1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16#include "qemu/osdep.h"
17#include "qemu/cutils.h"
18#include "qemu/error-report.h"
19#include "migration/blocker.h"
20#include "exec.h"
21#include "fd.h"
22#include "socket.h"
23#include "rdma.h"
24#include "ram.h"
25#include "migration/global_state.h"
26#include "migration/misc.h"
27#include "migration.h"
28#include "savevm.h"
29#include "qemu-file-channel.h"
30#include "qemu-file.h"
31#include "migration/vmstate.h"
32#include "block/block.h"
33#include "qapi/error.h"
34#include "qapi/clone-visitor.h"
35#include "qapi/qapi-visit-sockets.h"
36#include "qapi/qapi-commands-migration.h"
37#include "qapi/qapi-events-migration.h"
38#include "qapi/qmp/qerror.h"
39#include "qapi/qmp/qnull.h"
40#include "qemu/rcu.h"
41#include "block.h"
42#include "postcopy-ram.h"
43#include "qemu/thread.h"
44#include "trace.h"
45#include "exec/target_page.h"
46#include "io/channel-buffer.h"
47#include "migration/colo.h"
48#include "hw/boards.h"
49#include "monitor/monitor.h"
50#include "net/announce.h"
51
52#define MAX_THROTTLE (32 << 20)
53
54
55
56#define BUFFER_DELAY 100
57#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
58
59
60
61#define DEFAULT_MIGRATE_SET_DOWNTIME 300
62
63
64#define MAX_MIGRATE_DOWNTIME_SECONDS 2000
65#define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
66
67
68#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
69
70
71#define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
72
73#define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
74
75#define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
76#define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
77#define DEFAULT_MIGRATE_MAX_CPU_THROTTLE 99
78
79
80#define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024)
81
82
83#define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100)
84#define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
85
86
87
88
89#define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0
90
91
92
93
94
95#define DEFAULT_MIGRATE_ANNOUNCE_INITIAL 50
96#define DEFAULT_MIGRATE_ANNOUNCE_MAX 550
97#define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS 5
98#define DEFAULT_MIGRATE_ANNOUNCE_STEP 100
99
100static NotifierList migration_state_notifiers =
101 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
102
103static bool deferred_incoming;
104
105
106enum mig_rp_message_type {
107 MIG_RP_MSG_INVALID = 0,
108 MIG_RP_MSG_SHUT,
109 MIG_RP_MSG_PONG,
110
111 MIG_RP_MSG_REQ_PAGES_ID,
112 MIG_RP_MSG_REQ_PAGES,
113 MIG_RP_MSG_RECV_BITMAP,
114 MIG_RP_MSG_RESUME_ACK,
115
116 MIG_RP_MSG_MAX
117};
118
119
120
121
122
123static MigrationState *current_migration;
124static MigrationIncomingState *current_incoming;
125
126static bool migration_object_check(MigrationState *ms, Error **errp);
127static int migration_maybe_pause(MigrationState *s,
128 int *current_active_state,
129 int new_state);
130static void migrate_fd_cancel(MigrationState *s);
131
132void migration_object_init(void)
133{
134 MachineState *ms = MACHINE(qdev_get_machine());
135 Error *err = NULL;
136
137
138 assert(!current_migration);
139 current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION));
140
141
142
143
144
145 assert(!current_incoming);
146 current_incoming = g_new0(MigrationIncomingState, 1);
147 current_incoming->state = MIGRATION_STATUS_NONE;
148 current_incoming->postcopy_remote_fds =
149 g_array_new(FALSE, TRUE, sizeof(struct PostCopyFD));
150 qemu_mutex_init(¤t_incoming->rp_mutex);
151 qemu_event_init(¤t_incoming->main_thread_load_event, false);
152 qemu_sem_init(¤t_incoming->postcopy_pause_sem_dst, 0);
153 qemu_sem_init(¤t_incoming->postcopy_pause_sem_fault, 0);
154
155 init_dirty_bitmap_incoming_migration();
156
157 if (!migration_object_check(current_migration, &err)) {
158 error_report_err(err);
159 exit(1);
160 }
161
162
163
164
165
166
167 if (ms->enforce_config_section) {
168 current_migration->send_configuration = true;
169 }
170}
171
172void migration_shutdown(void)
