Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Multifd common code |
| 3 | * |
| 4 | * Copyright (c) 2019-2020 Red Hat Inc |
| 5 | * |
| 6 | * Authors: |
| 7 | * Juan Quintela <quintela@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 10 | * See the COPYING file in the top-level directory. |
| 11 | */ |
| 12 | |
| 13 | #include "qemu/osdep.h" |
| 14 | #include "qemu/rcu.h" |
| 15 | #include "exec/target_page.h" |
| 16 | #include "sysemu/sysemu.h" |
| 17 | #include "exec/ramblock.h" |
| 18 | #include "qemu/error-report.h" |
| 19 | #include "qapi/error.h" |
| 20 | #include "ram.h" |
| 21 | #include "migration.h" |
| 22 | #include "socket.h" |
| 23 | #include "qemu-file.h" |
| 24 | #include "trace.h" |
| 25 | #include "multifd.h" |
| 26 | |
| 27 | /* Multiple fd's */ |
| 28 | |
| 29 | #define MULTIFD_MAGIC 0x11223344U |
| 30 | #define MULTIFD_VERSION 1 |
| 31 | |
| 32 | typedef struct { |
| 33 | uint32_t magic; |
| 34 | uint32_t version; |
| 35 | unsigned char uuid[16]; /* QemuUUID */ |
| 36 | uint8_t id; |
| 37 | uint8_t unused1[7]; /* Reserved for future use */ |
| 38 | uint64_t unused2[4]; /* Reserved for future use */ |
| 39 | } __attribute__((packed)) MultiFDInit_t; |
| 40 | |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 41 | /* Multifd without compression */ |
| 42 | |
| 43 | /** |
| 44 | * nocomp_send_setup: setup send side |
| 45 | * |
| 46 | * For no compression this function does nothing. |
| 47 | * |
| 48 | * Returns 0 for success or -1 for error |
| 49 | * |
| 50 | * @p: Params for the channel that we are using |
| 51 | * @errp: pointer to an error |
| 52 | */ |
| 53 | static int nocomp_send_setup(MultiFDSendParams *p, Error **errp) |
| 54 | { |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * nocomp_send_cleanup: cleanup send side |
| 60 | * |
| 61 | * For no compression this function does nothing. |
| 62 | * |
| 63 | * @p: Params for the channel that we are using |
| 64 | */ |
| 65 | static void nocomp_send_cleanup(MultiFDSendParams *p, Error **errp) |
| 66 | { |
| 67 | return; |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * nocomp_send_prepare: prepare date to be able to send |
| 72 | * |
| 73 | * For no compression we just have to calculate the size of the |
| 74 | * packet. |
| 75 | * |
| 76 | * Returns 0 for success or -1 for error |
| 77 | * |
| 78 | * @p: Params for the channel that we are using |
| 79 | * @used: number of pages used |
| 80 | * @errp: pointer to an error |
| 81 | */ |
| 82 | static int nocomp_send_prepare(MultiFDSendParams *p, uint32_t used, |
| 83 | Error **errp) |
| 84 | { |
| 85 | p->next_packet_size = used * qemu_target_page_size(); |
| 86 | p->flags |= MULTIFD_FLAG_NOCOMP; |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * nocomp_send_write: do the actual write of the data |
| 92 | * |
| 93 | * For no compression we just have to write the data. |
| 94 | * |
| 95 | * Returns 0 for success or -1 for error |
| 96 | * |
| 97 | * @p: Params for the channel that we are using |
| 98 | * @used: number of pages used |
| 99 | * @errp: pointer to an error |
| 100 | */ |
| 101 | static int nocomp_send_write(MultiFDSendParams *p, uint32_t used, Error **errp) |
| 102 | { |
| 103 | return qio_channel_writev_all(p->c, p->pages->iov, used, errp); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * nocomp_recv_setup: setup receive side |
| 108 | * |
| 109 | * For no compression this function does nothing. |
| 110 | * |
| 111 | * Returns 0 for success or -1 for error |
| 112 | * |
| 113 | * @p: Params for the channel that we are using |
| 114 | * @errp: pointer to an error |
| 115 | */ |
| 116 | static int nocomp_recv_setup(MultiFDRecvParams *p, Error **errp) |
| 117 | { |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * nocomp_recv_cleanup: setup receive side |
| 123 | * |
| 124 | * For no compression this function does nothing. |
| 125 | * |
| 126 | * @p: Params for the channel that we are using |
| 127 | */ |
| 128 | static void nocomp_recv_cleanup(MultiFDRecvParams *p) |
| 129 | { |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * nocomp_recv_pages: read the data from the channel into actual pages |
| 134 | * |
| 135 | * For no compression we just need to read things into the correct place. |
| 136 | * |
| 137 | * Returns 0 for success or -1 for error |
| 138 | * |
| 139 | * @p: Params for the channel that we are using |
| 140 | * @used: number of pages used |
| 141 | * @errp: pointer to an error |
| 142 | */ |
| 143 | static int nocomp_recv_pages(MultiFDRecvParams *p, uint32_t used, Error **errp) |
| 144 | { |
| 145 | uint32_t flags = p->flags & MULTIFD_FLAG_COMPRESSION_MASK; |
| 146 | |
| 147 | if (flags != MULTIFD_FLAG_NOCOMP) { |
| 148 | error_setg(errp, "multifd %d: flags received %x flags expected %x", |
| 149 | p->id, flags, MULTIFD_FLAG_NOCOMP); |
| 150 | return -1; |
| 151 | } |
