1 /* 2 * QEMU live migration 3 * 4 * Copyright IBM, Corp. 2008 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 * Contributions after 2012-01-13 are licensed under the terms of the 13 * GNU GPL, version 2 or (at your option) any later version. 14 */ 15 16 #include "qemu/osdep.h" 17 #include "qemu/cutils.h" 18 #include "qemu/error-report.h" 19 #include "qemu/main-loop.h" 20 #include "migration/blocker.h" 21 #include "migration/migration.h" 22 #include "savevm.h" 23 #include "qemu-file-channel.h" 24 #include "migration/qemu-file.h" 25 #include "migration/vmstate.h" 26 #include "sysemu/sysemu.h" 27 #include "block/block.h" 28 #include "qapi/qmp/qerror.h" 29 #include "qapi/util.h" 30 #include "qemu/sockets.h" 31 #include "qemu/rcu.h" 32 #include "migration/block.h" 33 #include "postcopy-ram.h" 34 #include "qemu/thread.h" 35 #include "qmp-commands.h" 36 #include "trace.h" 37 #include "qapi-event.h" 38 #include "qom/cpu.h" 39 #include "exec/memory.h" 40 #include "exec/address-spaces.h" 41 #include "exec/target_page.h" 42 #include "io/channel-buffer.h" 43 #include "io/channel-tls.h" 44 #include "migration/colo.h" 45 46 #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ 47 48 /* Amount of time to allocate to each "chunk" of bandwidth-throttled 49 * data. */ 50 #define BUFFER_DELAY 100 51 #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) 52 53 /* Time in milliseconds we are allowed to stop the source, 54 * for sending the last part */ 55 #define DEFAULT_MIGRATE_SET_DOWNTIME 300 56 57 /* Maximum migrate downtime set to 2000 seconds */ 58 #define MAX_MIGRATE_DOWNTIME_SECONDS 2000 59 #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000) 60 61 /* Default compression thread count */ 62 #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 63 /* Default decompression thread count, usually decompression is at 64 * least 4 times as fast as compression.*/ 65 #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 66 /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ 67 #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 68 /* Define default autoconverge cpu throttle migration parameters */ 69 #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20 70 #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10 71 72 /* Migration XBZRLE default cache size */ 73 #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) 74 75 /* The delay time (in ms) between two COLO checkpoints 76 * Note: Please change this default value to 10000 when we support hybrid mode. 77 */ 78 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200 79 80 static NotifierList migration_state_notifiers = 81 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); 82 83 static bool deferred_incoming; 84 85 /* When we add fault tolerance, we could have several 86 migrations at once. For now we don't need to add 87 dynamic creation of migration */ 88 89 /* For outgoing */ 90 MigrationState *migrate_get_current(void) 91 { 92 static bool once; 93 static MigrationState current_migration = { 94 .state = MIGRATION_STATUS_NONE, 95 .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, 96 .mbps = -1, 97 .parameters = { 98 .compress_level = DEFAULT_MIGRATE_COMPRESS_LEVEL, 99 .compress_threads = DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT, 100 .decompress_threads = DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT, 101 .cpu_throttle_initial = DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL, 102 .cpu_throttle_increment = DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT, 103 .max_bandwidth = MAX_THROTTLE, 104 .downtime_limit = DEFAULT_MIGRATE_SET_DOWNTIME, 105 .x_checkpoint_delay = DEFAULT_MIGRATE_X_CHECKPOINT_DELAY, 106 }, 107 }; 108 109 if (!once) { 110 current_migration.parameters.tls_creds = g_strdup(""); 111 current_migration.parameters.tls_hostname = g_strdup(""); 112 once = true; 113 } 114 return ¤t_migration; 115 } 116 117 MigrationIncomingState *migration_incoming_get_current(void) 118 { 119 static bool once; 120 static MigrationIncomingState mis_current; 121 122 if (!once) { 123 mis_current.state = MIGRATION_STATUS_NONE; 124 memset(&mis_current, 0, sizeof(MigrationIncomingState)); 125 QLIST_INIT(&mis_current.loadvm_handlers); 126 qemu_mutex_init(&mis_current.rp_mutex); 127 qemu_event_init(&mis_current.main_thread_load_event, false); 128 once = true; 129 } 130 return &mis_current; 131 } 132 133 void migration_incoming_state_destroy(void) 134 { 135 struct MigrationIncomingState *mis = migration_incoming_get_current(); 136 137 qemu_event_destroy(&mis->main_thread_load_event); 138 loadvm_free_handlers(mis); 139 } 140 141 142 typedef struct { 143 bool optional; 144 uint32_t size; 145 uint8_t runstate[100]; 146 RunState state; 147 bool received; 148 } GlobalState; 149 150 static GlobalState global_state; 151 152 int global_state_store(void) 153 { 154 if (!runstate_store((char *)global_state.runstate, 155 sizeof(global_state.runstate))) { 156 error_report("runstate name too big: %s", global_state.runstate); 157 trace_migrate_state_too_big(); 158 return -EINVAL; 159 } 160 return 0; 161 } 162 163 void global_state_store_running(void) 164 { 165 const char *state = RunState_lookup[RUN_STATE_RUNNING]; 166 strncpy((char *)global_state.runstate, 167 state, sizeof(global_state.runstate)); 168 } 169 170 static bool global_state_received(void) 171 { 172 return global_state.received; 173 } 174 175 static RunState global_state_get_runstate(void) 176 { 177 return global_state.state; 178 } 179 180 void global_state_set_optional(void) 181 { 182 global_state.optional = true; 183 } 184 185 static bool global_state_needed(void *opaque) 186 { 187 GlobalState *s = opaque; 188 char *runstate = (char *)s->runstate; 189 190 /* If it is not optional, it is mandatory */ 191 192 if (s->optional == false) { 193 return true; 194 } 195 196 /* If state is running or paused, it is not needed */ 197 198 if (strcmp(runstate, "running") == 0 || 199 strcmp(runstate, "paused") == 0) { 200 return false; 201 } 202 203 /* for any other state it is needed */ 204 return true; 205 } 206 207 static int global_state_post_load(void *opaque, int version_id) 208 { 209 GlobalState *s = opaque; 210 Error *local_err = NULL; 211 int r; 212 char *runstate = (char *)s->runstate; 213 214 s->received = true; 215 trace_migrate_global_state_post_load(runstate); 216 217 r = qapi_enum_parse(RunState_lookup, runstate, RUN_STATE__MAX, 218 -1, &local_err); 219 220 if (r == -1) { 221 if (local_err) { 222 error_report_err(local_err); 223 } 224 return -EINVAL; 225 } 226 s->state = r; 227 228 return 0; 229 } 230 231 static void global_state_pre_save(void *opaque) 232 { 233 GlobalState *s = opaque; 234 235 trace_migrate_global_state_pre_save((char *)s->runstate); 236 s->size = strlen((char *)s->runstate) + 1; 237 } 238 239 static const VMStateDescription vmstate_globalstate = { 240 .name = "globalstate", 241 .version_id = 1, 242 .minimum_version_id = 1, 243 .post_load = global_state_post_load, 244 .pre_save = global_state_pre_save, 245 .needed = global_state_needed, 246 .fields = (VMStateField[]) { 247 VMSTATE_UINT32(size, GlobalState), 248 VMSTATE_BUFFER(runstate, GlobalState), 249 VMSTATE_END_OF_LIST() 250 }, 251 }; 252 253 void register_global_state(void) 254 { 255 /* We would use it independently that we receive it */ 256 strcpy((char *)&global_state.runstate, ""); 257 global_state.received = false; 258 vmstate_register(NULL, 0, &vmstate_globalstate, &global_state); 259 } 260 261 static void migrate_generate_event(int new_state) 262 { 263 if (migrate_use_events()) { 264 qapi_event_send_migration(new_state, &error_abort); 265 } 266 } 267 268 /* 269 * Called on -incoming with a defer: uri. 270 * The migration can be started later after any parameters have been 271 * changed. 272 */ 273 static void deferred_incoming_migration(Error **errp) 274 { 275 if (deferred_incoming) { 276 error_setg(errp, "Incoming migration already deferred"); 277 } 278 deferred_incoming = true; 279 } 280 281 /* Request a range of pages from the source VM at the given 282 * start address. 