FMT, addr); |
| 4257 | ret = -EINVAL; |
| 4258 | break; |
| 4259 | } |
Zhang Chen | 13af18f | 2018-09-03 12:38:48 +0800 | [diff] [blame] | 4260 | |
| 4261 | if (!migration_incoming_in_colo_state()) { |
| 4262 | ramblock_recv_bitmap_set(block, host); |
| 4263 | } |
| 4264 | |
Dr. David Alan Gilbert | 1db9d8e | 2017-04-26 19:37:21 +0100 | [diff] [blame] | 4265 | 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] | 4266 | } |
| 4267 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4268 | switch (flags & ~RAM_SAVE_FLAG_CONTINUE) { |
| 4269 | case RAM_SAVE_FLAG_MEM_SIZE: |
| 4270 | /* Synchronize RAM block list */ |
| 4271 | total_ram_bytes = addr; |
| 4272 | while (!ret && total_ram_bytes) { |
| 4273 | RAMBlock *block; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4274 | char id[256]; |
| 4275 | ram_addr_t length; |
| 4276 | |
| 4277 | len = qemu_get_byte(f); |
| 4278 | qemu_get_buffer(f, (uint8_t *)id, len); |
| 4279 | id[len] = 0; |
| 4280 | length = qemu_get_be64(f); |
| 4281 | |
Dr. David Alan Gilbert | e3dd749 | 2015-11-05 18:10:33 +0000 | [diff] [blame] | 4282 | block = qemu_ram_block_by_name(id); |
Cédric Le Goater | b895de5 | 2018-05-14 08:57:00 +0200 | [diff] [blame] | 4283 | if (block && !qemu_ram_is_migratable(block)) { |
| 4284 | error_report("block %s should not be migrated !", id); |
| 4285 | ret = -EINVAL; |
| 4286 | } else if (block) { |
Dr. David Alan Gilbert | e3dd749 | 2015-11-05 18:10:33 +0000 | [diff] [blame] | 4287 | if (length != block->used_length) { |
| 4288 | Error *local_err = NULL; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4289 | |
Gonglei | fa53a0e | 2016-05-10 10:04:59 +0800 | [diff] [blame] | 4290 | ret = qemu_ram_resize(block, length, |
Dr. David Alan Gilbert | e3dd749 | 2015-11-05 18:10:33 +0000 | [diff] [blame] | 4291 | &local_err); |
| 4292 | if (local_err) { |
| 4293 | error_report_err(local_err); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4294 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4295 | } |
Dr. David Alan Gilbert | ef08fb3 | 2017-02-24 18:28:30 +0000 | [diff] [blame] | 4296 | /* For postcopy we need to check hugepage sizes match */ |
| 4297 | if (postcopy_advised && |
| 4298 | block->page_size != qemu_host_page_size) { |
| 4299 | uint64_t remote_page_size = qemu_get_be64(f); |
| 4300 | if (remote_page_size != block->page_size) { |
| 4301 | error_report("Mismatched RAM page size %s " |
| 4302 | "(local) %zd != %" PRId64, |
| 4303 | id, block->page_size, |
| 4304 | remote_page_size); |
| 4305 | ret = -EINVAL; |
| 4306 | } |
| 4307 | } |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 4308 | if (migrate_ignore_shared()) { |
| 4309 | hwaddr addr = qemu_get_be64(f); |
| 4310 | bool ignored = qemu_get_byte(f); |
| 4311 | if (ignored != ramblock_is_ignored(block)) { |
| 4312 | error_report("RAM block %s should %s be migrated", |
| 4313 | id, ignored ? "" : "not"); |
| 4314 | ret = -EINVAL; |
| 4315 | } |
| 4316 | if (ramblock_is_ignored(block) && |
| 4317 | block->mr->addr != addr) { |
| 4318 | error_report("Mismatched GPAs for block %s " |
| 4319 | "%" PRId64 "!= %" PRId64, |
| 4320 | id, (uint64_t)addr, |
| 4321 | (uint64_t)block->mr->addr); |
| 4322 | ret = -EINVAL; |
| 4323 | } |
| 4324 | } |
Dr. David Alan Gilbert | e3dd749 | 2015-11-05 18:10:33 +0000 | [diff] [blame] | 4325 | ram_control_load_hook(f, RAM_CONTROL_BLOCK_REG, |
| 4326 | block->idstr); |
| 4327 | } else { |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4328 | error_report("Unknown ramblock \"%s\", cannot " |
| 4329 | "accept migration", id); |
| 4330 | ret = -EINVAL; |
| 4331 | } |
| 4332 | |
| 4333 | total_ram_bytes -= length; |
