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16#include "qemu/osdep.h"
17#include "qemu/cutils.h"
18#include "qemu/error-report.h"
19#include "migration/blocker.h"
20#include "exec.h"
21#include "fd.h"
22#include "socket.h"
23#include "rdma.h"
24#include "ram.h"
25#include "migration/global_state.h"
26#include "migration/misc.h"
27#include "migration.h"
28#include "savevm.h"
29#include "qemu-file-channel.h"
30#include "qemu-file.h"
31#include "migration/vmstate.h"
32#include "block/block.h"
33#include "qapi/error.h"
34#include "qapi/qapi-commands-migration.h"
35#include "qapi/qapi-events-migration.h"
36#include "qapi/qmp/qerror.h"
37#include "qapi/qmp/qnull.h"
38#include "qemu/rcu.h"
39#include "block.h"
40#include "postcopy-ram.h"
41#include "qemu/thread.h"
42#include "trace.h"
43#include "exec/target_page.h"
44#include "io/channel-buffer.h"
45#include "migration/colo.h"
46#include "hw/boards.h"
47#include "monitor/monitor.h"
48
49#define MAX_THROTTLE (32 << 20)
50
51
52
53#define BUFFER_DELAY 100
54#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
55
56
57
58#define DEFAULT_MIGRATE_SET_DOWNTIME 300
59
60
61#define MAX_MIGRATE_DOWNTIME_SECONDS 2000
62#define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
63
64
65#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
66
67
68#define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
69
70#define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
71
72#define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
73#define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
74
75
76#define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024)
77
78
79
80
81#define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200
82#define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
83#define DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT 16
84
85static NotifierList migration_state_notifiers =
86 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
87
88static bool deferred_incoming;
89
90
91enum mig_rp_message_type {
92 MIG_RP_MSG_INVALID = 0,
93 MIG_RP_MSG_SHUT,
94 MIG_RP_MSG_PONG,
95
96 MIG_RP_MSG_REQ_PAGES_ID,
97 MIG_RP_MSG_REQ_PAGES,
98
99 MIG_RP_MSG_MAX
100};
101
102
103
104
105
106static MigrationState *current_migration;
107
108static bool migration_object_check(MigrationState *ms, Error **errp);
109static int migration_maybe_pause(MigrationState *s,
110 int *current_active_state,
111 int new_state);
112
113void migration_object_init(void)
114{
115 MachineState *ms = MACHINE(qdev_get_machine());
116 Error *err = NULL;
117
118
119 assert(!current_migration);
120 current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION));
121
122 if (!migration_object_check(current_migration, &err)) {
123 error_report_err(err);
124 exit(1);
125 }
126
127
128
129
130
131
132 if (ms->enforce_config_section) {
133 current_migration->send_configuration = true;
134 }
135}
136
137void migration_object_finalize(void)
138{
139 object_unref(OBJECT(current_migration));
140}
141
142
143MigrationState *migrate_get_current(void)
144{
145
146 assert(current_migration);
147 return current_migration;
148}
149
150MigrationIncomingState *migration_incoming_get_current(void)
151{
152 static bool once;
153 static MigrationIncomingState mis_current;
154
155 if (!once) {
156 mis_current.state = MIGRATION_STATUS_NONE;
157 memset(&mis_current, 0, sizeof(MigrationIncomingState));
158 mis_current.postcopy_remote_fds = g_array_new(FALSE, TRUE,
159 sizeof(struct PostCopyFD));
160 qemu_mutex_init(&mis_current.rp_mutex);
161 qemu_event_init(&mis_current.main_thread_load_event, false);
162
163 init_dirty_bitmap_incoming_migration();
164
165 once = true;
166 }
167 return &mis_current;
168}
169
170void migration_incoming_state_destroy(void)
171{
172 struct MigrationIncomingState *mis = migration_incoming_get_current();
173
174 if (mis->to_src_file) {
175
176 migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0);
177 qemu_fclose(mis->to_src_file);
178 mis->to_src_file = NULL;
179 }
180
181 if (mis->from_src_file) {
182 qemu_fclose(mis->from_src_file);
183 mis->from_src_file = NULL;
184 }
185 if (mis->postcopy_remote_fds) {
186 g_array_free(mis->postcopy_remote_fds, TRUE);
187 mis->postcopy_remote_fds = NULL;
188 }
189
190 qemu_event_reset(&mis->main_thread_load_event);
191}
192
193static void migrate_generate_event(int new_state)
194{
195 if (migrate_use_events()) {
196 qapi_event_send_migration(new_state, &error_abort);
197 }
198}
199
200
201
202
203
204
205static void deferred_incoming_migration(Error **errp)
206{
207 if (deferred_incoming) {
208 error_setg(errp, "Incoming migration already deferred");
209 }
210 deferred_incoming = true;
211}
212
213
214
215
216
217static int migrate_send_rp_message(MigrationIncomingState *mis,
218 enum mig_rp_message_type message_type,
219 uint16_t len, void *data)
220{
221 int ret = 0;
222
223 trace_migrate_send_rp_message((int)message_type, len);
224 qemu_mutex_lock(&mis->rp_mutex);
225
226
227
228
229
230 if (!mis->to_src_file) {
231 ret = -EIO;
232 goto error;
233 }
234
235 qemu_put_be16(mis->to_src_file, (unsigned int)message_type);
236 qemu_put_be16(mis->to_src_file, len);
237 qemu_put_buffer(mis->to_src_file, data, len);
238 qemu_fflush(mis->to_src_file);
239
240
241 ret = qemu_file_get_error(mis->to_src_file);
242
243error:
244 qemu_mutex_unlock(&mis->rp_mutex);
245 return ret;
246}
247
248
249
250
251
252
253
254
255int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname,
256 ram_addr_t start, size_t len)
257{
258 uint8_t bufc[12 + 1 + 255];
259 size_t msglen = 12;
260 enum mig_rp_message_type msg_type;
261
262 *(uint64_t *)bufc = cpu_to_be64((uint64_t)start);
263 *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len);
264
265 if (rbname) {
266 int rbname_len = strlen(rbname);
267 assert(rbname_len < 256);
268
269 bufc[msglen++] = rbname_len;
270 memcpy(bufc + msglen, rbname, rbname_len);
271 msglen += rbname_len;
272 msg_type = MIG_RP_MSG_REQ_PAGES_ID;
273 } else {
274 msg_type = MIG_RP_MSG_REQ_PAGES;
275 }
276
277 return migrate_send_rp_message(mis, msg_type, msglen, bufc);
278}
279
280void qemu_start_incoming_migration(const char *uri, Error **errp)
281{
282 const char *p;
283
284 qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort);
285 if (!strcmp(uri, "defer")) {
286 deferred_incoming_migration(errp);
287 } else if (strstart(uri, "tcp:", &p)) {
288 tcp_start_incoming_migration(p, errp);
289#ifdef CONFIG_RDMA
290 } else if (strstart(uri, "rdma:", &p)) {
291 rdma_start_incoming_migration(p, errp);
292#endif
293 } else if (strstart(uri, "exec:", &p)) {
294 exec_start_incoming_migration(p, errp);
295 } else if (strstart(uri, "unix:", &p)) {
296 unix_start_incoming_migration(p, errp);
297 } else if (strstart(uri, "fd:", &p)) {
298 fd_start_incoming_migration(p, errp);
299 } else {
300 error_setg(errp, "unknown migration protocol: %s", uri);
301 }
302}
303
304static void process_incoming_migration_bh(void *opaque)
305{
306 Error *local_err = NULL;
307 MigrationIncomingState *mis = opaque;
308
309
310
311 bdrv_invalidate_cache_all(&local_err);
312 if (local_err) {
313 error_report_err(local_err);
314 local_err = NULL;
315 autostart = false;
316 }
317
318
319
320
321
322 qemu_announce_self();
323
324 if (multifd_load_cleanup(&local_err) != 0) {
325 error_report_err(local_err);
326 autostart = false;
327 }
328
329
330
331
332 dirty_bitmap_mig_before_vm_start();
333
334 if (!global_state_received() ||
335 global_state_get_runstate() == RUN_STATE_RUNNING) {
336 if (autostart) {
337 vm_start();
338 } else {
339 runstate_set(RUN_STATE_PAUSED);
340 }
341 } else {
342 runstate_set(global_state_get_runstate());
343 }
344
345
346
347
348
349 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
350 MIGRATION_STATUS_COMPLETED);
351 qemu_bh_delete(mis->bh);
352 migration_incoming_state_destroy();
353}
354
355static void process_incoming_migration_co(void *opaque)
356{
357 MigrationIncomingState *mis = migration_incoming_get_current();
358 PostcopyState ps;
359 int ret;
360
361 assert(mis->from_src_file);
362 mis->largest_page_size = qemu_ram_pagesize_largest();
363 postcopy_state_set(POSTCOPY_INCOMING_NONE);
364 migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
365 MIGRATION_STATUS_ACTIVE);
366 ret = qemu_loadvm_state(mis->from_src_file);
367
368 ps = postcopy_state_get();
369 trace_process_incoming_migration_co_end(ret, ps);
370 if (ps != POSTCOPY_INCOMING_NONE) {