173{
174
175
176
177
178 migrate_fd_cancel(current_migration);
179 object_unref(OBJECT(current_migration));
180}
181
182
183MigrationState *migrate_get_current(void)
184{
185
186 assert(current_migration);
187 return current_migration;
188}
189
190MigrationIncomingState *migration_incoming_get_current(void)
191{
192 assert(current_incoming);
193 return current_incoming;
194}
195
196void migration_incoming_state_destroy(void)
197{
198 struct MigrationIncomingState *mis = migration_incoming_get_current();
199
200 if (mis->to_src_file) {
201
202 migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0);
203 qemu_fclose(mis->to_src_file);
204 mis->to_src_file = NULL;
205 }
206
207 if (mis->from_src_file) {
208 qemu_fclose(mis->from_src_file);
209 mis->from_src_file = NULL;
210 }
211 if (mis->postcopy_remote_fds) {
212 g_array_free(mis->postcopy_remote_fds, TRUE);
213 mis->postcopy_remote_fds = NULL;
214 }
215
216 qemu_event_reset(&mis->main_thread_load_event);
217
218 if (mis->socket_address_list) {
219 qapi_free_SocketAddressList(mis->socket_address_list);
220 mis->socket_address_list = NULL;
221 }
222}
223
224static void migrate_generate_event(int new_state)
225{
226 if (migrate_use_events()) {
227 qapi_event_send_migration(new_state);
228 }
229}
230
231static bool migrate_late_block_activate(void)
232{
233 MigrationState *s;
234
235 s = migrate_get_current();
236
237 return s->enabled_capabilities[
238 MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE];
239}
240
241
242
243
244
245
246static void deferred_incoming_migration(Error **errp)
247{
248 if (deferred_incoming) {
249 error_setg(errp, "Incoming migration already deferred");
250 }
251 deferred_incoming = true;
252}
253
254
255
256
257
258static int migrate_send_rp_message(MigrationIncomingState *mis,
259 enum mig_rp_message_type message_type,
260 uint16_t len, void *data)
261{
262 int ret = 0;
263
264 trace_migrate_send_rp_message((int)message_type, len);
265 qemu_mutex_lock(&mis->rp_mutex);
266
267
268
269
270
271 if (!mis->to_src_file) {
272 ret = -EIO;
273 goto error;
274 }
275
276 qemu_put_be16(mis->to_src_file, (unsigned int)message_type);
277 qemu_put_be16(mis->to_src_file, len);
278 qemu_put_buffer(mis->to_src_file, data, len);
279 qemu_fflush(mis->to_src_file);
280
281
282 ret = qemu_file_get_error(mis->to_src_file);
283
284error:
285 qemu_mutex_unlock(&mis->rp_mutex);
286 return ret;
287}
288
289
290
291
292
293
294
295
296int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname,
297 ram_addr_t start, size_t len)
298{
299 uint8_t bufc[12 + 1 + 255];
300 size_t msglen = 12;
301 enum mig_rp_message_type msg_type;
302
303 *(uint64_t *)bufc = cpu_to_be64((uint64_t)start);
304 *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len);
305
306 if (rbname) {
307 int rbname_len = strlen(rbname);
308 assert(rbname_len < 256);
309
310 bufc[msglen++] = rbname_len;
311 memcpy(bufc + msglen, rbname, rbname_len);
312 msglen += rbname_len;
313 msg_type = MIG_RP_MSG_REQ_PAGES_ID;
314 } else {
315 msg_type = MIG_RP_MSG_REQ_PAGES;
316 }
317
318 return migrate_send_rp_message(mis, msg_type, msglen, bufc);
319}
320
321static bool migration_colo_enabled;
322bool migration_incoming_colo_enabled(void)
323{
324 return migration_colo_enabled;
325}
326
327void migration_incoming_disable_colo(void)
328{
329 migration_colo_enabled = false;
330}
331
332void migration_incoming_enable_colo(void)
333{
334 migration_colo_enabled = true;
335}
336
337void migrate_add_address(SocketAddress *address)
338{
339 MigrationIncomingState *mis = migration_incoming_get_current();
340 SocketAddressList *addrs;
341
342 addrs = g_new0(SocketAddressList, 1);
343 addrs->next = mis->socket_address_list;
344 mis->socket_address_list = addrs;
345 addrs->value = QAPI_CLONE(SocketAddress, address);
346}
347
348void qemu_start_incoming_migration(const char *uri, Error **errp)
349{
350 const char *p;
351
352 qapi_event_send_migration(MIGRATION_STATUS_SETUP);
353 if (!strcmp(uri, "defer")) {
354 deferred_incoming_migration(errp);
