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 "exec.h" 22 #include "fd.h" 23 #include "socket.h" 24 #include "sysemu/runstate.h" 25 #include "sysemu/sysemu.h" 26 #include "rdma.h" 27 #include "ram.h" 28 #include "migration/global_state.h" 29 #include "migration/misc.h" 30 #include "migration.h" 31 #include "savevm.h" 32 #include "qemu-file-channel.h" 33 #include "qemu-file.h" 34 #include "migration/vmstate.h" 35 #include "block/block.h" 36 #include "qapi/error.h" 37 #include "qapi/clone-visitor.h" 38 #include "qapi/qapi-visit-sockets.h" 39 #include "qapi/qapi-commands-migration.h" 40 #include "qapi/qapi-events-migration.h" 41 #include "qapi/qmp/qerror.h" 42 #include "qapi/qmp/qnull.h" 43 #include "qemu/rcu.h" 44 #include "block.h" 45 #include "postcopy-ram.h" 46 #include "qemu/thread.h" 47 #include "trace.h" 48 #include "exec/target_page.h" 49 #include "io/channel-buffer.h" 50 #include "migration/colo.h" 51 #include "hw/boards.h" 52 #include "hw/qdev-properties.h" 53 #include "monitor/monitor.h" 54 #include "net/announce.h" 55 56 #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ 57 58 /* Amount of time to allocate to each "chunk" of bandwidth-throttled 59 * data. */ 60 #define BUFFER_DELAY 100 61 #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) 62 63 /* Time in milliseconds we are allowed to stop the source, 64 * for sending the last part */ 65 #define DEFAULT_MIGRATE_SET_DOWNTIME 300 66 67 /* Maximum migrate downtime set to 2000 seconds */ 68 #define MAX_MIGRATE_DOWNTIME_SECONDS 2000 69 #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000) 70 71 /* Default compression thread count */ 72 #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 73 /* Default decompression thread count, usually decompression is at 74 * least 4 times as fast as compression.*/ 75 #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 76 /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ 77 #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 78 /* Define default autoconverge cpu throttle migration parameters */ 79 #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20 80 #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10 81 #define DEFAULT_MIGRATE_MAX_CPU_THROTTLE 99 82 83 /* Migration XBZRLE default cache size */ 84 #define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024) 85 86 /* The delay time (in ms) between two COLO checkpoints */ 87 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100) 88 #define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2 89 90 /* Background transfer rate for postcopy, 0 means unlimited, note 91 * that page requests can still exceed this limit. 92 */ 93 #define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0 94 95 /* 96 * Parameters for self_announce_delay giving a stream of RARP/ARP 97 * packets after migration. 98 */ 99 #define DEFAULT_MIGRATE_ANNOUNCE_INITIAL 50 100 #define DEFAULT_MIGRATE_ANNOUNCE_MAX 550 101 #define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS 5 102 #define DEFAULT_MIGRATE_ANNOUNCE_STEP 100 103 104 static NotifierList migration_state_notifiers = 105 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); 106 107 static bool deferred_incoming; 108 109 /* Messages sent on the return path from destination to source */ 110 enum mig_rp_message_type { 111 MIG_RP_MSG_INVALID = 0, /* Must be 0 */ 112 MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */ 113 MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */ 114 115 MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */ 116 MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */ 117 MIG_RP_MSG_RECV_BITMAP, /* send recved_bitmap back to source */ 118 MIG_RP_MSG_RESUME_ACK, /* tell source that we are ready to resume */ 119 120 MIG_RP_MSG_MAX 121 }; 122 123 /* When we add fault tolerance, we could have several 124 migrations at once. For now we don't need to add 125 dynamic creation of migration */ 126 127 static MigrationState *current_migration; 128 static MigrationIncomingState *current_incoming; 129 130 static bool migration_object_check(MigrationState *ms, Error **errp); 131 static int migration_maybe_pause(MigrationState *s, 132 int *current_active_state, 133 int new_state); 134 static void migrate_fd_cancel(MigrationState *s); 135 136 void migration_object_init(void) 137 { 138 MachineState *ms = MACHINE(qdev_get_machine()); 139 Error *err = NULL; 140 141 /* This can only be called once. */ 142 assert(!current_migration); 143 current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION)); 144 145 /* 146 * Init the migrate incoming object as well no matter whether 147 * we'll use it or not. 148 */ 149 assert(!current_incoming); 150 current_incoming = g_new0(MigrationIncomingState, 1); 151 current_incoming->state = MIGRATION_STATUS_NONE; 152 current_incoming->postcopy_remote_fds = 153 g_array_new(FALSE, TRUE, sizeof(struct PostCopyFD)); 154 qemu_mutex_init(¤t_incoming->rp_mutex); 155 qemu_event_init(¤t_incoming->main_thread_load_event, false); 156 qemu_sem_init(¤t_incoming->postcopy_pause_sem_dst, 0); 157 qemu_sem_init(¤t_incoming->postcopy_pause_sem_fault, 0); 158 159 init_dirty_bitmap_incoming_migration(); 160 161 if (!migration_object_check(current_migration, &err)) { 162 error_report_err(err); 163 exit(1); 164 } 165 166 /* 167 * We cannot really do this in migration_instance_init() since at 168 * that time global properties are not yet applied, then this 169 * value will be definitely replaced by something else. 170 */ 171 if (ms->enforce_config_section) { 172 current_migration->send_configuration = true; 173 } 174 } 175 176 void migration_shutdown(void) 177 { 178 /* 179 * Cancel the current migration - that will (eventually) 180 * stop the migration using this structure 181 */ 182 migrate_fd_cancel(current_migration); 183 object_unref(OBJECT(current_migration)); 184 } 185 186 /* For outgoing */ 187 MigrationState *migrate_get_current(void) 188 { 189 /* This can only be called after the object created. */ 190 assert(current_migration); 191 return current_migration; 192 } 193 194 MigrationIncomingState *migration_incoming_get_current(void) 195 { 196 assert(current_incoming); 197 return current_incoming; 198 } 199 200 void migration_incoming_state_destroy(void) 201 { 202 struct MigrationIncomingState *mis = migration_incoming_get_current(); 203 204 if (mis->to_src_file) { 205 /* Tell source that we are done */ 206 migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0); 207 qemu_fclose(mis->to_src_file); 208 mis->to_src_file = NULL; 209 } 210 211 if (mis->from_src_file) { 212 qemu_fclose(mis->from_src_file); 213 mis->from_src_file = NULL; 214 } 215 if (mis->postcopy_remote_fds) { 216 g_array_free(mis->postcopy_remote_fds, TRUE); 217 mis->postcopy_remote_fds = NULL; 218 } 219 220 qemu_event_reset(&mis->main_thread_load_event); 221 222 if (mis->socket_address_list) { 223 qapi_free_SocketAddressList(mis->socket_address_list); 224 mis->socket_address_list = NULL; 225 } 226 } 227 228 static void migrate_generate_event(int new_state) 229 { 230 if (migrate_use_events()) { 231 qapi_event_send_migration(new_state); 232 } 233 } 234 235 static bool migrate_late_block_activate(void) 236 { 237 MigrationState *s; 238 239 s = migrate_get_current(); 240 241 return s->enabled_capabilities[ 242 MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE]; 243 } 244 245 /* 246 * Called on -incoming with a defer: uri. 247 * The migration can be started later after any parameters have been 248 * changed. 249 */ 250 static void deferred_incoming_migration(Error **errp) 251 { 252 if (deferred_incoming) { 253 error_setg(errp, "Incoming migration already deferred"); 254 } 255 deferred_incoming = true; 256 } 257 258 /* 259 * Send a message on the return channel back to the source 260 * of the migration. 261 */ 262 static int migrate_send_rp_message(MigrationIncomingState *mis, 263 enum mig_rp_message_type message_type, 264 uint16_t len, void *data) 265 { 266 int ret = 0; 267 268 trace_migrate_send_rp_message((int)message_type, len); 269 qemu_mutex_lock(&mis->rp_mutex); 270 271 /* 272 * It's possible that the file handle got lost due to network 273 * failures. 274 */ 275 if (!mis->to_src_file) { 276 ret = -EIO; 277 goto error; 278 } 279 280 qemu_put_be16(mis->to_src_file, (unsigned int)message_type); 281 qemu_put_be16(mis->to_src_file, len); 282 qemu_put_buffer(mis->to_src_file, data, len); 283 qemu_fflush(mis->to_src_file); 284 285 /* It's possible that qemu file got error during sending */ 286 ret = qemu_file_get_error(mis->to_src_file); 287 288 error: 289 qemu_mutex_unlock(&mis->rp_mutex); 290 return ret; 291 } 292 293 /* Request a range of pages from the source VM at the given 294 * start address. 295 * rbname: Name of the RAMBlock to request the page in, if NULL it's the same 296 * as the last request (a name must have been given previously) 297 * Start: Address offset within the RB 298 * Len: Length in bytes required - must be a multiple of pagesize 299 */ 300 int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname, 301 ram_addr_t start, size_t len) 302 { 303 uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ 304 size_t msglen = 12; /* start + len */ 305 enum mig_rp_message_type msg_type; 306 307 *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); 308 *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); 309 310 if (rbname) { 311 int rbname_len = strlen(rbname); 312 assert(rbname_len < 256); 313 314 bufc[msglen++] = rbname_len; 315 memcpy(bufc + msglen, rbname, rbname_len); 316 msglen += rbname_len; 317 msg_type = MIG_RP_MSG_REQ_PAGES_ID; 318 } else { 319 msg_type = MIG_RP_MSG_REQ_PAGES; 320 } 321 322 return migrate_send_rp_message(mis, msg_type, msglen, bufc); 323 } 324 325 static bool migration_colo_enabled; 326 bool migration_incoming_colo_enabled(void) 327 { 328 return migration_colo_enabled; 329 } 330 331 void migration_incoming_disable_colo(void) 332 { 333 migration_colo_enabled = false; 334 } 335 336 void migration_incoming_enable_colo(void) 337 { 338 migration_colo_enabled = true; 339 } 340 341 void migrate_add_address(SocketAddress *address) 342 { 343 MigrationIncomingState *mis = migration_incoming_get_current(); 344 SocketAddressList *addrs; 345 346 addrs = g_new0(SocketAddressList, 1); 347 addrs->next = mis->socket_address_list; 348 mis->socket_address_list = addrs; 349 addrs->value = QAPI_CLONE(SocketAddress, address); 350 } 351 352 void qemu_start_incoming_migration(const char *uri, Error **errp) 353 { 354 const char *p; 355 356 qapi_event_send_migration(MIGRATION_STATUS_SETUP); 357 if (!strcmp(uri, "defer")) { 358 deferred_incoming_migration(errp); 359 } else if (strstart(uri, "tcp:", &p)) { 360 tcp_start_incoming_migration(p, errp); 361 #ifdef CONFIG_RDMA 362 } else if (strstart(uri, "rdma:", &p)) { 363 rdma_start_incoming_migration(p, errp); 364 #endif 365 } else if (strstart(uri, "exec:", &p)) { 366 exec_start_incoming_migration(p, errp); 367 } else if (strstart(uri, "unix:", &p)) { 368 unix_start_incoming_migration(p, errp); 369 } else if (strstart(uri, "fd:", &p)) { 370 fd_start_incoming_migration(p, errp); 371 } else { 372 error_setg(errp, "unknown migration protocol: %s", uri); 373 } 374 } 375 376 static void process_incoming_migration_bh(void *opaque) 377 { 378 Error *local_err = NULL; 379 MigrationIncomingState *mis = opaque; 380 381 /* If capability late_block_activate is set: 382 * Only fire up the block code now if we're going to restart the 383 * VM, else 'cont' will do it. 384 * This causes file locking to happen; so we don't want it to happen 385 * unless we really are starting the VM. 386 */ 387 if (!migrate_late_block_activate() || 388 (autostart && (!global_state_received() || 389 global_state_get_runstate() == RUN_STATE_RUNNING))) { 390 /* Make sure all file formats flush their mutable metadata. 391 * If we get an error here, just don't restart the VM yet. */ 392 bdrv_invalidate_cache_all(&local_err); 393 if (local_err) { 394 error_report_err(local_err); 395 local_err = NULL; 396 autostart = false; 397 } 398 } 399 400 /* 401 * This must happen after all error conditions are dealt with and 402 * we're sure the VM is going to be running on this host. 403 */ 404 qemu_announce_self(&mis->announce_timer, migrate_announce_params()); 405 406 if (multifd_load_cleanup(&local_err) != 0) { 407 error_report_err(local_err); 408 autostart = false; 409 } 410 /* If global state section was not received or we are in running 411 state, we need to obey autostart. Any other state is set with 412 runstate_set. */ 413 414 dirty_bitmap_mig_before_vm_start(); 415 416 if (!global_state_received() || 417 global_state_get_runstate() == RUN_STATE_RUNNING) { 418 if (autostart) { 419 vm_start(); 420 } else { 421 runstate_set(RUN_STATE_PAUSED); 422 } 423 } else if (migration_incoming_colo_enabled()) { 424 migration_incoming_disable_colo(); 425 vm_start(); 426 } else { 427 runstate_set(global_state_get_runstate()); 428 } 429 /* 430 * This must happen after any state changes since as soon as an external 431 * observer sees this event they might start to prod at the VM assuming 432 * it's ready to use. 433 */ 434 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, 435 MIGRATION_STATUS_COMPLETED); 436 qemu_bh_delete(mis->bh); 437 migration_incoming_state_destroy(); 438 } 439 440 static void process_incoming_migration_co(void *opaque) 441 { 442 MigrationIncomingState *mis = migration_incoming_get_current(); 443 PostcopyState ps; 444 int ret; 445 Error *local_err = NULL; 446 447 assert(mis->from_src_file); 448 mis->migration_incoming_co = qemu_coroutine_self(); 449 mis->largest_page_size = qemu_ram_pagesize_largest(); 450 postcopy_state_set(POSTCOPY_INCOMING_NONE); 451 migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, 452 MIGRATION_STATUS_ACTIVE); 453 ret = qemu_loadvm_state(mis->from_src_file); 454 455 ps = postcopy_state_get(); 456 trace_process_incoming_migration_co_end(ret, ps); 457 if (ps != POSTCOPY_INCOMING_NONE) { 458 if (ps == POSTCOPY_INCOMING_ADVISE) { 459 /* 460 * Where a migration had postcopy enabled (and thus went to advise) 461 * but managed to complete within the precopy period, we can use 462 * the normal exit. 463 */ 464 postcopy_ram_incoming_cleanup(mis); 465 } else if (ret >= 0) { 466 /* 467 * Postcopy was started, cleanup should happen at the end of the 468 * postcopy thread. 