283 * rbname: Name of the RAMBlock to request the page in, if NULL it's the same 284 * as the last request (a name must have been given previously) 285 * Start: Address offset within the RB 286 * Len: Length in bytes required - must be a multiple of pagesize 287 */ 288 void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname, 289 ram_addr_t start, size_t len) 290 { 291 uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ 292 size_t msglen = 12; /* start + len */ 293 294 *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); 295 *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); 296 297 if (rbname) { 298 int rbname_len = strlen(rbname); 299 assert(rbname_len < 256); 300 301 bufc[msglen++] = rbname_len; 302 memcpy(bufc + msglen, rbname, rbname_len); 303 msglen += rbname_len; 304 migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES_ID, msglen, bufc); 305 } else { 306 migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES, msglen, bufc); 307 } 308 } 309 310 void qemu_start_incoming_migration(const char *uri, Error **errp) 311 { 312 const char *p; 313 314 qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort); 315 if (!strcmp(uri, "defer")) { 316 deferred_incoming_migration(errp); 317 } else if (strstart(uri, "tcp:", &p)) { 318 tcp_start_incoming_migration(p, errp); 319 #ifdef CONFIG_RDMA 320 } else if (strstart(uri, "rdma:", &p)) { 321 rdma_start_incoming_migration(p, errp); 322 #endif 323 } else if (strstart(uri, "exec:", &p)) { 324 exec_start_incoming_migration(p, errp); 325 } else if (strstart(uri, "unix:", &p)) { 326 unix_start_incoming_migration(p, errp); 327 } else if (strstart(uri, "fd:", &p)) { 328 fd_start_incoming_migration(p, errp); 329 } else { 330 error_setg(errp, "unknown migration protocol: %s", uri); 331 } 332 } 333 334 static void process_incoming_migration_bh(void *opaque) 335 { 336 Error *local_err = NULL; 337 MigrationIncomingState *mis = opaque; 338 339 /* Make sure all file formats flush their mutable metadata. 340 * If we get an error here, just don't restart the VM yet. */ 341 bdrv_invalidate_cache_all(&local_err); 342 if (local_err) { 343 error_report_err(local_err); 344 local_err = NULL; 345 autostart = false; 346 } 347 348 /* 349 * This must happen after all error conditions are dealt with and 350 * we're sure the VM is going to be running on this host. 351 */ 352 qemu_announce_self(); 353 354 /* If global state section was not received or we are in running 355 state, we need to obey autostart. Any other state is set with 356 runstate_set. */ 357 358 if (!global_state_received() || 359 global_state_get_runstate() == RUN_STATE_RUNNING) { 360 if (autostart) { 361 vm_start(); 362 } else { 363 runstate_set(RUN_STATE_PAUSED); 364 } 365 } else { 366 runstate_set(global_state_get_runstate()); 367 } 368 migrate_decompress_threads_join(); 369 /* 370 * This must happen after any state changes since as soon as an external 371 * observer sees this event they might start to prod at the VM assuming 372 * it's ready to use. 373 */ 374 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, 375 MIGRATION_STATUS_COMPLETED); 376 qemu_bh_delete(mis->bh); 377 migration_incoming_state_destroy(); 378 } 379 380 static void process_incoming_migration_co(void *opaque) 381 { 382 QEMUFile *f = opaque; 383 MigrationIncomingState *mis = migration_incoming_get_current(); 384 PostcopyState ps; 385 int ret; 386 387 mis->from_src_file = f; 388 mis->largest_page_size = qemu_ram_pagesize_largest(); 389 postcopy_state_set(POSTCOPY_INCOMING_NONE); 390 migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, 391 MIGRATION_STATUS_ACTIVE); 392 ret = qemu_loadvm_state(f); 393 394 ps = postcopy_state_get(); 395 trace_process_incoming_migration_co_end(ret, ps); 396 if (ps != POSTCOPY_INCOMING_NONE) { 397 if (ps == POSTCOPY_INCOMING_ADVISE) { 398 /* 399 * Where a migration had postcopy enabled (and thus went to advise) 400 * but managed to complete within the precopy period, we can use 401 * the normal exit. 402 */ 403 postcopy_ram_incoming_cleanup(mis); 404 } else if (ret >= 0) { 405 /* 406 * Postcopy was started, cleanup should happen at the end of the 407 * postcopy thread. 408 */ 409 trace_process_incoming_migration_co_postcopy_end_main(); 410 return; 411 } 412 /* Else if something went wrong then just fall out of the normal exit */ 413 } 414 415 /* we get COLO info, and know if we are in COLO mode */ 416 if (!ret && migration_incoming_enable_colo()) { 417 mis->migration_incoming_co = qemu_coroutine_self(); 418 qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming", 419 colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE); 420 mis->have_colo_incoming_thread = true; 421 qemu_coroutine_yield(); 422 423 /* Wait checkpoint incoming thread exit before free resource */ 424 qemu_thread_join(&mis->colo_incoming_thread); 425 } 426 427 if (ret < 0) { 428 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, 429 MIGRATION_STATUS_FAILED); 430 error_report("load of migration failed: %s", strerror(-ret)); 431 migrate_decompress_threads_join(); 432 exit(EXIT_FAILURE); 433 } 434 435 qemu_fclose(f); 436 free_xbzrle_decoded_buf(); 437 438 mis->bh = qemu_bh_new(process_incoming_migration_bh, mis); 439 qemu_bh_schedule(mis->bh); 440 } 441 442 void migration_fd_process_incoming(QEMUFile *f) 443 { 444 Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, f); 445 446 migrate_decompress_threads_create(); 447 qemu_file_set_blocking(f, false); 448 qemu_coroutine_enter(co); 449 } 450 451 /* 452 * Send a message on the return channel back to the source 453 * of the migration. 454 */ 455 void migrate_send_rp_message(MigrationIncomingState *mis, 456 enum mig_rp_message_type message_type, 457 uint16_t len, void *data) 458 { 459 trace_migrate_send_rp_message((int)message_type, len); 460 qemu_mutex_lock(&mis->rp_mutex); 461 qemu_put_be16(mis->to_src_file, (unsigned int)message_type); 462 qemu_put_be16(mis->to_src_file, len); 463 qemu_put_buffer(mis->to_src_file, data, len); 464 qemu_fflush(mis->to_src_file); 465 qemu_mutex_unlock(&mis->rp_mutex); 466 } 467 468 /* 469 * Send a 'SHUT' message on the return channel with the given value 470 * to indicate that we've finished with the RP. Non-0 value indicates 471 * error. 472 */ 473 void migrate_send_rp_shut(MigrationIncomingState *mis, 474 uint32_t value) 475 { 476 uint32_t buf; 477 478 buf = cpu_to_be32(value); 479 migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); 480 } 481 482 /* 483 * Send a 'PONG' message on the return channel with the given value 484 * (normally in response to a 'PING') 485 */ 486 void migrate_send_rp_pong(MigrationIncomingState *mis, 487 uint32_t value) 488 { 489 uint32_t buf; 490 491 buf = cpu_to_be32(value); 492 migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); 493 } 494 495 MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) 496 { 497 MigrationCapabilityStatusList *head = NULL; 498 MigrationCapabilityStatusList *caps; 499 MigrationState *s = migrate_get_current(); 500 int i; 501 502 caps = NULL; /* silence compiler warning */ 503 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { 504 #ifndef CONFIG_LIVE_BLOCK_MIGRATION 505 if (i == MIGRATION_CAPABILITY_BLOCK) { 506 continue; 507 } 508 #endif 509 if (i == MIGRATION_CAPABILITY_X_COLO && !colo_supported()) { 510 continue; 511 } 512 if (head == NULL) { 513 head = g_malloc0(sizeof(*caps)); 514 caps = head; 515 } else { 516 caps->next = g_malloc0(sizeof(*caps)); 517 caps = caps->next; 518 } 519 caps->value = 520 g_malloc(sizeof(*caps->value)); 521 caps->value->capability = i; 522 caps->value->state = s->enabled_capabilities[i]; 523 } 524 525 return head; 526 } 527 528 MigrationParameters *qmp_query_migrate_parameters(Error **errp) 529 { 530 MigrationParameters *params; 531 MigrationState *s = migrate_get_current(); 532 533 params = g_malloc0(sizeof(*params)); 534 params->has_compress_level = true; 535 params->compress_level = s->parameters.compress_level; 536 params->has_compress_threads = true; 537 params->compress_threads = s->parameters.compress_threads; 538 params->has_decompress_threads = true; 539 params->decompress_threads = s->parameters.decompress_threads; 540 params->has_cpu_throttle_initial = true; 541 params->cpu_throttle_initial = s->parameters.cpu_throttle_initial; 542 params->has_cpu_throttle_increment = true; 543 params->cpu_throttle_increment = s->parameters.cpu_throttle_increment; 544 params->has_tls_creds = !!s->parameters.tls_creds; 545 params->tls_creds = g_strdup(s->parameters.tls_creds); 546 params->has_tls_hostname = !!s->parameters.tls_hostname; 547 params->tls_hostname = g_strdup(s->parameters.tls_hostname); 548 params->has_max_bandwidth = true; 549 params->max_bandwidth = s->parameters.max_bandwidth; 550 params->has_downtime_limit = true; 551 params->downtime_limit = s->parameters.downtime_limit; 552 params->has_x_checkpoint_delay = true; 553 params->x_checkpoint_delay = s->parameters.x_checkpoint_delay; 554 params->has_block_incremental = true; 555 params->block_incremental = s->parameters.block_incremental; 556 557 return params; 558 } 559 560 /* 561 * Return true if we're already in the middle of a migration 562 * (i.e. any of the active or setup states) 563 */ 564 static bool migration_is_setup_or_active(int state) 565 { 566 switch (state) { 567 case MIGRATION_STATUS_ACTIVE: 568 case MIGRATION_STATUS_POSTCOPY_ACTIVE: 569 case MIGRATION_STATUS_SETUP: 570 return true; 571 572 default: 573 return false; 574 575 } 576 } 577 578 static void get_xbzrle_cache_stats(MigrationInfo *info) 579 { 580 if (migrate_use_xbzrle()) { 581 info->has_xbzrle_cache = true; 582 info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); 583 info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); 584 info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); 585 info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); 586 info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); 587 info->xbzrle_cache->cache_miss_rate = xbzrle_mig_cache_miss_rate(); 588 info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); 589 } 590 } 591 592 static void populate_ram_info(MigrationInfo *info, MigrationState *s) 593 { 594 info->has_ram = true; 595 info->ram = g_malloc0(sizeof(*info->ram)); 596 info->ram->transferred = ram_bytes_transferred(); 597 info->ram->total = ram_bytes_total(); 598 info->ram->duplicate = dup_mig_pages_transferred(); 599 /* legacy value. It is not used anymore */ 600 info->ram->skipped = 0; 601 info->ram->normal = norm_mig_pages_transferred(); 602 info->ram->normal_bytes = norm_mig_pages_transferred() * 603 qemu_target_page_size(); 604 info->ram->mbps = s->mbps; 605 info->ram->dirty_sync_count = ram_dirty_sync_count(); 606 info->ram->postcopy_requests = ram_postcopy_requests(); 607 info->ram->page_size = qemu_target_page_size(); 608 609 if (s->state != MIGRATION_STATUS_COMPLETED) { 610 info->ram->remaining = ram_bytes_remaining(); 611 info->ram->dirty_pages_rate = ram_dirty_pages_rate(); 612 } 613 } 614 615 MigrationInfo *qmp_query_migrate(Error **errp) 616 { 617 MigrationInfo *info = g_malloc0(sizeof(*info)); 618 MigrationState *s = migrate_get_current(); 619 620 switch (s->state) { 621 case MIGRATION_STATUS_NONE: 622 /* no migration has happened ever */ 623 break; 624 case MIGRATION_STATUS_SETUP: 625 info->has_status = true; 626 info->has_total_time = false; 627 break; 628 case MIGRATION_STATUS_ACTIVE: 629 case MIGRATION_STATUS_CANCELLING: 630 info->has_status = true; 631 info->has_total_time = true; 632 info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) 633 - s->total_time; 634 info->has_expected_downtime = true; 635 info->expected_downtime = s->expected_downtime; 636 info->has_setup_time = true; 637 info->setup_time = s->setup_time; 638 639 populate_ram_info(info, s); 640 641 if (blk_mig_active()) { 642 info->has_disk = true; 643 info->disk = g_malloc0(sizeof(*info->disk)); 644 info->disk->transferred = blk_mig_bytes_transferred(); 645 info->disk->remaining = blk_mig_bytes_remaining(); 646 info->disk->total = blk_mig_bytes_total(); 647 } 648 649 if (cpu_throttle_active()) { 650 info->has_cpu_throttle_percentage = true; 651 info->cpu_throttle_percentage = cpu_throttle_get_percentage(); 652 } 653 654 get_xbzrle_cache_stats(info); 655 break; 656 case MIGRATION_STATUS_POSTCOPY_ACTIVE: 657 /* Mostly the same as active; TODO add some postcopy stats */ 658 info->has_status = true; 659 info->has_total_time = true; 660 info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) 661 - s->total_time; 662 info->has_expected_downtime = true; 663 info->expected_downtime = s->expected_downtime; 664 info->has_setup_time = true; 665 info->setup_time = s->setup_time; 666 667 populate_ram_info(info, s); 668 669 if (blk_mig_active()) { 670 info->has_disk = true; 671 info->disk = g_malloc0(sizeof(*info->disk)); 672 info->disk->transferred = blk_mig_bytes_transferred(); 673 info->disk->remaining = blk_mig_bytes_remaining(); 674 info->disk->total = blk_mig_bytes_total(); 675 } 676 677 get_xbzrle_cache_stats(info); 678 break; 679 case MIGRATION_STATUS_COLO: 680 info->has_status = true; 681 /* TODO: display COLO specific information (checkpoint info etc.) */ 682 break; 683 case MIGRATION_STATUS_COMPLETED: 684 get_xbzrle_cache_stats(info); 685 686 info->has_status = true; 687 info->has_total_time = true; 688 info->total_time = s->total_time; 689 info->has_downtime = true; 690 info->downtime = s->downtime; 691 info->has_setup_time = true; 692 info->setup_time = s->setup_time; 693 694 populate_ram_info(info, s); 695 break; 696 case MIGRATION_STATUS_FAILED: 697 info->has_status = true; 698 if (s->error) { 699 info->has_error_desc = true; 700 info->error_desc = g_strdup(error_get_pretty(s->error)); 701 } 702 break; 703 case MIGRATION_STATUS_CANCELLED: 704 info->has_status = true; 705 break; 706 } 707 info->status = s->state; 708 709 return info; 710 } 711 712 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, 713 Error **errp) 714 { 715 MigrationState *s = migrate_get_current(); 716 MigrationCapabilityStatusList *cap; 717 bool old_postcopy_cap = migrate_postcopy_ram(); 718 719 if (migration_is_setup_or_active(s->state)) { 720 error_setg(errp, QERR_MIGRATION_ACTIVE); 721 return; 722 } 723 724 for (cap = params; cap; cap = cap->next) { 725 #ifndef CONFIG_LIVE_BLOCK_MIGRATION 726 if (cap->value->capability == MIGRATION_CAPABILITY_BLOCK 727 && cap->value->state) { 728 error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) " 729 "block migration"); 730 error_append_hint(errp, "Use drive_mirror+NBD instead.\n"); 731 continue; 732 } 733 #endif 734 if (cap->value->capability == MIGRATION_CAPABILITY_X_COLO) { 735 if (!colo_supported()) { 736 error_setg(errp, "COLO is not currently supported, please" 737 " configure with --enable-colo option in order to" 738 " support COLO feature"); 739 continue; 740 } 741 } 742 s->enabled_capabilities[cap->value->capability] = cap->value->state; 743 } 744 745 if (migrate_postcopy_ram()) { 746 if (migrate_use_compression()) { 747 /* The decompression threads asynchronously write into RAM 748 * rather than use the atomic copies needed to avoid 749 * userfaulting. It should be possible to fix the decompression 750 * threads for compatibility in future. 751 */ 752 error_report("Postcopy is not currently compatible with " 753 "compression"); 754 s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] = 755 false; 756 } 757 /* This check is reasonably expensive, so only when it's being 758 * set the first time, also it's only the destination that needs 759 * special support. 