| 152 | return qio_channel_readv_all(p->c, p->pages->iov, used, errp); |
| 153 | } |
| 154 | |
| 155 | static MultiFDMethods multifd_nocomp_ops = { |
| 156 | .send_setup = nocomp_send_setup, |
| 157 | .send_cleanup = nocomp_send_cleanup, |
| 158 | .send_prepare = nocomp_send_prepare, |
| 159 | .send_write = nocomp_send_write, |
| 160 | .recv_setup = nocomp_recv_setup, |
| 161 | .recv_cleanup = nocomp_recv_cleanup, |
| 162 | .recv_pages = nocomp_recv_pages |
| 163 | }; |
| 164 | |
| 165 | static MultiFDMethods *multifd_ops[MULTIFD_COMPRESSION__MAX] = { |
| 166 | [MULTIFD_COMPRESSION_NONE] = &multifd_nocomp_ops, |
| 167 | }; |
| 168 | |
Juan Quintela | 7ec2c2b | 2019-01-04 15:30:06 +0100 | [diff] [blame] | 169 | void multifd_register_ops(int method, MultiFDMethods *ops) |
| 170 | { |
| 171 | assert(0 < method && method < MULTIFD_COMPRESSION__MAX); |
| 172 | multifd_ops[method] = ops; |
| 173 | } |
| 174 | |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 175 | static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp) |
| 176 | { |
| 177 | MultiFDInit_t msg = {}; |
| 178 | int ret; |
| 179 | |
| 180 | msg.magic = cpu_to_be32(MULTIFD_MAGIC); |
| 181 | msg.version = cpu_to_be32(MULTIFD_VERSION); |
| 182 | msg.id = p->id; |
| 183 | memcpy(msg.uuid, &qemu_uuid.data, sizeof(msg.uuid)); |
| 184 | |
| 185 | ret = qio_channel_write_all(p->c, (char *)&msg, sizeof(msg), errp); |
| 186 | if (ret != 0) { |
| 187 | return -1; |
| 188 | } |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | static int multifd_recv_initial_packet(QIOChannel *c, Error **errp) |
| 193 | { |
| 194 | MultiFDInit_t msg; |
| 195 | int ret; |
| 196 | |
| 197 | ret = qio_channel_read_all(c, (char *)&msg, sizeof(msg), errp); |
| 198 | if (ret != 0) { |
| 199 | return -1; |
| 200 | } |
| 201 | |
| 202 | msg.magic = be32_to_cpu(msg.magic); |
| 203 | msg.version = be32_to_cpu(msg.version); |
| 204 | |
| 205 | if (msg.magic != MULTIFD_MAGIC) { |
| 206 | error_setg(errp, "multifd: received packet magic %x " |
| 207 | "expected %x", msg.magic, MULTIFD_MAGIC); |
| 208 | return -1; |
| 209 | } |
| 210 | |
| 211 | if (msg.version != MULTIFD_VERSION) { |
| 212 | error_setg(errp, "multifd: received packet version %d " |
| 213 | "expected %d", msg.version, MULTIFD_VERSION); |
| 214 | return -1; |
| 215 | } |
| 216 | |
| 217 | if (memcmp(msg.uuid, &qemu_uuid, sizeof(qemu_uuid))) { |
| 218 | char *uuid = qemu_uuid_unparse_strdup(&qemu_uuid); |
| 219 | char *msg_uuid = qemu_uuid_unparse_strdup((const QemuUUID *)msg.uuid); |
| 220 | |
| 221 | error_setg(errp, "multifd: received uuid '%s' and expected " |
| 222 | "uuid '%s' for channel %hhd", msg_uuid, uuid, msg.id); |
| 223 | g_free(uuid); |
| 224 | g_free(msg_uuid); |
| 225 | return -1; |
| 226 | } |
| 227 | |
| 228 | if (msg.id > migrate_multifd_channels()) { |
| 229 | error_setg(errp, "multifd: received channel version %d " |
| 230 | "expected %d", msg.version, MULTIFD_VERSION); |
| 231 | return -1; |
| 232 | } |
| 233 | |
| 234 | return msg.id; |
| 235 | } |
| 236 | |
| 237 | static MultiFDPages_t *multifd_pages_init(size_t size) |
| 238 | { |
| 239 | MultiFDPages_t *pages = g_new0(MultiFDPages_t, 1); |
| 240 | |
| 241 | pages->allocated = size; |
| 242 | pages->iov = g_new0(struct iovec, size); |
| 243 | pages->offset = g_new0(ram_addr_t, size); |
| 244 | |
| 245 | return pages; |
| 246 | } |
| 247 | |
| 248 | static void multifd_pages_clear(MultiFDPages_t *pages) |
| 249 | { |
| 250 | pages->used = 0; |
| 251 | pages->allocated = 0; |
| 252 | pages->packet_num = 0; |
| 253 | pages->block = NULL; |
| 254 | g_free(pages->iov); |
| 255 | pages->iov = NULL; |
| 256 | g_free(pages->offset); |
| 257 | pages->offset = NULL; |
| 258 | g_free(pages); |
| 259 | } |
| 260 | |
| 261 | static void multifd_send_fill_packet(MultiFDSendParams *p) |
| 262 | { |
| 263 | MultiFDPacket_t *packet = p->packet; |
| 264 | int i; |
| 265 | |
| 266 | packet->flags = cpu_to_be32(p->flags); |
| 267 | packet->pages_alloc = cpu_to_be32(p->pages->allocated); |
| 268 | packet->pages_used = cpu_to_be32(p->pages->used); |
| 269 | packet->next_packet_size = cpu_to_be32(p->next_packet_size); |
| 270 | packet->packet_num = cpu_to_be64(p->packet_num); |
| 271 | |
| 272 | if (p->pages->block) { |
| 273 | strncpy(packet->ramblock, p->pages->block->idstr, 256); |
| 274 | } |
| 275 | |
| 276 | for (i = 0; i < p->pages->used; i++) { |
| 277 | /* there are architectures where ram_addr_t is 32 bit */ |
| 278 | uint64_t temp = p->pages->offset[i]; |
| 279 | |
| 280 | packet->offset[i] = cpu_to_be64(temp); |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) |
| 285 | { |
| 286 | MultiFDPacket_t *packet = p->packet; |
| 287 | uint32_t pages_max = MULTIFD_PACKET_SIZE / qemu_target_page_size(); |
| 288 | RAMBlock *block; |
| 289 | int i; |
| 290 | |
| 291 | packet->magic = be32_to_cpu(packet->magic); |
| 292 | if (packet->magic != MULTIFD_MAGIC) { |