371 if (ps == POSTCOPY_INCOMING_ADVISE) {
372
373
374
375
376
377 postcopy_ram_incoming_cleanup(mis);
378 } else if (ret >= 0) {
379
380
381
382
383 trace_process_incoming_migration_co_postcopy_end_main();
384 return;
385 }
386
387 }
388
389
390 if (!ret && migration_incoming_enable_colo()) {
391 mis->migration_incoming_co = qemu_coroutine_self();
392 qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming",
393 colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE);
394 mis->have_colo_incoming_thread = true;
395 qemu_coroutine_yield();
396
397
398 qemu_thread_join(&mis->colo_incoming_thread);
399 }
400
401 if (ret < 0) {
402 Error *local_err = NULL;
403
404 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
405 MIGRATION_STATUS_FAILED);
406 error_report("load of migration failed: %s", strerror(-ret));
407 qemu_fclose(mis->from_src_file);
408 if (multifd_load_cleanup(&local_err) != 0) {
409 error_report_err(local_err);
410 }
411 exit(EXIT_FAILURE);
412 }
413 mis->bh = qemu_bh_new(process_incoming_migration_bh, mis);
414 qemu_bh_schedule(mis->bh);
415}
416
417static void migration_incoming_setup(QEMUFile *f)
418{
419 MigrationIncomingState *mis = migration_incoming_get_current();
420
421 if (multifd_load_setup() != 0) {
422
423
424 exit(EXIT_FAILURE);
425 }
426
427 if (!mis->from_src_file) {
428 mis->from_src_file = f;
429 }
430 qemu_file_set_blocking(f, false);
431}
432
433static void migration_incoming_process(void)
434{
435 Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL);
436 qemu_coroutine_enter(co);
437}
438
439void migration_fd_process_incoming(QEMUFile *f)
440{
441 migration_incoming_setup(f);
442 migration_incoming_process();
443}
444
445void migration_ioc_process_incoming(QIOChannel *ioc)
446{
447 MigrationIncomingState *mis = migration_incoming_get_current();
448
449 if (!mis->from_src_file) {
450 QEMUFile *f = qemu_fopen_channel_input(ioc);
451 migration_fd_process_incoming(f);
452 }
453
454}
455
456
457
458
459
460
461
462bool migration_has_all_channels(void)
463{
464 return true;
465}
466
467
468
469
470
471
472void migrate_send_rp_shut(MigrationIncomingState *mis,
473 uint32_t value)
474{
475 uint32_t buf;
476
477 buf = cpu_to_be32(value);
478 migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf);
479}
480
481
482
483
484
485void migrate_send_rp_pong(MigrationIncomingState *mis,
486 uint32_t value)
487{
488 uint32_t buf;
489
490 buf = cpu_to_be32(value);
491 migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf);
492}
493
494MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
495{
496 MigrationCapabilityStatusList *head = NULL;
497 MigrationCapabilityStatusList *caps;
498 MigrationState *s = migrate_get_current();
499 int i;
500
501 caps = NULL;
502 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
503#ifndef CONFIG_LIVE_BLOCK_MIGRATION
504 if (i == MIGRATION_CAPABILITY_BLOCK) {
505 continue;
506 }
507#endif
508 if (head == NULL) {
509 head = g_malloc0(sizeof(*caps));
510 caps = head;
511 } else {
512 caps->next = g_malloc0(sizeof(*caps));
513 caps = caps->next;
514 }
515 caps->value =
516 g_malloc(sizeof(*caps->value));
517 caps->value->capability = i;
518 caps->value->state = s->enabled_capabilities[i];
519 }
520
521 return head;
522}
523
524MigrationParameters *qmp_query_migrate_parameters(Error **errp)
525{
526 MigrationParameters *params;
527 MigrationState *s = migrate_get_current();
528
529
530 params = g_malloc0(sizeof(*params));
531 params->has_compress_level = true;
532 params->compress_level = s->parameters.compress_level;
533 params->has_compress_threads = true;
534 params->compress_threads = s->parameters.compress_threads;
535 params->has_decompress_threads = true;
536 params->decompress_threads = s->parameters.decompress_threads;
537 params->has_cpu_throttle_initial = true;
538 params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
539 params->has_cpu_throttle_increment = true;
540 params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
541 params->has_tls_creds = true;
542 params->tls_creds = g_strdup(s->parameters.tls_creds);
543 params->has_tls_hostname = true;
544 params->tls_hostname = g_strdup(s->parameters.tls_hostname);
545 params->has_max_bandwidth = true;
546 params->max_bandwidth = s->parameters.max_bandwidth;
547 params->has_downtime_limit = true;
548 params->downtime_limit = s->parameters.downtime_limit;
549 params->has_x_checkpoint_delay = true;
550 params->x_checkpoint_delay = s->parameters.x_checkpoint_delay;
551 params->has_block_incremental = true;
552 params->block_incremental = s->parameters.block_incremental;
553 params->has_x_multifd_channels = true;
554 params->x_multifd_channels = s->parameters.x_multifd_channels;
555 params->has_x_multifd_page_count = true;
556 params->x_multifd_page_count = s->parameters.x_multifd_page_count;
557 params->has_xbzrle_cache_size = true;
558 params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
559
560 return params;
561}
562
563
564
565
566
567static bool migration_is_setup_or_active(int state)
568{
569 switch (state) {
570 case MIGRATION_STATUS_ACTIVE:
571 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
572 case MIGRATION_STATUS_SETUP:
573 case MIGRATION_STATUS_PRE_SWITCHOVER:
574 case MIGRATION_STATUS_DEVICE:
575 return true;
576
577 default:
578 return false;
579
580 }
581}
582
583static void populate_ram_info(MigrationInfo *info, MigrationState *s)
584{
585 info->has_ram = true;
586 info->ram = g_malloc0(sizeof(*info->ram));
587 info->ram->transferred = ram_counters.transferred;
588 info->ram->total = ram_bytes_total();
589 info->ram->duplicate = ram_counters.duplicate;
590
591 info->ram->skipped = 0;
592 info->ram->normal = ram_counters.normal;
593 info->ram->normal_bytes = ram_counters.normal *
594 qemu_target_page_size();
595 info->ram->mbps = s->mbps;
596 info->ram->dirty_sync_count = ram_counters.dirty_sync_count;
597 info->ram->postcopy_requests = ram_counters.postcopy_requests;
598 info->ram->page_size = qemu_target_page_size();
599
600 if (migrate_use_xbzrle()) {
601 info->has_xbzrle_cache = true;
602 info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
603 info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
604 info->xbzrle_cache->bytes = xbzrle_counters.bytes;
605 info->xbzrle_cache->pages = xbzrle_counters.pages;
606 info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss;
607 info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate;
608 info->xbzrle_cache->overflow = xbzrle_counters.overflow;
609 }
610
611 if (cpu_throttle_active()) {
612 info->has_cpu_throttle_percentage = true;
613 info->cpu_throttle_percentage = cpu_throttle_get_percentage();
614 }
615
616 if (s->state != MIGRATION_STATUS_COMPLETED) {
617 info->ram->remaining = ram_bytes_remaining();
618 info->ram->dirty_pages_rate = ram_counters.dirty_pages_rate;
619 }
620}
621
622static void populate_disk_info(MigrationInfo *info)
623{
624 if (blk_mig_active()) {
625 info->has_disk = true;
626 info->disk = g_malloc0(sizeof(*info->disk));
627 info->disk->transferred = blk_mig_bytes_transferred();
628 info->disk->remaining = blk_mig_bytes_remaining();
629 info->disk->total = blk_mig_bytes_total();
630 }
631}
632
633MigrationInfo *qmp_query_migrate(Error **errp)
634{
635 MigrationInfo *info = g_malloc0(sizeof(*info));
636 MigrationState *s = migrate_get_current();
637
638 switch (s->state) {
639 case MIGRATION_STATUS_NONE:
640
641 break;
642 case MIGRATION_STATUS_SETUP:
643 info->has_status = true;
644 info->has_total_time = false;
645 break;
646 case MIGRATION_STATUS_ACTIVE:
647 case MIGRATION_STATUS_CANCELLING:
648 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
649 case MIGRATION_STATUS_PRE_SWITCHOVER:
650 case MIGRATION_STATUS_DEVICE:
651
652 info->has_status = true;
653 info->has_total_time = true;
654 info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
655 - s->start_time;
656 info->has_expected_downtime = true;
657 info->expected_downtime = s->expected_downtime;
658 info->has_setup_time = true;
659 info->setup_time = s->setup_time;
660
661 populate_ram_info(info, s);
662 populate_disk_info(info);
663 break;
664 case MIGRATION_STATUS_COLO:
665 info->has_status = true;
666
667 break;
668 case MIGRATION_STATUS_COMPLETED:
669 info->has_status = true;
670 info->has_total_time = true;
671 info->total_time = s->total_time;
672 info->has_downtime = true;
673 info->downtime = s->downtime;
674 info->has_setup_time = true;