| 4334 | } |
| 4335 | break; |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4336 | |
Juan Quintela | bb890ed | 2017-04-28 09:39:55 +0200 | [diff] [blame] | 4337 | case RAM_SAVE_FLAG_ZERO: |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4338 | ch = qemu_get_byte(f); |
| 4339 | ram_handle_compressed(host, ch, TARGET_PAGE_SIZE); |
| 4340 | break; |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4341 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4342 | case RAM_SAVE_FLAG_PAGE: |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4343 | qemu_get_buffer(f, host, TARGET_PAGE_SIZE); |
| 4344 | break; |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4345 | |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4346 | case RAM_SAVE_FLAG_COMPRESS_PAGE: |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4347 | len = qemu_get_be32(f); |
| 4348 | if (len < 0 || len > compressBound(TARGET_PAGE_SIZE)) { |
| 4349 | error_report("Invalid compressed data length: %d", len); |
| 4350 | ret = -EINVAL; |
| 4351 | break; |
| 4352 | } |
Dr. David Alan Gilbert | c1bc662 | 2015-12-16 11:47:38 +0000 | [diff] [blame] | 4353 | decompress_data_with_multi_threads(f, host, len); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4354 | break; |
Dr. David Alan Gilbert | a776aa1 | 2015-11-05 18:10:39 +0000 | [diff] [blame] | 4355 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4356 | case RAM_SAVE_FLAG_XBZRLE: |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4357 | if (load_xbzrle(f, addr, host) < 0) { |
| 4358 | error_report("Failed to decompress XBZRLE page at " |
| 4359 | RAM_ADDR_FMT, addr); |
| 4360 | ret = -EINVAL; |
| 4361 | break; |
| 4362 | } |
| 4363 | break; |
| 4364 | case RAM_SAVE_FLAG_EOS: |
| 4365 | /* normal exit */ |
Juan Quintela | 6df264a | 2018-02-28 09:10:07 +0100 | [diff] [blame] | 4366 | multifd_recv_sync_main(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4367 | break; |
| 4368 | default: |
| 4369 | if (flags & RAM_SAVE_FLAG_HOOK) { |
Dr. David Alan Gilbert | 632e3a5 | 2015-06-11 18:17:23 +0100 | [diff] [blame] | 4370 | ram_control_load_hook(f, RAM_CONTROL_HOOK, NULL); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4371 | } else { |
| 4372 | error_report("Unknown combination of migration flags: %#x", |
| 4373 | flags); |
| 4374 | ret = -EINVAL; |
| 4375 | } |
| 4376 | } |
| 4377 | if (!ret) { |
| 4378 | ret = qemu_file_get_error(f); |
| 4379 | } |
| 4380 | } |
| 4381 | |
Xiao Guangrong | 34ab9e9 | 2018-03-30 15:51:22 +0800 | [diff] [blame] | 4382 | ret |= wait_for_decompress_done(); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4383 | rcu_read_unlock(); |
Juan Quintela | 55c4446 | 2017-01-23 22:32:05 +0100 | [diff] [blame] | 4384 | trace_ram_load_complete(ret, seq_iter); |
Zhang Chen | e6f4aa1 | 2018-09-03 12:38:50 +0800 | [diff] [blame] | 4385 | |
| 4386 | if (!ret && migration_incoming_in_colo_state()) { |
| 4387 | colo_flush_ram_cache(); |
| 4388 | } |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4389 | return ret; |
| 4390 | } |
| 4391 | |
Vladimir Sementsov-Ogievskiy | c646762 | 2017-07-10 19:30:14 +0300 | [diff] [blame] | 4392 | static bool ram_has_postcopy(void *opaque) |
| 4393 | { |
Junyan He | 469dd51 | 2018-07-18 15:48:02 +0800 | [diff] [blame] | 4394 | RAMBlock *rb; |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 4395 | RAMBLOCK_FOREACH_NOT_IGNORED(rb) { |
Junyan He | 469dd51 | 2018-07-18 15:48:02 +0800 | [diff] [blame] | 4396 | if (ramblock_is_pmem(rb)) { |
| 4397 | info_report("Block: %s, host: %p is a nvdimm memory, postcopy" |
| 4398 | "is not supported now!", rb->idstr, rb->host); |
