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 "migration/blocker.h" 20 #include "exec.h" 21 #include "fd.h" 22 #include "socket.h" 23 #include "rdma.h" 24 #include "ram.h" 25 #include "migration/global_state.h" 26 #include "migration/misc.h" 27 #include "migration.h" 28 #include "savevm.h" 29 #include "qemu-file-channel.h" 30 #include "qemu-file.h" 31 #include "migration/vmstate.h" 32 #include "block/block.h" 33 #include "qapi/qmp/qerror.h" 34 #include "qapi/util.h" 35 #include "qemu/rcu.h" 36 #include "block.h" 37 #include "postcopy-ram.h" 38 #include "qemu/thread.h" 39 #include "qmp-commands.h" 40 #include "trace.h" 41 #include "qapi-event.h" 42 #include "exec/target_page.h" 43 #include "io/channel-buffer.h" 44 #include "migration/colo.h" 45 #include "hw/boards.h" 46 #include "monitor/monitor.h" 47 48 #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ 49 50 /* Amount of time to allocate to each "chunk" of bandwidth-throttled 51 * data. */ 52 #define BUFFER_DELAY 100 53 #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) 54 55 /* Time in milliseconds we are allowed to stop the source, 56 * for sending the last part */ 57 #define DEFAULT_MIGRATE_SET_DOWNTIME 300 58 59 /* Maximum migrate downtime set to 2000 seconds */ 60 #define MAX_MIGRATE_DOWNTIME_SECONDS 2000 61 #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000) 62 63 /* Default compression thread count */ 64 #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 65 /* Default decompression thread count, usually decompression is at 66 * least 4 times as fast as compression.*/ 67 #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 68 /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ 69 #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 70 /* Define default autoconverge cpu throttle migration parameters */ 71 #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20 72 #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10 73 74 /* Migration XBZRLE default cache size */ 75 #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) 76 77 /* The delay time (in ms) between two COLO checkpoints 78 * Note: Please change this default value to 10000 when we support hybrid mode. 79 */ 80 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200 81 82 static NotifierList migration_state_notifiers = 83 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); 84 85 static bool deferred_incoming; 86 87 /* Messages sent on the return path from destination to source */ 88 enum mig_rp_message_type { 89 MIG_RP_MSG_INVALID = 0, /* Must be 0 */ 90 MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */ 91 MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */ 92 93 MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */ 94 MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */ 95 96 MIG_RP_MSG_MAX 97 }; 98 99 /* When we add fault tolerance, we could have several 100 migrations at once. For now we don't need to add 101 dynamic creation of migration */ 102 103 static MigrationState *current_migration; 104 105 void migration_object_init(void) 106 { 107 MachineState *ms = MACHINE(qdev_get_machine()); 108 109 /* This can only be called once. */ 110 assert(!current_migration); 111 current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION)); 112 113 /* 114 * We cannot really do this in migration_instance_init() since at 115 * that time global properties are not yet applied, then this 116 * value will be definitely replaced by something else. 117 */ 118 if (ms->enforce_config_section) { 119 current_migration->send_configuration = true; 120 } 121 } 122 123 /* For outgoing */ 124 MigrationState *migrate_get_current(void) 125 { 126 /* This can only be called after the object created. */ 127 assert(current_migration); 128 return current_migration; 129 } 130 131 MigrationIncomingState *migration_incoming_get_current(void) 132 { 133 static bool once; 134 static MigrationIncomingState mis_current; 135 136 if (!once) { 137 mis_current.state = MIGRATION_STATUS_NONE; 138 memset(&mis_current, 0, sizeof(MigrationIncomingState)); 139 qemu_mutex_init(&mis_current.rp_mutex); 140 qemu_event_init(&mis_current.main_thread_load_event, false); 141 once = true; 142 } 143 return &mis_current; 144 } 145 146 void migration_incoming_state_destroy(void) 147 { 148 struct MigrationIncomingState *mis = migration_incoming_get_current(); 149 150 if (mis->to_src_file) { 151 /* Tell source that we are done */ 152 migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0); 153 qemu_fclose(mis->to_src_file); 154 mis->to_src_file = NULL; 155 } 156 157 if (mis->from_src_file) { 158 qemu_fclose(mis->from_src_file); 159 mis->from_src_file = NULL; 160 } 161 162 qemu_event_destroy(&mis->main_thread_load_event); 163 } 164 165 static void migrate_generate_event(int new_state) 166 { 167 if (migrate_use_events()) { 168 qapi_event_send_migration(new_state, &error_abort); 169 } 170 } 171 172 /* 173 * Called on -incoming with a defer: uri. 174 * The migration can be started later after any parameters have been 175 * changed. 176 */ 177 static void deferred_incoming_migration(Error **errp) 178 { 179 if (deferred_incoming) { 180 error_setg(errp, "Incoming migration already deferred"); 181 } 182 deferred_incoming = true; 183 } 184 185 /* 186 * Send a message on the return channel back to the source 187 * of the migration. 188 */ 189 static void migrate_send_rp_message(MigrationIncomingState *mis, 190 enum mig_rp_message_type message_type, 191 uint16_t len, void *data) 192 { 193 trace_migrate_send_rp_message((int)message_type, len); 194 qemu_mutex_lock(&mis->rp_mutex); 195 qemu_put_be16(mis->to_src_file, (unsigned int)message_type); 196 qemu_put_be16(mis->to_src_file, len); 197 qemu_put_buffer(mis->to_src_file, data, len); 198 qemu_fflush(mis->to_src_file); 199 qemu_mutex_unlock(&mis->rp_mutex); 200 } 201 202 /* Request a range of pages from the source VM at the given 203 * start address. 204 * rbname: Name of the RAMBlock to request the page in, if NULL it's the same 205 * as the last request (a name must have been given previously) 206 * Start: Address offset within the RB 207 * Len: Length in bytes required - must be a multiple of pagesize 208 */ 209 void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname, 210 ram_addr_t start, size_t len) 211 { 212 uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ 213 size_t msglen = 12; /* start + len */ 214 215 *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); 216 *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); 217 218 if (rbname) { 219 int rbname_len = strlen(rbname); 220 assert(rbname_len < 256); 221 222 bufc[msglen++] = rbname_len; 223 memcpy(bufc + msglen, rbname, rbname_len); 224 msglen += rbname_len; 225 migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES_ID, msglen, bufc); 226 } else { 227 migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES, msglen, bufc); 228 } 229 } 230 231 void qemu_start_incoming_migration(const char *uri, Error **errp) 232 { 233 const char *p; 234 235 qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort); 236 if (!strcmp(uri, "defer")) { 237 deferred_incoming_migration(errp); 238 } else if (strstart(uri, "tcp:", &p)) { 239 tcp_start_incoming_migration(p, errp); 240 #ifdef CONFIG_RDMA 241 } else if (strstart(uri, "rdma:", &p)) { 242 rdma_start_incoming_migration(p, errp); 243 #endif 244 } else if (strstart(uri, "exec:", &p)) { 245 exec_start_incoming_migration(p, errp); 246 } else if (strstart(uri, "unix:", &p)) { 247 unix_start_incoming_migration(p, errp); 248 } else if (strstart(uri, "fd:", &p)) { 249 fd_start_incoming_migration(p, errp); 250 } else { 251 error_setg(errp, "unknown migration protocol: %s", uri); 252 } 253 } 254 255 static void process_incoming_migration_bh(void *opaque) 256 { 257 Error *local_err = NULL; 258 MigrationIncomingState *mis = opaque; 259 260 /* Make sure all file formats flush their mutable metadata. 