675 info->setup_time = s->setup_time;
676
677 populate_ram_info(info, s);
678 break;
679 case MIGRATION_STATUS_FAILED:
680 info->has_status = true;
681 if (s->error) {
682 info->has_error_desc = true;
683 info->error_desc = g_strdup(error_get_pretty(s->error));
684 }
685 break;
686 case MIGRATION_STATUS_CANCELLED:
687 info->has_status = true;
688 break;
689 }
690 info->status = s->state;
691
692 return info;
693}
694
695
696
697
698
699
700
701
702
703
704static bool migrate_caps_check(bool *cap_list,
705 MigrationCapabilityStatusList *params,
706 Error **errp)
707{
708 MigrationCapabilityStatusList *cap;
709 bool old_postcopy_cap;
710 MigrationIncomingState *mis = migration_incoming_get_current();
711
712 old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM];
713
714 for (cap = params; cap; cap = cap->next) {
715 cap_list[cap->value->capability] = cap->value->state;
716 }
717
718#ifndef CONFIG_LIVE_BLOCK_MIGRATION
719 if (cap_list[MIGRATION_CAPABILITY_BLOCK]) {
720 error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
721 "block migration");
722 error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
723 return false;
724 }
725#endif
726
727 if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
728 if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) {
729
730
731
732
733
734 error_setg(errp, "Postcopy is not currently compatible "
735 "with compression");
736 return false;
737 }
738
739
740
741
742
743 if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) &&
744 !postcopy_ram_supported_by_host(mis)) {
745
746
747
748 error_setg(errp, "Postcopy is not supported");
749 return false;
750 }
751 }
752
753 return true;
754}
755
756void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
757 Error **errp)
758{
759 MigrationState *s = migrate_get_current();
760 MigrationCapabilityStatusList *cap;
761 bool cap_list[MIGRATION_CAPABILITY__MAX];
762
763 if (migration_is_setup_or_active(s->state)) {
764 error_setg(errp, QERR_MIGRATION_ACTIVE);
765 return;
766 }
767
768 memcpy(cap_list, s->enabled_capabilities, sizeof(cap_list));
769 if (!migrate_caps_check(cap_list, params, errp)) {
770 return;
771 }
772
773 for (cap = params; cap; cap = cap->next) {
774 s->enabled_capabilities[cap->value->capability] = cap->value->state;
775 }
776}
777
778
779
780
781
782static bool migrate_params_check(MigrationParameters *params, Error **errp)
783{
784 if (params->has_compress_level &&
785 (params->compress_level > 9)) {
786 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
787 "is invalid, it should be in the range of 0 to 9");
788 return false;
789 }
790
791 if (params->has_compress_threads && (params->compress_threads < 1)) {
792 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
793 "compress_threads",
794 "is invalid, it should be in the range of 1 to 255");
795 return false;
796 }
797
798 if (params->has_decompress_threads && (params->decompress_threads < 1)) {
799 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
800 "decompress_threads",
801 "is invalid, it should be in the range of 1 to 255");
802 return false;
803 }
804
805 if (params->has_cpu_throttle_initial &&
806 (params->cpu_throttle_initial < 1 ||
807 params->cpu_throttle_initial > 99)) {
808 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
809 "cpu_throttle_initial",
810 "an integer in the range of 1 to 99");
811 return false;
812 }
813
814 if (params->has_cpu_throttle_increment &&
815 (params->cpu_throttle_increment < 1 ||
816 params->cpu_throttle_increment > 99)) {
817 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
818 "cpu_throttle_increment",
819 "an integer in the range of 1 to 99");
820 return false;
821 }
822
823 if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) {
824 error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the"
825 " range of 0 to %zu bytes/second", SIZE_MAX);
826 return false;
827 }
828
829 if (params->has_downtime_limit &&
830 (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
831 error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
832 "the range of 0 to %d milliseconds",
833 MAX_MIGRATE_DOWNTIME);
834 return false;
835 }
836
837
838
839 if (params->has_x_multifd_channels && (params->x_multifd_channels < 1)) {
840 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
841 "multifd_channels",
842 "is invalid, it should be in the range of 1 to 255");
843 return false;
844 }
845 if (params->has_x_multifd_page_count &&
846 (params->x_multifd_page_count < 1 ||
847 params->x_multifd_page_count > 10000)) {
848 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
849 "multifd_page_count",
850 "is invalid, it should be in the range of 1 to 10000");
851 return false;
852 }
853
854 if (params->has_xbzrle_cache_size &&
855 (params->xbzrle_cache_size < qemu_target_page_size() ||
856 !is_power_of_2(params->xbzrle_cache_size))) {
857 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
858 "xbzrle_cache_size",
859 "is invalid, it should be bigger than target page size"
860 " and a power of two");
861 return false;
862 }
863
864 return true;
865}
866
867static void migrate_params_test_apply(MigrateSetParameters *params,
868 MigrationParameters *dest)
869{
870 *dest = migrate_get_current()->parameters;
871
872
873
874 if (params->has_compress_level) {
875 dest->compress_level = params->compress_level;
876 }
877
878 if (params->has_compress_threads) {
879 dest->compress_threads = params->compress_threads;
880 }
881
882 if (params->has_decompress_threads) {
883 dest->decompress_threads = params->decompress_threads;
884 }
885
886 if (params->has_cpu_throttle_initial) {
887 dest->cpu_throttle_initial = params->cpu_throttle_initial;
888 }
889
890 if (params->has_cpu_throttle_increment) {
891 dest->cpu_throttle_increment = params->cpu_throttle_increment;
892 }
893
894 if (params->has_tls_creds) {
895 assert(params->tls_creds->type == QTYPE_QSTRING);
896 dest->tls_creds = g_strdup(params->tls_creds->u.s);
897 }
898
899 if (params->has_tls_hostname) {
900 assert(params->tls_hostname->type == QTYPE_QSTRING);
901 dest->tls_hostname = g_strdup(params->tls_hostname->u.s);
902 }
903
904 if (params->has_max_bandwidth) {
905 dest->max_bandwidth = params->max_bandwidth;
906 }
907
908 if (params->has_downtime_limit) {
909 dest->downtime_limit = params->downtime_limit;
910 }
911
912 if (params->has_x_checkpoint_delay) {
913 dest->x_checkpoint_delay = params->x_checkpoint_delay;
914 }
915
916 if (params->has_block_incremental) {
917 dest->block_incremental = params->block_incremental;
918 }
919 if (params->has_x_multifd_channels) {
920 dest->x_multifd_channels = params->x_multifd_channels;
921 }
922 if (params->has_x_multifd_page_count) {
923 dest->x_multifd_page_count = params->x_multifd_page_count;
924 }
925 if (params->has_xbzrle_cache_size) {
926 dest->xbzrle_cache_size = params->xbzrle_cache_size;
927 }
928}
929
930static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
931{
932 MigrationState *s = migrate_get_current();
933
934
935
936 if (params->has_compress_level) {
937 s->parameters.compress_level = params->compress_level;
938 }
939
940 if (params->has_compress_threads) {
941 s->parameters.compress_threads = params->compress_threads;
942 }
943
944 if (params->has_decompress_threads) {
945 s->parameters.decompress_threads = params->decompress_threads;
946 }
947
948 if (params->has_cpu_throttle_initial) {
949 s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
950 }
951
952 if (params->has_cpu_throttle_increment) {
953 s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
954 }
955
956 if (params->has_tls_creds) {
957 g_free(s->parameters.tls_creds);
958 assert(params->tls_creds->type == QTYPE_QSTRING);
959 s->parameters.tls_creds = g_strdup(params->tls_creds->u.s);
960 }
961
962 if (params->has_tls_hostname) {
963 g_free(s->parameters.tls_hostname);
964 assert(params->tls_hostname->type == QTYPE_QSTRING);
965 s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
966 }
967
968 if (params->has_max_bandwidth) {
969 s->parameters.max_bandwidth = params->max_bandwidth;
970 if (s->to_dst_file) {
971 qemu_file_set_rate_limit(s->to_dst_file,
972 s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
973 }
974 }
975
976 if (params->has_downtime_limit) {
977 s->parameters.downtime_limit = params->downtime_limit;
978 }
979
980 if (params->has_x_checkpoint_delay) {
981 s->parameters.x_checkpoint_delay = params->x_checkpoint_delay;
982 if (migration_in_colo_state()) {