| 293 | error_setg(errp, "multifd: received packet " |
| 294 | "magic %x and expected magic %x", |
| 295 | packet->magic, MULTIFD_MAGIC); |
| 296 | return -1; |
| 297 | } |
| 298 | |
| 299 | packet->version = be32_to_cpu(packet->version); |
| 300 | if (packet->version != MULTIFD_VERSION) { |
| 301 | error_setg(errp, "multifd: received packet " |
| 302 | "version %d and expected version %d", |
| 303 | packet->version, MULTIFD_VERSION); |
| 304 | return -1; |
| 305 | } |
| 306 | |
| 307 | p->flags = be32_to_cpu(packet->flags); |
| 308 | |
| 309 | packet->pages_alloc = be32_to_cpu(packet->pages_alloc); |
| 310 | /* |
| 311 | * If we received a packet that is 100 times bigger than expected |
| 312 | * just stop migration. It is a magic number. |
| 313 | */ |
| 314 | if (packet->pages_alloc > pages_max * 100) { |
| 315 | error_setg(errp, "multifd: received packet " |
| 316 | "with size %d and expected a maximum size of %d", |
| 317 | packet->pages_alloc, pages_max * 100) ; |
| 318 | return -1; |
| 319 | } |
| 320 | /* |
| 321 | * We received a packet that is bigger than expected but inside |
| 322 | * reasonable limits (see previous comment). Just reallocate. |
| 323 | */ |
| 324 | if (packet->pages_alloc > p->pages->allocated) { |
| 325 | multifd_pages_clear(p->pages); |
| 326 | p->pages = multifd_pages_init(packet->pages_alloc); |
| 327 | } |
| 328 | |
| 329 | p->pages->used = be32_to_cpu(packet->pages_used); |
| 330 | if (p->pages->used > packet->pages_alloc) { |
| 331 | error_setg(errp, "multifd: received packet " |
| 332 | "with %d pages and expected maximum pages are %d", |
| 333 | p->pages->used, packet->pages_alloc) ; |
| 334 | return -1; |
| 335 | } |
| 336 | |
| 337 | p->next_packet_size = be32_to_cpu(packet->next_packet_size); |
| 338 | p->packet_num = be64_to_cpu(packet->packet_num); |
| 339 | |
| 340 | if (p->pages->used == 0) { |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | /* make sure that ramblock is 0 terminated */ |
| 345 | packet->ramblock[255] = 0; |
| 346 | block = qemu_ram_block_by_name(packet->ramblock); |
| 347 | if (!block) { |
| 348 | error_setg(errp, "multifd: unknown ram block %s", |
| 349 | packet->ramblock); |
| 350 | return -1; |
| 351 | } |
| 352 | |
| 353 | for (i = 0; i < p->pages->used; i++) { |
| 354 | uint64_t offset = be64_to_cpu(packet->offset[i]); |
| 355 | |
| 356 | if (offset > (block->used_length - qemu_target_page_size())) { |
| 357 | error_setg(errp, "multifd: offset too long %" PRIu64 |
| 358 | " (max " RAM_ADDR_FMT ")", |
| 359 | offset, block->max_length); |
| 360 | return -1; |
| 361 | } |
| 362 | p->pages->iov[i].iov_base = block->host + offset; |
| 363 | p->pages->iov[i].iov_len = qemu_target_page_size(); |
| 364 | } |
| 365 | |
| 366 | return 0; |
| 367 | } |
| 368 | |
| 369 | struct { |
| 370 | MultiFDSendParams *params; |
| 371 | /* array of pages to sent */ |
| 372 | MultiFDPages_t *pages; |
| 373 | /* global number of generated multifd packets */ |
| 374 | uint64_t packet_num; |
| 375 | /* send channels ready */ |
| 376 | QemuSemaphore channels_ready; |
| 377 | /* |
| 378 | * Have we already run terminate threads. There is a race when it |
| 379 | * happens that we got one error while we are exiting. |
| 380 | * We will use atomic operations. Only valid values are 0 and 1. |
| 381 | */ |
| 382 | int exiting; |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 383 | /* multifd ops */ |
| 384 | MultiFDMethods *ops; |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 385 | } *multifd_send_state; |
| 386 | |
| 387 | /* |
| 388 | * How we use multifd_send_state->pages and channel->pages? |
| 389 | * |
| 390 | * We create a pages for each channel, and a main one. Each time that |
| 391 | * we need to send a batch of pages we interchange the ones between |
| 392 | * multifd_send_state and the channel that is sending it. There are |
| 393 | * two reasons for that: |
| 394 | * - to not have to do so many mallocs during migration |
| 395 | * - to make easier to know what to free at the end of migration |
| 396 | * |
| 397 | * This way we always know who is the owner of each "pages" struct, |
| 398 | * and we don't need any locking. It belongs to the migration thread |
| 399 | * or to the channel thread. Switching is safe because the migration |
| 400 | * thread is using the channel mutex when changing it, and the channel |
| 401 | * have to had finish with its own, otherwise pending_job can't be |
| 402 | * false. |
| 403 | */ |
| 404 | |
| 405 | static int multifd_send_pages(QEMUFile *f) |
| 406 | { |
| 407 | int i; |
| 408 | static int next_channel; |
| 409 | MultiFDSendParams *p = NULL; /* make happy gcc */ |
| 410 | MultiFDPages_t *pages = multifd_send_state->pages; |
| 411 | uint64_t transferred; |
| 412 | |
| 413 | if (atomic_read(&multifd_send_state->exiting)) { |
| 414 | return -1; |
| 415 | } |
| 416 | |
| 417 | qemu_sem_wait(&multifd_send_state->channels_ready); |