261 * If we get an error here, just don't restart the VM yet. */ 262 bdrv_invalidate_cache_all(&local_err); 263 if (local_err) { 264 error_report_err(local_err); 265 local_err = NULL; 266 autostart = false; 267 } 268 269 /* 270 * This must happen after all error conditions are dealt with and 271 * we're sure the VM is going to be running on this host. 272 */ 273 qemu_announce_self(); 274 275 /* If global state section was not received or we are in running 276 state, we need to obey autostart. Any other state is set with 277 runstate_set. */ 278 279 if (!global_state_received() || 280 global_state_get_runstate() == RUN_STATE_RUNNING) { 281 if (autostart) { 282 vm_start(); 283 } else { 284 runstate_set(RUN_STATE_PAUSED); 285 } 286 } else { 287 runstate_set(global_state_get_runstate()); 288 } 289 /* 290 * This must happen after any state changes since as soon as an external 291 * observer sees this event they might start to prod at the VM assuming 292 * it's ready to use. 293 */ 294 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, 295 MIGRATION_STATUS_COMPLETED); 296 qemu_bh_delete(mis->bh); 297 migration_incoming_state_destroy(); 298 } 299 300 static void process_incoming_migration_co(void *opaque) 301 { 302 QEMUFile *f = opaque; 303 MigrationIncomingState *mis = migration_incoming_get_current(); 304 PostcopyState ps; 305 int ret; 306 307 mis->from_src_file = f; 308 mis->largest_page_size = qemu_ram_pagesize_largest(); 309 postcopy_state_set(POSTCOPY_INCOMING_NONE); 310 migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, 311 MIGRATION_STATUS_ACTIVE); 312 ret = qemu_loadvm_state(f); 313 314 ps = postcopy_state_get(); 315 trace_process_incoming_migration_co_end(ret, ps); 316 if (ps != POSTCOPY_INCOMING_NONE) { 317 if (ps == POSTCOPY_INCOMING_ADVISE) { 318 /* 319 * Where a migration had postcopy enabled (and thus went to advise) 320 * but managed to complete within the precopy period, we can use 321 * the normal exit. 322 */ 323 postcopy_ram_incoming_cleanup(mis); 324 } else if (ret >= 0) { 325 /* 326 * Postcopy was started, cleanup should happen at the end of the 327 * postcopy thread. 328 */ 329 trace_process_incoming_migration_co_postcopy_end_main(); 330 return; 331 } 332 /* Else if something went wrong then just fall out of the normal exit */ 333 } 334 335 /* we get COLO info, and know if we are in COLO mode */ 336 if (!ret && migration_incoming_enable_colo()) { 337 mis->migration_incoming_co = qemu_coroutine_self(); 338 qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming", 339 colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE); 340 mis->have_colo_incoming_thread = true; 341 qemu_coroutine_yield(); 342 343 /* Wait checkpoint incoming thread exit before free resource */ 344 qemu_thread_join(&mis->colo_incoming_thread); 345 } 346 347 if (ret < 0) { 348 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, 349 MIGRATION_STATUS_FAILED); 350 error_report("load of migration failed: %s", strerror(-ret)); 351 qemu_fclose(mis->from_src_file); 352 exit(EXIT_FAILURE); 353 } 354 mis->bh = qemu_bh_new(process_incoming_migration_bh, mis); 355 qemu_bh_schedule(mis->bh); 356 } 357 358 void migration_fd_process_incoming(QEMUFile *f) 359 { 360 Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, f); 361 362 qemu_file_set_blocking(f, false); 363 qemu_coroutine_enter(co); 364 } 365 366 /* 367 * Send a 'SHUT' message on the return channel with the given value 368 * to indicate that we've finished with the RP. Non-0 value indicates 369 * error. 370 */ 371 void migrate_send_rp_shut(MigrationIncomingState *mis, 372 uint32_t value) 373 { 374 uint32_t buf; 375 376 buf = cpu_to_be32(value); 377 migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); 378 } 379 380 /* 381 * Send a 'PONG' message on the return channel with the given value 382 * (normally in response to a 'PING') 383 */ 384 void migrate_send_rp_pong(MigrationIncomingState *mis, 385 uint32_t value) 386 { 387 uint32_t buf; 388 389 buf = cpu_to_be32(value); 390 migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); 391 } 392 393 MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) 394 { 395 MigrationCapabilityStatusList *head = NULL; 396 MigrationCapabilityStatusList *caps; 397 MigrationState *s = migrate_get_current(); 398 int i; 399 400 caps = NULL; /* silence compiler warning */ 401 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { 402 #ifndef CONFIG_LIVE_BLOCK_MIGRATION 403 if (i == MIGRATION_CAPABILITY_BLOCK) { 404 continue; 405 } 406 #endif 407 if (i == MIGRATION_CAPABILITY_X_COLO && !colo_supported()) { 408 continue; 409 } 410 if (head == NULL) { 411 head = g_malloc0(sizeof(*caps)); 412 caps = head; 413 } else { 414 caps->next = g_malloc0(sizeof(*caps)); 415 caps = caps->next; 416 } 417 caps->value = 418 g_malloc(sizeof(*caps->value)); 419 caps->value->capability = i; 420 caps->value->state = s->enabled_capabilities[i]; 421 } 422 423 return head; 424 } 425 426 MigrationParameters *qmp_query_migrate_parameters(Error **errp) 427 { 428 MigrationParameters *params; 429 MigrationState *s = migrate_get_current(); 430 431 params = g_malloc0(sizeof(*params)); 432 params->has_compress_level = true; 433 params->compress_level = s->parameters.compress_level; 434 params->has_compress_threads = true; 435 params->compress_threads = s->parameters.compress_threads; 436 params->has_decompress_threads = true; 437 params->decompress_threads = s->parameters.decompress_threads; 438 params->has_cpu_throttle_initial = true; 439 params->cpu_throttle_initial = s->parameters.cpu_throttle_initial; 440 params->has_cpu_throttle_increment = true; 441 params->cpu_throttle_increment = s->parameters.cpu_throttle_increment; 442 params->has_tls_creds = !!s->parameters.tls_creds; 443 params->tls_creds = g_strdup(s->parameters.tls_creds); 444 params->has_tls_hostname = !!s->parameters.tls_hostname; 445 params->tls_hostname = g_strdup(s->parameters.tls_hostname); 446 params->has_max_bandwidth = true; 447 params->max_bandwidth = s->parameters.max_bandwidth; 448 params->has_downtime_limit = true; 449 params->downtime_limit = s->parameters.downtime_limit; 450 params->has_x_checkpoint_delay = true; 451 params->x_checkpoint_delay = s->parameters.x_checkpoint_delay; 452 params->has_block_incremental = true; 453 params->block_incremental = s->parameters.block_incremental; 454 455 return params; 456 } 457 458 /* 459 * Return true if we're already in the middle of a migration 460 * (i.e. any of the active or setup states) 461 */ 462 static bool migration_is_setup_or_active(int state) 463 { 464 switch (state) { 465 case MIGRATION_STATUS_ACTIVE: 466 case MIGRATION_STATUS_POSTCOPY_ACTIVE: 467 case MIGRATION_STATUS_SETUP: 468 return true; 469 470 default: 471 return false; 472 473 } 474 } 475 476 static void populate_ram_info(MigrationInfo *info, MigrationState *s) 477 { 478 info->has_ram = true; 479 info->ram = g_malloc0(sizeof(*info->ram)); 480 info->ram->transferred = ram_counters.transferred; 481 info->ram->total = ram_bytes_total(); 482 info->ram->duplicate = ram_counters.duplicate; 483 /* legacy value. It is not used anymore */ 484 info->ram->skipped = 0; 485 info->ram->normal = ram_counters.normal; 486 info->ram->normal_bytes = ram_counters.normal * 487 qemu_target_page_size(); 488 info->ram->mbps = s->mbps; 489 info->ram->dirty_sync_count = ram_counters.dirty_sync_count; 490 info->ram->postcopy_requests = ram_counters.postcopy_requests; 491 info->ram->page_size = qemu_target_page_size(); 492 493 if (migrate_use_xbzrle()) { 494 info->has_xbzrle_cache = true; 495 info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); 496 info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); 497 info->xbzrle_cache->bytes = xbzrle_counters.bytes; 498 info->xbzrle_cache->pages = xbzrle_counters.pages; 499 info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss; 500 info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate; 