983 colo_checkpoint_notify(s);
984 }
985 }
986
987 if (params->has_block_incremental) {
988 s->parameters.block_incremental = params->block_incremental;
989 }
990 if (params->has_x_multifd_channels) {
991 s->parameters.x_multifd_channels = params->x_multifd_channels;
992 }
993 if (params->has_x_multifd_page_count) {
994 s->parameters.x_multifd_page_count = params->x_multifd_page_count;
995 }
996 if (params->has_xbzrle_cache_size) {
997 s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
998 xbzrle_cache_resize(params->xbzrle_cache_size, errp);
999 }
1000}
1001
1002void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
1003{
1004 MigrationParameters tmp;
1005
1006
1007 if (params->has_tls_creds
1008 && params->tls_creds->type == QTYPE_QNULL) {
1009 QDECREF(params->tls_creds->u.n);
1010 params->tls_creds->type = QTYPE_QSTRING;
1011 params->tls_creds->u.s = strdup("");
1012 }
1013
1014 if (params->has_tls_hostname
1015 && params->tls_hostname->type == QTYPE_QNULL) {
1016 QDECREF(params->tls_hostname->u.n);
1017 params->tls_hostname->type = QTYPE_QSTRING;
1018 params->tls_hostname->u.s = strdup("");
1019 }
1020
1021 migrate_params_test_apply(params, &tmp);
1022
1023 if (!migrate_params_check(&tmp, errp)) {
1024
1025 return;
1026 }
1027
1028 migrate_params_apply(params, errp);
1029}
1030
1031
1032void qmp_migrate_start_postcopy(Error **errp)
1033{
1034 MigrationState *s = migrate_get_current();
1035
1036 if (!migrate_postcopy()) {
1037 error_setg(errp, "Enable postcopy with migrate_set_capability before"
1038 " the start of migration");
1039 return;
1040 }
1041
1042 if (s->state == MIGRATION_STATUS_NONE) {
1043 error_setg(errp, "Postcopy must be started after migration has been"
1044 " started");
1045 return;
1046 }
1047
1048
1049
1050
1051 atomic_set(&s->start_postcopy, true);
1052}
1053
1054
1055
1056void migrate_set_state(int *state, int old_state, int new_state)
1057{
1058 assert(new_state < MIGRATION_STATUS__MAX);
1059 if (atomic_cmpxchg(state, old_state, new_state) == old_state) {
1060 trace_migrate_set_state(MigrationStatus_str(new_state));
1061 migrate_generate_event(new_state);
1062 }
1063}
1064
1065static MigrationCapabilityStatusList *migrate_cap_add(
1066 MigrationCapabilityStatusList *list,
1067 MigrationCapability index,
1068 bool state)
1069{
1070 MigrationCapabilityStatusList *cap;
1071
1072 cap = g_new0(MigrationCapabilityStatusList, 1);
1073 cap->value = g_new0(MigrationCapabilityStatus, 1);
1074 cap->value->capability = index;
1075 cap->value->state = state;
1076 cap->next = list;
1077
1078 return cap;
1079}
1080
1081void migrate_set_block_enabled(bool value, Error **errp)
1082{
1083 MigrationCapabilityStatusList *cap;
1084
1085 cap = migrate_cap_add(NULL, MIGRATION_CAPABILITY_BLOCK, value);
1086 qmp_migrate_set_capabilities(cap, errp);
1087 qapi_free_MigrationCapabilityStatusList(cap);
1088}
1089
1090static void migrate_set_block_incremental(MigrationState *s, bool value)
1091{
1092 s->parameters.block_incremental = value;
1093}
1094
1095static void block_cleanup_parameters(MigrationState *s)
1096{
1097 if (s->must_remove_block_options) {
1098
1099 migrate_set_block_enabled(false, &error_abort);
1100 migrate_set_block_incremental(s, false);
1101 s->must_remove_block_options = false;
1102 }
1103}
1104
1105static void migrate_fd_cleanup(void *opaque)
1106{
1107 MigrationState *s = opaque;
1108
1109 qemu_bh_delete(s->cleanup_bh);
1110 s->cleanup_bh = NULL;
1111
1112 qemu_savevm_state_cleanup();
1113
1114 if (s->to_dst_file) {
1115 Error *local_err = NULL;
1116
1117 trace_migrate_fd_cleanup();
1118 qemu_mutex_unlock_iothread();
1119 if (s->migration_thread_running) {
1120 qemu_thread_join(&s->thread);
1121 s->migration_thread_running = false;
1122 }
1123 qemu_mutex_lock_iothread();
1124
1125 if (multifd_save_cleanup(&local_err) != 0) {
1126 error_report_err(local_err);
1127 }
1128 qemu_fclose(s->to_dst_file);
1129 s->to_dst_file = NULL;
1130 }
1131
1132 assert((s->state != MIGRATION_STATUS_ACTIVE) &&
1133 (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE));
1134
1135 if (s->state == MIGRATION_STATUS_CANCELLING) {
1136 migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING,
1137 MIGRATION_STATUS_CANCELLED);
1138 }
1139
1140 if (s->error) {
1141
1142 error_report_err(error_copy(s->error));
1143 }
1144 notifier_list_notify(&migration_state_notifiers, s);
1145 block_cleanup_parameters(s);
1146}
1147
1148void migrate_set_error(MigrationState *s, const Error *error)
1149{
1150 qemu_mutex_lock(&s->error_mutex);
1151 if (!s->error) {
1152 s->error = error_copy(error);
1153 }
1154 qemu_mutex_unlock(&s->error_mutex);
1155}
1156
1157void migrate_fd_error(MigrationState *s, const Error *error)
1158{
1159 trace_migrate_fd_error(error_get_pretty(error));
1160 assert(s->to_dst_file == NULL);
1161 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1162 MIGRATION_STATUS_FAILED);
1163 migrate_set_error(s, error);
1164}
1165
1166static void migrate_fd_cancel(MigrationState *s)
1167{
1168 int old_state ;
1169 QEMUFile *f = migrate_get_current()->to_dst_file;
1170 trace_migrate_fd_cancel();
1171
1172 if (s->rp_state.from_dst_file) {
1173
1174 qemu_file_shutdown(s->rp_state.from_dst_file);
1175 }
1176
1177 do {
1178 old_state = s->state;
1179 if (!migration_is_setup_or_active(old_state)) {
1180 break;
1181 }
1182
1183 if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) {
1184 qemu_sem_post(&s->pause_sem);
1185 }
1186 migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING);
1187 } while (s->state != MIGRATION_STATUS_CANCELLING);
1188
1189
1190
1191
1192
1193
1194
1195
1196 if (s->state == MIGRATION_STATUS_CANCELLING && f) {
1197 qemu_file_shutdown(f);
1198 }
1199 if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) {
1200 Error *local_err = NULL;
1201
1202 bdrv_invalidate_cache_all(&local_err);
1203 if (local_err) {
1204 error_report_err(local_err);
1205 } else {
1206 s->block_inactive = false;
1207 }
1208 }
1209}
1210
1211void add_migration_state_change_notifier(Notifier *notify)
1212{
1213 notifier_list_add(&migration_state_notifiers, notify);
1214}
1215
1216void remove_migration_state_change_notifier(Notifier *notify)
1217{
1218 notifier_remove(notify);
1219}
1220
1221bool migration_in_setup(MigrationState *s)
1222{
1223 return s->state == MIGRATION_STATUS_SETUP;
1224}
1225
1226bool migration_has_finished(MigrationState *s)
1227{
1228 return s->state == MIGRATION_STATUS_COMPLETED;
1229}
1230
1231bool migration_has_failed(MigrationState *s)
1232{
1233 return (s->state == MIGRATION_STATUS_CANCELLED ||
1234 s->state == MIGRATION_STATUS_FAILED);
1235}
1236
1237bool migration_in_postcopy(void)
1238{
1239 MigrationState *s = migrate_get_current();
1240
1241 return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
1242}
1243
1244bool migration_in_postcopy_after_devices(MigrationState *s)
1245{
1246 return migration_in_postcopy() && s->postcopy_after_devices;
1247}
1248
1249bool migration_is_idle(void)
1250{
1251 MigrationState *s = migrate_get_current();
1252
1253 switch (s->state) {
1254 case MIGRATION_STATUS_NONE:
1255 case MIGRATION_STATUS_CANCELLED:
1256 case MIGRATION_STATUS_COMPLETED:
1257 case MIGRATION_STATUS_FAILED:
1258 return true;
1259 case MIGRATION_STATUS_SETUP:
1260 case MIGRATION_STATUS_CANCELLING:
1261 case MIGRATION_STATUS_ACTIVE:
1262 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
1263 case MIGRATION_STATUS_COLO:
1264 case MIGRATION_STATUS_PRE_SWITCHOVER:
1265 case MIGRATION_STATUS_DEVICE:
1266 return false;
1267 case MIGRATION_STATUS__MAX:
1268 g_assert_not_reached();
1269 }
1270
1271 return false;
1272}
1273
1274void migrate_init(MigrationState *s)
1275{
1276
1277
1278
1279
1280
1281 s->bytes_xfer = 0;
1282 s->xfer_limit = 0;
1283 s->cleanup_bh = 0;
1284 s->to_dst_file = NULL;
1285 s->state = MIGRATION_STATUS_NONE;
1286 s->rp_state.from_dst_file = NULL;
1287 s->rp_state.error = false;
1288 s->mbps = 0.0;
1289 s->downtime = 0;
1290 s->expected_downtime = 0;
1291 s->setup_time = 0;
1292 s->start_postcopy = false;
1293 s->postcopy_after_devices = false;
1294 s->migration_thread_running = false;
1295 error_free(s->error);
1296 s->error = NULL;
1297
1298 migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
1299
1300 s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
1301 s->total_time = 0;
1302 s->vm_was_running = false;
1303 s->iteration_initial_bytes = 0;
1304 s->threshold_size = 0;
1305}
1306
1307static GSList *migration_blockers;