355 } else if (strstart(uri, "tcp:", &p)) {
356 tcp_start_incoming_migration(p, errp);
357#ifdef CONFIG_RDMA
358 } else if (strstart(uri, "rdma:", &p)) {
359 rdma_start_incoming_migration(p, errp);
360#endif
361 } else if (strstart(uri, "exec:", &p)) {
362 exec_start_incoming_migration(p, errp);
363 } else if (strstart(uri, "unix:", &p)) {
364 unix_start_incoming_migration(p, errp);
365 } else if (strstart(uri, "fd:", &p)) {
366 fd_start_incoming_migration(p, errp);
367 } else {
368 error_setg(errp, "unknown migration protocol: %s", uri);
369 }
370}
371
372static void process_incoming_migration_bh(void *opaque)
373{
374 Error *local_err = NULL;
375 MigrationIncomingState *mis = opaque;
376
377
378
379
380
381
382
383 if (!migrate_late_block_activate() ||
384 (autostart && (!global_state_received() ||
385 global_state_get_runstate() == RUN_STATE_RUNNING))) {
386
387
388 bdrv_invalidate_cache_all(&local_err);
389 if (local_err) {
390 error_report_err(local_err);
391 local_err = NULL;
392 autostart = false;
393 }
394 }
395
396
397
398
399
400 qemu_announce_self(&mis->announce_timer, migrate_announce_params());
401
402 if (multifd_load_cleanup(&local_err) != 0) {
403 error_report_err(local_err);
404 autostart = false;
405 }
406
407
408
409
410 dirty_bitmap_mig_before_vm_start();
411
412 if (!global_state_received() ||
413 global_state_get_runstate() == RUN_STATE_RUNNING) {
414 if (autostart) {
415 vm_start();
416 } else {
417 runstate_set(RUN_STATE_PAUSED);
418 }
419 } else if (migration_incoming_colo_enabled()) {
420 migration_incoming_disable_colo();
421 vm_start();
422 } else {
423 runstate_set(global_state_get_runstate());
424 }
425
426
427
428
429
430 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
431 MIGRATION_STATUS_COMPLETED);
432 qemu_bh_delete(mis->bh);
433 migration_incoming_state_destroy();
434}
435
436static void process_incoming_migration_co(void *opaque)
437{
438 MigrationIncomingState *mis = migration_incoming_get_current();
439 PostcopyState ps;
440 int ret;
441 Error *local_err = NULL;
442
443 assert(mis->from_src_file);
444 mis->migration_incoming_co = qemu_coroutine_self();
445 mis->largest_page_size = qemu_ram_pagesize_largest();
446 postcopy_state_set(POSTCOPY_INCOMING_NONE);
447 migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
448 MIGRATION_STATUS_ACTIVE);
449 ret = qemu_loadvm_state(mis->from_src_file);
450
451 ps = postcopy_state_get();
452 trace_process_incoming_migration_co_end(ret, ps);
453 if (ps != POSTCOPY_INCOMING_NONE) {
454 if (ps == POSTCOPY_INCOMING_ADVISE) {
455
456
457
458
459
460 postcopy_ram_incoming_cleanup(mis);
461 } else if (ret >= 0) {
462
463
464
465
466 trace_process_incoming_migration_co_postcopy_end_main();
467 return;
468 }
469
470 }
471
472
473 if (!ret && migration_incoming_colo_enabled()) {
474
475 bdrv_invalidate_cache_all(&local_err);
476 if (local_err) {
477 error_report_err(local_err);
478 goto fail;
479 }
480
481 if (colo_init_ram_cache() < 0) {
482 error_report("Init ram cache failed");
483 goto fail;
484 }
485
486 qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming",
487 colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE);
488 mis->have_colo_incoming_thread = true;
489 qemu_coroutine_yield();
490
491
492 qemu_thread_join(&mis->colo_incoming_thread);
493
494 colo_release_ram_cache();
495 }
496
497 if (ret < 0) {
498 error_report("load of migration failed: %s", strerror(-ret));
499 goto fail;
500 }
501 mis->bh = qemu_bh_new(process_incoming_migration_bh, mis);
502 qemu_bh_schedule(mis->bh);
503 mis->migration_incoming_co = NULL;
504 return;
505fail:
506 local_err = NULL;
507 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
508 MIGRATION_STATUS_FAILED);
509 qemu_fclose(mis->from_src_file);
510 if (multifd_load_cleanup(&local_err) != 0) {
511 error_report_err(local_err);
512 }
513 exit(EXIT_FAILURE);
514}
515
516static void migration_incoming_setup(QEMUFile *f)
517{
518 MigrationIncomingState *mis = migration_incoming_get_current();
519