501 info->xbzrle_cache->overflow = xbzrle_counters.overflow; 502 } 503 504 if (cpu_throttle_active()) { 505 info->has_cpu_throttle_percentage = true; 506 info->cpu_throttle_percentage = cpu_throttle_get_percentage(); 507 } 508 509 if (s->state != MIGRATION_STATUS_COMPLETED) { 510 info->ram->remaining = ram_bytes_remaining(); 511 info->ram->dirty_pages_rate = ram_counters.dirty_pages_rate; 512 } 513 } 514 515 static void populate_disk_info(MigrationInfo *info) 516 { 517 if (blk_mig_active()) { 518 info->has_disk = true; 519 info->disk = g_malloc0(sizeof(*info->disk)); 520 info->disk->transferred = blk_mig_bytes_transferred(); 521 info->disk->remaining = blk_mig_bytes_remaining(); 522 info->disk->total = blk_mig_bytes_total(); 523 } 524 } 525 526 MigrationInfo *qmp_query_migrate(Error **errp) 527 { 528 MigrationInfo *info = g_malloc0(sizeof(*info)); 529 MigrationState *s = migrate_get_current(); 530 531 switch (s->state) { 532 case MIGRATION_STATUS_NONE: 533 /* no migration has happened ever */ 534 break; 535 case MIGRATION_STATUS_SETUP: 536 info->has_status = true; 537 info->has_total_time = false; 538 break; 539 case MIGRATION_STATUS_ACTIVE: 540 case MIGRATION_STATUS_CANCELLING: 541 case MIGRATION_STATUS_POSTCOPY_ACTIVE: 542 /* TODO add some postcopy stats */ 543 info->has_status = true; 544 info->has_total_time = true; 545 info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) 546 - s->total_time; 547 info->has_expected_downtime = true; 548 info->expected_downtime = s->expected_downtime; 549 info->has_setup_time = true; 550 info->setup_time = s->setup_time; 551 552 populate_ram_info(info, s); 553 populate_disk_info(info); 554 break; 555 case MIGRATION_STATUS_COLO: 556 info->has_status = true; 557 /* TODO: display COLO specific information (checkpoint info etc.) */ 558 break; 559 case MIGRATION_STATUS_COMPLETED: 560 info->has_status = true; 561 info->has_total_time = true; 562 info->total_time = s->total_time; 563 info->has_downtime = true; 564 info->downtime = s->downtime; 565 info->has_setup_time = true; 566 info->setup_time = s->setup_time; 567 568 populate_ram_info(info, s); 569 break; 570 case MIGRATION_STATUS_FAILED: 571 info->has_status = true; 572 if (s->error) { 573 info->has_error_desc = true; 574 info->error_desc = g_strdup(error_get_pretty(s->error)); 575 } 576 break; 577 case MIGRATION_STATUS_CANCELLED: 578 info->has_status = true; 579 break; 580 } 581 info->status = s->state; 582 583 return info; 584 } 585 586 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, 587 Error **errp) 588 { 589 MigrationState *s = migrate_get_current(); 590 MigrationCapabilityStatusList *cap; 591 bool old_postcopy_cap = migrate_postcopy_ram(); 592 593 if (migration_is_setup_or_active(s->state)) { 594 error_setg(errp, QERR_MIGRATION_ACTIVE); 595 return; 596 } 597 598 for (cap = params; cap; cap = cap->next) { 599 #ifndef CONFIG_LIVE_BLOCK_MIGRATION 600 if (cap->value->capability == MIGRATION_CAPABILITY_BLOCK 601 && cap->value->state) { 602 error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) " 603 "block migration"); 604 error_append_hint(errp, "Use drive_mirror+NBD instead.\n"); 605 continue; 606 } 607 #endif 608 if (cap->value->capability == MIGRATION_CAPABILITY_X_COLO) { 609 if (!colo_supported()) { 610 error_setg(errp, "COLO is not currently supported, please" 611 " configure with --enable-colo option in order to" 612 " support COLO feature"); 613 continue; 614 } 615 } 616 s->enabled_capabilities[cap->value->capability] = cap->value->state; 617 } 618 619 if (migrate_postcopy_ram()) { 620 if (migrate_use_compression()) { 621 /* The decompression threads asynchronously write into RAM 622 * rather than use the atomic copies needed to avoid 623 * userfaulting. It should be possible to fix the decompression 624 * threads for compatibility in future. 625 */ 626 error_report("Postcopy is not currently compatible with " 627 "compression"); 628 s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] = 629 false; 630 } 631 /* This check is reasonably expensive, so only when it's being 632 * set the first time, also it's only the destination that needs 633 * special support. 634 */ 635 if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) && 636 !postcopy_ram_supported_by_host()) { 637 /* postcopy_ram_supported_by_host will have emitted a more 638 * detailed message 639 */ 640 error_report("Postcopy is not supported"); 641 s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] = 642 false; 643 } 644 } 645 } 646 647 void qmp_migrate_set_parameters(MigrationParameters *params, Error **errp) 648 { 649 MigrationState *s = migrate_get_current(); 650 651 if (params->has_compress_level && 652 (params->compress_level < 0 || params->compress_level > 9)) { 653 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level", 654 "is invalid, it should be in the range of 0 to 9"); 655 return; 656 } 657 if (params->has_compress_threads && 658 (params->compress_threads < 1 || params->compress_threads > 255)) { 659 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 660 "compress_threads", 661 "is invalid, it should be in the range of 1 to 255"); 662 return; 663 } 664 if (params->has_decompress_threads && 665 (params->decompress_threads < 1 || params->decompress_threads > 255)) { 666 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 667 "decompress_threads", 668 "is invalid, it should be in the range of 1 to 255"); 669 return; 670 } 671 if (params->has_cpu_throttle_initial && 672 (params->cpu_throttle_initial < 1 || 673 params->cpu_throttle_initial > 99)) { 674 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 675 "cpu_throttle_initial", 676 "an integer in the range of 1 to 99"); 677 return; 678 } 679 if (params->has_cpu_throttle_increment && 680 (params->cpu_throttle_increment < 1 || 681 params->cpu_throttle_increment > 99)) { 682 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 683 "cpu_throttle_increment", 684 "an integer in the range of 1 to 99"); 685 return; 686 } 687 if (params->has_max_bandwidth && 688 (params->max_bandwidth < 0 || params->max_bandwidth > SIZE_MAX)) { 689 error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the" 690 " range of 0 to %zu bytes/second", SIZE_MAX); 691 return; 692 } 693 if (params->has_downtime_limit && 694 (params->downtime_limit < 0 || 695 params->downtime_limit > MAX_MIGRATE_DOWNTIME)) { 696 error_setg(errp, "Parameter 'downtime_limit' expects an integer in " 697 "the range of 0 to %d milliseconds", 698 MAX_MIGRATE_DOWNTIME); 699 return; 700 } 701 if (params->has_x_checkpoint_delay && (params->x_checkpoint_delay < 0)) { 702 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 703 "x_checkpoint_delay", 704 "is invalid, it should be positive"); 705 } 706 707 if (params->has_compress_level) { 708 s->parameters.compress_level = params->compress_level; 709 } 710 if (params->has_compress_threads) { 711 s->parameters.compress_threads = params->compress_threads; 712 } 713 if (params->has_decompress_threads) { 714 s->parameters.decompress_threads = params->decompress_threads; 715 } 716 if (params->has_cpu_throttle_initial) { 717 s->parameters.cpu_throttle_initial = params->cpu_throttle_initial; 718 } 719 if (params->has_cpu_throttle_increment) { 720 s->parameters.cpu_throttle_increment = params->cpu_throttle_increment; 721 } 722 if (params->has_tls_creds) { 723 g_free(s->parameters.tls_creds); 724 s->parameters.tls_creds = g_strdup(params->tls_creds); 725 } 726 if (params->has_tls_hostname) { 727 g_free(s->parameters.tls_hostname); 728 s->parameters.tls_hostname = g_strdup(params->tls_hostname); 729 } 730 if (params->has_max_bandwidth) { 731 s->parameters.max_bandwidth = params->max_bandwidth; 732 if (s->to_dst_file) { 733 qemu_file_set_rate_limit(s->to_dst_file, 734 s->parameters.max_bandwidth / XFER_LIMIT_RATIO); 735 } 736 } 737 if (params->has_downtime_limit) { 738 s->parameters.downtime_limit = params->downtime_limit; 739 } 740 741 if (params->has_x_checkpoint_delay) { 742 s->parameters.x_checkpoint_delay = params->x_checkpoint_delay; 743 if (migration_in_colo_state()) { 744 colo_checkpoint_notify(s); 745 } 746 } 747 if (params->has_block_incremental) { 748 s->parameters.block_incremental = params->block_incremental; 749 } 750 } 751 752 753 void qmp_migrate_start_postcopy(Error **errp) 754 { 755 MigrationState *s = migrate_get_current(); 756 757 if (!migrate_postcopy_ram()) { 758 error_setg(errp, "Enable postcopy with migrate_set_capability before" 759 " the start of migration"); 760 return; 761 } 762 763 if (s->state == MIGRATION_STATUS_NONE) { 764 error_setg(errp, "Postcopy must be started after migration has been" 765 " started"); 766 return; 767 } 768 /* 769 * we don't error if migration has finished since that would be racy 770 * with issuing this command. 