1308
1309int migrate_add_blocker(Error *reason, Error **errp)
1310{
1311 if (migrate_get_current()->only_migratable) {
1312 error_propagate(errp, error_copy(reason));
1313 error_prepend(errp, "disallowing migration blocker "
1314 "(--only_migratable) for: ");
1315 return -EACCES;
1316 }
1317
1318 if (migration_is_idle()) {
1319 migration_blockers = g_slist_prepend(migration_blockers, reason);
1320 return 0;
1321 }
1322
1323 error_propagate(errp, error_copy(reason));
1324 error_prepend(errp, "disallowing migration blocker (migration in "
1325 "progress) for: ");
1326 return -EBUSY;
1327}
1328
1329void migrate_del_blocker(Error *reason)
1330{
1331 migration_blockers = g_slist_remove(migration_blockers, reason);
1332}
1333
1334void qmp_migrate_incoming(const char *uri, Error **errp)
1335{
1336 Error *local_err = NULL;
1337 static bool once = true;
1338
1339 if (!deferred_incoming) {
1340 error_setg(errp, "For use with '-incoming defer'");
1341 return;
1342 }
1343 if (!once) {
1344 error_setg(errp, "The incoming migration has already been started");
1345 }
1346
1347 qemu_start_incoming_migration(uri, &local_err);
1348
1349 if (local_err) {
1350 error_propagate(errp, local_err);
1351 return;
1352 }
1353
1354 once = false;
1355}
1356
1357bool migration_is_blocked(Error **errp)
1358{
1359 if (qemu_savevm_state_blocked(errp)) {
1360 return true;
1361 }
1362
1363 if (migration_blockers) {
1364 error_propagate(errp, error_copy(migration_blockers->data));
1365 return true;
1366 }
1367
1368 return false;
1369}
1370
1371void qmp_migrate(const char *uri, bool has_blk, bool blk,
1372 bool has_inc, bool inc, bool has_detach, bool detach,
1373 Error **errp)
1374{
1375 Error *local_err = NULL;
1376 MigrationState *s = migrate_get_current();
1377 const char *p;
1378
1379 if (migration_is_setup_or_active(s->state) ||
1380 s->state == MIGRATION_STATUS_CANCELLING ||
1381 s->state == MIGRATION_STATUS_COLO) {
1382 error_setg(errp, QERR_MIGRATION_ACTIVE);
1383 return;
1384 }
1385 if (runstate_check(RUN_STATE_INMIGRATE)) {
1386 error_setg(errp, "Guest is waiting for an incoming migration");
1387 return;
1388 }
1389
1390 if (migration_is_blocked(errp)) {
1391 return;
1392 }
1393
1394 if ((has_blk && blk) || (has_inc && inc)) {
1395 if (migrate_use_block() || migrate_use_block_incremental()) {
1396 error_setg(errp, "Command options are incompatible with "
1397 "current migration capabilities");
1398 return;
1399 }
1400 migrate_set_block_enabled(true, &local_err);
1401 if (local_err) {
1402 error_propagate(errp, local_err);
1403 return;
1404 }
1405 s->must_remove_block_options = true;
1406 }
1407
1408 if (has_inc && inc) {
1409 migrate_set_block_incremental(s, true);
1410 }
1411
1412 migrate_init(s);
1413
1414 if (strstart(uri, "tcp:", &p)) {
1415 tcp_start_outgoing_migration(s, p, &local_err);
1416#ifdef CONFIG_RDMA
1417 } else if (strstart(uri, "rdma:", &p)) {
1418 rdma_start_outgoing_migration(s, p, &local_err);
1419#endif
1420 } else if (strstart(uri, "exec:", &p)) {
1421 exec_start_outgoing_migration(s, p, &local_err);
1422 } else if (strstart(uri, "unix:", &p)) {
1423 unix_start_outgoing_migration(s, p, &local_err);
1424 } else if (strstart(uri, "fd:", &p)) {
1425 fd_start_outgoing_migration(s, p, &local_err);
1426 } else {
1427 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
1428 "a valid migration protocol");
1429 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1430 MIGRATION_STATUS_FAILED);
1431 block_cleanup_parameters(s);
1432 return;
1433 }
1434
1435 if (local_err) {
1436 migrate_fd_error(s, local_err);
1437 error_propagate(errp, local_err);
1438 return;
1439 }
1440}
1441
1442void qmp_migrate_cancel(Error **errp)
1443{
1444 migrate_fd_cancel(migrate_get_current());
1445}
1446
1447void qmp_migrate_continue(MigrationStatus state, Error **errp)
1448{
1449 MigrationState *s = migrate_get_current();
1450 if (s->state != state) {
1451 error_setg(errp, "Migration not in expected state: %s",
1452 MigrationStatus_str(s->state));
1453 return;
1454 }
1455 qemu_sem_post(&s->pause_sem);
1456}
1457
1458void qmp_migrate_set_cache_size(int64_t value, Error **errp)
1459{
1460 MigrateSetParameters p = {
1461 .has_xbzrle_cache_size = true,
1462 .xbzrle_cache_size = value,
1463 };
1464
1465 qmp_migrate_set_parameters(&p, errp);
1466}
1467
1468int64_t qmp_query_migrate_cache_size(Error **errp)
1469{
1470 return migrate_xbzrle_cache_size();
1471}
1472
1473void qmp_migrate_set_speed(int64_t value, Error **errp)
1474{
1475 MigrateSetParameters p = {
1476 .has_max_bandwidth = true,
1477 .max_bandwidth = value,
1478 };
1479
1480 qmp_migrate_set_parameters(&p, errp);
1481}
1482
1483void qmp_migrate_set_downtime(double value, Error **errp)
1484{
1485 if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) {
1486 error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
1487 "the range of 0 to %d seconds",
1488 MAX_MIGRATE_DOWNTIME_SECONDS);
1489 return;
1490 }
1491
1492 value *= 1000;
1493 value = MAX(0, MIN(INT64_MAX, value));
1494
1495 MigrateSetParameters p = {
1496 .has_downtime_limit = true,
1497 .downtime_limit = value,
1498 };
1499
1500 qmp_migrate_set_parameters(&p, errp);
1501}
1502
1503bool migrate_release_ram(void)
1504{
1505 MigrationState *s;
1506
1507 s = migrate_get_current();
1508
1509 return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM];
1510}
1511
1512bool migrate_postcopy_ram(void)
1513{
1514 MigrationState *s;
1515
1516 s = migrate_get_current();
1517
1518 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
1519}
1520
1521bool migrate_postcopy(void)
1522{
1523 return migrate_postcopy_ram() || migrate_dirty_bitmaps();
1524}
1525
1526bool migrate_auto_converge(void)
1527{
1528 MigrationState *s;
1529
1530 s = migrate_get_current();
1531
1532 return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
1533}
1534
1535bool migrate_zero_blocks(void)
1536{
1537 MigrationState *s;
1538
1539 s = migrate_get_current();
1540
1541 return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
1542}
1543
1544bool migrate_use_compression(void)
1545{
1546 MigrationState *s;
1547
1548 s = migrate_get_current();
1549
1550 return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
1551}
1552
1553int migrate_compress_level(void)
1554{
1555 MigrationState *s;
1556
1557 s = migrate_get_current();
1558
1559 return s->parameters.compress_level;
1560}
1561
1562int migrate_compress_threads(void)
1563{
1564 MigrationState *s;
1565
1566 s = migrate_get_current();
1567
1568 return s->parameters.compress_threads;
1569}
1570
1571int migrate_decompress_threads(void)
1572{
1573 MigrationState *s;
1574
1575 s = migrate_get_current();
1576
1577 return s->parameters.decompress_threads;
1578}
1579
1580bool migrate_dirty_bitmaps(void)
1581{
1582 MigrationState *s;
1583
1584 s = migrate_get_current();
1585
1586 return s->enabled_capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS];
1587}
1588
1589bool migrate_use_events(void)
1590{
1591 MigrationState *s;
1592
1593 s = migrate_get_current();
1594
1595 return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
1596}
1597
1598bool migrate_use_multifd(void)
1599{
1600 MigrationState *s;
1601
1602 s = migrate_get_current();
1603
1604 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_MULTIFD];
1605}
1606
1607bool migrate_pause_before_switchover(void)
1608{
1609 MigrationState *s;
1610
1611 s = migrate_get_current();
1612
1613 return s->enabled_capabilities[
1614 MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
1615}
1616
1617int migrate_multifd_channels(void)
1618{
1619 MigrationState *s;
1620
1621 s = migrate_get_current();
1622
1623 return s->parameters.x_multifd_channels;
1624}
1625
1626int migrate_multifd_page_count(void)
1627{
1628 MigrationState *s;
1629
1630 s = migrate_get_current();
1631
1632 return s->parameters.x_multifd_page_count;
1633}
1634
1635int migrate_use_xbzrle(void)
1636{
1637 MigrationState *s;
1638
1639 s = migrate_get_current();
1640
1641 return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
1642}
1643
1644int64_t migrate_xbzrle_cache_size(void)
1645{
1646 MigrationState *s;
1647
1648 s = migrate_get_current();
1649
1650 return s->parameters.xbzrle_cache_size;
1651}
1652
1653bool migrate_use_block(void)
1654{
1655 MigrationState *s;
1656
1657 s = migrate_get_current();
1658
1659 return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK];
1660}
1661
1662bool migrate_use_return_path(void)
1663{
1664 MigrationState *s;