| 4399 | return false; |
| 4400 | } |
| 4401 | } |
| 4402 | |
Vladimir Sementsov-Ogievskiy | c646762 | 2017-07-10 19:30:14 +0300 | [diff] [blame] | 4403 | return migrate_postcopy_ram(); |
| 4404 | } |
| 4405 | |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4406 | /* Sync all the dirty bitmap with destination VM. */ |
| 4407 | static int ram_dirty_bitmap_sync_all(MigrationState *s, RAMState *rs) |
| 4408 | { |
| 4409 | RAMBlock *block; |
| 4410 | QEMUFile *file = s->to_dst_file; |
| 4411 | int ramblock_count = 0; |
| 4412 | |
| 4413 | trace_ram_dirty_bitmap_sync_start(); |
| 4414 | |
Yury Kotov | fbd162e | 2019-02-15 20:45:46 +0300 | [diff] [blame] | 4415 | RAMBLOCK_FOREACH_NOT_IGNORED(block) { |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4416 | qemu_savevm_send_recv_bitmap(file, block->idstr); |
| 4417 | trace_ram_dirty_bitmap_request(block->idstr); |
| 4418 | ramblock_count++; |
| 4419 | } |
| 4420 | |
| 4421 | trace_ram_dirty_bitmap_sync_wait(); |
| 4422 | |
| 4423 | /* Wait until all the ramblocks' dirty bitmap synced */ |
| 4424 | while (ramblock_count--) { |
| 4425 | qemu_sem_wait(&s->rp_state.rp_sem); |
| 4426 | } |
| 4427 | |
| 4428 | trace_ram_dirty_bitmap_sync_complete(); |
| 4429 | |
| 4430 | return 0; |
| 4431 | } |
| 4432 | |
| 4433 | static void ram_dirty_bitmap_reload_notify(MigrationState *s) |
| 4434 | { |
| 4435 | qemu_sem_post(&s->rp_state.rp_sem); |
| 4436 | } |
| 4437 | |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 4438 | /* |
| 4439 | * Read the received bitmap, revert it as the initial dirty bitmap. |
| 4440 | * This is only used when the postcopy migration is paused but wants |
| 4441 | * to resume from a middle point. |
| 4442 | */ |
| 4443 | int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *block) |
| 4444 | { |
| 4445 | int ret = -EINVAL; |
| 4446 | QEMUFile *file = s->rp_state.from_dst_file; |
| 4447 | unsigned long *le_bitmap, nbits = block->used_length >> TARGET_PAGE_BITS; |
Peter Xu | a725ef9 | 2018-07-10 17:18:55 +0800 | [diff] [blame] | 4448 | uint64_t local_size = DIV_ROUND_UP(nbits, 8); |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 4449 | uint64_t size, end_mark; |
| 4450 | |
| 4451 | trace_ram_dirty_bitmap_reload_begin(block->idstr); |
| 4452 | |
| 4453 | if (s->state != MIGRATION_STATUS_POSTCOPY_RECOVER) { |
| 4454 | error_report("%s: incorrect state %s", __func__, |
| 4455 | MigrationStatus_str(s->state)); |
| 4456 | return -EINVAL; |
| 4457 | } |
| 4458 | |
| 4459 | /* |
| 4460 | * Note: see comments in ramblock_recv_bitmap_send() on why we |
| 4461 | * need the endianess convertion, and the paddings. |
| 4462 | */ |
| 4463 | local_size = ROUND_UP(local_size, 8); |
| 4464 | |
| 4465 | /* Add paddings */ |
| 4466 | le_bitmap = bitmap_new(nbits + BITS_PER_LONG); |
| 4467 | |
| 4468 | size = qemu_get_be64(file); |
| 4469 | |
| 4470 | /* The size of the bitmap should match with our ramblock */ |
| 4471 | if (size != local_size) { |
| 4472 | error_report("%s: ramblock '%s' bitmap size mismatch " |
| 4473 | "(0x%"PRIx64" != 0x%"PRIx64")", __func__, |
| 4474 | block->idstr, size, local_size); |
| 4475 | ret = -EINVAL; |
| 4476 | goto out; |
| 4477 | } |
| 4478 | |
| 4479 | size = qemu_get_buffer(file, (uint8_t *)le_bitmap, local_size); |
| 4480 | end_mark = qemu_get_be64(file); |
| 4481 | |
| 4482 | ret = qemu_file_get_error(file); |
| 4483 | if (ret || size != local_size) { |
| 4484 | error_report("%s: read bitmap failed for ramblock '%s': %d" |
| 4485 | " (size 0x%"PRIx64", got: 0x%"PRIx64")", |
| 4486 | __func__, block->idstr, ret, local_size, size); |
| 4487 | ret = -EIO; |
| 4488 | goto out; |