Laurent Vivier | 7e89a14 | 2020-06-17 13:31:54 +0200 | [diff] [blame] | 418 | /* |
| 419 | * next_channel can remain from a previous migration that was |
| 420 | * using more channels, so ensure it doesn't overflow if the |
| 421 | * limit is lower now. |
| 422 | */ |
| 423 | next_channel %= migrate_multifd_channels(); |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 424 | for (i = next_channel;; i = (i + 1) % migrate_multifd_channels()) { |
| 425 | p = &multifd_send_state->params[i]; |
| 426 | |
| 427 | qemu_mutex_lock(&p->mutex); |
| 428 | if (p->quit) { |
| 429 | error_report("%s: channel %d has already quit!", __func__, i); |
| 430 | qemu_mutex_unlock(&p->mutex); |
| 431 | return -1; |
| 432 | } |
| 433 | if (!p->pending_job) { |
| 434 | p->pending_job++; |
| 435 | next_channel = (i + 1) % migrate_multifd_channels(); |
| 436 | break; |
| 437 | } |
| 438 | qemu_mutex_unlock(&p->mutex); |
| 439 | } |
| 440 | assert(!p->pages->used); |
| 441 | assert(!p->pages->block); |
| 442 | |
| 443 | p->packet_num = multifd_send_state->packet_num++; |
| 444 | multifd_send_state->pages = p->pages; |
| 445 | p->pages = pages; |
| 446 | transferred = ((uint64_t) pages->used) * qemu_target_page_size() |
| 447 | + p->packet_len; |
| 448 | qemu_file_update_transfer(f, transferred); |
| 449 | ram_counters.multifd_bytes += transferred; |
| 450 | ram_counters.transferred += transferred;; |
| 451 | qemu_mutex_unlock(&p->mutex); |
| 452 | qemu_sem_post(&p->sem); |
| 453 | |
| 454 | return 1; |
| 455 | } |
| 456 | |
| 457 | int multifd_queue_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset) |
| 458 | { |
| 459 | MultiFDPages_t *pages = multifd_send_state->pages; |
| 460 | |
| 461 | if (!pages->block) { |
| 462 | pages->block = block; |
| 463 | } |
| 464 | |
| 465 | if (pages->block == block) { |
| 466 | pages->offset[pages->used] = offset; |
| 467 | pages->iov[pages->used].iov_base = block->host + offset; |
| 468 | pages->iov[pages->used].iov_len = qemu_target_page_size(); |
| 469 | pages->used++; |
| 470 | |
| 471 | if (pages->used < pages->allocated) { |
| 472 | return 1; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | if (multifd_send_pages(f) < 0) { |
| 477 | return -1; |
| 478 | } |
| 479 | |
| 480 | if (pages->block != block) { |
| 481 | return multifd_queue_page(f, block, offset); |
| 482 | } |
| 483 | |
| 484 | return 1; |
| 485 | } |
| 486 | |
| 487 | static void multifd_send_terminate_threads(Error *err) |
| 488 | { |
| 489 | int i; |
| 490 | |
| 491 | trace_multifd_send_terminate_threads(err != NULL); |
| 492 | |
| 493 | if (err) { |
| 494 | MigrationState *s = migrate_get_current(); |
| 495 | migrate_set_error(s, err); |
| 496 | if (s->state == MIGRATION_STATUS_SETUP || |
| 497 | s->state == MIGRATION_STATUS_PRE_SWITCHOVER || |
| 498 | s->state == MIGRATION_STATUS_DEVICE || |
| 499 | s->state == MIGRATION_STATUS_ACTIVE) { |
| 500 | migrate_set_state(&s->state, s->state, |
| 501 | MIGRATION_STATUS_FAILED); |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | /* |
| 506 | * We don't want to exit each threads twice. Depending on where |
| 507 | * we get the error, or if there are two independent errors in two |
| 508 | * threads at the same time, we can end calling this function |
| 509 | * twice. |
| 510 | */ |
| 511 | if (atomic_xchg(&multifd_send_state->exiting, 1)) { |
| 512 | return; |
| 513 | } |
| 514 | |
| 515 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 516 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 517 | |
| 518 | qemu_mutex_lock(&p->mutex); |
| 519 | p->quit = true; |
| 520 | qemu_sem_post(&p->sem); |
| 521 | qemu_mutex_unlock(&p->mutex); |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | void multifd_save_cleanup(void) |
| 526 | { |
| 527 | int i; |
| 528 | |
| 529 | if (!migrate_use_multifd()) { |
| 530 | return; |
| 531 | } |
| 532 | multifd_send_terminate_threads(NULL); |
| 533 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 534 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 535 | |
| 536 | if (p->running) { |
| 537 | qemu_thread_join(&p->thread); |
| 538 | } |
| 539 | } |
| 540 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 541 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 542 | Error *local_err = NULL; |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 543 | |
| 544 | socket_send_channel_destroy(p->c); |
| 545 | p->c = NULL; |
| 546 | qemu_mutex_destroy(&p->mutex); |
| 547 | qemu_sem_destroy(&p->sem); |
| 548 | qemu_sem_destroy(&p->sem_sync); |
| 549 | g_free(p->name); |
| 550 | p->name = NULL; |
| 551 | multifd_pages_clear(p->pages); |
| 552 | p->pages = NULL; |
| 553 | p->packet_len = 0; |
| 554 | g_free(p->packet); |
| 555 | p->packet = NULL; |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 556 | multifd_send_state->ops->send_cleanup(p, &local_err); |
| 557 | if (local_err) { |