771 */ 772 atomic_set(&s->start_postcopy, true); 773 } 774 775 /* shared migration helpers */ 776 777 void migrate_set_state(int *state, int old_state, int new_state) 778 { 779 if (atomic_cmpxchg(state, old_state, new_state) == old_state) { 780 trace_migrate_set_state(new_state); 781 migrate_generate_event(new_state); 782 } 783 } 784 785 void migrate_set_block_enabled(bool value, Error **errp) 786 { 787 MigrationCapabilityStatusList *cap; 788 789 cap = g_new0(MigrationCapabilityStatusList, 1); 790 cap->value = g_new0(MigrationCapabilityStatus, 1); 791 cap->value->capability = MIGRATION_CAPABILITY_BLOCK; 792 cap->value->state = value; 793 qmp_migrate_set_capabilities(cap, errp); 794 qapi_free_MigrationCapabilityStatusList(cap); 795 } 796 797 static void migrate_set_block_incremental(MigrationState *s, bool value) 798 { 799 s->parameters.block_incremental = value; 800 } 801 802 static void block_cleanup_parameters(MigrationState *s) 803 { 804 if (s->must_remove_block_options) { 805 /* setting to false can never fail */ 806 migrate_set_block_enabled(false, &error_abort); 807 migrate_set_block_incremental(s, false); 808 s->must_remove_block_options = false; 809 } 810 } 811 812 static void migrate_fd_cleanup(void *opaque) 813 { 814 MigrationState *s = opaque; 815 816 qemu_bh_delete(s->cleanup_bh); 817 s->cleanup_bh = NULL; 818 819 if (s->to_dst_file) { 820 trace_migrate_fd_cleanup(); 821 qemu_mutex_unlock_iothread(); 822 if (s->migration_thread_running) { 823 qemu_thread_join(&s->thread); 824 s->migration_thread_running = false; 825 } 826 qemu_mutex_lock_iothread(); 827 828 qemu_fclose(s->to_dst_file); 829 s->to_dst_file = NULL; 830 } 831 832 assert((s->state != MIGRATION_STATUS_ACTIVE) && 833 (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE)); 834 835 if (s->state == MIGRATION_STATUS_CANCELLING) { 836 migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING, 837 MIGRATION_STATUS_CANCELLED); 838 } 839 840 notifier_list_notify(&migration_state_notifiers, s); 841 block_cleanup_parameters(s); 842 } 843 844 void migrate_fd_error(MigrationState *s, const Error *error) 845 { 846 trace_migrate_fd_error(error_get_pretty(error)); 847 assert(s->to_dst_file == NULL); 848 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 849 MIGRATION_STATUS_FAILED); 850 if (!s->error) { 851 s->error = error_copy(error); 852 } 853 notifier_list_notify(&migration_state_notifiers, s); 854 block_cleanup_parameters(s); 855 } 856 857 static void migrate_fd_cancel(MigrationState *s) 858 { 859 int old_state ; 860 QEMUFile *f = migrate_get_current()->to_dst_file; 861 trace_migrate_fd_cancel(); 862 863 if (s->rp_state.from_dst_file) { 864 /* shutdown the rp socket, so causing the rp thread to shutdown */ 865 qemu_file_shutdown(s->rp_state.from_dst_file); 866 } 867 868 do { 869 old_state = s->state; 870 if (!migration_is_setup_or_active(old_state)) { 871 break; 872 } 873 migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING); 874 } while (s->state != MIGRATION_STATUS_CANCELLING); 875 876 /* 877 * If we're unlucky the migration code might be stuck somewhere in a 878 * send/write while the network has failed and is waiting to timeout; 879 * if we've got shutdown(2) available then we can force it to quit. 880 * The outgoing qemu file gets closed in migrate_fd_cleanup that is 881 * called in a bh, so there is no race against this cancel. 882 */ 883 if (s->state == MIGRATION_STATUS_CANCELLING && f) { 884 qemu_file_shutdown(f); 885 } 886 if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) { 887 Error *local_err = NULL; 888 889 bdrv_invalidate_cache_all(&local_err); 890 if (local_err) { 891 error_report_err(local_err); 892 } else { 893 s->block_inactive = false; 894 } 895 } 896 block_cleanup_parameters(s); 897 } 898 899 void add_migration_state_change_notifier(Notifier *notify) 900 { 901 notifier_list_add(&migration_state_notifiers, notify); 902 } 903 904 void remove_migration_state_change_notifier(Notifier *notify) 905 { 906 notifier_remove(notify); 907 } 908 909 bool migration_in_setup(MigrationState *s) 910 { 911 return s->state == MIGRATION_STATUS_SETUP; 912 } 913 914 bool migration_has_finished(MigrationState *s) 915 { 916 return s->state == MIGRATION_STATUS_COMPLETED; 917 } 918 919 bool migration_has_failed(MigrationState *s) 920 { 921 return (s->state == MIGRATION_STATUS_CANCELLED || 922 s->state == MIGRATION_STATUS_FAILED); 923 } 924 925 bool migration_in_postcopy(void) 926 { 927 MigrationState *s = migrate_get_current(); 928 929 return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); 930 } 931 932 bool migration_in_postcopy_after_devices(MigrationState *s) 933 { 934 return migration_in_postcopy() && s->postcopy_after_devices; 935 } 936 937 bool migration_is_idle(void) 938 { 939 MigrationState *s = migrate_get_current(); 940 941 switch (s->state) { 942 case MIGRATION_STATUS_NONE: 943 case MIGRATION_STATUS_CANCELLED: 944 case MIGRATION_STATUS_COMPLETED: 945 case MIGRATION_STATUS_FAILED: 946 return true; 947 case MIGRATION_STATUS_SETUP: 948 case MIGRATION_STATUS_CANCELLING: 949 case MIGRATION_STATUS_ACTIVE: 950 case MIGRATION_STATUS_POSTCOPY_ACTIVE: 951 case MIGRATION_STATUS_COLO: 952 return false; 953 case MIGRATION_STATUS__MAX: 954 g_assert_not_reached(); 955 } 956 957 return false; 958 } 959 960 MigrationState *migrate_init(void) 961 { 962 MigrationState *s = migrate_get_current(); 963 964 /* 965 * Reinitialise all migration state, except 966 * parameters/capabilities that the user set, and 967 * locks. 968 */ 969 s->bytes_xfer = 0; 970 s->xfer_limit = 0; 971 s->cleanup_bh = 0; 972 s->to_dst_file = NULL; 973 s->state = MIGRATION_STATUS_NONE; 974 s->rp_state.from_dst_file = NULL; 975 s->rp_state.error = false; 976 s->mbps = 0.0; 977 s->downtime = 0; 978 s->expected_downtime = 0; 979 s->setup_time = 0; 980 s->start_postcopy = false; 981 s->postcopy_after_devices = false; 982 s->migration_thread_running = false; 983 error_free(s->error); 984 s->error = NULL; 985 986 migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); 987 988 s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 989 return s; 990 } 991 992 static GSList *migration_blockers; 993 994 int migrate_add_blocker(Error *reason, Error **errp) 995 { 996 if (migrate_get_current()->only_migratable) { 997 error_propagate(errp, error_copy(reason)); 998 error_prepend(errp, "disallowing migration blocker " 999 "(--only_migratable) for: "); 1000 return -EACCES; 1001 } 1002 1003 if (migration_is_idle()) { 1004 migration_blockers = g_slist_prepend(migration_blockers, reason); 1005 return 0; 1006 } 1007 1008 error_propagate(errp, error_copy(reason)); 1009 error_prepend(errp, "disallowing migration blocker (migration in " 1010 "progress) for: "); 1011 return -EBUSY; 1012 } 1013 1014 void migrate_del_blocker(Error *reason) 1015 { 1016 migration_blockers = g_slist_remove(migration_blockers, reason); 1017 } 1018 1019 void qmp_migrate_incoming(const char *uri, Error **errp) 1020 { 1021 Error *local_err = NULL; 1022 static bool once = true; 1023 1024 if (!deferred_incoming) { 