| 4489 | } |
| 4490 | |
| 4491 | if (end_mark != RAMBLOCK_RECV_BITMAP_ENDING) { |
| 4492 | error_report("%s: ramblock '%s' end mark incorrect: 0x%"PRIu64, |
| 4493 | __func__, block->idstr, end_mark); |
| 4494 | ret = -EINVAL; |
| 4495 | goto out; |
| 4496 | } |
| 4497 | |
| 4498 | /* |
| 4499 | * Endianess convertion. We are during postcopy (though paused). |
| 4500 | * The dirty bitmap won't change. We can directly modify it. |
| 4501 | */ |
| 4502 | bitmap_from_le(block->bmap, le_bitmap, nbits); |
| 4503 | |
| 4504 | /* |
| 4505 | * What we received is "received bitmap". Revert it as the initial |
| 4506 | * dirty bitmap for this ramblock. |
| 4507 | */ |
| 4508 | bitmap_complement(block->bmap, block->bmap, nbits); |
| 4509 | |
| 4510 | trace_ram_dirty_bitmap_reload_complete(block->idstr); |
| 4511 | |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4512 | /* |
| 4513 | * We succeeded to sync bitmap for current ramblock. If this is |
| 4514 | * the last one to sync, we need to notify the main send thread. |
| 4515 | */ |
| 4516 | ram_dirty_bitmap_reload_notify(s); |
| 4517 | |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 4518 | ret = 0; |
| 4519 | out: |
Peter Xu | bf26990 | 2018-05-25 09:50:42 +0800 | [diff] [blame] | 4520 | g_free(le_bitmap); |
Peter Xu | a335deb | 2018-05-02 18:47:28 +0800 | [diff] [blame] | 4521 | return ret; |
| 4522 | } |
| 4523 | |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4524 | static int ram_resume_prepare(MigrationState *s, void *opaque) |
| 4525 | { |
| 4526 | RAMState *rs = *(RAMState **)opaque; |
Peter Xu | 08614f3 | 2018-05-02 18:47:33 +0800 | [diff] [blame] | 4527 | int ret; |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4528 | |
Peter Xu | 08614f3 | 2018-05-02 18:47:33 +0800 | [diff] [blame] | 4529 | ret = ram_dirty_bitmap_sync_all(s, rs); |
| 4530 | if (ret) { |
| 4531 | return ret; |
| 4532 | } |
| 4533 | |
| 4534 | ram_state_resume_prepare(rs, s->to_dst_file); |
| 4535 | |
| 4536 | return 0; |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4537 | } |
| 4538 | |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4539 | static SaveVMHandlers savevm_ram_handlers = { |
Juan Quintela | 9907e84 | 2017-06-28 11:52:24 +0200 | [diff] [blame] | 4540 | .save_setup = ram_save_setup, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4541 | .save_live_iterate = ram_save_iterate, |
Dr. David Alan Gilbert | 763c906 | 2015-11-05 18:11:00 +0000 | [diff] [blame] | 4542 | .save_live_complete_postcopy = ram_save_complete, |
Dr. David Alan Gilbert | a3e06c3 | 2015-11-05 18:10:41 +0000 | [diff] [blame] | 4543 | .save_live_complete_precopy = ram_save_complete, |
Vladimir Sementsov-Ogievskiy | c646762 | 2017-07-10 19:30:14 +0300 | [diff] [blame] | 4544 | .has_postcopy = ram_has_postcopy, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4545 | .save_live_pending = ram_save_pending, |
| 4546 | .load_state = ram_load, |
Juan Quintela | f265e0e | 2017-06-28 11:52:27 +0200 | [diff] [blame] | 4547 | .save_cleanup = ram_save_cleanup, |
| 4548 | .load_setup = ram_load_setup, |
| 4549 | .load_cleanup = ram_load_cleanup, |
Peter Xu | edd090c | 2018-05-02 18:47:32 +0800 | [diff] [blame] | 4550 | .resume_prepare = ram_resume_prepare, |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4551 | }; |
| 4552 | |
| 4553 | void ram_mig_init(void) |
| 4554 | { |
| 4555 | qemu_mutex_init(&XBZRLE.lock); |
Juan Quintela | 6f37bb8 | 2017-03-13 19:26:29 +0100 | [diff] [blame] | 4556 | register_savevm_live(NULL, "ram", 0, 4, &savevm_ram_handlers, &ram_state); |
Juan Quintela | 56e93d2 | 2015-05-07 19:33:31 +0200 | [diff] [blame] | 4557 | } |