520 if (multifd_load_setup() != 0) {
521
522
523 exit(EXIT_FAILURE);
524 }
525
526 if (!mis->from_src_file) {
527 mis->from_src_file = f;
528 }
529 qemu_file_set_blocking(f, false);
530}
531
532void migration_incoming_process(void)
533{
534 Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL);
535 qemu_coroutine_enter(co);
536}
537
538
539static bool postcopy_try_recover(QEMUFile *f)
540{
541 MigrationIncomingState *mis = migration_incoming_get_current();
542
543 if (mis->state == MIGRATION_STATUS_POSTCOPY_PAUSED) {
544
545
546 mis->from_src_file = f;
547
548 qemu_file_set_blocking(f, true);
549
550
551 mis->to_src_file = qemu_file_get_return_path(f);
552
553 migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_PAUSED,
554 MIGRATION_STATUS_POSTCOPY_RECOVER);
555
556
557
558
559
560
561
562
563 qemu_sem_post(&mis->postcopy_pause_sem_dst);
564 return true;
565 }
566
567 return false;
568}
569
570void migration_fd_process_incoming(QEMUFile *f)
571{
572 if (postcopy_try_recover(f)) {
573 return;
574 }
575
576 migration_incoming_setup(f);
577 migration_incoming_process();
578}
579
580void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp)
581{
582 MigrationIncomingState *mis = migration_incoming_get_current();
583 bool start_migration;
584
585 if (!mis->from_src_file) {
586
587 QEMUFile *f = qemu_fopen_channel_input(ioc);
588
589
590 if (postcopy_try_recover(f)) {
591 return;
592 }
593
594 migration_incoming_setup(f);
595
596
597
598
599
600 start_migration = !migrate_use_multifd();
601 } else {
602 Error *local_err = NULL;
603
604 assert(migrate_use_multifd());
605 start_migration = multifd_recv_new_channel(ioc, &local_err);
606 if (local_err) {
607 error_propagate(errp, local_err);
608 return;
609 }
610 }
611
612 if (start_migration) {
613 migration_incoming_process();
614 }
615}
616
617
618
619
620
621
622
623bool migration_has_all_channels(void)
624{
625 MigrationIncomingState *mis = migration_incoming_get_current();
626 bool all_channels;
627
628 all_channels = multifd_recv_all_channels_created();
629
630 return all_channels && mis->from_src_file != NULL;
631}
632
633
634
635
636
637
638void migrate_send_rp_shut(MigrationIncomingState *mis,
639 uint32_t value)
640{
641 uint32_t buf;
642
643 buf = cpu_to_be32(value);
644 migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf);
645}
646
647
648
649
650
651void migrate_send_rp_pong(MigrationIncomingState *mis,
652 uint32_t value)
653{
654 uint32_t buf;
655
656 buf = cpu_to_be32(value);
657 migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf);
658}
659
660void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis,
661 char *block_name)
662{
663 char buf[512];
664 int len;
665 int64_t res;
666
667
668
669
670
671 len = strlen(block_name);
672 buf[0] = len;
673 memcpy(buf + 1, block_name, len);
674
675 if (mis->state != MIGRATION_STATUS_POSTCOPY_RECOVER) {
676 error_report("%s: MSG_RP_RECV_BITMAP only used for recovery",
677 __func__);
678 return;
679 }
680
681 migrate_send_rp_message(mis, MIG_RP_MSG_RECV_BITMAP, len + 1, buf);
682
683
684
685
686
687
688
689
690
691
692 qemu_mutex_lock(&mis->rp_mutex);
693 res = ramblock_recv_bitmap_send(mis->to_src_file, block_name);
694 qemu_mutex_unlock(&mis->rp_mutex);
695
696 trace_migrate_send_rp_recv_bitmap(block_name, res);
697}
698
699void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value)
700{
701 uint32_t buf;
702
703 buf = cpu_to_be32(value);
704 migrate_send_rp_message(mis, MIG_RP_MSG_RESUME_ACK, sizeof(buf), &buf);
705}
706
707MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
708{
709 MigrationCapabilityStatusList *head = NULL;
710 MigrationCapabilityStatusList *caps;
711 MigrationState *s = migrate_get_current();
712 int i;
713
714 caps = NULL;
715 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
716#ifndef CONFIG_LIVE_BLOCK_MIGRATION
717 if (i == MIGRATION_CAPABILITY_BLOCK) {
718 continue;
719 }
720#endif
721 if (head == NULL) {
722 head = g_malloc0(sizeof(*caps));
723 caps = head;
724 } else {