1025 error_setg(errp, "For use with '-incoming defer'"); 1026 return; 1027 } 1028 if (!once) { 1029 error_setg(errp, "The incoming migration has already been started"); 1030 } 1031 1032 qemu_start_incoming_migration(uri, &local_err); 1033 1034 if (local_err) { 1035 error_propagate(errp, local_err); 1036 return; 1037 } 1038 1039 once = false; 1040 } 1041 1042 bool migration_is_blocked(Error **errp) 1043 { 1044 if (qemu_savevm_state_blocked(errp)) { 1045 return true; 1046 } 1047 1048 if (migration_blockers) { 1049 error_propagate(errp, error_copy(migration_blockers->data)); 1050 return true; 1051 } 1052 1053 return false; 1054 } 1055 1056 void qmp_migrate(const char *uri, bool has_blk, bool blk, 1057 bool has_inc, bool inc, bool has_detach, bool detach, 1058 Error **errp) 1059 { 1060 Error *local_err = NULL; 1061 MigrationState *s = migrate_get_current(); 1062 const char *p; 1063 1064 if (migration_is_setup_or_active(s->state) || 1065 s->state == MIGRATION_STATUS_CANCELLING || 1066 s->state == MIGRATION_STATUS_COLO) { 1067 error_setg(errp, QERR_MIGRATION_ACTIVE); 1068 return; 1069 } 1070 if (runstate_check(RUN_STATE_INMIGRATE)) { 1071 error_setg(errp, "Guest is waiting for an incoming migration"); 1072 return; 1073 } 1074 1075 if (migration_is_blocked(errp)) { 1076 return; 1077 } 1078 1079 if ((has_blk && blk) || (has_inc && inc)) { 1080 if (migrate_use_block() || migrate_use_block_incremental()) { 1081 error_setg(errp, "Command options are incompatible with " 1082 "current migration capabilities"); 1083 return; 1084 } 1085 migrate_set_block_enabled(true, &local_err); 1086 if (local_err) { 1087 error_propagate(errp, local_err); 1088 return; 1089 } 1090 s->must_remove_block_options = true; 1091 } 1092 1093 if (has_inc && inc) { 1094 migrate_set_block_incremental(s, true); 1095 } 1096 1097 s = migrate_init(); 1098 1099 if (strstart(uri, "tcp:", &p)) { 1100 tcp_start_outgoing_migration(s, p, &local_err); 1101 #ifdef CONFIG_RDMA 1102 } else if (strstart(uri, "rdma:", &p)) { 1103 rdma_start_outgoing_migration(s, p, &local_err); 1104 #endif 1105 } else if (strstart(uri, "exec:", &p)) { 1106 exec_start_outgoing_migration(s, p, &local_err); 1107 } else if (strstart(uri, "unix:", &p)) { 1108 unix_start_outgoing_migration(s, p, &local_err); 1109 } else if (strstart(uri, "fd:", &p)) { 1110 fd_start_outgoing_migration(s, p, &local_err); 1111 } else { 1112 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri", 1113 "a valid migration protocol"); 1114 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 1115 MIGRATION_STATUS_FAILED); 1116 return; 1117 } 1118 1119 if (local_err) { 1120 migrate_fd_error(s, local_err); 1121 error_propagate(errp, local_err); 1122 return; 1123 } 1124 } 1125 1126 void qmp_migrate_cancel(Error **errp) 1127 { 1128 migrate_fd_cancel(migrate_get_current()); 1129 } 1130 1131 void qmp_migrate_set_cache_size(int64_t value, Error **errp) 1132 { 1133 MigrationState *s = migrate_get_current(); 1134 int64_t new_size; 1135 1136 /* Check for truncation */ 1137 if (value != (size_t)value) { 1138 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", 1139 "exceeding address space"); 1140 return; 1141 } 1142 1143 /* Cache should not be larger than guest ram size */ 1144 if (value > ram_bytes_total()) { 1145 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", 1146 "exceeds guest ram size "); 1147 return; 1148 } 1149 1150 new_size = xbzrle_cache_resize(value); 1151 if (new_size < 0) { 1152 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", 1153 "is smaller than page size"); 1154 return; 1155 } 1156 1157 s->xbzrle_cache_size = new_size; 1158 } 1159 1160 int64_t qmp_query_migrate_cache_size(Error **errp) 1161 { 1162 return migrate_xbzrle_cache_size(); 1163 } 1164 1165 void qmp_migrate_set_speed(int64_t value, Error **errp) 1166 { 1167 MigrationParameters p = { 1168 .has_max_bandwidth = true, 1169 .max_bandwidth = value, 1170 }; 1171 1172 qmp_migrate_set_parameters(&p, errp); 1173 } 1174 1175 void qmp_migrate_set_downtime(double value, Error **errp) 1176 { 1177 if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) { 1178 error_setg(errp, "Parameter 'downtime_limit' expects an integer in " 1179 "the range of 0 to %d seconds", 1180 MAX_MIGRATE_DOWNTIME_SECONDS); 1181 return; 1182 } 1183 1184 value *= 1000; /* Convert to milliseconds */ 1185 value = MAX(0, MIN(INT64_MAX, value)); 1186 1187 MigrationParameters p = { 1188 .has_downtime_limit = true, 1189 .downtime_limit = value, 1190 }; 1191 1192 qmp_migrate_set_parameters(&p, errp); 1193 } 1194 1195 bool migrate_release_ram(void) 1196 { 1197 MigrationState *s; 1198 1199 s = migrate_get_current(); 1200 1201 return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM]; 1202 } 1203 1204 bool migrate_postcopy_ram(void) 1205 { 1206 MigrationState *s; 1207 1208 s = migrate_get_current(); 1209 1210 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM]; 1211 } 1212 1213 bool migrate_auto_converge(void) 1214 { 1215 MigrationState *s; 1216 1217 s = migrate_get_current(); 1218 1219 return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; 1220 } 1221 1222 bool migrate_zero_blocks(void) 1223 { 1224 MigrationState *s; 1225 1226 s = migrate_get_current(); 1227 1228 return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; 1229 } 1230 1231 bool migrate_use_compression(void) 1232 { 1233 MigrationState *s; 1234 1235 s = migrate_get_current(); 1236 1237 return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS]; 1238 } 1239 1240 int migrate_compress_level(void) 1241 { 1242 MigrationState *s; 1243 1244 s = migrate_get_current(); 1245 1246 return s->parameters.compress_level; 1247 } 1248 1249 int migrate_compress_threads(void) 1250 { 1251 MigrationState *s; 1252 1253 s = migrate_get_current(); 1254 1255 return s->parameters.compress_threads; 1256 } 1257 1258 int migrate_decompress_threads(void) 1259 { 1260 MigrationState *s; 1261 1262 s = migrate_get_current(); 1263 1264 return s->parameters.decompress_threads; 1265 } 1266 1267 bool migrate_use_events(void) 1268 { 1269 MigrationState *s; 1270 1271 s = migrate_get_current(); 1272 1273 return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS]; 1274 } 1275 1276 int migrate_use_xbzrle(void) 1277 { 1278 MigrationState *s; 1279 1280 s = migrate_get_current(); 1281 1282 return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; 1283 } 1284 1285 int64_t migrate_xbzrle_cache_size(void) 1286 { 1287 MigrationState *s; 1288 1289 s = migrate_get_current(); 1290 1291 return s->xbzrle_cache_size; 1292 } 1293 1294 bool migrate_use_block(void) 1295 { 1296 MigrationState *s; 1297 1298 s = migrate_get_current(); 1299 1300 return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK]; 1301 } 1302 1303 bool migrate_use_return_path(void) 1304 { 1305 MigrationState *s; 1306 1307 s = migrate_get_current(); 1308 1309 return s->enabled_capabilities[MIGRATION_CAPABILITY_RETURN_PATH]; 1310 } 1311 1312 bool migrate_use_block_incremental(void) 1313 { 1314 MigrationState *s; 1315 1316 s = migrate_get_current(); 1317 1318 return s->parameters.block_incremental; 1319 } 1320 1321 /* migration thread support */ 1322 /* 1323 * Something bad happened to the RP stream, mark an error 1324 * The caller shall print or trace something to indicate why 1325 */ 1326 static void mark_source_rp_bad(MigrationState *s) 1327 { 1328 s->rp_state.error = true; 1329 } 1330 1331 static struct rp_cmd_args { 1332 ssize_t len; /* -1 = variable */ 1333 const char *name; 1334 } rp_cmd_args[] = { 1335 [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, 1336 [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, 1337 [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, 1338 [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" }, 1339 [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" }, 1340 [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, 1341 }; 1342 1343 /* 1344 * Process a request for pages received on the return path, 1345 * We're allowed to send more than requested (e.g. to round to our page size) 1346 * and we don't need to send pages that have already been sent. 1347 */ 1348 static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname, 1349 ram_addr_t start, size_t len) 1350 { 1351 long our_host_ps = getpagesize(); 1352 1353 trace_migrate_handle_rp_req_pages(rbname, start, len); 1354 1355 /* 1356 * Since we currently insist on matching page sizes, just sanity check 1357 * we're being asked for whole host pages. 