760 */ 761 if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) && 762 !postcopy_ram_supported_by_host()) { 763 /* postcopy_ram_supported_by_host will have emitted a more 764 * detailed message 765 */ 766 error_report("Postcopy is not supported"); 767 s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] = 768 false; 769 } 770 } 771 } 772 773 void qmp_migrate_set_parameters(MigrationParameters *params, Error **errp) 774 { 775 MigrationState *s = migrate_get_current(); 776 777 if (params->has_compress_level && 778 (params->compress_level < 0 || params->compress_level > 9)) { 779 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level", 780 "is invalid, it should be in the range of 0 to 9"); 781 return; 782 } 783 if (params->has_compress_threads && 784 (params->compress_threads < 1 || params->compress_threads > 255)) { 785 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 786 "compress_threads", 787 "is invalid, it should be in the range of 1 to 255"); 788 return; 789 } 790 if (params->has_decompress_threads && 791 (params->decompress_threads < 1 || params->decompress_threads > 255)) { 792 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 793 "decompress_threads", 794 "is invalid, it should be in the range of 1 to 255"); 795 return; 796 } 797 if (params->has_cpu_throttle_initial && 798 (params->cpu_throttle_initial < 1 || 799 params->cpu_throttle_initial > 99)) { 800 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 801 "cpu_throttle_initial", 802 "an integer in the range of 1 to 99"); 803 return; 804 } 805 if (params->has_cpu_throttle_increment && 806 (params->cpu_throttle_increment < 1 || 807 params->cpu_throttle_increment > 99)) { 808 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 809 "cpu_throttle_increment", 810 "an integer in the range of 1 to 99"); 811 return; 812 } 813 if (params->has_max_bandwidth && 814 (params->max_bandwidth < 0 || params->max_bandwidth > SIZE_MAX)) { 815 error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the" 816 " range of 0 to %zu bytes/second", SIZE_MAX); 817 return; 818 } 819 if (params->has_downtime_limit && 820 (params->downtime_limit < 0 || 821 params->downtime_limit > MAX_MIGRATE_DOWNTIME)) { 822 error_setg(errp, "Parameter 'downtime_limit' expects an integer in " 823 "the range of 0 to %d milliseconds", 824 MAX_MIGRATE_DOWNTIME); 825 return; 826 } 827 if (params->has_x_checkpoint_delay && (params->x_checkpoint_delay < 0)) { 828 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 829 "x_checkpoint_delay", 830 "is invalid, it should be positive"); 831 } 832 833 if (params->has_compress_level) { 834 s->parameters.compress_level = params->compress_level; 835 } 836 if (params->has_compress_threads) { 837 s->parameters.compress_threads = params->compress_threads; 838 } 839 if (params->has_decompress_threads) { 840 s->parameters.decompress_threads = params->decompress_threads; 841 } 842 if (params->has_cpu_throttle_initial) { 843 s->parameters.cpu_throttle_initial = params->cpu_throttle_initial; 844 } 845 if (params->has_cpu_throttle_increment) { 846 s->parameters.cpu_throttle_increment = params->cpu_throttle_increment; 847 } 848 if (params->has_tls_creds) { 849 g_free(s->parameters.tls_creds); 850 s->parameters.tls_creds = g_strdup(params->tls_creds); 851 } 852 if (params->has_tls_hostname) { 853 g_free(s->parameters.tls_hostname); 854 s->parameters.tls_hostname = g_strdup(params->tls_hostname); 855 } 856 if (params->has_max_bandwidth) { 857 s->parameters.max_bandwidth = params->max_bandwidth; 858 if (s->to_dst_file) { 859 qemu_file_set_rate_limit(s->to_dst_file, 860 s->parameters.max_bandwidth / XFER_LIMIT_RATIO); 861 } 862 } 863 if (params->has_downtime_limit) { 864 s->parameters.downtime_limit = params->downtime_limit; 865 } 866 867 if (params->has_x_checkpoint_delay) { 868 s->parameters.x_checkpoint_delay = params->x_checkpoint_delay; 869 if (migration_in_colo_state()) { 870 colo_checkpoint_notify(s); 871 } 872 } 873 if (params->has_block_incremental) { 874 s->parameters.block_incremental = params->block_incremental; 875 } 876 } 877 878 879 void qmp_migrate_start_postcopy(Error **errp) 880 { 881 MigrationState *s = migrate_get_current(); 882 883 if (!migrate_postcopy_ram()) { 884 error_setg(errp, "Enable postcopy with migrate_set_capability before" 885 " the start of migration"); 886 return; 887 } 888 889 if (s->state == MIGRATION_STATUS_NONE) { 890 error_setg(errp, "Postcopy must be started after migration has been" 891 " started"); 892 return; 893 } 894 /* 895 * we don't error if migration has finished since that would be racy 896 * with issuing this command. 897 */ 898 atomic_set(&s->start_postcopy, true); 899 } 900 901 /* shared migration helpers */ 902 903 void migrate_set_state(int *state, int old_state, int new_state) 904 { 905 if (atomic_cmpxchg(state, old_state, new_state) == old_state) { 906 trace_migrate_set_state(new_state); 907 migrate_generate_event(new_state); 908 } 909 } 910 911 void migrate_set_block_enabled(bool value, Error **errp) 912 { 913 MigrationCapabilityStatusList *cap; 914 915 cap = g_new0(MigrationCapabilityStatusList, 1); 916 cap->value = g_new0(MigrationCapabilityStatus, 1); 917 cap->value->capability = MIGRATION_CAPABILITY_BLOCK; 918 cap->value->state = value; 919 qmp_migrate_set_capabilities(cap, errp); 920 qapi_free_MigrationCapabilityStatusList(cap); 921 } 922 923 static void migrate_set_block_incremental(MigrationState *s, bool value) 924 { 925 s->parameters.block_incremental = value; 926 } 927 928 static void block_cleanup_parameters(MigrationState *s) 929 { 930 if (s->must_remove_block_options) { 931 /* setting to false can never fail */ 932 migrate_set_block_enabled(false, &error_abort); 933 migrate_set_block_incremental(s, false); 934 s->must_remove_block_options = false; 935 } 936 } 937 938 static void migrate_fd_cleanup(void *opaque) 939 { 940 MigrationState *s = opaque; 941 942 qemu_bh_delete(s->cleanup_bh); 943 s->cleanup_bh = NULL; 944 945 migration_page_queue_free(); 946 947 if (s->to_dst_file) { 948 trace_migrate_fd_cleanup(); 949 qemu_mutex_unlock_iothread(); 950 if (s->migration_thread_running) { 951 qemu_thread_join(&s->thread); 952 s->migration_thread_running = false; 953 } 954 qemu_mutex_lock_iothread(); 955 956 migrate_compress_threads_join(); 957 qemu_fclose(s->to_dst_file); 958 s->to_dst_file = NULL; 959 } 960 961 assert((s->state != MIGRATION_STATUS_ACTIVE) && 962 (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE)); 963 964 if (s->state == MIGRATION_STATUS_CANCELLING) { 965 migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING, 966 MIGRATION_STATUS_CANCELLED); 967 } 968 969 notifier_list_notify(&migration_state_notifiers, s); 970 block_cleanup_parameters(s); 971 } 972 973 void migrate_fd_error(MigrationState *s, const Error *error) 974 { 975 trace_migrate_fd_error(error_get_pretty(error)); 976 assert(s->to_dst_file == NULL); 977 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 978 MIGRATION_STATUS_FAILED); 979 if (!s->error) { 980 s->error = error_copy(error); 981 } 982 notifier_list_notify(&migration_state_notifiers, s); 983 block_cleanup_parameters(s); 984 } 985 986 static void migrate_fd_cancel(MigrationState *s) 987 { 988 int old_state ; 989 QEMUFile *f = migrate_get_current()->to_dst_file; 990 trace_migrate_fd_cancel(); 991 992 if (s->rp_state.from_dst_file) { 993 /* shutdown the rp socket, so causing the rp thread to shutdown */ 994 qemu_file_shutdown(s->rp_state.from_dst_file); 995 } 996 997 do { 998 old_state = s->state; 999 if (!migration_is_setup_or_active(old_state)) { 1000 break; 1001 } 1002 migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING); 1003 } while (s->state != MIGRATION_STATUS_CANCELLING); 1004 1005 /* 1006 * If we're unlucky the migration code might be stuck somewhere in a 1007 * send/write while the network has failed and is waiting to timeout; 1008 * if we've got shutdown(2) available then we can force it to quit. 1009 * The outgoing qemu file gets closed in migrate_fd_cleanup that is 1010 * called in a bh, so there is no race against this cancel. 