725 caps->next = g_malloc0(sizeof(*caps));
726 caps = caps->next;
727 }
728 caps->value =
729 g_malloc(sizeof(*caps->value));
730 caps->value->capability = i;
731 caps->value->state = s->enabled_capabilities[i];
732 }
733
734 return head;
735}
736
737MigrationParameters *qmp_query_migrate_parameters(Error **errp)
738{
739 MigrationParameters *params;
740 MigrationState *s = migrate_get_current();
741
742
743 params = g_malloc0(sizeof(*params));
744 params->has_compress_level = true;
745 params->compress_level = s->parameters.compress_level;
746 params->has_compress_threads = true;
747 params->compress_threads = s->parameters.compress_threads;
748 params->has_compress_wait_thread = true;
749 params->compress_wait_thread = s->parameters.compress_wait_thread;
750 params->has_decompress_threads = true;
751 params->decompress_threads = s->parameters.decompress_threads;
752 params->has_cpu_throttle_initial = true;
753 params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
754 params->has_cpu_throttle_increment = true;
755 params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
756 params->has_tls_creds = true;
757 params->tls_creds = g_strdup(s->parameters.tls_creds);
758 params->has_tls_hostname = true;
759 params->tls_hostname = g_strdup(s->parameters.tls_hostname);
760 params->has_tls_authz = true;
761 params->tls_authz = g_strdup(s->parameters.tls_authz);
762 params->has_max_bandwidth = true;
763 params->max_bandwidth = s->parameters.max_bandwidth;
764 params->has_downtime_limit = true;
765 params->downtime_limit = s->parameters.downtime_limit;
766 params->has_x_checkpoint_delay = true;
767 params->x_checkpoint_delay = s->parameters.x_checkpoint_delay;
768 params->has_block_incremental = true;
769 params->block_incremental = s->parameters.block_incremental;
770 params->has_multifd_channels = true;
771 params->multifd_channels = s->parameters.multifd_channels;
772 params->has_xbzrle_cache_size = true;
773 params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
774 params->has_max_postcopy_bandwidth = true;
775 params->max_postcopy_bandwidth = s->parameters.max_postcopy_bandwidth;
776 params->has_max_cpu_throttle = true;
777 params->max_cpu_throttle = s->parameters.max_cpu_throttle;
778 params->has_announce_initial = true;
779 params->announce_initial = s->parameters.announce_initial;
780 params->has_announce_max = true;
781 params->announce_max = s->parameters.announce_max;
782 params->has_announce_rounds = true;
783 params->announce_rounds = s->parameters.announce_rounds;
784 params->has_announce_step = true;
785 params->announce_step = s->parameters.announce_step;
786
787 return params;
788}
789
790AnnounceParameters *migrate_announce_params(void)
791{
792 static AnnounceParameters ap;
793
794 MigrationState *s = migrate_get_current();
795
796 ap.initial = s->parameters.announce_initial;
797 ap.max = s->parameters.announce_max;
798 ap.rounds = s->parameters.announce_rounds;
799 ap.step = s->parameters.announce_step;
800
801 return ≈
802}
803
804
805
806
807
808bool migration_is_setup_or_active(int state)
809{
810 switch (state) {
811 case MIGRATION_STATUS_ACTIVE:
812 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
813 case MIGRATION_STATUS_POSTCOPY_PAUSED:
814 case MIGRATION_STATUS_POSTCOPY_RECOVER:
815 case MIGRATION_STATUS_SETUP:
816 case MIGRATION_STATUS_PRE_SWITCHOVER:
817 case MIGRATION_STATUS_DEVICE:
818 return true;
819
820 default:
821 return false;
822
823 }
824}
825
826static void populate_ram_info(MigrationInfo *info, MigrationState *s)
827{
828 info->has_ram = true;
829 info->ram = g_malloc0(sizeof(*info->ram));
830 info->ram->transferred = ram_counters.transferred;
831 info->ram->total = ram_bytes_total();
832 info->ram->duplicate = ram_counters.duplicate;
833
834 info->ram->skipped = 0;
835 info->ram->normal = ram_counters.normal;
836 info->ram->normal_bytes = ram_counters.normal *
837 qemu_target_page_size();
838 info->ram->mbps = s->mbps;
839 info->ram->dirty_sync_count = ram_counters.dirty_sync_count;