1358 */ 1359 if (start & (our_host_ps-1) || 1360 (len & (our_host_ps-1))) { 1361 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT 1362 " len: %zd", __func__, start, len); 1363 mark_source_rp_bad(ms); 1364 return; 1365 } 1366 1367 if (ram_save_queue_pages(rbname, start, len)) { 1368 mark_source_rp_bad(ms); 1369 } 1370 } 1371 1372 /* 1373 * Handles messages sent on the return path towards the source VM 1374 * 1375 */ 1376 static void *source_return_path_thread(void *opaque) 1377 { 1378 MigrationState *ms = opaque; 1379 QEMUFile *rp = ms->rp_state.from_dst_file; 1380 uint16_t header_len, header_type; 1381 uint8_t buf[512]; 1382 uint32_t tmp32, sibling_error; 1383 ram_addr_t start = 0; /* =0 to silence warning */ 1384 size_t len = 0, expected_len; 1385 int res; 1386 1387 trace_source_return_path_thread_entry(); 1388 while (!ms->rp_state.error && !qemu_file_get_error(rp) && 1389 migration_is_setup_or_active(ms->state)) { 1390 trace_source_return_path_thread_loop_top(); 1391 header_type = qemu_get_be16(rp); 1392 header_len = qemu_get_be16(rp); 1393 1394 if (header_type >= MIG_RP_MSG_MAX || 1395 header_type == MIG_RP_MSG_INVALID) { 1396 error_report("RP: Received invalid message 0x%04x length 0x%04x", 1397 header_type, header_len); 1398 mark_source_rp_bad(ms); 1399 goto out; 1400 } 1401 1402 if ((rp_cmd_args[header_type].len != -1 && 1403 header_len != rp_cmd_args[header_type].len) || 1404 header_len > sizeof(buf)) { 1405 error_report("RP: Received '%s' message (0x%04x) with" 1406 "incorrect length %d expecting %zu", 1407 rp_cmd_args[header_type].name, header_type, header_len, 1408 (size_t)rp_cmd_args[header_type].len); 1409 mark_source_rp_bad(ms); 1410 goto out; 1411 } 1412 1413 /* We know we've got a valid header by this point */ 1414 res = qemu_get_buffer(rp, buf, header_len); 1415 if (res != header_len) { 1416 error_report("RP: Failed reading data for message 0x%04x" 1417 " read %d expected %d", 1418 header_type, res, header_len); 1419 mark_source_rp_bad(ms); 1420 goto out; 1421 } 1422 1423 /* OK, we have the message and the data */ 1424 switch (header_type) { 1425 case MIG_RP_MSG_SHUT: 1426 sibling_error = ldl_be_p(buf); 1427 trace_source_return_path_thread_shut(sibling_error); 1428 if (sibling_error) { 1429 error_report("RP: Sibling indicated error %d", sibling_error); 1430 mark_source_rp_bad(ms); 1431 } 1432 /* 1433 * We'll let the main thread deal with closing the RP 1434 * we could do a shutdown(2) on it, but we're the only user 1435 * anyway, so there's nothing gained. 1436 */ 1437 goto out; 1438 1439 case MIG_RP_MSG_PONG: 1440 tmp32 = ldl_be_p(buf); 1441 trace_source_return_path_thread_pong(tmp32); 1442 break; 1443 1444 case MIG_RP_MSG_REQ_PAGES: 1445 start = ldq_be_p(buf); 1446 len = ldl_be_p(buf + 8); 1447 migrate_handle_rp_req_pages(ms, NULL, start, len); 1448 break; 1449 1450 case MIG_RP_MSG_REQ_PAGES_ID: 1451 expected_len = 12 + 1; /* header + termination */ 1452 1453 if (header_len >= expected_len) { 1454 start = ldq_be_p(buf); 1455 len = ldl_be_p(buf + 8); 1456 /* Now we expect an idstr */ 1457 tmp32 = buf[12]; /* Length of the following idstr */ 1458 buf[13 + tmp32] = '\0'; 1459 expected_len += tmp32; 1460 } 1461 if (header_len != expected_len) { 1462 error_report("RP: Req_Page_id with length %d expecting %zd", 1463 header_len, expected_len); 1464 mark_source_rp_bad(ms); 1465 goto out; 1466 } 1467 migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len); 1468 break; 1469 1470 default: 1471 break; 1472 } 1473 } 1474 if (qemu_file_get_error(rp)) { 1475 trace_source_return_path_thread_bad_end(); 1476 mark_source_rp_bad(ms); 1477 } 1478 1479 trace_source_return_path_thread_end(); 1480 out: 1481 ms->rp_state.from_dst_file = NULL; 1482 qemu_fclose(rp); 1483 return NULL; 1484 } 1485 1486 static int open_return_path_on_source(MigrationState *ms) 1487 { 1488 1489 ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file); 1490 if (!ms->rp_state.from_dst_file) { 1491 return -1; 1492 } 1493 1494 trace_open_return_path_on_source(); 1495 qemu_thread_create(&ms->rp_state.rp_thread, "return path", 1496 source_return_path_thread, ms, QEMU_THREAD_JOINABLE); 1497 1498 trace_open_return_path_on_source_continue(); 1499 1500 return 0; 1501 } 1502 1503 /* Returns 0 if the RP was ok, otherwise there was an error on the RP */ 1504 static int await_return_path_close_on_source(MigrationState *ms) 1505 { 1506 /* 1507 * If this is a normal exit then the destination will send a SHUT and the 1508 * rp_thread will exit, however if there's an error we need to cause 1509 * it to exit. 1510 */ 1511 if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) { 1512 /* 1513 * shutdown(2), if we have it, will cause it to unblock if it's stuck 1514 * waiting for the destination. 1515 */ 1516 qemu_file_shutdown(ms->rp_state.from_dst_file); 1517 mark_source_rp_bad(ms); 1518 } 1519 trace_await_return_path_close_on_source_joining(); 1520 qemu_thread_join(&ms->rp_state.rp_thread); 1521 trace_await_return_path_close_on_source_close(); 1522 return ms->rp_state.error; 1523 } 1524 1525 /* 1526 * Switch from normal iteration to postcopy 1527 * Returns non-0 on error 1528 */ 1529 static int postcopy_start(MigrationState *ms, bool *old_vm_running) 1530 { 1531 int ret; 1532 QIOChannelBuffer *bioc; 1533 QEMUFile *fb; 1534 int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 1535 bool restart_block = false; 1536 migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, 1537 MIGRATION_STATUS_POSTCOPY_ACTIVE); 1538 1539 trace_postcopy_start(); 1540 qemu_mutex_lock_iothread(); 1541 trace_postcopy_start_set_run(); 1542 1543 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); 1544 *old_vm_running = runstate_is_running(); 1545 global_state_store(); 1546 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); 1547 if (ret < 0) { 1548 goto fail; 1549 } 1550 1551 ret = bdrv_inactivate_all(); 1552 if (ret < 0) { 1553 goto fail; 1554 } 1555 restart_block = true; 1556 1557 /* 1558 * Cause any non-postcopiable, but iterative devices to 1559 * send out their final data. 1560 */ 1561 qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false); 1562 1563 /* 1564 * in Finish migrate and with the io-lock held everything should 1565 * be quiet, but we've potentially still got dirty pages and we 1566 * need to tell the destination to throw any pages it's already received 1567 * that are dirty 1568 */ 1569 if (ram_postcopy_send_discard_bitmap(ms)) { 1570 error_report("postcopy send discard bitmap failed"); 1571 goto fail; 1572 } 1573 1574 /* 1575 * send rest of state - note things that are doing postcopy 1576 * will notice we're in POSTCOPY_ACTIVE and not actually 1577 * wrap their state up here 1578 */ 1579 qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX); 1580 /* Ping just for debugging, helps line traces up */ 1581 qemu_savevm_send_ping(ms->to_dst_file, 2); 1582 1583 /* 1584 * While loading the device state we may trigger page transfer 1585 * requests and the fd must be free to process those, and thus 1586 * the destination must read the whole device state off the fd before 1587 * it starts processing it. Unfortunately the ad-hoc migration format 1588 * doesn't allow the destination to know the size to read without fully 1589 * parsing it through each devices load-state code (especially the open 1590 * coded devices that use get/put). 