1665
1666 s = migrate_get_current();
1667
1668 return s->enabled_capabilities[MIGRATION_CAPABILITY_RETURN_PATH];
1669}
1670
1671bool migrate_use_block_incremental(void)
1672{
1673 MigrationState *s;
1674
1675 s = migrate_get_current();
1676
1677 return s->parameters.block_incremental;
1678}
1679
1680
1681
1682
1683
1684
1685static void mark_source_rp_bad(MigrationState *s)
1686{
1687 s->rp_state.error = true;
1688}
1689
1690static struct rp_cmd_args {
1691 ssize_t len;
1692 const char *name;
1693} rp_cmd_args[] = {
1694 [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" },
1695 [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" },
1696 [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" },
1697 [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" },
1698 [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" },
1699 [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" },
1700};
1701
1702
1703
1704
1705
1706
1707static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname,
1708 ram_addr_t start, size_t len)
1709{
1710 long our_host_ps = getpagesize();
1711
1712 trace_migrate_handle_rp_req_pages(rbname, start, len);
1713
1714
1715
1716
1717
1718 if (start & (our_host_ps-1) ||
1719 (len & (our_host_ps-1))) {
1720 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
1721 " len: %zd", __func__, start, len);
1722 mark_source_rp_bad(ms);
1723 return;
1724 }
1725
1726 if (ram_save_queue_pages(rbname, start, len)) {
1727 mark_source_rp_bad(ms);
1728 }
1729}
1730
1731
1732
1733
1734
1735static void *source_return_path_thread(void *opaque)
1736{
1737 MigrationState *ms = opaque;
1738 QEMUFile *rp = ms->rp_state.from_dst_file;
1739 uint16_t header_len, header_type;
1740 uint8_t buf[512];
1741 uint32_t tmp32, sibling_error;
1742 ram_addr_t start = 0;
1743 size_t len = 0, expected_len;
1744 int res;
1745
1746 trace_source_return_path_thread_entry();
1747 while (!ms->rp_state.error && !qemu_file_get_error(rp) &&
1748 migration_is_setup_or_active(ms->state)) {
1749 trace_source_return_path_thread_loop_top();
1750 header_type = qemu_get_be16(rp);
1751 header_len = qemu_get_be16(rp);
1752
1753 if (qemu_file_get_error(rp)) {
1754 mark_source_rp_bad(ms);
1755 goto out;
1756 }
1757
1758 if (header_type >= MIG_RP_MSG_MAX ||
1759 header_type == MIG_RP_MSG_INVALID) {
1760 error_report("RP: Received invalid message 0x%04x length 0x%04x",
1761 header_type, header_len);
1762 mark_source_rp_bad(ms);
1763 goto out;
1764 }
1765
1766 if ((rp_cmd_args[header_type].len != -1 &&
1767 header_len != rp_cmd_args[header_type].len) ||
1768 header_len > sizeof(buf)) {
1769 error_report("RP: Received '%s' message (0x%04x) with"
1770 "incorrect length %d expecting %zu",
1771 rp_cmd_args[header_type].name, header_type, header_len,
1772 (size_t)rp_cmd_args[header_type].len);
1773 mark_source_rp_bad(ms);
1774 goto out;
1775 }
1776
1777
1778 res = qemu_get_buffer(rp, buf, header_len);
1779 if (res != header_len) {
1780 error_report("RP: Failed reading data for message 0x%04x"
1781 " read %d expected %d",
1782 header_type, res, header_len);
1783 mark_source_rp_bad(ms);
1784 goto out;
1785 }
1786
1787
1788 switch (header_type) {
1789 case MIG_RP_MSG_SHUT:
1790 sibling_error = ldl_be_p(buf);
1791 trace_source_return_path_thread_shut(sibling_error);
1792 if (sibling_error) {
1793 error_report("RP: Sibling indicated error %d", sibling_error);
1794 mark_source_rp_bad(ms);
1795 }
1796
1797
1798
1799
1800
1801 goto out;
1802
1803 case MIG_RP_MSG_PONG:
1804 tmp32 = ldl_be_p(buf);
1805 trace_source_return_path_thread_pong(tmp32);
1806 break;
1807
1808 case MIG_RP_MSG_REQ_PAGES:
1809 start = ldq_be_p(buf);
1810 len = ldl_be_p(buf + 8);
1811 migrate_handle_rp_req_pages(ms, NULL, start, len);
1812 break;
1813
1814 case MIG_RP_MSG_REQ_PAGES_ID:
1815 expected_len = 12 + 1;
1816
1817 if (header_len >= expected_len) {
1818 start = ldq_be_p(buf);
1819 len = ldl_be_p(buf + 8);
1820
1821 tmp32 = buf[12];
1822 buf[13 + tmp32] = '\0';
1823 expected_len += tmp32;
1824 }
1825 if (header_len != expected_len) {
1826 error_report("RP: Req_Page_id with length %d expecting %zd",
1827 header_len, expected_len);
1828 mark_source_rp_bad(ms);
1829 goto out;
1830 }
1831 migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len);
1832 break;
1833
1834 default:
1835 break;
1836 }
1837 }
1838 if (qemu_file_get_error(rp)) {
1839 trace_source_return_path_thread_bad_end();
1840 mark_source_rp_bad(ms);
1841 }
1842
1843 trace_source_return_path_thread_end();
1844out:
1845 ms->rp_state.from_dst_file = NULL;
1846 qemu_fclose(rp);
1847 return NULL;
1848}
1849
1850static int open_return_path_on_source(MigrationState *ms)
1851{
1852
1853 ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file);
1854 if (!ms->rp_state.from_dst_file) {
1855 return -1;
1856 }
1857
1858 trace_open_return_path_on_source();
1859 qemu_thread_create(&ms->rp_state.rp_thread, "return path",
1860 source_return_path_thread, ms, QEMU_THREAD_JOINABLE);
1861
1862 trace_open_return_path_on_source_continue();
1863
1864 return 0;
1865}
1866
1867
1868static int await_return_path_close_on_source(MigrationState *ms)
1869{
1870
1871
1872
1873
1874
1875 if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) {
1876
1877
1878
1879
1880 qemu_file_shutdown(ms->rp_state.from_dst_file);
1881 mark_source_rp_bad(ms);
1882 }
1883 trace_await_return_path_close_on_source_joining();
1884 qemu_thread_join(&ms->rp_state.rp_thread);
1885 trace_await_return_path_close_on_source_close();
1886 return ms->rp_state.error;
1887}
1888
1889
1890
1891
1892
1893static int postcopy_start(MigrationState *ms)
1894{
1895 int ret;
1896 QIOChannelBuffer *bioc;
1897 QEMUFile *fb;
1898 int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
1899 bool restart_block = false;
1900 int cur_state = MIGRATION_STATUS_ACTIVE;
1901 if (!migrate_pause_before_switchover()) {
1902 migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
1903 MIGRATION_STATUS_POSTCOPY_ACTIVE);
1904 }
1905
1906 trace_postcopy_start();
1907 qemu_mutex_lock_iothread();
1908 trace_postcopy_start_set_run();
1909
1910 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
1911 global_state_store();
1912 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
1913 if (ret < 0) {
1914 goto fail;
1915 }
1916
1917 ret = migration_maybe_pause(ms, &cur_state,
1918 MIGRATION_STATUS_POSTCOPY_ACTIVE);
1919 if (ret < 0) {
1920 goto fail;
1921 }
1922
1923 ret = bdrv_inactivate_all();
1924 if (ret < 0) {
1925 goto fail;
1926 }
1927 restart_block = true;
1928
1929
1930
1931
1932
1933 qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false);
1934
1935
1936
1937
1938
1939
1940
1941 if (migrate_postcopy_ram()) {
1942 if (ram_postcopy_send_discard_bitmap(ms)) {
1943 error_report("postcopy send discard bitmap failed");
1944 goto fail;
1945 }
1946 }
1947
1948
1949
1950
1951
1952
1953 qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
1954 if (migrate_postcopy_ram()) {
1955
1956 qemu_savevm_send_ping(ms->to_dst_file, 2);
1957 }
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970 bioc = qio_channel_buffer_new(4096);
1971 qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer");
1972 fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
1973 object_unref(OBJECT(bioc));
1974
1975
1976
1977
1978
1979 qemu_savevm_send_postcopy_listen(fb);
1980
1981 qemu_savevm_state_complete_precopy(fb, false, false);
1982 if (migrate_postcopy_ram()) {
1983 qemu_savevm_send_ping(fb, 3);
1984 }
1985
1986 qemu_savevm_send_postcopy_run(fb);
1987
1988
1989
1990
1991
1992
1993
1994 ret = qemu_file_get_error(ms->to_dst_file);
1995 if (ret) {
1996 error_report("postcopy_start: Migration stream errored (pre package)");
1997 goto fail_closefb;
1998 }
1999
2000 restart_block = false;
2001
2002
2003 if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) {
2004 goto fail_closefb;
2005 }
2006 qemu_fclose(fb);
2007
2008
2009
2010
2011
2012 ms->postcopy_after_devices = true;
2013 notifier_list_notify(&migration_state_notifiers, ms);
2014
2015 ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop;
2016
2017 qemu_mutex_unlock_iothread();
2018
2019 if (migrate_postcopy_ram()) {
2020
2021
2022
2023
2024 qemu_savevm_send_ping(ms->to_dst_file, 4);
2025 }
2026
2027 if (migrate_release_ram()) {
2028 ram_postcopy_migrated_memory_release(ms);
2029 }
2030
2031 ret = qemu_file_get_error(ms->to_dst_file);
2032 if (ret) {
2033 error_report("postcopy_start: Migration stream errored");