469 */ 470 trace_process_incoming_migration_co_postcopy_end_main(); 471 return; 472 } 473 /* Else if something went wrong then just fall out of the normal exit */ 474 } 475 476 /* we get COLO info, and know if we are in COLO mode */ 477 if (!ret && migration_incoming_colo_enabled()) { 478 /* Make sure all file formats flush their mutable metadata */ 479 bdrv_invalidate_cache_all(&local_err); 480 if (local_err) { 481 error_report_err(local_err); 482 goto fail; 483 } 484 485 if (colo_init_ram_cache() < 0) { 486 error_report("Init ram cache failed"); 487 goto fail; 488 } 489 490 qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming", 491 colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE); 492 mis->have_colo_incoming_thread = true; 493 qemu_coroutine_yield(); 494 495 /* Wait checkpoint incoming thread exit before free resource */ 496 qemu_thread_join(&mis->colo_incoming_thread); 497 /* We hold the global iothread lock, so it is safe here */ 498 colo_release_ram_cache(); 499 } 500 501 if (ret < 0) { 502 error_report("load of migration failed: %s", strerror(-ret)); 503 goto fail; 504 } 505 mis->bh = qemu_bh_new(process_incoming_migration_bh, mis); 506 qemu_bh_schedule(mis->bh); 507 mis->migration_incoming_co = NULL; 508 return; 509 fail: 510 local_err = NULL; 511 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, 512 MIGRATION_STATUS_FAILED); 513 qemu_fclose(mis->from_src_file); 514 if (multifd_load_cleanup(&local_err) != 0) { 515 error_report_err(local_err); 516 } 517 exit(EXIT_FAILURE); 518 } 519 520 static void migration_incoming_setup(QEMUFile *f) 521 { 522 MigrationIncomingState *mis = migration_incoming_get_current(); 523 524 if (multifd_load_setup() != 0) { 525 /* We haven't been able to create multifd threads 526 nothing better to do */ 527 exit(EXIT_FAILURE); 528 } 529 530 if (!mis->from_src_file) { 531 mis->from_src_file = f; 532 } 533 qemu_file_set_blocking(f, false); 534 } 535 536 void migration_incoming_process(void) 537 { 538 Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL); 539 qemu_coroutine_enter(co); 540 } 541 542 /* Returns true if recovered from a paused migration, otherwise false */ 543 static bool postcopy_try_recover(QEMUFile *f) 544 { 545 MigrationIncomingState *mis = migration_incoming_get_current(); 546 547 if (mis->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { 548 /* Resumed from a paused postcopy migration */ 549 550 mis->from_src_file = f; 551 /* Postcopy has standalone thread to do vm load */ 552 qemu_file_set_blocking(f, true); 553 554 /* Re-configure the return path */ 555 mis->to_src_file = qemu_file_get_return_path(f); 556 557 migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_PAUSED, 558 MIGRATION_STATUS_POSTCOPY_RECOVER); 559 560 /* 561 * Here, we only wake up the main loading thread (while the 562 * fault thread will still be waiting), so that we can receive 563 * commands from source now, and answer it if needed. The 564 * fault thread will be woken up afterwards until we are sure 565 * that source is ready to reply to page requests. 566 */ 567 qemu_sem_post(&mis->postcopy_pause_sem_dst); 568 return true; 569 } 570 571 return false; 572 } 573 574 void migration_fd_process_incoming(QEMUFile *f) 575 { 576 if (postcopy_try_recover(f)) { 577 return; 578 } 579 580 migration_incoming_setup(f); 581 migration_incoming_process(); 582 } 583 584 void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp) 585 { 586 MigrationIncomingState *mis = migration_incoming_get_current(); 587 bool start_migration; 588 589 if (!mis->from_src_file) { 590 /* The first connection (multifd may have multiple) */ 591 QEMUFile *f = qemu_fopen_channel_input(ioc); 592 593 /* If it's a recovery, we're done */ 594 if (postcopy_try_recover(f)) { 595 return; 596 } 597 598 migration_incoming_setup(f); 599 600 /* 601 * Common migration only needs one channel, so we can start 602 * right now. Multifd needs more than one channel, we wait. 603 */ 604 start_migration = !migrate_use_multifd(); 605 } else { 606 Error *local_err = NULL; 607 /* Multiple connections */ 608 assert(migrate_use_multifd()); 609 start_migration = multifd_recv_new_channel(ioc, &local_err); 610 if (local_err) { 611 error_propagate(errp, local_err); 612 return; 613 } 614 } 615 616 if (start_migration) { 617 migration_incoming_process(); 618 } 619 } 620 621 /** 622 * @migration_has_all_channels: We have received all channels that we need 623 * 624 * Returns true when we have got connections to all the channels that 625 * we need for migration. 626 */ 627 bool migration_has_all_channels(void) 628 { 629 MigrationIncomingState *mis = migration_incoming_get_current(); 630 bool all_channels; 631 632 all_channels = multifd_recv_all_channels_created(); 633 634 return all_channels && mis->from_src_file != NULL; 635 } 636 637 /* 638 * Send a 'SHUT' message on the return channel with the given value 639 * to indicate that we've finished with the RP. Non-0 value indicates 640 * error. 641 */ 642 void migrate_send_rp_shut(MigrationIncomingState *mis, 643 uint32_t value) 644 { 645 uint32_t buf; 646 647 buf = cpu_to_be32(value); 648 migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); 649 } 650 651 /* 652 * Send a 'PONG' message on the return channel with the given value 653 * (normally in response to a 'PING') 654 */ 655 void migrate_send_rp_pong(MigrationIncomingState *mis, 656 uint32_t value) 657 { 658 uint32_t buf; 659 660 buf = cpu_to_be32(value); 661 migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); 662 } 663 664 void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis, 665 char *block_name) 666 { 667 char buf[512]; 668 int len; 669 int64_t res; 670 671 /* 672 * First, we send the header part. It contains only the len of 673 * idstr, and the idstr itself. 674 */ 675 len = strlen(block_name); 676 buf[0] = len; 677 memcpy(buf + 1, block_name, len); 678 679 if (mis->state != MIGRATION_STATUS_POSTCOPY_RECOVER) { 680 error_report("%s: MSG_RP_RECV_BITMAP only used for recovery", 681 __func__); 682 return; 683 } 684 685 migrate_send_rp_message(mis, MIG_RP_MSG_RECV_BITMAP, len + 1, buf); 686 687 /* 688 * Next, we dump the received bitmap to the stream. 689 * 690 * TODO: currently we are safe since we are the only one that is 691 * using the to_src_file handle (fault thread is still paused), 692 * and it's ok even not taking the mutex. However the best way is 693 * to take the lock before sending the message header, and release 694 * the lock after sending the bitmap. 695 */ 696 qemu_mutex_lock(&mis->rp_mutex); 697 res = ramblock_recv_bitmap_send(mis->to_src_file, block_name); 698 qemu_mutex_unlock(&mis->rp_mutex); 699 700 trace_migrate_send_rp_recv_bitmap(block_name, res); 701 } 702 703 void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value) 704 { 705 uint32_t buf; 706 707 buf = cpu_to_be32(value); 708 migrate_send_rp_message(mis, MIG_RP_MSG_RESUME_ACK, sizeof(buf), &buf); 709 } 710 711 MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) 712 { 713 MigrationCapabilityStatusList *head = NULL; 714 MigrationCapabilityStatusList *caps; 715 MigrationState *s = migrate_get_current(); 716 int i; 717 718 caps = NULL; /* silence compiler warning */ 719 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { 720 #ifndef CONFIG_LIVE_BLOCK_MIGRATION 721 if (i == MIGRATION_CAPABILITY_BLOCK) { 722 continue; 723 } 724 #endif 725 if (head == NULL) { 726 head = g_malloc0(sizeof(*caps)); 727 caps = head; 728 } else { 729 caps->next = g_malloc0(sizeof(*caps)); 730 caps = caps->next; 731 } 732 caps->value = 733 g_malloc(sizeof(*caps->value)); 734 caps->value->capability = i; 735 caps->value->state = s->enabled_capabilities[i]; 736 } 737 738 return head; 739 } 740 741 MigrationParameters *qmp_query_migrate_parameters(Error **errp) 742 { 743 MigrationParameters *params; 744 MigrationState *s = migrate_get_current(); 745 746 /* TODO use QAPI_CLONE() instead of duplicating it inline */ 747 params = g_malloc0(sizeof(*params)); 748 params->has_compress_level = true; 749 params->compress_level = s->parameters.compress_level; 750 params->has_compress_threads = true; 751 params->compress_threads = s->parameters.compress_threads; 752 params->has_compress_wait_thread = true; 753 params->compress_wait_thread = s->parameters.compress_wait_thread; 754 params->has_decompress_threads = true; 755 params->decompress_threads = s->parameters.decompress_threads; 756 params->has_cpu_throttle_initial = true; 757 params->cpu_throttle_initial = s->parameters.cpu_throttle_initial; 758 params->has_cpu_throttle_increment = true; 759 params->cpu_throttle_increment = s->parameters.cpu_throttle_increment; 760 params->has_tls_creds = true; 761 params->tls_creds = g_strdup(s->parameters.tls_creds); 762 params->has_tls_hostname = true; 763 params->tls_hostname = g_strdup(s->parameters.tls_hostname); 764 params->has_tls_authz = true; 765 params->tls_authz = g_strdup(s->parameters.tls_authz); 766 params->has_max_bandwidth = true; 767 params->max_bandwidth = s->parameters.max_bandwidth; 768 params->has_downtime_limit = true; 769 params->downtime_limit = s->parameters.downtime_limit; 770 params->has_x_checkpoint_delay = true; 771 params->x_checkpoint_delay = s->parameters.x_checkpoint_delay; 772 params->has_block_incremental = true; 773 params->block_incremental = s->parameters.block_incremental; 774 params->has_multifd_channels = true; 775 params->multifd_channels = s->parameters.multifd_channels; 776 params->has_xbzrle_cache_size = true; 777 params->xbzrle_cache_size = s->parameters.xbzrle_cache_size; 778 params->has_max_postcopy_bandwidth = true; 779 params->max_postcopy_bandwidth = s->parameters.max_postcopy_bandwidth; 780 params->has_max_cpu_throttle = true; 781 params->max_cpu_throttle = s->parameters.max_cpu_throttle; 782 params->has_announce_initial = true; 783 params->announce_initial = s->parameters.announce_initial; 784 params->has_announce_max = true; 785 params->announce_max = s->parameters.announce_max; 786 params->has_announce_rounds = true; 787 params->announce_rounds = s->parameters.announce_rounds; 788 params->has_announce_step = true; 789 params->announce_step = s->parameters.announce_step; 790 791 return params; 792 } 793 794 AnnounceParameters *migrate_announce_params(void) 795 { 796 static AnnounceParameters ap; 797 798 MigrationState *s = migrate_get_current(); 799 800 ap.initial = s->parameters.announce_initial; 801 ap.max = s->parameters.announce_max; 802 ap.rounds = s->parameters.announce_rounds; 803 ap.step = s->parameters.announce_step; 804 805 return ≈ 806 } 807 808 /* 809 * Return true if we're already in the middle of a migration 810 * (i.e. any of the active or setup states) 811 */ 812 bool migration_is_setup_or_active(int state) 813 { 814 switch (state) { 815 case MIGRATION_STATUS_ACTIVE: 816 case MIGRATION_STATUS_POSTCOPY_ACTIVE: 817 case MIGRATION_STATUS_POSTCOPY_PAUSED: 818 case MIGRATION_STATUS_POSTCOPY_RECOVER: 819 case MIGRATION_STATUS_SETUP: 820 case MIGRATION_STATUS_PRE_SWITCHOVER: 821 case MIGRATION_STATUS_DEVICE: 822 return true; 823 824 default: 825 return false; 826 827 } 828 } 829 830 static void populate_ram_info(MigrationInfo *info, MigrationState *s) 831 { 832 info->has_ram = true; 833 info->ram = g_malloc0(sizeof(*info->ram)); 834 info->ram->transferred = ram_counters.transferred; 835 info->ram->total = ram_bytes_total(); 836 info->ram->duplicate = ram_counters.duplicate; 837 /* legacy value. It is not used anymore */ 838 info->ram->skipped = 0; 839 info->ram->normal = ram_counters.normal; 840 info->ram->normal_bytes = ram_counters.normal * 841 qemu_target_page_size(); 842 info->ram->mbps = s->mbps; 843 info->ram->dirty_sync_count = ram_counters.dirty_sync_count; 844 info->ram->postcopy_requests = ram_counters.postcopy_requests; 845 info->ram->page_size = qemu_target_page_size(); 846 info->ram->multifd_bytes = ram_counters.multifd_bytes; 847 info->ram->pages_per_second = s->pages_per_second; 848 849 if (migrate_use_xbzrle()) { 850 info->has_xbzrle_cache = true; 851 info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); 852 info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); 853 info->xbzrle_cache->bytes = xbzrle_counters.bytes; 854 info->xbzrle_cache->pages = xbzrle_counters.pages; 855 info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss; 856 info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate; 857 info->xbzrle_cache->overflow = xbzrle_counters.overflow; 858 } 859 860 if (migrate_use_compression()) { 861 info->has_compression = true; 862 info->compression = g_malloc0(sizeof(*info->compression)); 863 info->compression->pages = compression_counters.pages; 864 info->compression->busy = compression_counters.busy; 865 info->compression->busy_rate = compression_counters.busy_rate; 866 info->compression->compressed_size = 867 compression_counters.compressed_size; 868 info->compression->compression_rate = 869 compression_counters.compression_rate; 870 } 871 872 if (cpu_throttle_active()) { 873 