1011 */ 1012 if (s->state == MIGRATION_STATUS_CANCELLING && f) { 1013 qemu_file_shutdown(f); 1014 } 1015 if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) { 1016 Error *local_err = NULL; 1017 1018 bdrv_invalidate_cache_all(&local_err); 1019 if (local_err) { 1020 error_report_err(local_err); 1021 } else { 1022 s->block_inactive = false; 1023 } 1024 } 1025 block_cleanup_parameters(s); 1026 } 1027 1028 void add_migration_state_change_notifier(Notifier *notify) 1029 { 1030 notifier_list_add(&migration_state_notifiers, notify); 1031 } 1032 1033 void remove_migration_state_change_notifier(Notifier *notify) 1034 { 1035 notifier_remove(notify); 1036 } 1037 1038 bool migration_in_setup(MigrationState *s) 1039 { 1040 return s->state == MIGRATION_STATUS_SETUP; 1041 } 1042 1043 bool migration_has_finished(MigrationState *s) 1044 { 1045 return s->state == MIGRATION_STATUS_COMPLETED; 1046 } 1047 1048 bool migration_has_failed(MigrationState *s) 1049 { 1050 return (s->state == MIGRATION_STATUS_CANCELLED || 1051 s->state == MIGRATION_STATUS_FAILED); 1052 } 1053 1054 bool migration_in_postcopy(void) 1055 { 1056 MigrationState *s = migrate_get_current(); 1057 1058 return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); 1059 } 1060 1061 bool migration_in_postcopy_after_devices(MigrationState *s) 1062 { 1063 return migration_in_postcopy() && s->postcopy_after_devices; 1064 } 1065 1066 bool migration_is_idle(void) 1067 { 1068 MigrationState *s = migrate_get_current(); 1069 1070 switch (s->state) { 1071 case MIGRATION_STATUS_NONE: 1072 case MIGRATION_STATUS_CANCELLED: 1073 case MIGRATION_STATUS_COMPLETED: 1074 case MIGRATION_STATUS_FAILED: 1075 return true; 1076 case MIGRATION_STATUS_SETUP: 1077 case MIGRATION_STATUS_CANCELLING: 1078 case MIGRATION_STATUS_ACTIVE: 1079 case MIGRATION_STATUS_POSTCOPY_ACTIVE: 1080 case MIGRATION_STATUS_COLO: 1081 return false; 1082 case MIGRATION_STATUS__MAX: 1083 g_assert_not_reached(); 1084 } 1085 1086 return false; 1087 } 1088 1089 MigrationState *migrate_init(void) 1090 { 1091 MigrationState *s = migrate_get_current(); 1092 1093 /* 1094 * Reinitialise all migration state, except 1095 * parameters/capabilities that the user set, and 1096 * locks. 1097 */ 1098 s->bytes_xfer = 0; 1099 s->xfer_limit = 0; 1100 s->cleanup_bh = 0; 1101 s->to_dst_file = NULL; 1102 s->state = MIGRATION_STATUS_NONE; 1103 s->rp_state.from_dst_file = NULL; 1104 s->rp_state.error = false; 1105 s->mbps = 0.0; 1106 s->downtime = 0; 1107 s->expected_downtime = 0; 1108 s->setup_time = 0; 1109 s->start_postcopy = false; 1110 s->postcopy_after_devices = false; 1111 s->migration_thread_running = false; 1112 error_free(s->error); 1113 s->error = NULL; 1114 1115 migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); 1116 1117 s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 1118 return s; 1119 } 1120 1121 static GSList *migration_blockers; 1122 1123 int migrate_add_blocker(Error *reason, Error **errp) 1124 { 1125 if (only_migratable) { 1126 error_propagate(errp, error_copy(reason)); 1127 error_prepend(errp, "disallowing migration blocker " 1128 "(--only_migratable) for: "); 1129 return -EACCES; 1130 } 1131 1132 if (migration_is_idle()) { 1133 migration_blockers = g_slist_prepend(migration_blockers, reason); 1134 return 0; 1135 } 1136 1137 error_propagate(errp, error_copy(reason)); 1138 error_prepend(errp, "disallowing migration blocker (migration in " 1139 "progress) for: "); 1140 return -EBUSY; 1141 } 1142 1143 void migrate_del_blocker(Error *reason) 1144 { 1145 migration_blockers = g_slist_remove(migration_blockers, reason); 1146 } 1147 1148 void qmp_migrate_incoming(const char *uri, Error **errp) 1149 { 1150 Error *local_err = NULL; 1151 static bool once = true; 1152 1153 if (!deferred_incoming) { 1154 error_setg(errp, "For use with '-incoming defer'"); 1155 return; 1156 } 1157 if (!once) { 1158 error_setg(errp, "The incoming migration has already been started"); 1159 } 1160 1161 qemu_start_incoming_migration(uri, &local_err); 1162 1163 if (local_err) { 1164 error_propagate(errp, local_err); 1165 return; 1166 } 1167 1168 once = false; 1169 } 1170 1171 bool migration_is_blocked(Error **errp) 1172 { 1173 if (qemu_savevm_state_blocked(errp)) { 1174 return true; 1175 } 1176 1177 if (migration_blockers) { 1178 *errp = error_copy(migration_blockers->data); 1179 return true; 1180 } 1181 1182 return false; 1183 } 1184 1185 void qmp_migrate(const char *uri, bool has_blk, bool blk, 1186 bool has_inc, bool inc, bool has_detach, bool detach, 1187 Error **errp) 1188 { 1189 Error *local_err = NULL; 1190 MigrationState *s = migrate_get_current(); 1191 const char *p; 1192 1193 if (migration_is_setup_or_active(s->state) || 1194 s->state == MIGRATION_STATUS_CANCELLING || 1195 s->state == MIGRATION_STATUS_COLO) { 1196 error_setg(errp, QERR_MIGRATION_ACTIVE); 1197 return; 1198 } 1199 if (runstate_check(RUN_STATE_INMIGRATE)) { 1200 error_setg(errp, "Guest is waiting for an incoming migration"); 1201 return; 1202 } 1203 1204 if (migration_is_blocked(errp)) { 1205 return; 1206 } 1207 1208 if ((has_blk && blk) || (has_inc && inc)) { 1209 if (migrate_use_block() || migrate_use_block_incremental()) { 1210 error_setg(errp, "Command options are incompatible with " 1211 "current migration capabilities"); 1212 return; 1213 } 1214 migrate_set_block_enabled(true, &local_err); 1215 if (local_err) { 1216 error_propagate(errp, local_err); 1217 return; 1218 } 1219 s->must_remove_block_options = true; 1220 } 1221 1222 if (has_inc && inc) { 1223 migrate_set_block_incremental(s, true); 1224 } 1225 1226 s = migrate_init(); 1227 1228 if (strstart(uri, "tcp:", &p)) { 1229 tcp_start_outgoing_migration(s, p, &local_err); 1230 #ifdef CONFIG_RDMA 1231 } else if (strstart(uri, "rdma:", &p)) { 1232 rdma_start_outgoing_migration(s, p, &local_err); 1233 #endif 1234 } else if (strstart(uri, "exec:", &p)) { 1235 exec_start_outgoing_migration(s, p, &local_err); 1236 } else if (strstart(uri, "unix:", &p)) { 1237 unix_start_outgoing_migration(s, p, &local_err); 1238 } else if (strstart(uri, "fd:", &p)) { 1239 fd_start_outgoing_migration(s, p, &local_err); 1240 } else { 1241 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri", 1242 "a valid migration protocol"); 1243 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 1244 MIGRATION_STATUS_FAILED); 1245 return; 1246 } 1247 1248 if (local_err) { 1249 migrate_fd_error(s, local_err); 1250 error_propagate(errp, local_err); 1251 return; 1252 } 1253 } 1254 1255 void qmp_migrate_cancel(Error **errp) 1256 { 1257 migrate_fd_cancel(migrate_get_current()); 1258 } 1259 1260 void qmp_migrate_set_cache_size(int64_t value, Error **errp) 1261 { 1262 MigrationState *s = migrate_get_current(); 1263 int64_t new_size; 1264 1265 /* Check for truncation */ 1266 if (value != (size_t)value) { 1267 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", 1268 "exceeding address space"); 1269 return; 1270 } 1271 1272 /* Cache should not be larger than guest ram size */ 1273 if (value > ram_bytes_total()) { 1274 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", 1275 "exceeds guest ram size "); 1276 return; 1277 } 1278 1279 new_size = xbzrle_cache_resize(value); 1280 if (new_size < 0) { 1281 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", 1282 "is smaller than page size"); 1283 return; 1284 } 1285 1286 s->xbzrle_cache_size = new_size; 1287 } 1288 1289 int64_t qmp_query_migrate_cache_size(Error **errp) 1290 { 1291 return migrate_xbzrle_cache_size(); 1292 } 1293 1294 void qmp_migrate_set_speed(int64_t value, Error **errp) 1295 { 1296 MigrationParameters p = { 1297 .has_max_bandwidth = true, 1298 .max_bandwidth = value, 1299 }; 1300 1301 qmp_migrate_set_parameters(&p, errp); 1302 } 1303 1304 void qmp_migrate_set_downtime(double value, Error **errp) 1305 { 1306 if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) { 1307 error_setg(errp, "Parameter 'downtime_limit' expects an integer in " 1308 "the range of 0 to %d seconds", 1309 MAX_MIGRATE_DOWNTIME_SECONDS); 1310 return; 1311 } 1312 1313 value *= 1000; /* Convert to milliseconds */ 1314 value = MAX(0, MIN(INT64_MAX, value)); 1315 1316 MigrationParameters p = { 1317 .has_downtime_limit = true, 1318 .downtime_limit = value, 1319 }; 1320 1321 qmp_migrate_set_parameters(&p, errp); 1322 } 1323 1324 bool migrate_release_ram(void) 1325 { 1326 MigrationState *s; 1327 1328 s = migrate_get_current(); 1329 1330 return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM]; 1331 } 1332 1333 bool migrate_postcopy_ram(void) 1334 { 1335 MigrationState *s; 1336 1337 s = migrate_get_current(); 1338 1339 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM]; 1340 } 1341 1342 bool migrate_auto_converge(void) 1343 { 1344 MigrationState *s; 1345 1346 s = migrate_get_current(); 1347 1348 return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; 1349 } 1350 1351 bool migrate_zero_blocks(void) 1352 { 1353 MigrationState *s; 1354 1355 s = migrate_get_current(); 1356 1357 return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; 1358 } 1359 1360 bool migrate_use_compression(void) 1361 { 1362 MigrationState *s; 1363 1364 s = migrate_get_current(); 1365 1366 return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS]; 1367 } 1368 1369 int migrate_compress_level(void) 1370 { 1371 MigrationState *s; 1372 1373 s = migrate_get_current(); 1374 1375 return s->parameters.compress_level; 1376 } 1377 1378 int migrate_compress_threads(void) 1379 { 1380 MigrationState *s; 1381 1382 s = migrate_get_current(); 1383 1384 return s->parameters.compress_threads; 1385 } 1386 1387 int migrate_decompress_threads(void) 1388 { 1389 MigrationState *s; 1390 1391 s = migrate_get_current(); 1392 1393 return s->parameters.decompress_threads; 1394 } 1395 1396 bool migrate_use_events(void) 1397 { 1398 MigrationState *s; 1399 1400 s = migrate_get_current(); 1401 1402 return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS]; 1403 } 1404 1405 int migrate_use_xbzrle(void) 1406 { 1407 MigrationState *s; 1408 1409 s = migrate_get_current(); 1410 1411 return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; 1412 } 1413 1414 int64_t migrate_xbzrle_cache_size(void) 1415 { 1416 MigrationState *s; 1417 1418 s = migrate_get_current(); 1419 1420 return s->xbzrle_cache_size; 1421 } 1422 1423 bool migrate_use_block(void) 1424 { 1425 MigrationState *s; 1426 1427 s = migrate_get_current(); 1428 1429 return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK]; 1430 } 1431 1432 bool migrate_use_block_incremental(void) 1433 { 1434 MigrationState *s; 1435 1436 s = migrate_get_current(); 1437 1438 return s->parameters.block_incremental; 1439 } 1440 1441 /* migration thread support */ 1442 /* 1443 * Something bad happened to the RP stream, mark an error 1444 * The caller shall print or trace something to indicate why 1445 */ 1446 static void mark_source_rp_bad(MigrationState *s) 1447 { 1448 s->rp_state.error = true; 1449 } 1450 1451 static struct rp_cmd_args { 1452 ssize_t len; /* -1 = variable */ 1453 const char *name; 1454 } rp_cmd_args[] = { 1455 [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, 1456 [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, 1457 [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, 1458 [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" }, 1459 [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" }, 1460 [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, 1461 }; 1462 1463 /* 1464 * Process a request for pages received on the return path, 1465 * We're allowed to send more than requested (e.g. to round to our page size) 1466 * and we don't need to send pages that have already been sent. 1467 */ 1468 static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname, 1469 ram_addr_t start, size_t len) 1470 { 1471 long our_host_ps = getpagesize(); 1472 1473 trace_migrate_handle_rp_req_pages(rbname, start, len); 1474 1475 /* 1476 * Since we currently insist on matching page sizes, just sanity check 1477 * we're being asked for whole host pages. 1478 */ 1479 if (start & (our_host_ps-1) || 1480 (len & (our_host_ps-1))) { 1481 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT 1482 " len: %zd", __func__, start, len); 1483 mark_source_rp_bad(ms); 1484 return; 1485 } 1486 1487 if (ram_save_queue_pages(rbname, start, len)) { 1488 mark_source_rp_bad(ms); 1489 } 1490 } 1491 1492 /* 1493 * Handles messages sent on the return path towards the source VM 1494 * 1495 */ 1496 static void *source_return_path_thread(void *opaque) 1497 { 1498 MigrationState *ms = opaque; 1499 QEMUFile *rp = ms->rp_state.from_dst_file; 1500 uint16_t header_len, header_type; 1501 uint8_t buf[512]; 1502 uint32_t tmp32, sibling_error; 1503 ram_addr_t start = 0; /* =0 to silence warning */ 1504 size_t len = 0, expected_len; 1505 int res; 1506 1507 trace_source_return_path_thread_entry(); 1508 while (!ms->rp_state.error && !qemu_file_get_error(rp) && 1509 migration_is_setup_or_active(ms->state)) { 1510 trace_source_return_path_thread_loop_top(); 1511 header_type = qemu_get_be16(rp); 1512 header_len = qemu_get_be16(rp); 1513 1514 if (header_type >= MIG_RP_MSG_MAX || 1515 header_type == MIG_RP_MSG_INVALID) { 1516 error_report("RP: Received invalid message 0x%04x length 0x%04x", 1517 header_type, header_len); 1518 mark_source_rp_bad(ms); 1519 goto out; 1520 } 1521 1522 if ((rp_cmd_args[header_type].len != -1 && 1523 header_len != rp_cmd_args[header_type].len) || 1524 header_len > sizeof(buf)) { 1525 error_report("RP: Received '%s' message (0x%04x) with" 1526 "incorrect length %d expecting %zu", 1527 rp_cmd_args[header_type].name, header_type, header_len, 1528 (size_t)rp_cmd_args[header_type].len); 1529 mark_source_rp_bad(ms); 1530 goto out; 1531 } 1532 1533 /* We know we've got a valid header by this point */ 1534 res = qemu_get_buffer(rp, buf, header_len); 1535 if (res != header_len) { 1536 error_report("RP: Failed reading data for message 0x%04x" 1537 " read %d expected %d", 1538 header_type, res, header_len); 1539 mark_source_rp_bad(ms); 1540 goto out; 1541 } 1542 1543 /* OK, we have the message and the data */ 1544 switch (header_type) { 1545 case MIG_RP_MSG_SHUT: 1546 sibling_error = ldl_be_p(buf); 1547 trace_source_return_path_thread_shut(sibling_error); 1548 if (sibling_error) { 1549 error_report("RP: Sibling indicated error %d", sibling_error); 1550 mark_source_rp_bad(ms); 1551 } 1552 /* 1553 * We'll let the main thread deal with closing the RP 1554 * we could do a shutdown(2) on it, but we're the only user 1555 * anyway, so there's nothing gained. 1556 */ 1557 goto out; 1558 1559 case MIG_RP_MSG_PONG: 1560 tmp32 = ldl_be_p(buf); 1561 trace_source_return_path_thread_pong(tmp32); 1562 break; 1563 1564 case MIG_RP_MSG_REQ_PAGES: 1565 start = ldq_be_p(buf); 1566 len = ldl_be_p(buf + 8); 1567 migrate_handle_rp_req_pages(ms, NULL, start, len); 1568 break; 1569 1570 case MIG_RP_MSG_REQ_PAGES_ID: 1571 expected_len = 12 + 1; /* header + termination */ 1572 1573 if (header_len >= expected_len) { 1574 start = ldq_be_p(buf); 1575 len = ldl_be_p(buf + 8); 1576 /* Now we expect an idstr */ 1577 tmp32 = buf[12]; /* Length of the following idstr */ 1578 buf[13 + tmp32] = '\0'; 1579 expected_len += tmp32; 1580 } 1581 if (header_len != expected_len) { 1582 error_report("RP: Req_Page_id with length %d expecting %zd", 1583 header_len, expected_len); 1584 mark_source_rp_bad(ms); 1585 goto out; 1586 } 1587 migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len); 1588 break; 1589 1590 default: 1591 break; 1592 } 1593 } 1594 if (qemu_file_get_error(rp)) { 1595 trace_source_return_path_thread_bad_end(); 1596 mark_source_rp_bad(ms); 1597 } 1598 1599 trace_source_return_path_thread_end(); 1600 out: 1601 ms->rp_state.from_dst_file = NULL; 1602 qemu_fclose(rp); 1603 return NULL; 1604 } 1605 1606 static int open_return_path_on_source(MigrationState *ms) 1607 { 1608 1609 ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file); 1610 if (!ms->rp_state.from_dst_file) { 1611 return -1; 1612 } 1613 1614 trace_open_return_path_on_source(); 1615 qemu_thread_create(&ms->rp_state.rp_thread, "return path", 1616 source_return_path_thread, ms, QEMU_THREAD_JOINABLE); 1617 1618 trace_open_return_path_on_source_continue(); 1619 1620 return 0; 1621 } 1622 1623 /* Returns 0 if the RP was ok, otherwise there was an error on the RP */ 1624 static int await_return_path_close_on_source(MigrationState *ms) 1625 { 1626 /* 1627 * If this is a normal exit then the destination will send a SHUT and the 1628 * rp_thread will exit, however if there's an error we need to cause 1629 * it to exit. 1630 */ 1631 if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) { 1632 /* 1633 * shutdown(2), if we have it, will cause it to unblock if it's stuck 1634 * waiting for the destination. 