2034 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
2035 MIGRATION_STATUS_FAILED);
2036 }
2037
2038 return ret;
2039
2040fail_closefb:
2041 qemu_fclose(fb);
2042fail:
2043 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
2044 MIGRATION_STATUS_FAILED);
2045 if (restart_block) {
2046
2047
2048
2049 Error *local_err = NULL;
2050
2051 bdrv_invalidate_cache_all(&local_err);
2052 if (local_err) {
2053 error_report_err(local_err);
2054 }
2055 }
2056 qemu_mutex_unlock_iothread();
2057 return -1;
2058}
2059
2060
2061
2062
2063
2064
2065static int migration_maybe_pause(MigrationState *s,
2066 int *current_active_state,
2067 int new_state)
2068{
2069 if (!migrate_pause_before_switchover()) {
2070 return 0;
2071 }
2072
2073
2074
2075
2076
2077
2078
2079 while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) {
2080
2081 }
2082
2083 qemu_mutex_unlock_iothread();
2084 migrate_set_state(&s->state, *current_active_state,
2085 MIGRATION_STATUS_PRE_SWITCHOVER);
2086 qemu_sem_wait(&s->pause_sem);
2087 migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
2088 new_state);
2089 *current_active_state = new_state;
2090 qemu_mutex_lock_iothread();
2091
2092 return s->state == new_state ? 0 : -EINVAL;
2093}
2094
2095
2096
2097
2098
2099
2100
2101static void migration_completion(MigrationState *s)
2102{
2103 int ret;
2104 int current_active_state = s->state;
2105
2106 if (s->state == MIGRATION_STATUS_ACTIVE) {
2107 qemu_mutex_lock_iothread();
2108 s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2109 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
2110 s->vm_was_running = runstate_is_running();
2111 ret = global_state_store();
2112
2113 if (!ret) {
2114 bool inactivate = !migrate_colo_enabled();
2115 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
2116 if (ret >= 0) {
2117 ret = migration_maybe_pause(s, ¤t_active_state,
2118 MIGRATION_STATUS_DEVICE);
2119 }
2120 if (ret >= 0) {
2121 qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
2122 ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
2123 inactivate);
2124 }
2125 if (inactivate && ret >= 0) {
2126 s->block_inactive = true;
2127 }
2128 }
2129 qemu_mutex_unlock_iothread();
2130
2131 if (ret < 0) {
2132 goto fail;
2133 }
2134 } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
2135 trace_migration_completion_postcopy_end();
2136
2137 qemu_savevm_state_complete_postcopy(s->to_dst_file);
2138 trace_migration_completion_postcopy_end_after_complete();
2139 }
2140
2141
2142
2143
2144
2145
2146
2147 if (s->rp_state.from_dst_file) {
2148 int rp_error;
2149 trace_migration_return_path_end_before();
2150 rp_error = await_return_path_close_on_source(s);
2151 trace_migration_return_path_end_after(rp_error);
2152 if (rp_error) {
2153 goto fail_invalidate;
2154 }
2155 }
2156
2157 if (qemu_file_get_error(s->to_dst_file)) {
2158 trace_migration_completion_file_err();
2159 goto fail_invalidate;
2160 }
2161
2162 if (!migrate_colo_enabled()) {
2163 migrate_set_state(&s->state, current_active_state,
2164 MIGRATION_STATUS_COMPLETED);
2165 }
2166
2167 return;
2168
2169fail_invalidate:
2170
2171
2172
2173 if (s->state == MIGRATION_STATUS_ACTIVE ||
2174 s->state == MIGRATION_STATUS_DEVICE) {
2175 Error *local_err = NULL;
2176
2177 qemu_mutex_lock_iothread();
2178 bdrv_invalidate_cache_all(&local_err);
2179 if (local_err) {
2180 error_report_err(local_err);
2181 } else {
2182 s->block_inactive = false;
2183 }
2184 qemu_mutex_unlock_iothread();
2185 }
2186
2187fail:
2188 migrate_set_state(&s->state, current_active_state,
2189 MIGRATION_STATUS_FAILED);
2190}
2191
2192bool migrate_colo_enabled(void)
2193{
2194 MigrationState *s = migrate_get_current();
2195 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO];
2196}
2197
2198static void migration_calculate_complete(MigrationState *s)
2199{
2200 uint64_t bytes = qemu_ftell(s->to_dst_file);
2201 int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2202
2203 s->total_time = end_time - s->start_time;
2204 if (!s->downtime) {
2205
2206
2207
2208
2209 s->downtime = end_time - s->downtime_start;
2210 }
2211
2212 if (s->total_time) {
2213 s->mbps = ((double) bytes * 8.0) / s->total_time / 1000;
2214 }
2215}
2216
2217static void migration_update_counters(MigrationState *s,
2218 int64_t current_time)
2219{
2220 uint64_t transferred, time_spent;
2221 double bandwidth;
2222
2223 if (current_time < s->iteration_start_time + BUFFER_DELAY) {
2224 return;
2225 }
2226
2227 transferred = qemu_ftell(s->to_dst_file) - s->iteration_initial_bytes;
2228 time_spent = current_time - s->iteration_start_time;
2229 bandwidth = (double)transferred / time_spent;
2230 s->threshold_size = bandwidth * s->parameters.downtime_limit;
2231
2232 s->mbps = (((double) transferred * 8.0) /
2233 ((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
2234
2235
2236
2237
2238
2239 if (ram_counters.dirty_pages_rate && transferred > 10000) {
2240 s->expected_downtime = ram_counters.dirty_pages_rate *
2241 qemu_target_page_size() / bandwidth;
2242 }
2243
2244 qemu_file_reset_rate_limit(s->to_dst_file);
2245
2246 s->iteration_start_time = current_time;
2247 s->iteration_initial_bytes = qemu_ftell(s->to_dst_file);
2248
2249 trace_migrate_transferred(transferred, time_spent,
2250 bandwidth, s->threshold_size);
2251}
2252
2253
2254typedef enum {
2255 MIG_ITERATE_RESUME,
2256 MIG_ITERATE_SKIP,
2257 MIG_ITERATE_BREAK,
2258} MigIterateState;
2259
2260
2261
2262
2263
2264static MigIterateState migration_iteration_run(MigrationState *s)
2265{
2266 uint64_t pending_size, pend_pre, pend_compat, pend_post;
2267 bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE;
2268
2269 qemu_savevm_state_pending(s->to_dst_file, s->threshold_size, &pend_pre,
2270 &pend_compat, &pend_post);
2271 pending_size = pend_pre + pend_compat + pend_post;
2272
2273 trace_migrate_pending(pending_size, s->threshold_size,
2274 pend_pre, pend_compat, pend_post);
2275
2276 if (pending_size && pending_size >= s->threshold_size) {
2277
2278 if (migrate_postcopy() && !in_postcopy &&
2279 pend_pre <= s->threshold_size &&
2280 atomic_read(&s->start_postcopy)) {
2281 if (postcopy_start(s)) {
2282 error_report("%s: postcopy failed to start", __func__);
2283 }
2284 return MIG_ITERATE_SKIP;
2285 }
2286
2287 qemu_savevm_state_iterate(s->to_dst_file,
2288 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
2289 } else {
2290 trace_migration_thread_low_pending(pending_size);
2291 migration_completion(s);
2292 return MIG_ITERATE_BREAK;
2293 }
2294
2295 return MIG_ITERATE_RESUME;
2296}
2297
2298static void migration_iteration_finish(MigrationState *s)
2299{
2300
2301 cpu_throttle_stop();
2302
2303 qemu_mutex_lock_iothread();
2304 switch (s->state) {
2305 case MIGRATION_STATUS_COMPLETED:
2306 migration_calculate_complete(s);
2307 runstate_set(RUN_STATE_POSTMIGRATE);
2308 break;
2309
2310 case MIGRATION_STATUS_ACTIVE:
2311
2312
2313
2314
2315 if (!migrate_colo_enabled()) {
2316 error_report("%s: critical error: calling COLO code without "
2317 "COLO enabled", __func__);
2318 }
2319 migrate_start_colo_process(s);
2320
2321
2322
2323
2324 s->vm_was_running = true;
2325
2326 case MIGRATION_STATUS_FAILED:
2327 case MIGRATION_STATUS_CANCELLED:
2328 if (s->vm_was_running) {
2329 vm_start();
2330 } else {
2331 if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
2332 runstate_set(RUN_STATE_POSTMIGRATE);
2333 }
2334 }
2335 break;
2336
2337 default:
2338
2339 error_report("%s: Unknown ending state %d", __func__, s->state);
2340 break;
2341 }
2342 qemu_bh_schedule(s->cleanup_bh);
2343 qemu_mutex_unlock_iothread();
2344}
2345
2346
2347
2348
2349
2350static void *migration_thread(void *opaque)
2351{
2352 MigrationState *s = opaque;
2353 int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
2354
2355 rcu_register_thread();
2356
2357 s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2358
2359 qemu_savevm_state_header(s->to_dst_file);
2360
2361
2362
2363
2364
2365 if (s->rp_state.from_dst_file) {
2366
2367 qemu_savevm_send_open_return_path(s->to_dst_file);
2368
2369
2370 qemu_savevm_send_ping(s->to_dst_file, 1);
2371 }
2372
2373 if (migrate_postcopy()) {
2374
2375
2376
2377
2378
2379 qemu_savevm_send_postcopy_advise(s->to_dst_file);
2380 }
2381
2382 qemu_savevm_state_setup(s->to_dst_file);
2383
2384 s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
2385 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
2386 MIGRATION_STATUS_ACTIVE);
2387