info->has_cpu_throttle_percentage = true; 874 info->cpu_throttle_percentage = cpu_throttle_get_percentage(); 875 } 876 877 if (s->state != MIGRATION_STATUS_COMPLETED) { 878 info->ram->remaining = ram_bytes_remaining(); 879 info->ram->dirty_pages_rate = ram_counters.dirty_pages_rate; 880 } 881 } 882 883 static void populate_disk_info(MigrationInfo *info) 884 { 885 if (blk_mig_active()) { 886 info->has_disk = true; 887 info->disk = g_malloc0(sizeof(*info->disk)); 888 info->disk->transferred = blk_mig_bytes_transferred(); 889 info->disk->remaining = blk_mig_bytes_remaining(); 890 info->disk->total = blk_mig_bytes_total(); 891 } 892 } 893 894 static void fill_source_migration_info(MigrationInfo *info) 895 { 896 MigrationState *s = migrate_get_current(); 897 898 switch (s->state) { 899 case MIGRATION_STATUS_NONE: 900 /* no migration has happened ever */ 901 /* do not overwrite destination migration status */ 902 return; 903 break; 904 case MIGRATION_STATUS_SETUP: 905 info->has_status = true; 906 info->has_total_time = false; 907 break; 908 case MIGRATION_STATUS_ACTIVE: 909 case MIGRATION_STATUS_CANCELLING: 910 case MIGRATION_STATUS_POSTCOPY_ACTIVE: 911 case MIGRATION_STATUS_PRE_SWITCHOVER: 912 case MIGRATION_STATUS_DEVICE: 913 case MIGRATION_STATUS_POSTCOPY_PAUSED: 914 case MIGRATION_STATUS_POSTCOPY_RECOVER: 915 /* TODO add some postcopy stats */ 916 info->has_status = true; 917 info->has_total_time = true; 918 info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) 919 - s->start_time; 920 info->has_expected_downtime = true; 921 info->expected_downtime = s->expected_downtime; 922 info->has_setup_time = true; 923 info->setup_time = s->setup_time; 924 925 populate_ram_info(info, s); 926 populate_disk_info(info); 927 break; 928 case MIGRATION_STATUS_COLO: 929 info->has_status = true; 930 /* TODO: display COLO specific information (checkpoint info etc.) */ 931 break; 932 case MIGRATION_STATUS_COMPLETED: 933 info->has_status = true; 934 info->has_total_time = true; 935 info->total_time = s->total_time; 936 info->has_downtime = true; 937 info->downtime = s->downtime; 938 info->has_setup_time = true; 939 info->setup_time = s->setup_time; 940 941 populate_ram_info(info, s); 942 break; 943 case MIGRATION_STATUS_FAILED: 944 info->has_status = true; 945 if (s->error) { 946 info->has_error_desc = true; 947 info->error_desc = g_strdup(error_get_pretty(s->error)); 948 } 949 break; 950 case MIGRATION_STATUS_CANCELLED: 951 info->has_status = true; 952 break; 953 } 954 info->status = s->state; 955 } 956 957 /** 958 * @migration_caps_check - check capability validity 959 * 960 * @cap_list: old capability list, array of bool 961 * @params: new capabilities to be applied soon 962 * @errp: set *errp if the check failed, with reason 963 * 964 * Returns true if check passed, otherwise false. 965 */ 966 static bool migrate_caps_check(bool *cap_list, 967 MigrationCapabilityStatusList *params, 968 Error **errp) 969 { 970 MigrationCapabilityStatusList *cap; 971 bool old_postcopy_cap; 972 MigrationIncomingState *mis = migration_incoming_get_current(); 973 974 old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]; 975 976 for (cap = params; cap; cap = cap->next) { 977 cap_list[cap->value->capability] = cap->value->state; 978 } 979 980 #ifndef CONFIG_LIVE_BLOCK_MIGRATION 981 if (cap_list[MIGRATION_CAPABILITY_BLOCK]) { 982 error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) " 983 "block migration"); 984 error_append_hint(errp, "Use drive_mirror+NBD instead.\n"); 985 return false; 986 } 987 #endif 988 989 #ifndef CONFIG_REPLICATION 990 if (cap_list[MIGRATION_CAPABILITY_X_COLO]) { 991 error_setg(errp, "QEMU compiled without replication module" 992 " can't enable COLO"); 993 error_append_hint(errp, "Please enable replication before COLO.\n"); 994 return false; 995 } 996 #endif 997 998 if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) { 999 if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) { 1000 /* The decompression threads asynchronously write into RAM 1001 * rather than use the atomic copies needed to avoid 1002 * userfaulting. It should be possible to fix the decompression 1003 * threads for compatibility in future. 1004 */ 1005 error_setg(errp, "Postcopy is not currently compatible " 1006 "with compression"); 1007 return false; 1008 } 1009 1010 /* This check is reasonably expensive, so only when it's being 1011 * set the first time, also it's only the destination that needs 1012 * special support. 1013 */ 1014 if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) && 1015 !postcopy_ram_supported_by_host(mis)) { 1016 /* postcopy_ram_supported_by_host will have emitted a more 1017 * detailed message 1018 */ 1019 error_setg(errp, "Postcopy is not supported"); 1020 return false; 1021 } 1022 1023 if (cap_list[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) { 1024 error_setg(errp, "Postcopy is not compatible with ignore-shared"); 1025 return false; 1026 } 1027 } 1028 1029 return true; 1030 } 1031 1032 static void fill_destination_migration_info(MigrationInfo *info) 1033 { 1034 MigrationIncomingState *mis = migration_incoming_get_current(); 1035 1036 if (mis->socket_address_list) { 1037 info->has_socket_address = true; 1038 info->socket_address = 1039 QAPI_CLONE(SocketAddressList, mis->socket_address_list); 1040 } 1041 1042 switch (mis->state) { 1043 case MIGRATION_STATUS_NONE: 1044 return; 1045 break; 1046 case MIGRATION_STATUS_SETUP: 1047 case MIGRATION_STATUS_CANCELLING: 1048 case MIGRATION_STATUS_CANCELLED: 1049 case MIGRATION_STATUS_ACTIVE: 1050 case MIGRATION_STATUS_POSTCOPY_ACTIVE: 1051 case MIGRATION_STATUS_POSTCOPY_PAUSED: 1052 case MIGRATION_STATUS_POSTCOPY_RECOVER: 1053 case MIGRATION_STATUS_FAILED: 1054 case MIGRATION_STATUS_COLO: 1055 info->has_status = true; 1056 break; 1057 case MIGRATION_STATUS_COMPLETED: 1058 info->has_status = true; 1059 fill_destination_postcopy_migration_info(info); 1060 break; 1061 } 1062 info->status = mis->state; 1063 } 1064 1065 MigrationInfo *qmp_query_migrate(Error **errp) 1066 { 1067 MigrationInfo *info = g_malloc0(sizeof(*info)); 1068 1069 fill_destination_migration_info(info); 1070 fill_source_migration_info(info); 1071 1072 return info; 1073 } 1074 1075 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, 1076 Error **errp) 1077 { 1078 MigrationState *s = migrate_get_current(); 1079 MigrationCapabilityStatusList *cap; 1080 bool cap_list[MIGRATION_CAPABILITY__MAX]; 1081 1082 if (migration_is_setup_or_active(s->state)) { 1083 error_setg(errp, QERR_MIGRATION_ACTIVE); 1084 return; 1085 } 1086 1087 memcpy(cap_list, s->enabled_capabilities, sizeof(cap_list)); 1088 if (!migrate_caps_check(cap_list, params, errp)) { 1089 return; 1090 } 1091 1092 for (cap = params; cap; cap = cap->next) { 1093 s->enabled_capabilities[cap->value->capability] = cap->value->state; 1094 } 1095 } 1096 1097 /* 1098 * Check whether the parameters are valid. Error will be put into errp 1099 * (if provided). Return true if valid, otherwise false. 1100 */ 1101 static bool migrate_params_check(MigrationParameters *params, Error **errp) 1102 { 1103 if (params->has_compress_level && 1104 (params->compress_level > 9)) { 1105 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level", 1106 "is invalid, it should be in the range of 0 to 9"); 1107 return false; 1108 } 1109 1110 if (params->has_compress_threads && (params->compress_threads < 1)) { 1111 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1112 "compress_threads", 1113 "is invalid, it should be in the range of 1 to 255"); 1114 return false; 1115 } 1116 1117 if (params->has_decompress_threads && (params->decompress_threads < 1)) { 1118 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1119 "decompress_threads", 1120 "is invalid, it should be in the range of 1 to 255"); 1121 return false; 1122 } 1123 1124 if (params->has_cpu_throttle_initial && 1125 (params->cpu_throttle_initial < 1 || 1126 params->cpu_throttle_initial > 99)) { 1127 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1128 "cpu_throttle_initial", 1129 "an integer in the range of 1 to 99"); 1130 return false; 1131 } 1132 1133 if (params->has_cpu_throttle_increment && 1134 (params->cpu_throttle_increment < 1 || 1135 params->cpu_throttle_increment > 99)) { 1136 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1137 "cpu_throttle_increment", 1138 "an integer in the range of 1 to 99"); 1139 return false; 1140 } 1141 1142 if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) { 1143 error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the" 1144 " range of 0 to %zu bytes/second", SIZE_MAX); 1145 return false; 1146 } 1147 1148 if (params->has_downtime_limit && 1149 (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) { 1150 error_setg(errp, "Parameter 'downtime_limit' expects an integer in " 1151 "the range of 0 to %d milliseconds", 1152 MAX_MIGRATE_DOWNTIME); 1153 return false; 1154 } 1155 1156 /* x_checkpoint_delay is now always positive */ 1157 1158 if (params->has_multifd_channels && (params->multifd_channels < 1)) { 1159 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1160 "multifd_channels", 1161 "is invalid, it should be in the range of 1 to 255"); 1162 return false; 1163 } 1164 1165 if (params->has_xbzrle_cache_size && 1166 (params->xbzrle_cache_size < qemu_target_page_size() || 1167 !is_power_of_2(params->xbzrle_cache_size))) { 1168 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1169 "xbzrle_cache_size", 1170 "is invalid, it should be bigger than target page size" 1171 " and a power of two"); 1172 return false; 1173 } 1174 1175 if (params->has_max_cpu_throttle && 1176 (params->max_cpu_throttle < params->cpu_throttle_initial || 1177 params->max_cpu_throttle > 99)) { 1178 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1179 "max_cpu_throttle", 1180 "an integer in the range of cpu_throttle_initial to 99"); 1181 return false; 1182 } 1183 1184 if (params->has_announce_initial && 1185 params->announce_initial > 100000) { 1186 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1187 "announce_initial", 1188 "is invalid, it must be less than 100000 ms"); 1189 return false; 1190 } 1191 if (params->has_announce_max && 1192 params->announce_max > 100000) { 1193 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1194 "announce_max", 1195 "is invalid, it must be less than 100000 ms"); 1196 return false; 1197 } 1198 if (params->has_announce_rounds && 1199 params->announce_rounds > 1000) { 1200 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1201 "announce_rounds", 1202 "is invalid, it must be in the range of 0 to 1000"); 1203 return false; 1204 } 1205 if (params->has_announce_step && 1206 (params->announce_step < 1 || 1207 params->announce_step > 10000)) { 1208 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1209 "announce_step", 1210 "is invalid, it must be in the range of 1 to 10000 ms"); 1211 return false; 1212 } 1213 return true; 1214 } 1215 1216 static void migrate_params_test_apply(MigrateSetParameters *params, 1217 MigrationParameters *dest) 1218 { 1219 *dest = migrate_get_current()->parameters; 1220 1221 /* TODO use QAPI_CLONE() instead of duplicating it inline */ 1222 1223 if (params->has_compress_level) { 1224 dest->compress_level = params->compress_level; 1225 } 1226 1227 if (params->has_compress_threads) { 1228 dest->compress_threads = params->compress_threads; 1229 } 1230 1231 if (params->has_compress_wait_thread) { 1232 dest->compress_wait_thread = params->compress_wait_thread; 1233 } 1234 1235 if (params->has_decompress_threads) { 1236 dest->decompress_threads = params->decompress_threads; 1237 } 1238 1239 if (params->has_cpu_throttle_initial) { 1240 dest->cpu_throttle_initial = params->cpu_throttle_initial; 1241 } 1242 1243 if (params->has_cpu_throttle_increment) { 1244 dest->cpu_throttle_increment = params->cpu_throttle_increment; 1245 } 1246 1247 if (params->has_tls_creds) { 1248 assert(params->tls_creds->type == QTYPE_QSTRING); 1249 dest->tls_creds = g_strdup(params->tls_creds->u.s); 1250 } 1251 1252 if (params->has_tls_hostname) { 1253 assert(params->tls_hostname->type == QTYPE_QSTRING); 1254 dest->tls_hostname = g_strdup(params->tls_hostname->u.s); 1255 } 1256 1257 if (params->has_max_bandwidth) { 1258 dest->max_bandwidth = params->max_bandwidth; 1259 } 1260 1261 if (params->has_downtime_limit) { 1262 dest->downtime_limit = params->downtime_limit; 1263 } 1264 1265 if (params->has_x_checkpoint_delay) { 1266 dest->x_checkpoint_delay = params->x_checkpoint_delay; 1267 } 1268 1269 if (params->has_block_incremental) { 1270 dest->block_incremental = params->block_incremental; 1271 } 1272 if (params->has_multifd_channels) { 1273 dest->multifd_channels = params->multifd_channels; 1274 } 1275 if (params->has_xbzrle_cache_size) { 1276 dest->xbzrle_cache_size = params->xbzrle_cache_size; 1277 } 1278 if (params->has_max_postcopy_bandwidth) { 1279 dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth; 1280 } 1281 if (params->has_max_cpu_throttle) { 1282 dest->max_cpu_throttle = params->max_cpu_throttle; 1283 } 1284 if (params->has_announce_initial) { 1285 dest->announce_initial = params->announce_initial; 1286 } 1287 if (params->has_announce_max) { 1288 dest->announce_max = params->announce_max; 1289 } 1290 if (params->has_announce_rounds) { 1291 dest->announce_rounds = params->announce_rounds; 1292 } 1293 if (params->has_announce_step) { 1294 dest->announce_step = params->announce_step; 1295 } 1296 } 1297 1298 static void migrate_params_apply(MigrateSetParameters *params, Error **errp) 1299 { 1300 MigrationState *s = migrate_get_current(); 1301 1302 /* TODO use QAPI_CLONE() instead of duplicating it inline */ 1303 1304 if (params->has_compress_level) { 1305 s->parameters.compress_level = params->compress_level; 1306 } 1307 1308 if (params->has_compress_threads) { 1309 s->parameters.compress_threads = params->compress_threads; 1310 } 1311 1312 if (params->has_compress_wait_thread) { 1313 s->parameters.compress_wait_thread = params->compress_wait_thread; 1314 } 1315 1316 if (params->has_decompress_threads) { 1317 s->parameters.decompress_threads = params->decompress_threads; 1318 } 1319 1320 if (params->has_cpu_throttle_initial) { 1321 s->parameters.cpu_throttle_initial = params->cpu_throttle_initial; 1322 } 1323 1324 if (params->has_cpu_throttle_increment) { 1325 s->parameters.cpu_throttle_increment = params->cpu_throttle_increment; 1326 } 1327 1328 if (params->has_tls_creds) { 1329 g_free(s->parameters.tls_creds); 1330 assert(params->tls_creds->type == QTYPE_QSTRING); 1331 s->parameters.tls_creds = g_strdup(params->tls_creds->u.s); 1332 } 1333 1334 if (params->has_tls_hostname) { 1335 g_free(s->parameters.tls_hostname); 1336 assert(params->tls_hostname->type == QTYPE_QSTRING); 1337 s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s); 1338 } 1339 1340 if (params->has_tls_authz) { 1341 g_free(s->parameters.tls_authz); 1342 assert(params->tls_authz->type == QTYPE_QSTRING); 1343 s->parameters.tls_authz = g_strdup(params->tls_authz->u.s); 1344 } 1345 1346 if (params->has_max_bandwidth) { 1347 s->parameters.max_bandwidth = params->max_bandwidth; 1348 if (s->to_dst_file && !migration_in_postcopy()) { 1349 qemu_file_set_rate_limit(s->to_dst_file, 1350 s->parameters.max_bandwidth / XFER_LIMIT_RATIO); 1351 } 1352 } 1353 1354 if (params->has_downtime_limit) { 1355 s->parameters.downtime_limit = params->downtime_limit; 1356 } 1357 1358 if (params->has_x_checkpoint_delay) { 1359 s->parameters.x_checkpoint_delay = params->x_checkpoint_delay; 1360 if (migration_in_colo_state()) { 1361 colo_checkpoint_notify(s); 1362 } 1363 } 1364 1365 if (params->has_block_incremental) { 1366 s->parameters.block_incremental = params->block_incremental; 1367 } 1368 if (params->has_multifd_channels) { 1369 s->parameters.multifd_channels = params->multifd_channels; 1370 } 1371 if (params->has_xbzrle_cache_size) { 1372 s->parameters.xbzrle_cache_size = params->xbzrle_cache_size; 1373 xbzrle_cache_resize(params->xbzrle_cache_size, errp); 1374 } 1375 if (params->has_max_postcopy_bandwidth) { 1376 s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth; 1377 if (s->to_dst_file && migration_in_postcopy()) { 1378 qemu_file_set_rate_limit(s->to_dst_file, 1379 s->parameters.max_postcopy_bandwidth / XFER_LIMIT_RATIO); 1380 } 1381 } 1382 if (params->has_max_cpu_throttle) { 1383 s->parameters.max_cpu_throttle = params->max_cpu_throttle; 1384 } 1385 if (params->has_announce_initial) { 1386 s->parameters.announce_initial = params->announce_initial; 1387 } 1388 if (params->has_announce_max) { 1389 s->parameters.announce_max = params->announce_max; 1390 } 1391 if (params->has_announce_rounds) { 1392 s->parameters.announce_rounds = params->announce_rounds; 1393 } 1394 if (params->has_announce_step) { 1395 s->parameters.announce_step = params->announce_step; 1396 } 1397 } 1398 1399 void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp) 1400 { 1401 MigrationParameters tmp; 1402 1403 /* TODO Rewrite "" to null instead */ 1404 if (params->has_tls_creds 1405 && params->tls_creds->type == QTYPE_QNULL) { 1406 qobject_unref(params->tls_creds->u.n); 1407 params->tls_creds->type = QTYPE_QSTRING; 1408 params->tls_creds->u.s = strdup(""); 1409 } 1410 /* TODO Rewrite "" to null instead */ 1411 if (params->has_tls_hostname 1412 && params->tls_hostname->type == QTYPE_QNULL) { 1413 qobject_unref(params->tls_hostname->u.n); 1414 params->tls_hostname->type = QTYPE_QSTRING; 1415 params->tls_hostname->u.s = strdup(""); 1416 } 1417 1418 migrate_params_test_apply(params, &tmp); 1419 1420 if (!migrate_params_check(&tmp, errp)) { 1421 /* Invalid parameter */ 1422 return; 1423 } 1424 1425 migrate_params_apply(params, errp); 1426 } 1427 1428 1429 void qmp_migrate_start_postcopy(Error **errp) 1430 { 1431 MigrationState *s = migrate_get_current(); 1432 1433 if (!migrate_postcopy()) { 1434 error_setg(errp, "Enable postcopy with migrate_set_capability before" 1435 " the start of migration"); 1436 return; 1437 } 1438 1439 if (s->state == MIGRATION_STATUS_NONE) { 1440 error_setg(errp, "Postcopy must be started after migration has been" 1441 " started"); 1442 return; 1443 } 1444 /* 1445 * we don't error if migration has finished since that would be racy 1446 * with issuing this command. 1447 */ 1448 atomic_set(&s->start_postcopy, true); 1449 } 1450 1451 /* shared migration helpers */ 1452 1453 void migrate_set_state(int *state, int old_state, int new_state) 1454 { 1455 assert(new_state < MIGRATION_STATUS__MAX); 1456 if (atomic_cmpxchg(state, old_state, new_state) == old_state) { 1457 trace_migrate_set_state(MigrationStatus_str(new_state)); 1458 migrate_generate_event(new_state); 1459 } 1460 } 1461 1462 static MigrationCapabilityStatusList *migrate_cap_add( 1463 MigrationCapabilityStatusList *list, 1464 MigrationCapability index, 1465 bool state) 1466 { 1467 MigrationCapabilityStatusList *cap; 1468 1469 cap = g_new0(MigrationCapabilityStatusList, 1); 1470 cap->value = g_new0(MigrationCapabilityStatus, 1); 1471 cap->value->capability = index; 1472 cap->value->state = state; 1473 cap->next = list; 1474 1475 return cap; 1476 } 1477 1478 void migrate_set_block_enabled(bool value, Error **errp) 1479 { 1480 MigrationCapabilityStatusList *cap; 1481 1482 cap = migrate_cap_add(NULL, MIGRATION_CAPABILITY_BLOCK, value); 1483 qmp_migrate_set_capabilities(cap, errp); 1484 qapi_free_MigrationCapabilityStatusList(cap); 1485 } 1486 1487 static void migrate_set_block_incremental(MigrationState *s, bool value) 1488 { 1489 s->parameters.block_incremental = value; 1490 } 1491 1492 static void block_cleanup_parameters(MigrationState *s) 1493 { 1494 if (s->must_remove_block_options) { 1495 /* setting to false can never fail */ 1496 migrate_set_block_enabled(false, &error_abort); 1497 migrate_set_block_incremental(s, false); 1498 s->must_remove_block_options = false; 1499 } 1500 } 1501 1502 static void migrate_fd_cleanup(MigrationState *s) 1503 { 1504 qemu_bh_delete(s->cleanup_bh); 1505 s->cleanup_bh = NULL; 1506 1507 qemu_savevm_state_cleanup(); 1508 1509 if (s->to_dst_file) { 1510 QEMUFile *tmp; 1511 1512 trace_migrate_fd_cleanup(); 1513 qemu_mutex_unlock_iothread(); 1514 if (s->migration_thread_running) { 1515 qemu_thread_join(&s->thread); 1516 s->migration_thread_running = false; 1517 } 1518 qemu_mutex_lock_iothread(); 1519 1520 multifd_save_cleanup(); 1521 qemu_mutex_lock(&s->qemu_file_lock); 1522 tmp = s->to_dst_file; 1523 s->to_dst_file = NULL; 1524 qemu_mutex_unlock(&s->qemu_file_lock); 1525 /* 1526 * Close the file handle without the lock to make sure the 1527 * critical section won't block for long. 1528 */ 1529 qemu_fclose(tmp); 1530 } 1531 1532 assert((s->state != MIGRATION_STATUS_ACTIVE) && 1533 (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE)); 1534 1535 if (s->state == MIGRATION_STATUS_CANCELLING) { 1536 migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING, 1537 MIGRATION_STATUS_CANCELLED); 1538 } 1539 1540 if (s->error) { 1541 /* It is used on info migrate. We can't free it */ 1542 error_report_err(error_copy(s->error)); 1543 } 1544 notifier_list_notify(&migration_state_notifiers, s); 1545 block_cleanup_parameters(s); 1546 } 1547 1548 static void migrate_fd_cleanup_schedule(MigrationState *s) 1549 { 1550 /* 1551 * Ref the state for bh, because it may be called when 1552 * there're already no other refs 1553 */ 1554 object_ref(OBJECT(s)); 1555 qemu_bh_schedule(s->cleanup_bh); 1556 } 1557 1558 static void migrate_fd_cleanup_bh(void *opaque) 1559 { 1560 MigrationState *s = opaque; 1561 migrate_fd_cleanup(s); 1562 object_unref(OBJECT(s)); 1563 } 1564 1565 void migrate_set_error(MigrationState *s, const Error *error) 1566 { 1567 qemu_mutex_lock(&s->error_mutex); 1568 if (!s->error) { 1569 s->error = error_copy(error); 1570 } 1571 qemu_mutex_unlock(&s->error_mutex); 1572 } 1573 1574 void migrate_fd_error(MigrationState *s, const Error *error) 1575 { 1576 trace_migrate_fd_error(error_get_pretty(error)); 1577 assert(s->to_dst_file == NULL); 1578 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 1579 MIGRATION_STATUS_FAILED); 1580 migrate_set_error(s, error); 1581 } 1582 1583 static void migrate_fd_cancel(MigrationState *s) 1584 { 1585 int old_state ; 1586 QEMUFile *f = migrate_get_current()->to_dst_file; 1587 trace_migrate_fd_cancel(); 1588 1589 if (s->rp_state.from_dst_file) { 1590 /* shutdown the rp socket, so causing the rp thread to shutdown */ 1591 qemu_file_shutdown(s->rp_state.from_dst_file); 1592 } 1593 1594 do { 1595 old_state = s->state; 1596 if (!migration_is_setup_or_active(old_state)) { 1597 break; 1598 } 1599 /* If the migration is paused, kick it out of the pause */ 1600 if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) { 1601 qemu_sem_post(&s->pause_sem); 1602 } 1603 migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING); 1604 } while (s->state != MIGRATION_STATUS_CANCELLING); 1605 1606 /* 1607 * If we're unlucky the migration code might be stuck somewhere in a 1608 * send/write while the network has failed and is waiting to timeout; 1609 * if we've got shutdown(2) available then we can force it to quit. 1610 * The outgoing qemu file gets closed in migrate_fd_cleanup that is 1611 * called in a bh, so there is no race against this cancel. 1612 */ 1613 if (s->state == MIGRATION_STATUS_CANCELLING && f) { 1614 qemu_file_shutdown(f); 1615 } 1616 if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) { 1617 Error *local_err = NULL; 1618 1619 bdrv_invalidate_cache_all(&local_err); 1620 if (local_err) { 1621 error_report_err(local_err); 1622 } else { 1623 s->block_inactive = false; 1624 } 1625 } 1626 } 1627 1628 void add_migration_state_change_notifier(Notifier *notify) 1629 { 1630 notifier_list_add(&migration_state_notifiers, notify); 1631 } 1632 1633 void remove_migration_state_change_notifier(Notifier *notify) 1634 { 1635 notifier_remove(notify); 1636 } 1637 1638 bool migration_in_setup(MigrationState *s) 1639 { 1640 return s->state == MIGRATION_STATUS_SETUP; 1641 } 1642 1643 bool migration_has_finished(MigrationState *s) 1644 { 1645 return s->state == MIGRATION_STATUS_COMPLETED; 1646 } 1647 1648 bool migration_has_failed(MigrationState *s) 1649 { 1650 return (s->state == MIGRATION_STATUS_CANCELLED || 1651 s->state == MIGRATION_STATUS_FAILED); 1652 } 1653 1654 bool migration_in_postcopy(void) 1655 { 1656 MigrationState *s = migrate_get_current(); 1657 1658 return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); 1659 } 1660 1661 bool migration_in_postcopy_after_devices(MigrationState *s) 1662 { 1663 return migration_in_postcopy() && s->postcopy_after_devices; 1664 } 1665 1666 bool migration_is_idle(void) 1667 { 1668 MigrationState *s = current_migration; 1669 1670 if (!s) { 1671 return true; 1672 } 1673 1674 switch (s->state) { 1675 case MIGRATION_STATUS_NONE: 1676 case MIGRATION_STATUS_CANCELLED: 1677 case MIGRATION_STATUS_COMPLETED: 1678 case MIGRATION_STATUS_FAILED: 1679 return true; 1680 case MIGRATION_STATUS_SETUP: 1681 case MIGRATION_STATUS_CANCELLING: 1682 case MIGRATION_STATUS_ACTIVE: 1683 case MIGRATION_STATUS_POSTCOPY_ACTIVE: 1684 case MIGRATION_STATUS_COLO: 1685 case MIGRATION_STATUS_PRE_SWITCHOVER: 1686 case MIGRATION_STATUS_DEVICE: 1687 return false; 1688 case MIGRATION_STATUS__MAX: 1689 g_assert_not_reached(); 1690 } 1691 1692 return false; 1693 } 1694 1695 void migrate_init(MigrationState *s) 1696 { 1697 /* 1698 * Reinitialise all migration state, except 1699 * parameters/capabilities that the user set, and 1700 * locks. 1701 */ 1702 s->bytes_xfer = 0; 1703 s->cleanup_bh = 0; 1704 s->to_dst_file = NULL; 1705 s->state = MIGRATION_STATUS_NONE; 1706 s->rp_state.from_dst_file = NULL; 1707 s->rp_state.error = false; 1708 s->mbps = 0.0; 1709 s->pages_per_second = 0.0; 1710 s->downtime = 0; 1711 s->expected_downtime = 0; 1712 s->setup_time = 0; 1713 s->start_postcopy = false; 1714 s->postcopy_after_devices = false; 1715 s->migration_thread_running = false; 1716 error_free(s->error); 1717 s->error = NULL; 1718 1719 migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); 1720 1721 s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 1722 s->total_time = 0; 1723 s->vm_was_running = false; 1724 s->iteration_initial_bytes = 0; 1725 s->threshold_size = 0; 1726 } 1727 1728 static GSList *migration_blockers; 1729 1730 int migrate_add_blocker(Error *reason, Error **errp) 1731 { 1732 if (only_migratable) { 1733 error_propagate_prepend(errp, error_copy(reason), 1734 "disallowing migration blocker " 1735 "(--only-migratable) for: "); 1736 return -EACCES; 1737 } 1738 1739 if (migration_is_idle()) { 1740 migration_blockers = g_slist_prepend(migration_blockers, reason); 1741 return 0; 1742 } 1743 1744 error_propagate_prepend(errp, error_copy(reason), 1745 "disallowing migration blocker " 1746 "(migration in progress) for: "); 1747 return -EBUSY; 1748 } 1749 1750 void migrate_del_blocker(Error *reason) 1751 { 1752 migration_blockers = g_slist_remove(migration_blockers, reason); 1753 } 1754 1755 void qmp_migrate_incoming(const char *uri, Error **errp) 1756 { 1757 Error *local_err = NULL; 1758 static bool once = true; 1759 1760 if (!deferred_incoming) { 1761 error_setg(errp, "For use with '-incoming defer'"); 1762 return; 1763 } 1764 if (!once) { 1765 error_setg(errp, "The incoming migration has already been started"); 1766 } 1767 1768 qemu_start_incoming_migration(uri, &local_err); 1769 1770 if (local_err) { 1771 error_propagate(errp, local_err); 1772 return; 1773 } 1774 1775 once = false; 1776 } 1777 1778 void qmp_migrate_recover(const char *uri, Error **errp) 1779 { 1780 MigrationIncomingState *mis = migration_incoming_get_current(); 1781 1782 if (mis->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { 1783 error_setg(errp, "Migrate recover can only be run " 1784 "when postcopy is paused."); 1785 return; 1786 } 1787 1788 if (atomic_cmpxchg(&mis->postcopy_recover_triggered, 1789 false, true) == true) { 1790 error_setg(errp, "Migrate recovery is triggered already"); 1791 return; 1792 } 1793 1794 /* 1795 * Note that this call will never start a real migration; it will 1796 * only re-setup the migration stream and poke existing migration 1797 * to continue using that newly established channel. 