| 558 | migrate_set_error(migrate_get_current(), local_err); |
Pan Nengyuan | 13f2cb2 | 2020-05-06 05:54:16 -0400 | [diff] [blame] | 559 | error_free(local_err); |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 560 | } |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 561 | } |
| 562 | qemu_sem_destroy(&multifd_send_state->channels_ready); |
| 563 | g_free(multifd_send_state->params); |
| 564 | multifd_send_state->params = NULL; |
| 565 | multifd_pages_clear(multifd_send_state->pages); |
| 566 | multifd_send_state->pages = NULL; |
| 567 | g_free(multifd_send_state); |
| 568 | multifd_send_state = NULL; |
| 569 | } |
| 570 | |
| 571 | void multifd_send_sync_main(QEMUFile *f) |
| 572 | { |
| 573 | int i; |
| 574 | |
| 575 | if (!migrate_use_multifd()) { |
| 576 | return; |
| 577 | } |
| 578 | if (multifd_send_state->pages->used) { |
| 579 | if (multifd_send_pages(f) < 0) { |
| 580 | error_report("%s: multifd_send_pages fail", __func__); |
| 581 | return; |
| 582 | } |
| 583 | } |
| 584 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 585 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 586 | |
| 587 | trace_multifd_send_sync_main_signal(p->id); |
| 588 | |
| 589 | qemu_mutex_lock(&p->mutex); |
| 590 | |
| 591 | if (p->quit) { |
| 592 | error_report("%s: channel %d has already quit", __func__, i); |
| 593 | qemu_mutex_unlock(&p->mutex); |
| 594 | return; |
| 595 | } |
| 596 | |
| 597 | p->packet_num = multifd_send_state->packet_num++; |
| 598 | p->flags |= MULTIFD_FLAG_SYNC; |
| 599 | p->pending_job++; |
| 600 | qemu_file_update_transfer(f, p->packet_len); |
| 601 | ram_counters.multifd_bytes += p->packet_len; |
| 602 | ram_counters.transferred += p->packet_len; |
| 603 | qemu_mutex_unlock(&p->mutex); |
| 604 | qemu_sem_post(&p->sem); |
| 605 | } |
| 606 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 607 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 608 | |
| 609 | trace_multifd_send_sync_main_wait(p->id); |
| 610 | qemu_sem_wait(&p->sem_sync); |
| 611 | } |
| 612 | trace_multifd_send_sync_main(multifd_send_state->packet_num); |
| 613 | } |
| 614 | |
| 615 | static void *multifd_send_thread(void *opaque) |
| 616 | { |
| 617 | MultiFDSendParams *p = opaque; |
| 618 | Error *local_err = NULL; |
| 619 | int ret = 0; |
| 620 | uint32_t flags = 0; |
| 621 | |
| 622 | trace_multifd_send_thread_start(p->id); |
| 623 | rcu_register_thread(); |
| 624 | |
| 625 | if (multifd_send_initial_packet(p, &local_err) < 0) { |
| 626 | ret = -1; |
| 627 | goto out; |
| 628 | } |
| 629 | /* initial packet */ |
| 630 | p->num_packets = 1; |
| 631 | |
| 632 | while (true) { |
| 633 | qemu_sem_wait(&p->sem); |
| 634 | |
| 635 | if (atomic_read(&multifd_send_state->exiting)) { |
| 636 | break; |
| 637 | } |
| 638 | qemu_mutex_lock(&p->mutex); |
| 639 | |
| 640 | if (p->pending_job) { |
| 641 | uint32_t used = p->pages->used; |
| 642 | uint64_t packet_num = p->packet_num; |
| 643 | flags = p->flags; |
| 644 | |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 645 | if (used) { |
| 646 | ret = multifd_send_state->ops->send_prepare(p, used, |
| 647 | &local_err); |
| 648 | if (ret != 0) { |
| 649 | qemu_mutex_unlock(&p->mutex); |
| 650 | break; |
| 651 | } |
| 652 | } |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 653 | multifd_send_fill_packet(p); |
| 654 | p->flags = 0; |
| 655 | p->num_packets++; |
| 656 | p->num_pages += used; |
| 657 | p->pages->used = 0; |
| 658 | p->pages->block = NULL; |
| 659 | qemu_mutex_unlock(&p->mutex); |
| 660 | |
| 661 | trace_multifd_send(p->id, packet_num, used, flags, |
| 662 | p->next_packet_size); |
| 663 | |
| 664 | ret = qio_channel_write_all(p->c, (void *)p->packet, |
| 665 | p->packet_len, &local_err); |
| 666 | if (ret != 0) { |
| 667 | break; |
| 668 | } |
| 669 | |
| 670 | if (used) { |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 671 | ret = multifd_send_state->ops->send_write(p, used, &local_err); |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 672 | if (ret != 0) { |
| 673 | break; |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | qemu_mutex_lock(&p->mutex); |
| 678 | p->pending_job--; |
| 679 | qemu_mutex_unlock(&p->mutex); |
| 680 | |
| 681 | if (flags & MULTIFD_FLAG_SYNC) { |
| 682 | qemu_sem_post(&p->sem_sync); |
| 683 | } |
| 684 | qemu_sem_post(&multifd_send_state->channels_ready); |
| 685 | } else if (p->quit) { |
| 686 | qemu_mutex_unlock(&p->mutex); |
| 687 | break; |
| 688 | } else { |
| 689 | qemu_mutex_unlock(&p->mutex); |
| 690 | /* sometimes there are spurious wakeups */ |
| 691 | } |
| 692 | } |
| 693 | |
| 694 | out: |
| 695 | if (local_err) { |
| 696 | trace_multifd_send_error(p->id); |
| 697 | multifd_send_terminate_threads(local_err); |
Pan Nengyuan | 13f2cb2 | 2020-05-06 05:54:16 -0400 | [diff] [blame] | 698 | error_free(local_err); |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | /* |