2388 trace_migration_thread_setup_complete();
2389
2390 while (s->state == MIGRATION_STATUS_ACTIVE ||
2391 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
2392 int64_t current_time;
2393
2394 if (!qemu_file_rate_limit(s->to_dst_file)) {
2395 MigIterateState iter_state = migration_iteration_run(s);
2396 if (iter_state == MIG_ITERATE_SKIP) {
2397 continue;
2398 } else if (iter_state == MIG_ITERATE_BREAK) {
2399 break;
2400 }
2401 }
2402
2403 if (qemu_file_get_error(s->to_dst_file)) {
2404 if (migration_is_setup_or_active(s->state)) {
2405 migrate_set_state(&s->state, s->state,
2406 MIGRATION_STATUS_FAILED);
2407 }
2408 trace_migration_thread_file_err();
2409 break;
2410 }
2411
2412 current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2413
2414 migration_update_counters(s, current_time);
2415
2416 if (qemu_file_rate_limit(s->to_dst_file)) {
2417
2418 g_usleep((s->iteration_start_time + BUFFER_DELAY -
2419 current_time) * 1000);
2420 }
2421 }
2422
2423 trace_migration_thread_after_loop();
2424 migration_iteration_finish(s);
2425 rcu_unregister_thread();
2426 return NULL;
2427}
2428
2429void migrate_fd_connect(MigrationState *s, Error *error_in)
2430{
2431 s->expected_downtime = s->parameters.downtime_limit;
2432 s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
2433 if (error_in) {
2434 migrate_fd_error(s, error_in);
2435 migrate_fd_cleanup(s);
2436 return;
2437 }
2438
2439 qemu_file_set_blocking(s->to_dst_file, true);
2440 qemu_file_set_rate_limit(s->to_dst_file,
2441 s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
2442
2443
2444 notifier_list_notify(&migration_state_notifiers, s);
2445
2446
2447
2448
2449
2450
2451 if (migrate_postcopy_ram() || migrate_use_return_path()) {
2452 if (open_return_path_on_source(s)) {
2453 error_report("Unable to open return-path for postcopy");
2454 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
2455 MIGRATION_STATUS_FAILED);
2456 migrate_fd_cleanup(s);
2457 return;
2458 }
2459 }
2460
2461 if (multifd_save_setup() != 0) {
2462 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
2463 MIGRATION_STATUS_FAILED);
2464 migrate_fd_cleanup(s);
2465 return;
2466 }
2467 qemu_thread_create(&s->thread, "live_migration", migration_thread, s,
2468 QEMU_THREAD_JOINABLE);
2469 s->migration_thread_running = true;
2470}
2471
2472void migration_global_dump(Monitor *mon)
2473{
2474 MigrationState *ms = migrate_get_current();
2475
2476 monitor_printf(mon, "globals:\n");
2477 monitor_printf(mon, "store-global-state: %s\n",
2478 ms->store_global_state ? "on" : "off");
2479 monitor_printf(mon, "only-migratable: %s\n",
2480 ms->only_migratable ? "on" : "off");
2481 monitor_printf(mon, "send-configuration: %s\n",
2482 ms->send_configuration ? "on" : "off");
2483 monitor_printf(mon, "send-section-footer: %s\n",
2484 ms->send_section_footer ? "on" : "off");
2485}
2486
2487#define DEFINE_PROP_MIG_CAP(name, x) \
2488 DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false)
2489
2490static Property migration_properties[] = {
2491 DEFINE_PROP_BOOL("store-global-state", MigrationState,
2492 store_global_state, true),
2493 DEFINE_PROP_BOOL("only-migratable", MigrationState, only_migratable, false),
2494 DEFINE_PROP_BOOL("send-configuration", MigrationState,
2495 send_configuration, true),
2496 DEFINE_PROP_BOOL("send-section-footer", MigrationState,
2497 send_section_footer, true),
2498
2499
2500 DEFINE_PROP_UINT8("x-compress-level", MigrationState,
2501 parameters.compress_level,
2502 DEFAULT_MIGRATE_COMPRESS_LEVEL),
2503 DEFINE_PROP_UINT8("x-compress-threads", MigrationState,
2504 parameters.compress_threads,
2505 DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
2506 DEFINE_PROP_UINT8("x-decompress-threads", MigrationState,
2507 parameters.decompress_threads,
2508 DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
2509 DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState,
2510 parameters.cpu_throttle_initial,
2511 DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
2512 DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
2513 parameters.cpu_throttle_increment,
2514 DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
2515 DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
2516 parameters.max_bandwidth, MAX_THROTTLE),
2517 DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
2518 parameters.downtime_limit,
2519 DEFAULT_MIGRATE_SET_DOWNTIME),
2520 DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
2521 parameters.x_checkpoint_delay,
2522 DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
2523 DEFINE_PROP_UINT8("x-multifd-channels", MigrationState,
2524 parameters.x_multifd_channels,
2525 DEFAULT_MIGRATE_MULTIFD_CHANNELS),
2526 DEFINE_PROP_UINT32("x-multifd-page-count", MigrationState,
2527 parameters.x_multifd_page_count,
2528 DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT),
2529 DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
2530 parameters.xbzrle_cache_size,
2531 DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
2532
2533
2534 DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
2535 DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
2536 DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
2537 DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
2538 DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
2539 DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
2540 DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
2541 DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
2542 DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
2543 DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
2544 DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
2545 DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_X_MULTIFD),
2546
2547 DEFINE_PROP_END_OF_LIST(),
2548};
2549
2550static void migration_class_init(ObjectClass *klass, void *data)
2551{
2552 DeviceClass *dc = DEVICE_CLASS(klass);
2553
2554 dc->user_creatable = false;
2555 dc->props = migration_properties;
2556}
2557
2558static void migration_instance_finalize(Object *obj)
2559{
2560 MigrationState *ms = MIGRATION_OBJ(obj);
2561 MigrationParameters *params = &ms->parameters;
2562
2563 qemu_mutex_destroy(&ms->error_mutex);
2564 g_free(params->tls_hostname);
2565 g_free(params->tls_creds);
2566 qemu_sem_destroy(&ms->pause_sem);
2567 error_free(ms->error);
2568}
2569
2570static void migration_instance_init(Object *obj)
2571{
2572 MigrationState *ms = MIGRATION_OBJ(obj);
2573 MigrationParameters *params = &ms->parameters;
2574
2575 ms->state = MIGRATION_STATUS_NONE;
2576 ms->mbps = -1;
2577 qemu_sem_init(&ms->pause_sem, 0);
2578 qemu_mutex_init(&ms->error_mutex);
2579
2580 params->tls_hostname = g_strdup("");
2581 params->tls_creds = g_strdup("");
2582
2583
2584 params->has_compress_level = true;
2585 params->has_compress_threads = true;
2586 params->has_decompress_threads = true;
2587 params->has_cpu_throttle_initial = true;
2588 params->has_cpu_throttle_increment = true;
2589 params->has_max_bandwidth = true;
2590 params->has_downtime_limit = true;
2591 params->has_x_checkpoint_delay = true;
2592 params->has_block_incremental = true;
2593 params->has_x_multifd_channels = true;
2594 params->has_x_multifd_page_count = true;
2595 params->has_xbzrle_cache_size = true;
2596}
2597
2598
2599
2600
2601
2602static bool migration_object_check(MigrationState *ms, Error **errp)
2603{
2604 MigrationCapabilityStatusList *head = NULL;
2605
2606 bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret;
2607 int i;
2608
2609 if (!migrate_params_check(&ms->parameters, errp)) {
2610 return false;
2611 }
2612
2613 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
2614 if (ms->enabled_capabilities[i]) {
2615 head = migrate_cap_add(head, i, true);
2616 }
2617 }
2618
2619 ret = migrate_caps_check(cap_list, head, errp);
2620
2621
2622 qapi_free_MigrationCapabilityStatusList(head);
2623
2624 return ret;
2625}
2626
2627static const TypeInfo migration_type = {
2628 .name = TYPE_MIGRATION,
2629
2630
2631
2632
2633
2634
2635
2636
2637 .parent = TYPE_DEVICE,
2638 .class_init = migration_class_init,
2639 .class_size = sizeof(MigrationClass),
2640 .instance_size = sizeof(MigrationState),
2641 .instance_init = migration_instance_init,
2642 .instance_finalize = migration_instance_finalize,
2643};
2644
2645static void register_migration_types(void)
2646{
2647 type_register_static(&migration_type);
2648}
2649
2650type_init(register_migration_types);
2651