1591 * So we wrap the device state up in a package with a length at the start; 1592 * to do this we use a qemu_buf to hold the whole of the device state. 1593 */ 1594 bioc = qio_channel_buffer_new(4096); 1595 qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer"); 1596 fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc)); 1597 object_unref(OBJECT(bioc)); 1598 1599 /* 1600 * Make sure the receiver can get incoming pages before we send the rest 1601 * of the state 1602 */ 1603 qemu_savevm_send_postcopy_listen(fb); 1604 1605 qemu_savevm_state_complete_precopy(fb, false, false); 1606 qemu_savevm_send_ping(fb, 3); 1607 1608 qemu_savevm_send_postcopy_run(fb); 1609 1610 /* <><> end of stuff going into the package */ 1611 1612 /* Last point of recovery; as soon as we send the package the destination 1613 * can open devices and potentially start running. 1614 * Lets just check again we've not got any errors. 1615 */ 1616 ret = qemu_file_get_error(ms->to_dst_file); 1617 if (ret) { 1618 error_report("postcopy_start: Migration stream errored (pre package)"); 1619 goto fail_closefb; 1620 } 1621 1622 restart_block = false; 1623 1624 /* Now send that blob */ 1625 if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) { 1626 goto fail_closefb; 1627 } 1628 qemu_fclose(fb); 1629 1630 /* Send a notify to give a chance for anything that needs to happen 1631 * at the transition to postcopy and after the device state; in particular 1632 * spice needs to trigger a transition now 1633 */ 1634 ms->postcopy_after_devices = true; 1635 notifier_list_notify(&migration_state_notifiers, ms); 1636 1637 ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop; 1638 1639 qemu_mutex_unlock_iothread(); 1640 1641 /* 1642 * Although this ping is just for debug, it could potentially be 1643 * used for getting a better measurement of downtime at the source. 1644 */ 1645 qemu_savevm_send_ping(ms->to_dst_file, 4); 1646 1647 if (migrate_release_ram()) { 1648 ram_postcopy_migrated_memory_release(ms); 1649 } 1650 1651 ret = qemu_file_get_error(ms->to_dst_file); 1652 if (ret) { 1653 error_report("postcopy_start: Migration stream errored"); 1654 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, 1655 MIGRATION_STATUS_FAILED); 1656 } 1657 1658 return ret; 1659 1660 fail_closefb: 1661 qemu_fclose(fb); 1662 fail: 1663 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, 1664 MIGRATION_STATUS_FAILED); 1665 if (restart_block) { 1666 /* A failure happened early enough that we know the destination hasn't 1667 * accessed block devices, so we're safe to recover. 1668 */ 1669 Error *local_err = NULL; 1670 1671 bdrv_invalidate_cache_all(&local_err); 1672 if (local_err) { 1673 error_report_err(local_err); 1674 } 1675 } 1676 qemu_mutex_unlock_iothread(); 1677 return -1; 1678 } 1679 1680 /** 1681 * migration_completion: Used by migration_thread when there's not much left. 1682 * The caller 'breaks' the loop when this returns. 1683 * 1684 * @s: Current migration state 1685 * @current_active_state: The migration state we expect to be in 1686 * @*old_vm_running: Pointer to old_vm_running flag 1687 * @*start_time: Pointer to time to update 1688 */ 1689 static void migration_completion(MigrationState *s, int current_active_state, 1690 bool *old_vm_running, 1691 int64_t *start_time) 1692 { 1693 int ret; 1694 1695 if (s->state == MIGRATION_STATUS_ACTIVE) { 1696 qemu_mutex_lock_iothread(); 1697 *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 1698 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); 1699 *old_vm_running = runstate_is_running(); 1700 ret = global_state_store(); 1701 1702 if (!ret) { 1703 bool inactivate = !migrate_colo_enabled(); 1704 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); 1705 if (ret >= 0) { 1706 qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); 1707 ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false, 1708 inactivate); 1709 } 1710 if (inactivate && ret >= 0) { 1711 s->block_inactive = true; 1712 } 1713 } 1714 qemu_mutex_unlock_iothread(); 1715 1716 if (ret < 0) { 1717 goto fail; 1718 } 1719 } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { 1720 trace_migration_completion_postcopy_end(); 1721 1722 qemu_savevm_state_complete_postcopy(s->to_dst_file); 1723 trace_migration_completion_postcopy_end_after_complete(); 1724 } 1725 1726 /* 1727 * If rp was opened we must clean up the thread before 1728 * cleaning everything else up (since if there are no failures 1729 * it will wait for the destination to send it's status in 1730 * a SHUT command). 1731 */ 1732 if (s->rp_state.from_dst_file) { 1733 int rp_error; 1734 trace_migration_return_path_end_before(); 1735 rp_error = await_return_path_close_on_source(s); 1736 trace_migration_return_path_end_after(rp_error); 1737 if (rp_error) { 1738 goto fail_invalidate; 1739 } 1740 } 1741 1742 if (qemu_file_get_error(s->to_dst_file)) { 1743 trace_migration_completion_file_err(); 1744 goto fail_invalidate; 1745 } 1746 1747 if (!migrate_colo_enabled()) { 1748 migrate_set_state(&s->state, current_active_state, 1749 MIGRATION_STATUS_COMPLETED); 1750 } 1751 1752 return; 1753 1754 fail_invalidate: 1755 /* If not doing postcopy, vm_start() will be called: let's regain 1756 * control on images. 1757 */ 1758 if (s->state == MIGRATION_STATUS_ACTIVE) { 1759 Error *local_err = NULL; 1760 1761 qemu_mutex_lock_iothread(); 1762 bdrv_invalidate_cache_all(&local_err); 1763 if (local_err) { 1764 error_report_err(local_err); 1765 } else { 1766 s->block_inactive = false; 1767 } 1768 qemu_mutex_unlock_iothread(); 1769 } 1770 1771 fail: 1772 migrate_set_state(&s->state, current_active_state, 1773 MIGRATION_STATUS_FAILED); 1774 } 1775 1776 bool migrate_colo_enabled(void) 1777 { 1778 MigrationState *s = migrate_get_current(); 1779 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO]; 1780 } 1781 1782 /* 1783 * Master migration thread on the source VM. 1784 * It drives the migration and pumps the data down the outgoing channel. 1785 */ 1786 static void *migration_thread(void *opaque) 1787 { 1788 MigrationState *s = opaque; 1789 /* Used by the bandwidth calcs, updated later */ 1790 int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 1791 int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); 1792 int64_t initial_bytes = 0; 1793 /* 1794 * The final stage happens when the remaining data is smaller than 1795 * this threshold; it's calculated from the requested downtime and 1796 * measured bandwidth 1797 */ 1798 int64_t threshold_size = 0; 1799 int64_t start_time = initial_time; 1800 int64_t end_time; 1801 bool old_vm_running = false; 1802 bool entered_postcopy = false; 1803 /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */ 1804 enum MigrationStatus current_active_state = MIGRATION_STATUS_ACTIVE; 1805 bool enable_colo = migrate_colo_enabled(); 1806 1807 rcu_register_thread(); 1808 1809 qemu_savevm_state_header(s->to_dst_file); 1810 1811 /* 1812 * If we opened the return path, we need to make sure dst has it 1813 * opened as well. 1814 */ 1815 if (s->rp_state.from_dst_file) { 1816 /* Now tell the dest that it should open its end so it can reply */ 1817 qemu_savevm_send_open_return_path(s->to_dst_file); 1818 1819 /* And do a ping that will make stuff easier to debug */ 1820 qemu_savevm_send_ping(s->to_dst_file, 1); 1821 } 1822 1823 if (migrate_postcopy_ram()) { 1824 /* 1825 * Tell the destination that we *might* want to do postcopy later; 1826 * if the other end can't do postcopy it should fail now, nice and 1827 * early. 