| 702 | * Error happen, I will exit, but I can't just leave, tell |
| 703 | * who pay attention to me. |
| 704 | */ |
| 705 | if (ret != 0) { |
| 706 | qemu_sem_post(&p->sem_sync); |
| 707 | qemu_sem_post(&multifd_send_state->channels_ready); |
| 708 | } |
| 709 | |
| 710 | qemu_mutex_lock(&p->mutex); |
| 711 | p->running = false; |
| 712 | qemu_mutex_unlock(&p->mutex); |
| 713 | |
| 714 | rcu_unregister_thread(); |
| 715 | trace_multifd_send_thread_end(p->id, p->num_packets, p->num_pages); |
| 716 | |
| 717 | return NULL; |
| 718 | } |
| 719 | |
| 720 | static void multifd_new_send_channel_async(QIOTask *task, gpointer opaque) |
| 721 | { |
| 722 | MultiFDSendParams *p = opaque; |
| 723 | QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task)); |
| 724 | Error *local_err = NULL; |
| 725 | |
| 726 | trace_multifd_new_send_channel_async(p->id); |
| 727 | if (qio_task_propagate_error(task, &local_err)) { |
| 728 | migrate_set_error(migrate_get_current(), local_err); |
| 729 | /* Error happen, we need to tell who pay attention to me */ |
| 730 | qemu_sem_post(&multifd_send_state->channels_ready); |
| 731 | qemu_sem_post(&p->sem_sync); |
| 732 | /* |
| 733 | * Although multifd_send_thread is not created, but main migration |
| 734 | * thread neet to judge whether it is running, so we need to mark |
| 735 | * its status. |
| 736 | */ |
| 737 | p->quit = true; |
Pan Nengyuan | ad31b8a | 2020-05-06 05:54:15 -0400 | [diff] [blame] | 738 | object_unref(OBJECT(sioc)); |
| 739 | error_free(local_err); |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 740 | } else { |
| 741 | p->c = QIO_CHANNEL(sioc); |
| 742 | qio_channel_set_delay(p->c, false); |
| 743 | p->running = true; |
| 744 | qemu_thread_create(&p->thread, p->name, multifd_send_thread, p, |
| 745 | QEMU_THREAD_JOINABLE); |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | int multifd_save_setup(Error **errp) |
| 750 | { |
| 751 | int thread_count; |
| 752 | uint32_t page_count = MULTIFD_PACKET_SIZE / qemu_target_page_size(); |
| 753 | uint8_t i; |
| 754 | |
| 755 | if (!migrate_use_multifd()) { |
| 756 | return 0; |
| 757 | } |
| 758 | thread_count = migrate_multifd_channels(); |
| 759 | multifd_send_state = g_malloc0(sizeof(*multifd_send_state)); |
| 760 | multifd_send_state->params = g_new0(MultiFDSendParams, thread_count); |
| 761 | multifd_send_state->pages = multifd_pages_init(page_count); |
| 762 | qemu_sem_init(&multifd_send_state->channels_ready, 0); |
| 763 | atomic_set(&multifd_send_state->exiting, 0); |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 764 | multifd_send_state->ops = multifd_ops[migrate_multifd_compression()]; |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 765 | |
| 766 | for (i = 0; i < thread_count; i++) { |
| 767 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 768 | |
| 769 | qemu_mutex_init(&p->mutex); |
| 770 | qemu_sem_init(&p->sem, 0); |
| 771 | qemu_sem_init(&p->sem_sync, 0); |
| 772 | p->quit = false; |
| 773 | p->pending_job = 0; |
| 774 | p->id = i; |
| 775 | p->pages = multifd_pages_init(page_count); |
| 776 | p->packet_len = sizeof(MultiFDPacket_t) |
| 777 | + sizeof(uint64_t) * page_count; |
| 778 | p->packet = g_malloc0(p->packet_len); |
| 779 | p->packet->magic = cpu_to_be32(MULTIFD_MAGIC); |
| 780 | p->packet->version = cpu_to_be32(MULTIFD_VERSION); |
| 781 | p->name = g_strdup_printf("multifdsend_%d", i); |
| 782 | socket_send_channel_create(multifd_new_send_channel_async, p); |
| 783 | } |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 784 | |
| 785 | for (i = 0; i < thread_count; i++) { |
| 786 | MultiFDSendParams *p = &multifd_send_state->params[i]; |
| 787 | Error *local_err = NULL; |
| 788 | int ret; |
| 789 | |
| 790 | ret = multifd_send_state->ops->send_setup(p, &local_err); |
| 791 | if (ret) { |
| 792 | error_propagate(errp, local_err); |
| 793 | return ret; |
| 794 | } |
| 795 | } |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 796 | return 0; |
| 797 | } |
| 798 | |
| 799 | struct { |
| 800 | MultiFDRecvParams *params; |
| 801 | /* number of created threads */ |
| 802 | int count; |
| 803 | /* syncs main thread and channels */ |
| 804 | QemuSemaphore sem_sync; |
| 805 | /* global number of generated multifd packets */ |
| 806 | uint64_t packet_num; |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 807 | /* multifd ops */ |
| 808 | MultiFDMethods *ops; |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 809 | } *multifd_recv_state; |
| 810 | |
| 811 | static void multifd_recv_terminate_threads(Error *err) |
| 812 | { |
| 813 | int i; |
| 814 | |
| 815 | trace_multifd_recv_terminate_threads(err != NULL); |
| 816 | |
| 817 | if (err) { |
| 818 | MigrationState *s = migrate_get_current(); |
| 819 | migrate_set_error(s, err); |
| 820 | if (s->state == MIGRATION_STATUS_SETUP || |
| 821 | s->state == MIGRATION_STATUS_ACTIVE) { |