1798 */ 1799 qemu_start_incoming_migration(uri, errp); 1800 } 1801 1802 void qmp_migrate_pause(Error **errp) 1803 { 1804 MigrationState *ms = migrate_get_current(); 1805 MigrationIncomingState *mis = migration_incoming_get_current(); 1806 int ret; 1807 1808 if (ms->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { 1809 /* Source side, during postcopy */ 1810 qemu_mutex_lock(&ms->qemu_file_lock); 1811 ret = qemu_file_shutdown(ms->to_dst_file); 1812 qemu_mutex_unlock(&ms->qemu_file_lock); 1813 if (ret) { 1814 error_setg(errp, "Failed to pause source migration"); 1815 } 1816 return; 1817 } 1818 1819 if (mis->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { 1820 ret = qemu_file_shutdown(mis->from_src_file); 1821 if (ret) { 1822 error_setg(errp, "Failed to pause destination migration"); 1823 } 1824 return; 1825 } 1826 1827 error_setg(errp, "migrate-pause is currently only supported " 1828 "during postcopy-active state"); 1829 } 1830 1831 bool migration_is_blocked(Error **errp) 1832 { 1833 if (qemu_savevm_state_blocked(errp)) { 1834 return true; 1835 } 1836 1837 if (migration_blockers) { 1838 error_propagate(errp, error_copy(migration_blockers->data)); 1839 return true; 1840 } 1841 1842 return false; 1843 } 1844 1845 /* Returns true if continue to migrate, or false if error detected */ 1846 static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc, 1847 bool resume, Error **errp) 1848 { 1849 Error *local_err = NULL; 1850 1851 if (resume) { 1852 if (s->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { 1853 error_setg(errp, "Cannot resume if there is no " 1854 "paused migration"); 1855 return false; 1856 } 1857 1858 /* 1859 * Postcopy recovery won't work well with release-ram 1860 * capability since release-ram will drop the page buffer as 1861 * long as the page is put into the send buffer. So if there 1862 * is a network failure happened, any page buffers that have 1863 * not yet reached the destination VM but have already been 1864 * sent from the source VM will be lost forever. Let's refuse 1865 * the client from resuming such a postcopy migration. 1866 * Luckily release-ram was designed to only be used when src 1867 * and destination VMs are on the same host, so it should be 1868 * fine. 1869 */ 1870 if (migrate_release_ram()) { 1871 error_setg(errp, "Postcopy recovery cannot work " 1872 "when release-ram capability is set"); 1873 return false; 1874 } 1875 1876 /* This is a resume, skip init status */ 1877 return true; 1878 } 1879 1880 if (migration_is_setup_or_active(s->state) || 1881 s->state == MIGRATION_STATUS_CANCELLING || 1882 s->state == MIGRATION_STATUS_COLO) { 1883 error_setg(errp, QERR_MIGRATION_ACTIVE); 1884 return false; 1885 } 1886 1887 if (runstate_check(RUN_STATE_INMIGRATE)) { 1888 error_setg(errp, "Guest is waiting for an incoming migration"); 1889 return false; 1890 } 1891 1892 if (migration_is_blocked(errp)) { 1893 return false; 1894 } 1895 1896 if (blk || blk_inc) { 1897 if (migrate_use_block() || migrate_use_block_incremental()) { 1898 error_setg(errp, "Command options are incompatible with " 1899 "current migration capabilities"); 1900 return false; 1901 } 1902 migrate_set_block_enabled(true, &local_err); 1903 if (local_err) { 1904 error_propagate(errp, local_err); 1905 return false; 1906 } 1907 s->must_remove_block_options = true; 1908 } 1909 1910 if (blk_inc) { 1911 migrate_set_block_incremental(s, true); 1912 } 1913 1914 migrate_init(s); 1915 1916 return true; 1917 } 1918 1919 void qmp_migrate(const char *uri, bool has_blk, bool blk, 1920 bool has_inc, bool inc, bool has_detach, bool detach, 1921 bool has_resume, bool resume, Error **errp) 1922 { 1923 Error *local_err = NULL; 1924 MigrationState *s = migrate_get_current(); 1925 const char *p; 1926 1927 if (!migrate_prepare(s, has_blk && blk, has_inc && inc, 1928 has_resume && resume, errp)) { 1929 /* Error detected, put into errp */ 1930 return; 1931 } 1932 1933 if (strstart(uri, "tcp:", &p)) { 1934 tcp_start_outgoing_migration(s, p, &local_err); 1935 #ifdef CONFIG_RDMA 1936 } else if (strstart(uri, "rdma:", &p)) { 1937 rdma_start_outgoing_migration(s, p, &local_err); 1938 #endif 1939 } else if (strstart(uri, "exec:", &p)) { 1940 exec_start_outgoing_migration(s, p, &local_err); 1941 } else if (strstart(uri, "unix:", &p)) { 1942 unix_start_outgoing_migration(s, p, &local_err); 1943 } else if (strstart(uri, "fd:", &p)) { 1944 fd_start_outgoing_migration(s, p, &local_err); 1945 } else { 1946 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri", 1947 "a valid migration protocol"); 1948 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 1949 MIGRATION_STATUS_FAILED); 1950 block_cleanup_parameters(s); 1951 return; 1952 } 1953 1954 if (local_err) { 1955 migrate_fd_error(s, local_err); 1956 error_propagate(errp, local_err); 1957 return; 1958 } 1959 } 1960 1961 void qmp_migrate_cancel(Error **errp) 1962 { 1963 migrate_fd_cancel(migrate_get_current()); 1964 } 1965 1966 void qmp_migrate_continue(MigrationStatus state, Error **errp) 1967 { 1968 MigrationState *s = migrate_get_current(); 1969 if (s->state != state) { 1970 error_setg(errp, "Migration not in expected state: %s", 1971 MigrationStatus_str(s->state)); 1972 return; 1973 } 1974 qemu_sem_post(&s->pause_sem); 1975 } 1976 1977 void qmp_migrate_set_cache_size(int64_t value, Error **errp) 1978 { 1979 MigrateSetParameters p = { 1980 .has_xbzrle_cache_size = true, 1981 .xbzrle_cache_size = value, 1982 }; 1983 1984 qmp_migrate_set_parameters(&p, errp); 1985 } 1986 1987 int64_t qmp_query_migrate_cache_size(Error **errp) 1988 { 1989 return migrate_xbzrle_cache_size(); 1990 } 1991 1992 void qmp_migrate_set_speed(int64_t value, Error **errp) 1993 { 1994 MigrateSetParameters p = { 1995 .has_max_bandwidth = true, 1996 .max_bandwidth = value, 1997 }; 1998 1999 qmp_migrate_set_parameters(&p, errp); 2000 } 2001 2002 void qmp_migrate_set_downtime(double value, Error **errp) 2003 { 2004 if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) { 2005 error_setg(errp, "Parameter 'downtime_limit' expects an integer in " 2006 "the range of 0 to %d seconds", 2007 MAX_MIGRATE_DOWNTIME_SECONDS); 2008 return; 2009 } 2010 2011 value *= 1000; /* Convert to milliseconds */ 2012 value = MAX(0, MIN(INT64_MAX, value)); 2013 2014 MigrateSetParameters p = { 2015 .has_downtime_limit = true, 2016 .downtime_limit = value, 2017 }; 2018 2019 qmp_migrate_set_parameters(&p, errp); 2020 } 2021 2022 bool migrate_release_ram(void) 2023 { 2024 MigrationState *s; 2025 2026 s = migrate_get_current(); 2027 2028 return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM]; 2029 } 2030 2031 bool migrate_postcopy_ram(void) 2032 { 2033 MigrationState *s; 2034 2035 s = migrate_get_current(); 2036 2037 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM]; 2038 } 2039 2040 bool migrate_postcopy(void) 2041 { 2042 return migrate_postcopy_ram() || migrate_dirty_bitmaps(); 2043 } 2044 2045 bool migrate_auto_converge(void) 2046 { 2047 MigrationState *s; 2048 2049 s = migrate_get_current(); 2050 2051 return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; 2052 } 2053 2054 bool migrate_zero_blocks(void) 2055 { 2056 MigrationState *s; 2057 2058 s = migrate_get_current(); 2059 2060 return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; 2061 } 2062 2063 bool migrate_postcopy_blocktime(void) 2064 { 2065 MigrationState *s; 2066 2067 s = migrate_get_current(); 2068 2069 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME]; 2070 } 2071 2072 bool migrate_use_compression(void) 2073 { 2074 MigrationState *s; 2075 2076 s = migrate_get_current(); 2077 2078 return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS]; 2079 } 2080 2081 int migrate_compress_level(void) 2082 { 2083 MigrationState *s; 2084 2085 s = migrate_get_current(); 2086 2087 return s->parameters.compress_level; 2088 } 2089 2090 int migrate_compress_threads(void) 2091 { 2092 MigrationState *s; 2093 2094 s = migrate_get_current(); 2095 2096 return s->parameters.compress_threads; 2097 } 2098 2099 int migrate_compress_wait_thread(void) 2100 { 2101 MigrationState *s; 2102 2103 s = migrate_get_current(); 2104 2105 return s->parameters.compress_wait_thread; 2106 } 2107 2108 int migrate_decompress_threads(void) 2109 { 2110 MigrationState *s; 2111 2112 s = migrate_get_current(); 2113 2114 return s->parameters.decompress_threads; 2115 } 2116 2117 bool migrate_dirty_bitmaps(void) 2118 { 2119 MigrationState *s; 2120 2121 s = migrate_get_current(); 2122 2123 return s->enabled_capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS]; 2124 } 2125 2126 bool migrate_ignore_shared(void) 2127 { 2128 MigrationState *s; 2129 2130 s = migrate_get_current(); 2131 2132 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_IGNORE_SHARED]; 2133 } 2134 2135 bool migrate_use_events(void) 2136 { 2137 MigrationState *s; 2138 2139 s = migrate_get_current(); 2140 2141 return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS]; 2142 } 2143 2144 bool migrate_use_multifd(void) 2145 { 2146 MigrationState *s; 2147 2148 s = migrate_get_current(); 2149 2150 return s->enabled_capabilities[MIGRATION_CAPABILITY_MULTIFD]; 2151 } 2152 2153 bool migrate_pause_before_switchover(void) 2154 { 2155 MigrationState *s; 2156 2157 s = migrate_get_current(); 2158 2159 return s->enabled_capabilities[ 2160 MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER]; 2161 } 2162 2163 int migrate_multifd_channels(void) 2164 { 2165 MigrationState *s; 2166 2167 s = migrate_get_current(); 2168 2169 return s->parameters.multifd_channels; 2170 } 2171 2172 int migrate_use_xbzrle(void) 2173 { 2174 MigrationState *s; 2175 2176 s = migrate_get_current(); 2177 2178 return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; 2179 } 2180 2181 int64_t migrate_xbzrle_cache_size(void) 2182 { 2183 MigrationState *s; 2184 2185 s = migrate_get_current(); 2186 2187 return s->parameters.xbzrle_cache_size; 2188 } 2189 2190 static int64_t migrate_max_postcopy_bandwidth(void) 2191 { 2192 MigrationState *s; 2193 2194 s = migrate_get_current(); 2195 2196 return s->parameters.max_postcopy_bandwidth; 2197 } 2198 2199 bool migrate_use_block(void) 2200 { 2201 MigrationState *s; 2202 2203 s = migrate_get_current(); 2204 2205 return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK]; 2206 } 2207 2208 bool migrate_use_return_path(void) 2209 { 2210 MigrationState *s; 2211 2212 s = migrate_get_current(); 2213 2214 return s->enabled_capabilities[MIGRATION_CAPABILITY_RETURN_PATH]; 2215 } 2216 2217 bool migrate_use_block_incremental(void) 2218 { 2219 MigrationState *s; 2220 2221 s = migrate_get_current(); 2222 2223 return s->parameters.block_incremental; 2224 } 2225 2226 /* migration thread support */ 2227 /* 2228 * Something bad happened to the RP stream, mark an error 2229 * The caller shall print or trace something to indicate why 2230 */ 2231 static void mark_source_rp_bad(MigrationState *s) 2232 { 2233 s->rp_state.error = true; 2234 } 2235 2236 static struct rp_cmd_args { 2237 ssize_t len; /* -1 = variable */ 2238 const char *name; 2239 } rp_cmd_args[] = { 2240 [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, 2241 [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, 2242 [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, 2243 [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" }, 2244 [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" }, 2245 [MIG_RP_MSG_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" }, 2246 [MIG_RP_MSG_RESUME_ACK] = { .len = 4, .name = "RESUME_ACK" }, 2247 [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, 2248 }; 2249 2250 /* 2251 * Process a request for pages received on the return path, 2252 * We're allowed to send more than requested (e.g. to round to our page size) 2253 * and we don't need to send pages that have already been sent. 2254 */ 2255 static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname, 2256 ram_addr_t start, size_t len) 2257 { 2258 long our_host_ps = getpagesize(); 2259 2260 trace_migrate_handle_rp_req_pages(rbname, start, len); 2261 2262 /* 2263 * Since we currently insist on matching page sizes, just sanity check 2264 * we're being asked for whole host pages. 