1828 */ 1829 qemu_savevm_send_postcopy_advise(s->to_dst_file); 1830 } 1831 1832 qemu_savevm_state_setup(s->to_dst_file); 1833 1834 s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; 1835 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 1836 MIGRATION_STATUS_ACTIVE); 1837 1838 trace_migration_thread_setup_complete(); 1839 1840 while (s->state == MIGRATION_STATUS_ACTIVE || 1841 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { 1842 int64_t current_time; 1843 uint64_t pending_size; 1844 1845 if (!qemu_file_rate_limit(s->to_dst_file)) { 1846 uint64_t pend_post, pend_nonpost; 1847 1848 qemu_savevm_state_pending(s->to_dst_file, threshold_size, 1849 &pend_nonpost, &pend_post); 1850 pending_size = pend_nonpost + pend_post; 1851 trace_migrate_pending(pending_size, threshold_size, 1852 pend_post, pend_nonpost); 1853 if (pending_size && pending_size >= threshold_size) { 1854 /* Still a significant amount to transfer */ 1855 1856 if (migrate_postcopy_ram() && 1857 s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE && 1858 pend_nonpost <= threshold_size && 1859 atomic_read(&s->start_postcopy)) { 1860 1861 if (!postcopy_start(s, &old_vm_running)) { 1862 current_active_state = MIGRATION_STATUS_POSTCOPY_ACTIVE; 1863 entered_postcopy = true; 1864 } 1865 1866 continue; 1867 } 1868 /* Just another iteration step */ 1869 qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy); 1870 } else { 1871 trace_migration_thread_low_pending(pending_size); 1872 migration_completion(s, current_active_state, 1873 &old_vm_running, &start_time); 1874 break; 1875 } 1876 } 1877 1878 if (qemu_file_get_error(s->to_dst_file)) { 1879 migrate_set_state(&s->state, current_active_state, 1880 MIGRATION_STATUS_FAILED); 1881 trace_migration_thread_file_err(); 1882 break; 1883 } 1884 current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 1885 if (current_time >= initial_time + BUFFER_DELAY) { 1886 uint64_t transferred_bytes = qemu_ftell(s->to_dst_file) - 1887 initial_bytes; 1888 uint64_t time_spent = current_time - initial_time; 1889 double bandwidth = (double)transferred_bytes / time_spent; 1890 threshold_size = bandwidth * s->parameters.downtime_limit; 1891 1892 s->mbps = (((double) transferred_bytes * 8.0) / 1893 ((double) time_spent / 1000.0)) / 1000.0 / 1000.0; 1894 1895 trace_migrate_transferred(transferred_bytes, time_spent, 1896 bandwidth, threshold_size); 1897 /* if we haven't sent anything, we don't want to recalculate 1898 10000 is a small enough number for our purposes */ 1899 if (ram_counters.dirty_pages_rate && transferred_bytes > 10000) { 1900 s->expected_downtime = ram_counters.dirty_pages_rate * 1901 qemu_target_page_size() / bandwidth; 1902 } 1903 1904 qemu_file_reset_rate_limit(s->to_dst_file); 1905 initial_time = current_time; 1906 initial_bytes = qemu_ftell(s->to_dst_file); 1907 } 1908 if (qemu_file_rate_limit(s->to_dst_file)) { 1909 /* usleep expects microseconds */ 1910 g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); 1911 } 1912 } 1913 1914 trace_migration_thread_after_loop(); 1915 /* If we enabled cpu throttling for auto-converge, turn it off. */ 1916 cpu_throttle_stop(); 1917 end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 1918 1919 qemu_mutex_lock_iothread(); 1920 /* 1921 * The resource has been allocated by migration will be reused in COLO 1922 * process, so don't release them. 1923 */ 1924 if (!enable_colo) { 1925 qemu_savevm_state_cleanup(); 1926 } 1927 if (s->state == MIGRATION_STATUS_COMPLETED) { 1928 uint64_t transferred_bytes = qemu_ftell(s->to_dst_file); 1929 s->total_time = end_time - s->total_time; 1930 if (!entered_postcopy) { 1931 s->downtime = end_time - start_time; 1932 } 1933 if (s->total_time) { 1934 s->mbps = (((double) transferred_bytes * 8.0) / 1935 ((double) s->total_time)) / 1000; 1936 } 1937 runstate_set(RUN_STATE_POSTMIGRATE); 1938 } else { 1939 if (s->state == MIGRATION_STATUS_ACTIVE && enable_colo) { 1940 migrate_start_colo_process(s); 1941 qemu_savevm_state_cleanup(); 1942 /* 1943 * Fixme: we will run VM in COLO no matter its old running state. 1944 * After exited COLO, we will keep running. 1945 */ 1946 old_vm_running = true; 1947 } 1948 if (old_vm_running && !entered_postcopy) { 1949 vm_start(); 1950 } else { 1951 if (runstate_check(RUN_STATE_FINISH_MIGRATE)) { 1952 runstate_set(RUN_STATE_POSTMIGRATE); 1953 } 1954 } 1955 } 1956 qemu_bh_schedule(s->cleanup_bh); 1957 qemu_mutex_unlock_iothread(); 1958 1959 rcu_unregister_thread(); 1960 return NULL; 1961 } 1962 1963 void migrate_fd_connect(MigrationState *s) 1964 { 1965 s->expected_downtime = s->parameters.downtime_limit; 1966 s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); 1967 1968 qemu_file_set_blocking(s->to_dst_file, true); 1969 qemu_file_set_rate_limit(s->to_dst_file, 1970 s->parameters.max_bandwidth / XFER_LIMIT_RATIO); 1971 1972 /* Notify before starting migration thread */ 1973 notifier_list_notify(&migration_state_notifiers, s); 1974 1975 /* 1976 * Open the return path. For postcopy, it is used exclusively. For 1977 * precopy, only if user specified "return-path" capability would 1978 * QEMU uses the return path. 1979 */ 1980 if (migrate_postcopy_ram() || migrate_use_return_path()) { 1981 if (open_return_path_on_source(s)) { 1982 error_report("Unable to open return-path for postcopy"); 1983 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 1984 MIGRATION_STATUS_FAILED); 1985 migrate_fd_cleanup(s); 1986 return; 1987 } 1988 } 1989 1990 qemu_thread_create(&s->thread, "live_migration", migration_thread, s, 1991 QEMU_THREAD_JOINABLE); 1992 s->migration_thread_running = true; 1993 } 1994 1995 void migration_global_dump(Monitor *mon) 1996 { 1997 MigrationState *ms = migrate_get_current(); 1998 1999 monitor_printf(mon, "globals: store-global-state=%d, only_migratable=%d, " 2000 "send-configuration=%d, send-section-footer=%d\n", 2001 ms->store_global_state, ms->only_migratable, 2002 ms->send_configuration, ms->send_section_footer); 2003 } 2004 2005 static Property migration_properties[] = { 2006 DEFINE_PROP_BOOL("store-global-state", MigrationState, 2007 store_global_state, true), 2008 DEFINE_PROP_BOOL("only-migratable", MigrationState, only_migratable, false), 2009 DEFINE_PROP_BOOL("send-configuration", MigrationState, 2010 send_configuration, true), 2011 DEFINE_PROP_BOOL("send-section-footer", MigrationState, 2012 send_section_footer, true), 2013 DEFINE_PROP_END_OF_LIST(), 2014 }; 2015 2016 static void migration_class_init(ObjectClass *klass, void *data) 2017 { 2018 DeviceClass *dc = DEVICE_CLASS(klass); 2019 2020 dc->user_creatable = false; 2021 dc->props = migration_properties; 2022 } 2023 2024 static void migration_instance_init(Object *obj) 2025 { 2026 MigrationState *ms = MIGRATION_OBJ(obj); 2027 2028 ms->state = MIGRATION_STATUS_NONE; 2029 ms->xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE; 2030 ms->mbps = -1; 2031 ms->parameters = (MigrationParameters) { 2032 .compress_level = DEFAULT_MIGRATE_COMPRESS_LEVEL, 2033 .compress_threads = DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT, 2034 .decompress_threads = DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT, 2035 .cpu_throttle_initial = DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL, 2036 .cpu_throttle_increment = DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT, 2037 .max_bandwidth = MAX_THROTTLE, 2038 .downtime_limit = DEFAULT_MIGRATE_SET_DOWNTIME, 2039 .x_checkpoint_delay = DEFAULT_MIGRATE_X_CHECKPOINT_DELAY, 2040 }; 2041 ms->parameters.tls_creds = g_strdup(""); 2042 ms->parameters.tls_hostname = g_strdup(""); 2043 } 2044 2045 static const TypeInfo migration_type = { 2046 .name = TYPE_MIGRATION, 2047 /* 2048 * NOTE: TYPE_MIGRATION is not really a device, as the object is 2049 * not created using qdev_create(), it is not attached to the qdev 2050 * device tree, and it is never realized. 2051 * 2052 * TODO: Make this TYPE_OBJECT once QOM provides something like 2053 * TYPE_DEVICE's "-global" properties. 2054 */ 2055 .parent = TYPE_DEVICE, 2056 .class_init = migration_class_init, 2057 .class_size = sizeof(MigrationClass), 2058 .instance_size = sizeof(MigrationState), 2059 .instance_init = migration_instance_init, 2060 }; 2061 2062 static void register_migration_types(void) 2063 { 2064 type_register_static(&migration_type); 2065 } 2066 2067 type_init(register_migration_types); 2068