| 822 | migrate_set_state(&s->state, s->state, |
| 823 | MIGRATION_STATUS_FAILED); |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 828 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 829 | |
| 830 | qemu_mutex_lock(&p->mutex); |
| 831 | p->quit = true; |
| 832 | /* |
| 833 | * We could arrive here for two reasons: |
| 834 | * - normal quit, i.e. everything went fine, just finished |
| 835 | * - error quit: We close the channels so the channel threads |
| 836 | * finish the qio_channel_read_all_eof() |
| 837 | */ |
| 838 | if (p->c) { |
| 839 | qio_channel_shutdown(p->c, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); |
| 840 | } |
| 841 | qemu_mutex_unlock(&p->mutex); |
| 842 | } |
| 843 | } |
| 844 | |
| 845 | int multifd_load_cleanup(Error **errp) |
| 846 | { |
| 847 | int i; |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 848 | |
| 849 | if (!migrate_use_multifd()) { |
| 850 | return 0; |
| 851 | } |
| 852 | multifd_recv_terminate_threads(NULL); |
| 853 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 854 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 855 | |
| 856 | if (p->running) { |
| 857 | p->quit = true; |
| 858 | /* |
| 859 | * multifd_recv_thread may hung at MULTIFD_FLAG_SYNC handle code, |
| 860 | * however try to wakeup it without harm in cleanup phase. |
| 861 | */ |
| 862 | qemu_sem_post(&p->sem_sync); |
| 863 | qemu_thread_join(&p->thread); |
| 864 | } |
| 865 | } |
| 866 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 867 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 868 | |
| 869 | object_unref(OBJECT(p->c)); |
| 870 | p->c = NULL; |
| 871 | qemu_mutex_destroy(&p->mutex); |
| 872 | qemu_sem_destroy(&p->sem_sync); |
| 873 | g_free(p->name); |
| 874 | p->name = NULL; |
| 875 | multifd_pages_clear(p->pages); |
| 876 | p->pages = NULL; |
| 877 | p->packet_len = 0; |
| 878 | g_free(p->packet); |
| 879 | p->packet = NULL; |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 880 | multifd_recv_state->ops->recv_cleanup(p); |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 881 | } |
| 882 | qemu_sem_destroy(&multifd_recv_state->sem_sync); |
| 883 | g_free(multifd_recv_state->params); |
| 884 | multifd_recv_state->params = NULL; |
| 885 | g_free(multifd_recv_state); |
| 886 | multifd_recv_state = NULL; |
| 887 | |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 888 | return 0; |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 889 | } |
| 890 | |
| 891 | void multifd_recv_sync_main(void) |
| 892 | { |
| 893 | int i; |
| 894 | |
| 895 | if (!migrate_use_multifd()) { |
| 896 | return; |
| 897 | } |
| 898 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 899 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 900 | |
| 901 | trace_multifd_recv_sync_main_wait(p->id); |
| 902 | qemu_sem_wait(&multifd_recv_state->sem_sync); |
| 903 | } |
| 904 | for (i = 0; i < migrate_multifd_channels(); i++) { |
| 905 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 906 | |
Daniel Brodsky | 6e8a355 | 2020-04-03 21:21:08 -0700 | [diff] [blame] | 907 | WITH_QEMU_LOCK_GUARD(&p->mutex) { |
| 908 | if (multifd_recv_state->packet_num < p->packet_num) { |
| 909 | multifd_recv_state->packet_num = p->packet_num; |
| 910 | } |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 911 | } |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 912 | trace_multifd_recv_sync_main_signal(p->id); |
| 913 | qemu_sem_post(&p->sem_sync); |
| 914 | } |
| 915 | trace_multifd_recv_sync_main(multifd_recv_state->packet_num); |
| 916 | } |
| 917 | |
| 918 | static void *multifd_recv_thread(void *opaque) |
| 919 | { |
| 920 | MultiFDRecvParams *p = opaque; |
| 921 | Error *local_err = NULL; |
| 922 | int ret; |
| 923 | |
| 924 | trace_multifd_recv_thread_start(p->id); |
| 925 | rcu_register_thread(); |
| 926 | |
| 927 | while (true) { |
| 928 | uint32_t used; |
| 929 | uint32_t flags; |
| 930 | |
| 931 | if (p->quit) { |
| 932 | break; |
| 933 | } |
| 934 | |
| 935 | ret = qio_channel_read_all_eof(p->c, (void *)p->packet, |
| 936 | p->packet_len, &local_err); |
| 937 | if (ret == 0) { /* EOF */ |
| 938 | break; |
| 939 | } |
| 940 | if (ret == -1) { /* Error */ |
| 941 | break; |
| 942 | } |
| 943 | |
| 944 | qemu_mutex_lock(&p->mutex); |
| 945 | ret = multifd_recv_unfill_packet(p, &local_err); |
| 946 | if (ret) { |
| 947 | qemu_mutex_unlock(&p->mutex); |
| 948 | break; |
| 949 | } |
| 950 | |
| 951 | used = p->pages->used; |
| 952 | flags = p->flags; |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 953 | /* recv methods don't know how to handle the SYNC flag */ |
| 954 | p->flags &= ~MULTIFD_FLAG_SYNC; |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 955 | trace_multifd_recv(p->id, p->packet_num, used, flags, |
| 956 | p->next_packet_size); |
| 957 | p->num_packets++; |
| 958 | p->num_pages += used; |
| 959 | qemu_mutex_unlock(&p->mutex); |
| 960 | |