1635 */ 1636 qemu_file_shutdown(ms->rp_state.from_dst_file); 1637 mark_source_rp_bad(ms); 1638 } 1639 trace_await_return_path_close_on_source_joining(); 1640 qemu_thread_join(&ms->rp_state.rp_thread); 1641 trace_await_return_path_close_on_source_close(); 1642 return ms->rp_state.error; 1643 } 1644 1645 /* 1646 * Switch from normal iteration to postcopy 1647 * Returns non-0 on error 1648 */ 1649 static int postcopy_start(MigrationState *ms, bool *old_vm_running) 1650 { 1651 int ret; 1652 QIOChannelBuffer *bioc; 1653 QEMUFile *fb; 1654 int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 1655 bool restart_block = false; 1656 migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, 1657 MIGRATION_STATUS_POSTCOPY_ACTIVE); 1658 1659 trace_postcopy_start(); 1660 qemu_mutex_lock_iothread(); 1661 trace_postcopy_start_set_run(); 1662 1663 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); 1664 *old_vm_running = runstate_is_running(); 1665 global_state_store(); 1666 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); 1667 if (ret < 0) { 1668 goto fail; 1669 } 1670 1671 ret = bdrv_inactivate_all(); 1672 if (ret < 0) { 1673 goto fail; 1674 } 1675 restart_block = true; 1676 1677 /* 1678 * Cause any non-postcopiable, but iterative devices to 1679 * send out their final data. 1680 */ 1681 qemu_savevm_state_complete_precopy(ms->to_dst_file, true); 1682 1683 /* 1684 * in Finish migrate and with the io-lock held everything should 1685 * be quiet, but we've potentially still got dirty pages and we 1686 * need to tell the destination to throw any pages it's already received 1687 * that are dirty 1688 */ 1689 if (ram_postcopy_send_discard_bitmap(ms)) { 1690 error_report("postcopy send discard bitmap failed"); 1691 goto fail; 1692 } 1693 1694 /* 1695 * send rest of state - note things that are doing postcopy 1696 * will notice we're in POSTCOPY_ACTIVE and not actually 1697 * wrap their state up here 1698 */ 1699 qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX); 1700 /* Ping just for debugging, helps line traces up */ 1701 qemu_savevm_send_ping(ms->to_dst_file, 2); 1702 1703 /* 1704 * While loading the device state we may trigger page transfer 1705 * requests and the fd must be free to process those, and thus 1706 * the destination must read the whole device state off the fd before 1707 * it starts processing it. Unfortunately the ad-hoc migration format 1708 * doesn't allow the destination to know the size to read without fully 1709 * parsing it through each devices load-state code (especially the open 1710 * coded devices that use get/put). 1711 * So we wrap the device state up in a package with a length at the start; 1712 * to do this we use a qemu_buf to hold the whole of the device state. 1713 */ 1714 bioc = qio_channel_buffer_new(4096); 1715 qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer"); 1716 fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc)); 1717 object_unref(OBJECT(bioc)); 1718 1719 /* 1720 * Make sure the receiver can get incoming pages before we send the rest 1721 * of the state 1722 */ 1723 qemu_savevm_send_postcopy_listen(fb); 1724 1725 qemu_savevm_state_complete_precopy(fb, false); 1726 qemu_savevm_send_ping(fb, 3); 1727 1728 qemu_savevm_send_postcopy_run(fb); 1729 1730 /* <><> end of stuff going into the package */ 1731 1732 /* Last point of recovery; as soon as we send the package the destination 1733 * can open devices and potentially start running. 1734 * Lets just check again we've not got any errors. 1735 */ 1736 ret = qemu_file_get_error(ms->to_dst_file); 1737 if (ret) { 1738 error_report("postcopy_start: Migration stream errored (pre package)"); 1739 goto fail_closefb; 1740 } 1741 1742 restart_block = false; 1743 1744 /* Now send that blob */ 1745 if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) { 1746 goto fail_closefb; 1747 } 1748 qemu_fclose(fb); 1749 1750 /* Send a notify to give a chance for anything that needs to happen 1751 * at the transition to postcopy and after the device state; in particular 1752 * spice needs to trigger a transition now 1753 */ 1754 ms->postcopy_after_devices = true; 1755 notifier_list_notify(&migration_state_notifiers, ms); 1756 1757 ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop; 1758 1759 qemu_mutex_unlock_iothread(); 1760 1761 /* 1762 * Although this ping is just for debug, it could potentially be 1763 * used for getting a better measurement of downtime at the source. 1764 */ 1765 qemu_savevm_send_ping(ms->to_dst_file, 4); 1766 1767 if (migrate_release_ram()) { 1768 ram_postcopy_migrated_memory_release(ms); 1769 } 1770 1771 ret = qemu_file_get_error(ms->to_dst_file); 1772 if (ret) { 1773 error_report("postcopy_start: Migration stream errored"); 1774 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, 1775 MIGRATION_STATUS_FAILED); 1776 } 1777 1778 return ret; 1779 1780 fail_closefb: 1781 qemu_fclose(fb); 1782 fail: 1783 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, 1784 MIGRATION_STATUS_FAILED); 1785 if (restart_block) { 1786 /* A failure happened early enough that we know the destination hasn't 1787 * accessed block devices, so we're safe to recover. 1788 */ 1789 Error *local_err = NULL; 1790 1791 bdrv_invalidate_cache_all(&local_err); 1792 if (local_err) { 1793 error_report_err(local_err); 1794 } 1795 } 1796 qemu_mutex_unlock_iothread(); 1797 return -1; 1798 } 1799 1800 /** 1801 * migration_completion: Used by migration_thread when there's not much left. 1802 * The caller 'breaks' the loop when this returns. 1803 * 1804 * @s: Current migration state 1805 * @current_active_state: The migration state we expect to be in 1806 * @*old_vm_running: Pointer to old_vm_running flag 1807 * @*start_time: Pointer to time to update 1808 */ 1809 static void migration_completion(MigrationState *s, int current_active_state, 1810 bool *old_vm_running, 1811 int64_t *start_time) 1812 { 1813 int ret; 1814 1815 if (s->state == MIGRATION_STATUS_ACTIVE) { 1816 qemu_mutex_lock_iothread(); 1817 *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 1818 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); 1819 *old_vm_running = runstate_is_running(); 1820 ret = global_state_store(); 1821 1822 if (!ret) { 1823 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); 1824 /* 1825 * Don't mark the image with BDRV_O_INACTIVE flag if 1826 * we will go into COLO stage later. 1827 */ 1828 if (ret >= 0 && !migrate_colo_enabled()) { 1829 ret = bdrv_inactivate_all(); 1830 } 1831 if (ret >= 0) { 1832 qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); 1833 qemu_savevm_state_complete_precopy(s->to_dst_file, false); 1834 s->block_inactive = true; 1835 } 1836 } 1837 qemu_mutex_unlock_iothread(); 1838 1839 if (ret < 0) { 1840 goto fail; 1841 } 1842 } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { 1843 trace_migration_completion_postcopy_end(); 1844 1845 qemu_savevm_state_complete_postcopy(s->to_dst_file); 1846 trace_migration_completion_postcopy_end_after_complete(); 1847 } 1848 1849 /* 1850 * If rp was opened we must clean up the thread before 1851 * cleaning everything else up (since if there are no failures 1852 * it will wait for the destination to send it's status in 1853 * a SHUT command). 1854 * Postcopy opens rp if enabled (even if it's not avtivated) 1855 */ 1856 if (migrate_postcopy_ram()) { 1857 int rp_error; 1858 trace_migration_completion_postcopy_end_before_rp(); 1859 rp_error = await_return_path_close_on_source(s); 1860 trace_migration_completion_postcopy_end_after_rp(rp_error); 1861 if (rp_error) { 1862 goto fail_invalidate; 1863 } 1864 } 1865 1866 if (qemu_file_get_error(s->to_dst_file)) { 1867 trace_migration_completion_file_err(); 1868 goto fail_invalidate; 1869 } 1870 1871 if (!migrate_colo_enabled()) { 1872 migrate_set_state(&s->state, current_active_state, 1873 MIGRATION_STATUS_COMPLETED); 1874 } 1875 1876 return; 1877 1878 fail_invalidate: 1879 /* If not doing postcopy, vm_start() will be called: let's regain 1880 * control on images. 