2265 */ 2266 if (start & (our_host_ps-1) || 2267 (len & (our_host_ps-1))) { 2268 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT 2269 " len: %zd", __func__, start, len); 2270 mark_source_rp_bad(ms); 2271 return; 2272 } 2273 2274 if (ram_save_queue_pages(rbname, start, len)) { 2275 mark_source_rp_bad(ms); 2276 } 2277 } 2278 2279 /* Return true to retry, false to quit */ 2280 static bool postcopy_pause_return_path_thread(MigrationState *s) 2281 { 2282 trace_postcopy_pause_return_path(); 2283 2284 qemu_sem_wait(&s->postcopy_pause_rp_sem); 2285 2286 trace_postcopy_pause_return_path_continued(); 2287 2288 return true; 2289 } 2290 2291 static int migrate_handle_rp_recv_bitmap(MigrationState *s, char *block_name) 2292 { 2293 RAMBlock *block = qemu_ram_block_by_name(block_name); 2294 2295 if (!block) { 2296 error_report("%s: invalid block name '%s'", __func__, block_name); 2297 return -EINVAL; 2298 } 2299 2300 /* Fetch the received bitmap and refresh the dirty bitmap */ 2301 return ram_dirty_bitmap_reload(s, block); 2302 } 2303 2304 static int migrate_handle_rp_resume_ack(MigrationState *s, uint32_t value) 2305 { 2306 trace_source_return_path_thread_resume_ack(value); 2307 2308 if (value != MIGRATION_RESUME_ACK_VALUE) { 2309 error_report("%s: illegal resume_ack value %"PRIu32, 2310 __func__, value); 2311 return -1; 2312 } 2313 2314 /* Now both sides are active. */ 2315 migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_RECOVER, 2316 MIGRATION_STATUS_POSTCOPY_ACTIVE); 2317 2318 /* Notify send thread that time to continue send pages */ 2319 qemu_sem_post(&s->rp_state.rp_sem); 2320 2321 return 0; 2322 } 2323 2324 /* 2325 * Handles messages sent on the return path towards the source VM 2326 * 2327 */ 2328 static void *source_return_path_thread(void *opaque) 2329 { 2330 MigrationState *ms = opaque; 2331 QEMUFile *rp = ms->rp_state.from_dst_file; 2332 uint16_t header_len, header_type; 2333 uint8_t buf[512]; 2334 uint32_t tmp32, sibling_error; 2335 ram_addr_t start = 0; /* =0 to silence warning */ 2336 size_t len = 0, expected_len; 2337 int res; 2338 2339 trace_source_return_path_thread_entry(); 2340 rcu_register_thread(); 2341 2342 retry: 2343 while (!ms->rp_state.error && !qemu_file_get_error(rp) && 2344 migration_is_setup_or_active(ms->state)) { 2345 trace_source_return_path_thread_loop_top(); 2346 header_type = qemu_get_be16(rp); 2347 header_len = qemu_get_be16(rp); 2348 2349 if (qemu_file_get_error(rp)) { 2350 mark_source_rp_bad(ms); 2351 goto out; 2352 } 2353 2354 if (header_type >= MIG_RP_MSG_MAX || 2355 header_type == MIG_RP_MSG_INVALID) { 2356 error_report("RP: Received invalid message 0x%04x length 0x%04x", 2357 header_type, header_len); 2358 mark_source_rp_bad(ms); 2359 goto out; 2360 } 2361 2362 if ((rp_cmd_args[header_type].len != -1 && 2363 header_len != rp_cmd_args[header_type].len) || 2364 header_len > sizeof(buf)) { 2365 error_report("RP: Received '%s' message (0x%04x) with" 2366 "incorrect length %d expecting %zu", 2367 rp_cmd_args[header_type].name, header_type, header_len, 2368 (size_t)rp_cmd_args[header_type].len); 2369 mark_source_rp_bad(ms); 2370 goto out; 2371 } 2372 2373 /* We know we've got a valid header by this point */ 2374 res = qemu_get_buffer(rp, buf, header_len); 2375 if (res != header_len) { 2376 error_report("RP: Failed reading data for message 0x%04x" 2377 " read %d expected %d", 2378 header_type, res, header_len); 2379 mark_source_rp_bad(ms); 2380 goto out; 2381 } 2382 2383 /* OK, we have the message and the data */ 2384 switch (header_type) { 2385 case MIG_RP_MSG_SHUT: 2386 sibling_error = ldl_be_p(buf); 2387 trace_source_return_path_thread_shut(sibling_error); 2388 if (sibling_error) { 2389 error_report("RP: Sibling indicated error %d", sibling_error); 2390 mark_source_rp_bad(ms); 2391 } 2392 /* 2393 * We'll let the main thread deal with closing the RP 2394 * we could do a shutdown(2) on it, but we're the only user 2395 * anyway, so there's nothing gained. 2396 */ 2397 goto out; 2398 2399 case MIG_RP_MSG_PONG: 2400 tmp32 = ldl_be_p(buf); 2401 trace_source_return_path_thread_pong(tmp32); 2402 break; 2403 2404 case MIG_RP_MSG_REQ_PAGES: 2405 start = ldq_be_p(buf); 2406 len = ldl_be_p(buf + 8); 2407 migrate_handle_rp_req_pages(ms, NULL, start, len); 2408 break; 2409 2410 case MIG_RP_MSG_REQ_PAGES_ID: 2411 expected_len = 12 + 1; /* header + termination */ 2412 2413 if (header_len >= expected_len) { 2414 start = ldq_be_p(buf); 2415 len = ldl_be_p(buf + 8); 2416 /* Now we expect an idstr */ 2417 tmp32 = buf[12]; /* Length of the following idstr */ 2418 buf[13 + tmp32] = '\0'; 2419 expected_len += tmp32; 2420 } 2421 if (header_len != expected_len) { 2422 error_report("RP: Req_Page_id with length %d expecting %zd", 2423 header_len, expected_len); 2424 mark_source_rp_bad(ms); 2425 goto out; 2426 } 2427 migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len); 2428 break; 2429 2430 case MIG_RP_MSG_RECV_BITMAP: 2431 if (header_len < 1) { 2432 error_report("%s: missing block name", __func__); 2433 mark_source_rp_bad(ms); 2434 goto out; 2435 } 2436 /* Format: len (1B) + idstr (<255B). This ends the idstr. */ 2437 buf[buf[0] + 1] = '\0'; 2438 if (migrate_handle_rp_recv_bitmap(ms, (char *)(buf + 1))) { 2439 mark_source_rp_bad(ms); 2440 goto out; 2441 } 2442 break; 2443 2444 case MIG_RP_MSG_RESUME_ACK: 2445 tmp32 = ldl_be_p(buf); 2446 if (migrate_handle_rp_resume_ack(ms, tmp32)) { 2447 mark_source_rp_bad(ms); 2448 goto out; 2449 } 2450 break; 2451 2452 default: 2453 break; 2454 } 2455 } 2456 2457 out: 2458 res = qemu_file_get_error(rp); 2459 if (res) { 2460 if (res == -EIO) { 2461 /* 2462 * Maybe there is something we can do: it looks like a 2463 * network down issue, and we pause for a recovery. 2464 */ 2465 if (postcopy_pause_return_path_thread(ms)) { 2466 /* Reload rp, reset the rest */ 2467 if (rp != ms->rp_state.from_dst_file) { 2468 qemu_fclose(rp); 2469 rp = ms->rp_state.from_dst_file; 2470 } 2471 ms->rp_state.error = false; 2472 goto retry; 2473 } 2474 } 2475 2476 trace_source_return_path_thread_bad_end(); 2477 mark_source_rp_bad(ms); 2478 } 2479 2480 trace_source_return_path_thread_end(); 2481 ms->rp_state.from_dst_file = NULL; 2482 qemu_fclose(rp); 2483 rcu_unregister_thread(); 2484 return NULL; 2485 } 2486 2487 static int open_return_path_on_source(MigrationState *ms, 2488 bool create_thread) 2489 { 2490 2491 ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file); 2492 if (!ms->rp_state.from_dst_file) { 2493 return -1; 2494 } 2495 2496 trace_open_return_path_on_source(); 2497 2498 if (!create_thread) { 2499 /* We're done */ 2500 return 0; 2501 } 2502 2503 qemu_thread_create(&ms->rp_state.rp_thread, "return path", 2504 source_return_path_thread, ms, QEMU_THREAD_JOINABLE); 2505 2506 trace_open_return_path_on_source_continue(); 2507 2508 return 0; 2509 } 2510 2511 /* Returns 0 if the RP was ok, otherwise there was an error on the RP */ 2512 static int await_return_path_close_on_source(MigrationState *ms) 2513 { 2514 /* 2515 * If this is a normal exit then the destination will send a SHUT and the 2516 * rp_thread will exit, however if there's an error we need to cause 2517 * it to exit. 2518 */ 2519 if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) { 2520 /* 2521 * shutdown(2), if we have it, will cause it to unblock if it's stuck 2522 * waiting for the destination. 2523 */ 2524 qemu_file_shutdown(ms->rp_state.from_dst_file); 2525 mark_source_rp_bad(ms); 2526 } 2527 trace_await_return_path_close_on_source_joining(); 2528 qemu_thread_join(&ms->rp_state.rp_thread); 2529 trace_await_return_path_close_on_source_close(); 2530 return ms->rp_state.error; 2531 } 2532 2533 /* 2534 * Switch from normal iteration to postcopy 2535 * Returns non-0 on error 2536 */ 2537 static int postcopy_start(MigrationState *ms) 2538 { 2539 int ret; 2540 QIOChannelBuffer *bioc; 2541 QEMUFile *fb; 2542 int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 2543 int64_t bandwidth = migrate_max_postcopy_bandwidth(); 2544 bool restart_block = false; 2545 int cur_state = MIGRATION_STATUS_ACTIVE; 2546 if (!migrate_pause_before_switchover()) { 2547 migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, 2548 MIGRATION_STATUS_POSTCOPY_ACTIVE); 2549 } 2550 2551 trace_postcopy_start(); 2552 qemu_mutex_lock_iothread(); 2553 trace_postcopy_start_set_run(); 2554 2555 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); 2556 global_state_store(); 2557 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); 2558 if (ret < 0) { 2559 goto fail; 2560 } 2561 2562 ret = migration_maybe_pause(ms, &cur_state, 2563 MIGRATION_STATUS_POSTCOPY_ACTIVE); 2564 if (ret < 0) { 2565 goto fail; 2566 } 2567 2568 ret = bdrv_inactivate_all(); 2569 if (ret < 0) { 2570 goto fail; 2571 } 2572 restart_block = true; 2573 2574 /* 2575 * Cause any non-postcopiable, but iterative devices to 2576 * send out their final data. 2577 */ 2578 qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false); 2579 2580 /* 2581 * in Finish migrate and with the io-lock held everything should 2582 * be quiet, but we've potentially still got dirty pages and we 2583 * need to tell the destination to throw any pages it's already received 2584 * that are dirty 2585 */ 2586 if (migrate_postcopy_ram()) { 2587 if (ram_postcopy_send_discard_bitmap(ms)) { 2588 error_report("postcopy send discard bitmap failed"); 2589 goto fail; 2590 } 2591 } 2592 2593 /* 2594 * send rest of state - note things that are doing postcopy 2595 * will notice we're in POSTCOPY_ACTIVE and not actually 2596 * wrap their state up here 2597 */ 2598 /* 0 max-postcopy-bandwidth means unlimited */ 2599 if (!bandwidth) { 2600 qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX); 2601 } else { 2602 qemu_file_set_rate_limit(ms->to_dst_file, bandwidth / XFER_LIMIT_RATIO); 2603 } 2604 if (migrate_postcopy_ram()) { 2605 /* Ping just for debugging, helps line traces up */ 2606 qemu_savevm_send_ping(ms->to_dst_file, 2); 2607 } 2608 2609 /* 2610 * While loading the device state we may trigger page transfer 2611 * requests and the fd must be free to process those, and thus 2612 * the destination must read the whole device state off the fd before 2613 * it starts processing it. Unfortunately the ad-hoc migration format 2614 * doesn't allow the destination to know the size to read without fully 2615 * parsing it through each devices load-state code (especially the open 2616 * coded devices that use get/put). 2617 * So we wrap the device state up in a package with a length at the start; 2618 * to do this we use a qemu_buf to hold the whole of the device state. 2619 */ 2620 bioc = qio_channel_buffer_new(4096); 2621 qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer"); 2622 fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc)); 2623 object_unref(OBJECT(bioc)); 2624 2625 /* 2626 * Make sure the receiver can get incoming pages before we send the rest 2627 * of the state 2628 */ 2629 qemu_savevm_send_postcopy_listen(fb); 2630 2631 qemu_savevm_state_complete_precopy(fb, false, false); 2632 if (migrate_postcopy_ram()) { 2633 qemu_savevm_send_ping(fb, 3); 2634 } 2635 2636 qemu_savevm_send_postcopy_run(fb); 2637 2638 /* <><> end of stuff going into the package */ 2639 2640 /* Last point of recovery; as soon as we send the package the destination 2641 * can open devices and potentially start running. 2642 * Lets just check again we've not got any errors. 2643 */ 2644 ret = qemu_file_get_error(ms->to_dst_file); 2645 if (ret) { 2646 error_report("postcopy_start: Migration stream errored (pre package)"); 2647 goto fail_closefb; 2648 } 2649 2650 restart_block = false; 2651 2652 /* Now send that blob */ 2653 if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) { 2654 goto fail_closefb; 2655 } 2656 qemu_fclose(fb); 2657 2658 /* Send a notify to give a chance for anything that needs to happen 2659 * at the transition to postcopy and after the device state; in particular 2660 * spice needs to trigger a transition now 2661 */ 2662 ms->postcopy_after_devices = true; 2663 notifier_list_notify(&migration_state_notifiers, ms); 2664 2665 ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop; 2666 2667 qemu_mutex_unlock_iothread(); 2668 2669 if (migrate_postcopy_ram()) { 2670 /* 2671 * Although this ping is just for debug, it could potentially be 2672 * used for getting a better measurement of downtime at the source. 2673 */ 2674 qemu_savevm_send_ping(ms->to_dst_file, 4); 2675 } 2676 2677 if (migrate_release_ram()) { 2678 ram_postcopy_migrated_memory_release(ms); 2679 } 2680 2681 ret = qemu_file_get_error(ms->to_dst_file); 2682 if (ret) { 2683 error_report("postcopy_start: Migration stream errored"); 2684 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, 2685 MIGRATION_STATUS_FAILED); 2686 } 2687 2688 return ret; 2689 2690 fail_closefb: 2691 qemu_fclose(fb); 2692 fail: 2693 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, 2694 MIGRATION_STATUS_FAILED); 2695 if (restart_block) { 2696 /* A failure happened early enough that we know the destination hasn't 2697 * accessed block devices, so we're safe to recover. 2698 */ 2699 Error *local_err = NULL; 2700 2701 bdrv_invalidate_cache_all(&local_err); 2702 if (local_err) { 2703 error_report_err(local_err); 2704 } 2705 } 2706 qemu_mutex_unlock_iothread(); 2707 return -1; 2708 } 2709 2710 /** 2711 * migration_maybe_pause: Pause if required to by 2712 * migrate_pause_before_switchover called with the iothread locked 2713 * Returns: 0 on success 2714 */ 2715 static int migration_maybe_pause(MigrationState *s, 2716 int *current_active_state, 2717 int new_state) 2718 { 2719 if (!migrate_pause_before_switchover()) { 2720 return 0; 2721 } 2722 2723 /* Since leaving this state is not atomic with posting the semaphore 2724 * it's possible that someone could have issued multiple migrate_continue 2725 * and the semaphore is incorrectly positive at this point; 2726 * the docs say it's undefined to reinit a semaphore that's already 2727 * init'd, so use timedwait to eat up any existing posts. 2728 */ 2729 while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) { 2730 /* This block intentionally left blank */ 2731 } 2732 2733 qemu_mutex_unlock_iothread(); 2734 migrate_set_state(&s->state, *current_active_state, 2735 MIGRATION_STATUS_PRE_SWITCHOVER); 2736 qemu_sem_wait(&s->pause_sem); 2737 migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER, 2738 new_state); 2739 *current_active_state = new_state; 2740 qemu_mutex_lock_iothread(); 2741 2742 return s->state == new_state ? 