| 961 | if (used) { |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 962 | ret = multifd_recv_state->ops->recv_pages(p, used, &local_err); |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 963 | if (ret != 0) { |
| 964 | break; |
| 965 | } |
| 966 | } |
| 967 | |
| 968 | if (flags & MULTIFD_FLAG_SYNC) { |
| 969 | qemu_sem_post(&multifd_recv_state->sem_sync); |
| 970 | qemu_sem_wait(&p->sem_sync); |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | if (local_err) { |
| 975 | multifd_recv_terminate_threads(local_err); |
Pan Nengyuan | 13f2cb2 | 2020-05-06 05:54:16 -0400 | [diff] [blame] | 976 | error_free(local_err); |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 977 | } |
| 978 | qemu_mutex_lock(&p->mutex); |
| 979 | p->running = false; |
| 980 | qemu_mutex_unlock(&p->mutex); |
| 981 | |
| 982 | rcu_unregister_thread(); |
| 983 | trace_multifd_recv_thread_end(p->id, p->num_packets, p->num_pages); |
| 984 | |
| 985 | return NULL; |
| 986 | } |
| 987 | |
| 988 | int multifd_load_setup(Error **errp) |
| 989 | { |
| 990 | int thread_count; |
| 991 | uint32_t page_count = MULTIFD_PACKET_SIZE / qemu_target_page_size(); |
| 992 | uint8_t i; |
| 993 | |
| 994 | if (!migrate_use_multifd()) { |
| 995 | return 0; |
| 996 | } |
| 997 | thread_count = migrate_multifd_channels(); |
| 998 | multifd_recv_state = g_malloc0(sizeof(*multifd_recv_state)); |
| 999 | multifd_recv_state->params = g_new0(MultiFDRecvParams, thread_count); |
| 1000 | atomic_set(&multifd_recv_state->count, 0); |
| 1001 | qemu_sem_init(&multifd_recv_state->sem_sync, 0); |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 1002 | multifd_recv_state->ops = multifd_ops[migrate_multifd_compression()]; |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 1003 | |
| 1004 | for (i = 0; i < thread_count; i++) { |
| 1005 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1006 | |
| 1007 | qemu_mutex_init(&p->mutex); |
| 1008 | qemu_sem_init(&p->sem_sync, 0); |
| 1009 | p->quit = false; |
| 1010 | p->id = i; |
| 1011 | p->pages = multifd_pages_init(page_count); |
| 1012 | p->packet_len = sizeof(MultiFDPacket_t) |
| 1013 | + sizeof(uint64_t) * page_count; |
| 1014 | p->packet = g_malloc0(p->packet_len); |
| 1015 | p->name = g_strdup_printf("multifdrecv_%d", i); |
| 1016 | } |
Juan Quintela | ab7cbb0 | 2019-05-15 13:37:46 +0200 | [diff] [blame] | 1017 | |
| 1018 | for (i = 0; i < thread_count; i++) { |
| 1019 | MultiFDRecvParams *p = &multifd_recv_state->params[i]; |
| 1020 | Error *local_err = NULL; |
| 1021 | int ret; |
| 1022 | |
| 1023 | ret = multifd_recv_state->ops->recv_setup(p, &local_err); |
| 1024 | if (ret) { |
| 1025 | error_propagate(errp, local_err); |
| 1026 | return ret; |
| 1027 | } |
| 1028 | } |
Juan Quintela | d32ca5a | 2020-01-22 16:16:07 +0100 | [diff] [blame] | 1029 | return 0; |
| 1030 | } |
| 1031 | |
| 1032 | bool multifd_recv_all_channels_created(void) |
| 1033 | { |
| 1034 | int thread_count = migrate_multifd_channels(); |
| 1035 | |
| 1036 | if (!migrate_use_multifd()) { |
| 1037 | return true; |
| 1038 | } |
| 1039 | |
| 1040 | return thread_count == atomic_read(&multifd_recv_state->count); |
| 1041 | } |
| 1042 | |
| 1043 | /* |
| 1044 | * Try to receive all multifd channels to get ready for the migration. |
| 1045 | * - Return true and do not set @errp when correctly receving all channels; |
| 1046 | * - Return false and do not set @errp when correctly receiving the current one; |
| 1047 | * - Return false and set @errp when failing to receive the current channel. |
| 1048 | */ |
| 1049 | bool multifd_recv_new_channel(QIOChannel *ioc, Error **errp) |
| 1050 | { |
| 1051 | MultiFDRecvParams *p; |
| 1052 | Error *local_err = NULL; |
| 1053 | int id; |
| 1054 | |
| 1055 | id = multifd_recv_initial_packet(ioc, &local_err); |
| 1056 | if (id < 0) { |
| 1057 | multifd_recv_terminate_threads(local_err); |
| 1058 | error_propagate_prepend(errp, local_err, |
| 1059 | "failed to receive packet" |
| 1060 | " via multifd channel %d: ", |
| 1061 | atomic_read(&multifd_recv_state->count)); |
| 1062 | return false; |
| 1063 | } |
| 1064 | trace_multifd_recv_new_channel(id); |
| 1065 | |
| 1066 | p = &multifd_recv_state->params[id]; |
| 1067 | if (p->c != NULL) { |
| 1068 | error_setg(&local_err, "multifd: received id '%d' already setup'", |
| 1069 | id); |
| 1070 | multifd_recv_terminate_threads(local_err); |
| 1071 | error_propagate(errp, local_err); |
| 1072 | return false; |
| 1073 | } |
| 1074 | p->c = ioc; |
| 1075 | object_ref(OBJECT(ioc)); |
| 1076 | /* initial packet */ |
| 1077 | p->num_packets = 1; |
| 1078 | |
| 1079 | p->running = true; |
| 1080 | qemu_thread_create(&p->thread, p->name, multifd_recv_thread, p, |
| 1081 | QEMU_THREAD_JOINABLE); |
| 1082 | atomic_inc(&multifd_recv_state->count); |
| 1083 | return atomic_read(&multifd_recv_state->count) == |
| 1084 | migrate_multifd_channels(); |
| 1085 | } |