1881 */ 1882 if (s->state == MIGRATION_STATUS_ACTIVE) { 1883 Error *local_err = NULL; 1884 1885 qemu_mutex_lock_iothread(); 1886 bdrv_invalidate_cache_all(&local_err); 1887 if (local_err) { 1888 error_report_err(local_err); 1889 } else { 1890 s->block_inactive = false; 1891 } 1892 qemu_mutex_unlock_iothread(); 1893 } 1894 1895 fail: 1896 migrate_set_state(&s->state, current_active_state, 1897 MIGRATION_STATUS_FAILED); 1898 } 1899 1900 bool migrate_colo_enabled(void) 1901 { 1902 MigrationState *s = migrate_get_current(); 1903 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO]; 1904 } 1905 1906 /* 1907 * Master migration thread on the source VM. 1908 * It drives the migration and pumps the data down the outgoing channel. 1909 */ 1910 static void *migration_thread(void *opaque) 1911 { 1912 MigrationState *s = opaque; 1913 /* Used by the bandwidth calcs, updated later */ 1914 int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 1915 int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); 1916 int64_t initial_bytes = 0; 1917 /* 1918 * The final stage happens when the remaining data is smaller than 1919 * this threshold; it's calculated from the requested downtime and 1920 * measured bandwidth 1921 */ 1922 int64_t threshold_size = 0; 1923 int64_t start_time = initial_time; 1924 int64_t end_time; 1925 bool old_vm_running = false; 1926 bool entered_postcopy = false; 1927 /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */ 1928 enum MigrationStatus current_active_state = MIGRATION_STATUS_ACTIVE; 1929 bool enable_colo = migrate_colo_enabled(); 1930 1931 rcu_register_thread(); 1932 1933 qemu_savevm_state_header(s->to_dst_file); 1934 1935 if (migrate_postcopy_ram()) { 1936 /* Now tell the dest that it should open its end so it can reply */ 1937 qemu_savevm_send_open_return_path(s->to_dst_file); 1938 1939 /* And do a ping that will make stuff easier to debug */ 1940 qemu_savevm_send_ping(s->to_dst_file, 1); 1941 1942 /* 1943 * Tell the destination that we *might* want to do postcopy later; 1944 * if the other end can't do postcopy it should fail now, nice and 1945 * early. 1946 */ 1947 qemu_savevm_send_postcopy_advise(s->to_dst_file); 1948 } 1949 1950 qemu_savevm_state_begin(s->to_dst_file); 1951 1952 s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; 1953 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 1954 MIGRATION_STATUS_ACTIVE); 1955 1956 trace_migration_thread_setup_complete(); 1957 1958 while (s->state == MIGRATION_STATUS_ACTIVE || 1959 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { 1960 int64_t current_time; 1961 uint64_t pending_size; 1962 1963 if (!qemu_file_rate_limit(s->to_dst_file)) { 1964 uint64_t pend_post, pend_nonpost; 1965 1966 qemu_savevm_state_pending(s->to_dst_file, threshold_size, 1967 &pend_nonpost, &pend_post); 1968 pending_size = pend_nonpost + pend_post; 1969 trace_migrate_pending(pending_size, threshold_size, 1970 pend_post, pend_nonpost); 1971 if (pending_size && pending_size >= threshold_size) { 1972 /* Still a significant amount to transfer */ 1973 1974 if (migrate_postcopy_ram() && 1975 s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE && 1976 pend_nonpost <= threshold_size && 1977 atomic_read(&s->start_postcopy)) { 1978 1979 if (!postcopy_start(s, &old_vm_running)) { 1980 current_active_state = MIGRATION_STATUS_POSTCOPY_ACTIVE; 1981 entered_postcopy = true; 1982 } 1983 1984 continue; 1985 } 1986 /* Just another iteration step */ 1987 qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy); 1988 } else { 1989 trace_migration_thread_low_pending(pending_size); 1990 migration_completion(s, current_active_state, 1991 &old_vm_running, &start_time); 1992 break; 1993 } 1994 } 1995 1996 if (qemu_file_get_error(s->to_dst_file)) { 1997 migrate_set_state(&s->state, current_active_state, 1998 MIGRATION_STATUS_FAILED); 1999 trace_migration_thread_file_err(); 2000 break; 2001 } 2002 current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 2003 if (current_time >= initial_time + BUFFER_DELAY) { 2004 uint64_t transferred_bytes = qemu_ftell(s->to_dst_file) - 2005 initial_bytes; 2006 uint64_t time_spent = current_time - initial_time; 2007 double bandwidth = (double)transferred_bytes / time_spent; 2008 threshold_size = bandwidth * s->parameters.downtime_limit; 2009 2010 s->mbps = (((double) transferred_bytes * 8.0) / 2011 ((double) time_spent / 1000.0)) / 1000.0 / 1000.0; 2012 2013 trace_migrate_transferred(transferred_bytes, time_spent, 2014 bandwidth, threshold_size); 2015 /* if we haven't sent anything, we don't want to recalculate 2016 10000 is a small enough number for our purposes */ 2017 if (ram_dirty_pages_rate() && transferred_bytes > 10000) { 2018 s->expected_downtime = ram_dirty_pages_rate() * 2019 qemu_target_page_size() / bandwidth; 2020 } 2021 2022 qemu_file_reset_rate_limit(s->to_dst_file); 2023 initial_time = current_time; 2024 initial_bytes = qemu_ftell(s->to_dst_file); 2025 } 2026 if (qemu_file_rate_limit(s->to_dst_file)) { 2027 /* usleep expects microseconds */ 2028 g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); 2029 } 2030 } 2031 2032 trace_migration_thread_after_loop(); 2033 /* If we enabled cpu throttling for auto-converge, turn it off. */ 2034 cpu_throttle_stop(); 2035 end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 2036 2037 qemu_mutex_lock_iothread(); 2038 /* 2039 * The resource has been allocated by migration will be reused in COLO 2040 * process, so don't release them. 2041 */ 2042 if (!enable_colo) { 2043 qemu_savevm_state_cleanup(); 2044 } 2045 if (s->state == MIGRATION_STATUS_COMPLETED) { 2046 uint64_t transferred_bytes = qemu_ftell(s->to_dst_file); 2047 s->total_time = end_time - s->total_time; 2048 if (!entered_postcopy) { 2049 s->downtime = end_time - start_time; 2050 } 2051 if (s->total_time) { 2052 s->mbps = (((double) transferred_bytes * 8.0) / 2053 ((double) s->total_time)) / 1000; 2054 } 2055 runstate_set(RUN_STATE_POSTMIGRATE); 2056 } else { 2057 if (s->state == MIGRATION_STATUS_ACTIVE && enable_colo) { 2058 migrate_start_colo_process(s); 2059 qemu_savevm_state_cleanup(); 2060 /* 2061 * Fixme: we will run VM in COLO no matter its old running state. 2062 * After exited COLO, we will keep running. 2063 */ 2064 old_vm_running = true; 2065 } 2066 if (old_vm_running && !entered_postcopy) { 2067 vm_start(); 2068 } else { 2069 if (runstate_check(RUN_STATE_FINISH_MIGRATE)) { 2070 runstate_set(RUN_STATE_POSTMIGRATE); 2071 } 2072 } 2073 } 2074 qemu_bh_schedule(s->cleanup_bh); 2075 qemu_mutex_unlock_iothread(); 2076 2077 rcu_unregister_thread(); 2078 return NULL; 2079 } 2080 2081 void migrate_fd_connect(MigrationState *s) 2082 { 2083 s->expected_downtime = s->parameters.downtime_limit; 2084 s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); 2085 2086 qemu_file_set_blocking(s->to_dst_file, true); 2087 qemu_file_set_rate_limit(s->to_dst_file, 2088 s->parameters.max_bandwidth / XFER_LIMIT_RATIO); 2089 2090 /* Notify before starting migration thread */ 2091 notifier_list_notify(&migration_state_notifiers, s); 2092 2093 /* 2094 * Open the return path; currently for postcopy but other things might 2095 * also want it. 2096 */ 2097 if (migrate_postcopy_ram()) { 2098 if (open_return_path_on_source(s)) { 2099 error_report("Unable to open return-path for postcopy"); 2100 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 2101 MIGRATION_STATUS_FAILED); 2102 migrate_fd_cleanup(s); 2103 return; 2104 } 2105 } 2106 2107 migrate_compress_threads_create(); 2108 qemu_thread_create(&s->thread, "live_migration", migration_thread, s, 2109 QEMU_THREAD_JOINABLE); 2110 s->migration_thread_running = true; 2111 } 2112 2113