0 : -EINVAL; 2743 } 2744 2745 /** 2746 * migration_completion: Used by migration_thread when there's not much left. 2747 * The caller 'breaks' the loop when this returns. 2748 * 2749 * @s: Current migration state 2750 */ 2751 static void migration_completion(MigrationState *s) 2752 { 2753 int ret; 2754 int current_active_state = s->state; 2755 2756 if (s->state == MIGRATION_STATUS_ACTIVE) { 2757 qemu_mutex_lock_iothread(); 2758 s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 2759 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); 2760 s->vm_was_running = runstate_is_running(); 2761 ret = global_state_store(); 2762 2763 if (!ret) { 2764 bool inactivate = !migrate_colo_enabled(); 2765 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); 2766 if (ret >= 0) { 2767 ret = migration_maybe_pause(s, ¤t_active_state, 2768 MIGRATION_STATUS_DEVICE); 2769 } 2770 if (ret >= 0) { 2771 qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); 2772 ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false, 2773 inactivate); 2774 } 2775 if (inactivate && ret >= 0) { 2776 s->block_inactive = true; 2777 } 2778 } 2779 qemu_mutex_unlock_iothread(); 2780 2781 if (ret < 0) { 2782 goto fail; 2783 } 2784 } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { 2785 trace_migration_completion_postcopy_end(); 2786 2787 qemu_savevm_state_complete_postcopy(s->to_dst_file); 2788 trace_migration_completion_postcopy_end_after_complete(); 2789 } 2790 2791 /* 2792 * If rp was opened we must clean up the thread before 2793 * cleaning everything else up (since if there are no failures 2794 * it will wait for the destination to send it's status in 2795 * a SHUT command). 2796 */ 2797 if (s->rp_state.from_dst_file) { 2798 int rp_error; 2799 trace_migration_return_path_end_before(); 2800 rp_error = await_return_path_close_on_source(s); 2801 trace_migration_return_path_end_after(rp_error); 2802 if (rp_error) { 2803 goto fail_invalidate; 2804 } 2805 } 2806 2807 if (qemu_file_get_error(s->to_dst_file)) { 2808 trace_migration_completion_file_err(); 2809 goto fail_invalidate; 2810 } 2811 2812 if (!migrate_colo_enabled()) { 2813 migrate_set_state(&s->state, current_active_state, 2814 MIGRATION_STATUS_COMPLETED); 2815 } 2816 2817 return; 2818 2819 fail_invalidate: 2820 /* If not doing postcopy, vm_start() will be called: let's regain 2821 * control on images. 2822 */ 2823 if (s->state == MIGRATION_STATUS_ACTIVE || 2824 s->state == MIGRATION_STATUS_DEVICE) { 2825 Error *local_err = NULL; 2826 2827 qemu_mutex_lock_iothread(); 2828 bdrv_invalidate_cache_all(&local_err); 2829 if (local_err) { 2830 error_report_err(local_err); 2831 } else { 2832 s->block_inactive = false; 2833 } 2834 qemu_mutex_unlock_iothread(); 2835 } 2836 2837 fail: 2838 migrate_set_state(&s->state, current_active_state, 2839 MIGRATION_STATUS_FAILED); 2840 } 2841 2842 bool migrate_colo_enabled(void) 2843 { 2844 MigrationState *s = migrate_get_current(); 2845 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO]; 2846 } 2847 2848 typedef enum MigThrError { 2849 /* No error detected */ 2850 MIG_THR_ERR_NONE = 0, 2851 /* Detected error, but resumed successfully */ 2852 MIG_THR_ERR_RECOVERED = 1, 2853 /* Detected fatal error, need to exit */ 2854 MIG_THR_ERR_FATAL = 2, 2855 } MigThrError; 2856 2857 static int postcopy_resume_handshake(MigrationState *s) 2858 { 2859 qemu_savevm_send_postcopy_resume(s->to_dst_file); 2860 2861 while (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { 2862 qemu_sem_wait(&s->rp_state.rp_sem); 2863 } 2864 2865 if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { 2866 return 0; 2867 } 2868 2869 return -1; 2870 } 2871 2872 /* Return zero if success, or <0 for error */ 2873 static int postcopy_do_resume(MigrationState *s) 2874 { 2875 int ret; 2876 2877 /* 2878 * Call all the resume_prepare() hooks, so that modules can be 2879 * ready for the migration resume. 2880 */ 2881 ret = qemu_savevm_state_resume_prepare(s); 2882 if (ret) { 2883 error_report("%s: resume_prepare() failure detected: %d", 2884 __func__, ret); 2885 return ret; 2886 } 2887 2888 /* 2889 * Last handshake with destination on the resume (destination will 2890 * switch to postcopy-active afterwards) 2891 */ 2892 ret = postcopy_resume_handshake(s); 2893 if (ret) { 2894 error_report("%s: handshake failed: %d", __func__, ret); 2895 return ret; 2896 } 2897 2898 return 0; 2899 } 2900 2901 /* 2902 * We don't return until we are in a safe state to continue current 2903 * postcopy migration. Returns MIG_THR_ERR_RECOVERED if recovered, or 2904 * MIG_THR_ERR_FATAL if unrecovery failure happened. 2905 */ 2906 static MigThrError postcopy_pause(MigrationState *s) 2907 { 2908 assert(s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); 2909 2910 while (true) { 2911 QEMUFile *file; 2912 2913 migrate_set_state(&s->state, s->state, 2914 MIGRATION_STATUS_POSTCOPY_PAUSED); 2915 2916 /* Current channel is possibly broken. Release it. */ 2917 assert(s->to_dst_file); 2918 qemu_mutex_lock(&s->qemu_file_lock); 2919 file = s->to_dst_file; 2920 s->to_dst_file = NULL; 2921 qemu_mutex_unlock(&s->qemu_file_lock); 2922 2923 qemu_file_shutdown(file); 2924 qemu_fclose(file); 2925 2926 error_report("Detected IO failure for postcopy. " 2927 "Migration paused."); 2928 2929 /* 2930 * We wait until things fixed up. Then someone will setup the 2931 * status back for us. 2932 */ 2933 while (s->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { 2934 qemu_sem_wait(&s->postcopy_pause_sem); 2935 } 2936 2937 if (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { 2938 /* Woken up by a recover procedure. Give it a shot */ 2939 2940 /* 2941 * Firstly, let's wake up the return path now, with a new 2942 * return path channel. 2943 */ 2944 qemu_sem_post(&s->postcopy_pause_rp_sem); 2945 2946 /* Do the resume logic */ 2947 if (postcopy_do_resume(s) == 0) { 2948 /* Let's continue! */ 2949 trace_postcopy_pause_continued(); 2950 return MIG_THR_ERR_RECOVERED; 2951 } else { 2952 /* 2953 * Something wrong happened during the recovery, let's 2954 * pause again. Pause is always better than throwing 2955 * data away. 2956 */ 2957 continue; 2958 } 2959 } else { 2960 /* This is not right... Time to quit. */ 2961 return MIG_THR_ERR_FATAL; 2962 } 2963 } 2964 } 2965 2966 static MigThrError migration_detect_error(MigrationState *s) 2967 { 2968 int ret; 2969 int state = s->state; 2970 2971 if (state == MIGRATION_STATUS_CANCELLING || 2972 state == MIGRATION_STATUS_CANCELLED) { 2973 /* End the migration, but don't set the state to failed */ 2974 return MIG_THR_ERR_FATAL; 2975 } 2976 2977 /* Try to detect any file errors */ 2978 ret = qemu_file_get_error(s->to_dst_file); 2979 2980 if (!ret) { 2981 /* Everything is fine */ 2982 return MIG_THR_ERR_NONE; 2983 } 2984 2985 if (state == MIGRATION_STATUS_POSTCOPY_ACTIVE && ret == -EIO) { 2986 /* 2987 * For postcopy, we allow the network to be down for a 2988 * while. After that, it can be continued by a 2989 * recovery phase. 2990 */ 2991 return postcopy_pause(s); 2992 } else { 2993 /* 2994 * For precopy (or postcopy with error outside IO), we fail 2995 * with no time. 2996 */ 2997 migrate_set_state(&s->state, state, MIGRATION_STATUS_FAILED); 2998 trace_migration_thread_file_err(); 2999 3000 /* Time to stop the migration, now. */ 3001 return MIG_THR_ERR_FATAL; 3002 } 3003 } 3004 3005 /* How many bytes have we transferred since the beggining of the migration */ 3006 static uint64_t migration_total_bytes(MigrationState *s) 3007 { 3008 return qemu_ftell(s->to_dst_file) + ram_counters.multifd_bytes; 3009 } 3010 3011 static void migration_calculate_complete(MigrationState *s) 3012 { 3013 uint64_t bytes = migration_total_bytes(s); 3014 int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 3015 int64_t transfer_time; 3016 3017 s->total_time = end_time - s->start_time; 3018 if (!s->downtime) { 3019 /* 3020 * It's still not set, so we are precopy migration. For 3021 * postcopy, downtime is calculated during postcopy_start(). 3022 */ 3023 s->downtime = end_time - s->downtime_start; 3024 } 3025 3026 transfer_time = s->total_time - s->setup_time; 3027 if (transfer_time) { 3028 s->mbps = ((double) bytes * 8.0) / transfer_time / 1000; 3029 } 3030 } 3031 3032 static void migration_update_counters(MigrationState *s, 3033 int64_t current_time) 3034 { 3035 uint64_t transferred, transferred_pages, time_spent; 3036 uint64_t current_bytes; /* bytes transferred since the beginning */ 3037 double bandwidth; 3038 3039 if (current_time < s->iteration_start_time + BUFFER_DELAY) { 3040 return; 3041 } 3042 3043 current_bytes = migration_total_bytes(s); 3044 transferred = current_bytes - s->iteration_initial_bytes; 3045 time_spent = current_time - s->iteration_start_time; 3046 bandwidth = (double)transferred / time_spent; 3047 s->threshold_size = bandwidth * s->parameters.downtime_limit; 3048 3049 s->mbps = (((double) transferred * 8.0) / 3050 ((double) time_spent / 1000.0)) / 1000.0 / 1000.0; 3051 3052 transferred_pages = ram_get_total_transferred_pages() - 3053 s->iteration_initial_pages; 3054 s->pages_per_second = (double) transferred_pages / 3055 (((double) time_spent / 1000.0)); 3056 3057 /* 3058 * if we haven't sent anything, we don't want to 3059 * recalculate. 10000 is a small enough number for our purposes 3060 */ 3061 if (ram_counters.dirty_pages_rate && transferred > 10000) { 3062 s->expected_downtime = ram_counters.remaining / bandwidth; 3063 } 3064 3065 qemu_file_reset_rate_limit(s->to_dst_file); 3066 3067 s->iteration_start_time = current_time; 3068 s->iteration_initial_bytes = current_bytes; 3069 s->iteration_initial_pages = ram_get_total_transferred_pages(); 3070 3071 trace_migrate_transferred(transferred, time_spent, 3072 bandwidth, s->threshold_size); 3073 } 3074 3075 /* Migration thread iteration status */ 3076 typedef enum { 3077 MIG_ITERATE_RESUME, /* Resume current iteration */ 3078 MIG_ITERATE_SKIP, /* Skip current iteration */ 3079 MIG_ITERATE_BREAK, /* Break the loop */ 3080 } MigIterateState; 3081 3082 /* 3083 * Return true if continue to the next iteration directly, false 3084 * otherwise. 3085 */ 3086 static MigIterateState migration_iteration_run(MigrationState *s) 3087 { 3088 uint64_t pending_size, pend_pre, pend_compat, pend_post; 3089 bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE; 3090 3091 qemu_savevm_state_pending(s->to_dst_file, s->threshold_size, &pend_pre, 3092 &pend_compat, &pend_post); 3093 pending_size = pend_pre + pend_compat + pend_post; 3094 3095 trace_migrate_pending(pending_size, s->threshold_size, 3096 pend_pre, pend_compat, pend_post); 3097 3098 if (pending_size && pending_size >= s->threshold_size) { 3099 /* Still a significant amount to transfer */ 3100 if (migrate_postcopy() && !in_postcopy && 3101 pend_pre <= s->threshold_size && 3102 atomic_read(&s->start_postcopy)) { 3103 if (postcopy_start(s)) { 3104 error_report("%s: postcopy failed to start", __func__); 3105 } 3106 return MIG_ITERATE_SKIP; 3107 } 3108 /* Just another iteration step */ 3109 qemu_savevm_state_iterate(s->to_dst_file, 3110 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); 3111 } else { 3112 trace_migration_thread_low_pending(pending_size); 3113 migration_completion(s); 3114 return MIG_ITERATE_BREAK; 3115 } 3116 3117 return MIG_ITERATE_RESUME; 3118 } 3119 3120 static void migration_iteration_finish(MigrationState *s) 3121 { 3122 /* If we enabled cpu throttling for auto-converge, turn it off. */ 3123 cpu_throttle_stop(); 3124 3125 qemu_mutex_lock_iothread(); 3126 switch (s->state) { 3127 case MIGRATION_STATUS_COMPLETED: 3128 migration_calculate_complete(s); 3129 runstate_set(RUN_STATE_POSTMIGRATE); 3130 break; 3131 3132 case MIGRATION_STATUS_ACTIVE: 3133 /* 3134 * We should really assert here, but since it's during 3135 * migration, let's try to reduce the usage of assertions. 3136 */ 3137 if (!migrate_colo_enabled()) { 3138 error_report("%s: critical error: calling COLO code without " 3139 "COLO enabled", __func__); 3140 } 3141 migrate_start_colo_process(s); 3142 /* 3143 * Fixme: we will run VM in COLO no matter its old running state. 3144 * After exited COLO, we will keep running. 3145 */ 3146 s->vm_was_running = true; 3147 /* Fallthrough */ 3148 case MIGRATION_STATUS_FAILED: 3149 case MIGRATION_STATUS_CANCELLED: 3150 case MIGRATION_STATUS_CANCELLING: 3151 if (s->vm_was_running) { 3152 vm_start(); 3153 } else { 3154 if (runstate_check(RUN_STATE_FINISH_MIGRATE)) { 3155 runstate_set(RUN_STATE_POSTMIGRATE); 3156 } 3157 } 3158 break; 3159 3160 default: 3161 /* Should not reach here, but if so, forgive the VM. */ 3162 error_report("%s: Unknown ending state %d", __func__, s->state); 3163 break; 3164 } 3165 migrate_fd_cleanup_schedule(s); 3166 qemu_mutex_unlock_iothread(); 3167 } 3168 3169 void migration_make_urgent_request(void) 3170 { 3171 qemu_sem_post(&migrate_get_current()->rate_limit_sem); 3172 } 3173 3174 void migration_consume_urgent_request(void) 3175 { 3176 qemu_sem_wait(&migrate_get_current()->rate_limit_sem); 3177 } 3178 3179 /* 3180 * Master migration thread on the source VM. 3181 * It drives the migration and pumps the data down the outgoing channel. 3182 */ 3183 static void *migration_thread(void *opaque) 3184 { 3185 MigrationState *s = opaque; 3186 int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); 3187 MigThrError thr_error; 3188 bool urgent = false; 3189 3190 rcu_register_thread(); 3191 3192 object_ref(OBJECT(s)); 3193 s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 3194 3195 qemu_savevm_state_header(s->to_dst_file); 3196 3197 /* 3198 * If we opened the return path, we need to make sure dst has it 3199 * opened as well. 3200 */ 3201 if (s->rp_state.from_dst_file) { 3202 /* Now tell the dest that it should open its end so it can reply */ 3203 qemu_savevm_send_open_return_path(s->to_dst_file); 3204 3205 /* And do a ping that will make stuff easier to debug */ 3206 qemu_savevm_send_ping(s->to_dst_file, 1); 3207 } 3208 3209 if (migrate_postcopy()) { 3210 /* 3211 * Tell the destination that we *might* want to do postcopy later; 3212 * if the other end can't do postcopy it should fail now, nice and 3213 * early. 3214 */ 3215 qemu_savevm_send_postcopy_advise(s->to_dst_file); 3216 } 3217 3218 if (migrate_colo_enabled()) { 3219 /* Notify migration destination that we enable COLO */ 3220 qemu_savevm_send_colo_enable(s->to_dst_file); 3221 } 3222 3223 qemu_savevm_state_setup(s->to_dst_file); 3224 3225 s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; 3226 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 3227 MIGRATION_STATUS_ACTIVE); 3228 3229 trace_migration_thread_setup_complete(); 3230 3231 while (s->state == MIGRATION_STATUS_ACTIVE || 3232 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { 3233 int64_t current_time; 3234 3235 if (urgent || !qemu_file_rate_limit(s->to_dst_file)) { 3236 MigIterateState iter_state = migration_iteration_run(s); 3237 if (iter_state == MIG_ITERATE_SKIP) { 3238 continue; 3239 } else if (iter_state == MIG_ITERATE_BREAK) { 3240 break; 3241 } 3242 } 3243 3244 /* 3245 * Try to detect any kind of failures, and see whether we 3246 * should stop the migration now. 3247 */ 3248 thr_error = migration_detect_error(s); 3249 if (thr_error == MIG_THR_ERR_FATAL) { 3250 /* Stop migration */ 3251 break; 3252 } else if (thr_error == MIG_THR_ERR_RECOVERED) { 3253 /* 3254 * Just recovered from a e.g. network failure, reset all 3255 * the local variables. This is important to avoid 3256 * breaking transferred_bytes and bandwidth calculation 3257 */ 3258 s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 3259 s->iteration_initial_bytes = 0; 3260 } 3261 3262 current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); 3263 3264 migration_update_counters(s, current_time); 3265 3266 urgent = false; 3267 if (qemu_file_rate_limit(s->to_dst_file)) { 3268 /* Wait for a delay to do rate limiting OR 3269 * something urgent to post the semaphore. 3270 */ 3271 int ms = s->iteration_start_time + BUFFER_DELAY - current_time; 3272 trace_migration_thread_ratelimit_pre(ms); 3273 if (qemu_sem_timedwait(&s->rate_limit_sem, ms) == 0) { 3274 /* We were worken by one or more urgent things but 3275 * the timedwait will have consumed one of them. 3276 * The service routine for the urgent wake will dec 3277 * the semaphore itself for each item it consumes, 3278 * so add this one we just eat back. 3279 */ 3280 qemu_sem_post(&s->rate_limit_sem); 3281 urgent = true; 3282 } 3283 trace_migration_thread_ratelimit_post(urgent); 3284 } 3285 } 3286 3287 trace_migration_thread_after_loop(); 3288 migration_iteration_finish(s); 3289 object_unref(OBJECT(s)); 3290 rcu_unregister_thread(); 3291 return NULL; 3292 } 3293 3294 void migrate_fd_connect(MigrationState *s, Error *error_in) 3295 { 3296 int64_t rate_limit; 3297 bool resume = s->state == MIGRATION_STATUS_POSTCOPY_PAUSED; 3298 3299 s->expected_downtime = s->parameters.downtime_limit; 3300 s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup_bh, s); 3301 if (error_in) { 3302 migrate_fd_error(s, error_in); 3303 migrate_fd_cleanup(s); 3304 return; 3305 } 3306 3307 if (resume) { 3308 /* This is a resumed migration */ 3309 rate_limit = INT64_MAX; 3310 } else { 3311 /* This is a fresh new migration */ 3312 rate_limit = s->parameters.max_bandwidth / XFER_LIMIT_RATIO; 3313 3314 /* Notify before starting migration thread */ 3315 notifier_list_notify(&migration_state_notifiers, s); 3316 } 3317 3318 qemu_file_set_rate_limit(s->to_dst_file, rate_limit); 3319 qemu_file_set_blocking(s->to_dst_file, true); 3320 3321 /* 3322 * Open the return path. For postcopy, it is used exclusively. For 3323 * precopy, only if user specified "return-path" capability would 3324 * QEMU uses the return path. 3325 */ 3326 if (migrate_postcopy_ram() || migrate_use_return_path()) { 3327 if (open_return_path_on_source(s, !resume)) { 3328 error_report("Unable to open return-path for postcopy"); 3329 migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED); 3330 migrate_fd_cleanup(s); 3331 return; 3332 } 3333 } 3334 3335 if (resume) { 3336 /* Wakeup the main migration thread to do the recovery */ 3337 migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_PAUSED, 3338 MIGRATION_STATUS_POSTCOPY_RECOVER); 3339 qemu_sem_post(&s->postcopy_pause_sem); 3340 return; 3341 } 3342 3343 if (multifd_save_setup() != 0) { 3344 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, 3345 MIGRATION_STATUS_FAILED); 3346 migrate_fd_cleanup(s); 3347 return; 3348 } 3349 qemu_thread_create(&s->thread, "live_migration", migration_thread, s, 3350 QEMU_THREAD_JOINABLE); 3351 s->migration_thread_running = true; 3352 } 3353 3354 void migration_global_dump(Monitor *mon) 3355 { 3356 MigrationState *ms = migrate_get_current(); 3357 3358 monitor_printf(mon, "globals:\n"); 3359 monitor_printf(mon, "store-global-state: %s\n", 3360 ms->store_global_state ? "on" : "off"); 3361 monitor_printf(mon, "only-migratable: %s\n", 3362 only_migratable ? "on" : "off"); 3363 monitor_printf(mon, "send-configuration: %s\n", 3364 ms->send_configuration ? "on" : "off"); 3365 monitor_printf(mon, "send-section-footer: %s\n", 3366 ms->send_section_footer ? "on" : "off"); 3367 monitor_printf(mon, "decompress-error-check: %s\n", 3368 ms->decompress_error_check ? "on" : "off"); 3369 monitor_printf(mon, "clear-bitmap-shift: %u\n", 3370 ms->clear_bitmap_shift); 3371 } 3372 3373 #define DEFINE_PROP_MIG_CAP(name, x) \ 3374 DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false) 3375 3376 static Property migration_properties[] = { 3377 DEFINE_PROP_BOOL("store-global-state", MigrationState, 3378 store_global_state, true), 3379 DEFINE_PROP_BOOL("send-configuration", MigrationState, 3380 send_configuration, true), 3381 DEFINE_PROP_BOOL("send-section-footer", MigrationState, 3382 send_section_footer, true), 3383 DEFINE_PROP_BOOL("decompress-error-check", MigrationState, 3384 decompress_error_check, true), 3385 DEFINE_PROP_UINT8("x-clear-bitmap-shift", MigrationState, 3386 clear_bitmap_shift, CLEAR_BITMAP_SHIFT_DEFAULT), 3387 3388 /* Migration parameters */ 3389 DEFINE_PROP_UINT8("x-compress-level", MigrationState, 3390 parameters.compress_level, 3391 DEFAULT_MIGRATE_COMPRESS_LEVEL), 3392 DEFINE_PROP_UINT8("x-compress-threads", MigrationState, 3393 parameters.compress_threads, 3394 DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT), 3395 DEFINE_PROP_BOOL("x-compress-wait-thread", MigrationState, 3396 parameters.compress_wait_thread, true), 3397 DEFINE_PROP_UINT8("x-decompress-threads", MigrationState, 3398 parameters.decompress_threads, 3399 DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT), 3400 DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState, 3401 parameters.cpu_throttle_initial, 3402 DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL), 3403 DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState, 3404 parameters.cpu_throttle_increment, 3405 DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT), 3406 DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState, 3407 parameters.max_bandwidth, MAX_THROTTLE), 3408 DEFINE_PROP_UINT64("x-downtime-limit", MigrationState, 3409 parameters.downtime_limit, 3410 DEFAULT_MIGRATE_SET_DOWNTIME), 3411 DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState, 3412 parameters.x_checkpoint_delay, 3413 DEFAULT_MIGRATE_X_CHECKPOINT_DELAY), 3414 DEFINE_PROP_UINT8("multifd-channels", MigrationState, 3415 parameters.multifd_channels, 3416 DEFAULT_MIGRATE_MULTIFD_CHANNELS), 3417 DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState, 3418 parameters.xbzrle_cache_size, 3419 DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE), 3420 DEFINE_PROP_SIZE("max-postcopy-bandwidth", MigrationState, 3421 parameters.max_postcopy_bandwidth, 3422 DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH), 3423 DEFINE_PROP_UINT8("max-cpu-throttle", MigrationState, 3424 parameters.max_cpu_throttle, 3425 DEFAULT_MIGRATE_MAX_CPU_THROTTLE), 3426 DEFINE_PROP_SIZE("announce-initial", MigrationState, 3427 parameters.announce_initial, 3428 DEFAULT_MIGRATE_ANNOUNCE_INITIAL), 3429 DEFINE_PROP_SIZE("announce-max", MigrationState, 3430 parameters.announce_max, 3431 DEFAULT_MIGRATE_ANNOUNCE_MAX), 3432 DEFINE_PROP_SIZE("announce-rounds", MigrationState, 3433 parameters.announce_rounds, 3434 DEFAULT_MIGRATE_ANNOUNCE_ROUNDS), 3435 DEFINE_PROP_SIZE("announce-step", MigrationState, 3436 parameters.announce_step, 3437 DEFAULT_MIGRATE_ANNOUNCE_STEP), 3438 3439 /* Migration capabilities */ 3440 DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), 3441 DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL), 3442 DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE), 3443 DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS), 3444 DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS), 3445 DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS), 3446 DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM), 3447 DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO), 3448 DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM), 3449 DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK), 3450 DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH), 3451 DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_MULTIFD), 3452 3453 DEFINE_PROP_END_OF_LIST(), 3454 }; 3455 3456 static void migration_class_init(ObjectClass *klass, void *data) 3457 { 3458 DeviceClass *dc = DEVICE_CLASS(klass); 3459 3460 dc->user_creatable = false; 3461 dc->props = migration_properties; 3462 } 3463 3464 static void migration_instance_finalize(Object *obj) 3465 { 3466 MigrationState *ms = MIGRATION_OBJ(obj); 3467 MigrationParameters *params = &ms->parameters; 3468 3469 qemu_mutex_destroy(&ms->error_mutex); 3470 qemu_mutex_destroy(&ms->qemu_file_lock); 3471 g_free(params->tls_hostname); 3472 g_free(params->tls_creds); 3473 qemu_sem_destroy(&ms->rate_limit_sem); 3474 qemu_sem_destroy(&ms->pause_sem); 3475 qemu_sem_destroy(&ms->postcopy_pause_sem); 3476 qemu_sem_destroy(&ms->postcopy_pause_rp_sem); 3477 qemu_sem_destroy(&ms->rp_state.rp_sem); 3478 error_free(ms->error); 3479 } 3480 3481 static void migration_instance_init(Object *obj) 3482 { 3483 MigrationState *ms = MIGRATION_OBJ(obj); 3484 MigrationParameters *params = &ms->parameters; 3485 3486 ms->state = MIGRATION_STATUS_NONE; 3487 ms->mbps = -1; 3488 ms->pages_per_second = -1; 3489 qemu_sem_init(&ms->pause_sem, 0); 3490 qemu_mutex_init(&ms->error_mutex); 3491 3492 params->tls_hostname = g_strdup(""); 3493 params->tls_creds = g_strdup(""); 3494 3495 /* Set has_* up only for parameter checks */ 3496 params->has_compress_level = true; 3497 params->has_compress_threads = true; 3498 params->has_decompress_threads = true; 3499 params->has_cpu_throttle_initial = true; 3500 params->has_cpu_throttle_increment = true; 3501 params->has_max_bandwidth = true; 3502 params->has_downtime_limit = true; 3503 params->has_x_checkpoint_delay = true; 3504 params->has_block_incremental = true; 3505 params->has_multifd_channels = true; 3506 params->has_xbzrle_cache_size = true; 3507 params->has_max_postcopy_bandwidth = true; 3508 params->has_max_cpu_throttle = true; 3509 params->has_announce_initial = true; 3510 params->has_announce_max = true; 3511 params->has_announce_rounds = true; 3512 params->has_announce_step = true; 3513 3514 qemu_sem_init(&ms->postcopy_pause_sem, 0); 3515 qemu_sem_init(&ms->postcopy_pause_rp_sem, 0); 3516 qemu_sem_init(&ms->rp_state.rp_sem, 0); 3517 qemu_sem_init(&ms->rate_limit_sem, 0); 3518 qemu_mutex_init(&ms->qemu_file_lock); 3519 } 3520 3521 /* 3522 * Return true if check pass, false otherwise. Error will be put 3523 * inside errp if provided. 3524 */ 3525 static bool migration_object_check(MigrationState *ms, Error **errp) 3526 { 3527 MigrationCapabilityStatusList *head = NULL; 3528 /* Assuming all off */ 3529 bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret; 3530 int i; 3531 3532 if (!migrate_params_check(&ms->parameters, errp)) { 3533 return false; 3534 } 3535 3536 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { 3537 if (ms->enabled_capabilities[i]) { 3538 head = migrate_cap_add(head, i, true); 3539 } 3540 } 3541 3542 ret = migrate_caps_check(cap_list, head, errp); 3543 3544 /* It works with head == NULL */ 3545 qapi_free_MigrationCapabilityStatusList(head); 3546 3547 return ret; 3548 } 3549 3550 static const TypeInfo migration_type = { 3551 .name = TYPE_MIGRATION, 3552 /* 3553 * NOTE: TYPE_MIGRATION is not really a device, as the object is 3554 * not created using qdev_create(), it is not attached to the qdev 3555 * device tree, and it is never realized. 3556 * 3557 * TODO: Make this TYPE_OBJECT once QOM provides something like 3558 * TYPE_DEVICE's "-global" properties. 3559 */ 3560 .parent = TYPE_DEVICE, 3561 .class_init = migration_class_init, 3562 .class_size = sizeof(MigrationClass), 3563 .instance_size = sizeof(MigrationState), 3564 .instance_init = migration_instance_init, 3565 .instance_finalize = migration_instance_finalize, 3566 }; 3567 3568 static void register_migration_types(void) 3569 { 3570 type_register_static(&migration_type); 3571 } 3572 3573 type_init(register_migration_types); 3574