840 info->ram->postcopy_requests = ram_counters.postcopy_requests;
841 info->ram->page_size = qemu_target_page_size();
842 info->ram->multifd_bytes = ram_counters.multifd_bytes;
843 info->ram->pages_per_second = s->pages_per_second;
844
845 if (migrate_use_xbzrle()) {
846 info->has_xbzrle_cache = true;
847 info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
848 info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
849 info->xbzrle_cache->bytes = xbzrle_counters.bytes;
850 info->xbzrle_cache->pages = xbzrle_counters.pages;
851 info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss;
852 info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate;
853 info->xbzrle_cache->overflow = xbzrle_counters.overflow;
854 }
855
856 if (migrate_use_compression()) {
857 info->has_compression = true;
858 info->compression = g_malloc0(sizeof(*info->compression));
859 info->compression->pages = compression_counters.pages;
860 info->compression->busy = compression_counters.busy;
861 info->compression->busy_rate = compression_counters.busy_rate;
862 info->compression->compressed_size =
863 compression_counters.compressed_size;
864 info->compression->compression_rate =
865 compression_counters.compression_rate;
866 }
867
868 if (cpu_throttle_active()) {
869 info->has_cpu_throttle_percentage = true;
870 info->cpu_throttle_percentage = cpu_throttle_get_percentage();
871 }
872
873 if (s->state != MIGRATION_STATUS_COMPLETED) {
874 info->ram->remaining = ram_bytes_remaining();
875 info->ram->dirty_pages_rate = ram_counters.dirty_pages_rate;
876 }
877}
878
879static void populate_disk_info(MigrationInfo *info)
880{
881 if (blk_mig_active()) {
882 info->has_disk = true;
883 info->disk = g_malloc0(sizeof(*info->disk));
884 info->disk->transferred = blk_mig_bytes_transferred();
885 info->disk->remaining = blk_mig_bytes_remaining();
886 info->disk->total = blk_mig_bytes_total();
887 }
888}
889
890static void fill_source_migration_info(MigrationInfo *info)
891{
892 MigrationState *s = migrate_get_current();
893
894 switch (s->state) {
895 case MIGRATION_STATUS_NONE:
896
897
898 return;
899 break;
900 case MIGRATION_STATUS_SETUP:
901 info->has_status = true;
902 info->has_total_time = false;
903 break;
904 case MIGRATION_STATUS_ACTIVE:
905 case MIGRATION_STATUS_CANCELLING:
906 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
907 case MIGRATION_STATUS_PRE_SWITCHOVER:
908 case MIGRATION_STATUS_DEVICE:
909 case MIGRATION_STATUS_POSTCOPY_PAUSED:
910 case MIGRATION_STATUS_POSTCOPY_RECOVER:
911
912 info->has_status = true;
913 info->has_total_time = true;
914 info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
915 - s->start_time;
916 info->has_expected_downtime = true;
917 info->expected_downtime = s->expected_downtime;
918 info->has_setup_time = true;
919 info->setup_time = s->setup_time;
920
921 populate_ram_info(info, s);
922 populate_disk_info(info);
923 break;
924 case MIGRATION_STATUS_COLO:
925 info->has_status = true;
926
927 break;
928 case MIGRATION_STATUS_COMPLETED:
929 info->has_status = true;
930 info->has_total_time = true;
931 info->total_time = s->total_time;
932 info->has_downtime = true;
933 info->downtime = s->downtime;
934 info->has_setup_time = true;
935 info->setup_time = s->setup_time;
936
937 populate_ram_info(info, s);
938 break;
939 case MIGRATION_STATUS_FAILED:
940 info->has_status = true;
941 if (s->error) {
942 info->has_error_desc = true;
943 info->error_desc = g_strdup(error_get_pretty(s->error));
944 }
945 break;
946 case MIGRATION_STATUS_CANCELLED:
947 info->has_status = true;
948 break;
949 }
950 info->status = s->state;
951}
952
953
954
955
956
957
958
959
960
961
962static bool migrate_caps_check(bool *cap_list,
963 MigrationCapabilityStatusList *params,
964 Error **errp)
965{
966 MigrationCapabilityStatusList *cap;
967 bool old_postcopy_cap;
968 MigrationIncomingState *mis = migration_incoming_get_current();
969
970 old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM];
971
972 for (cap = params; cap; cap = cap->next) {
973 cap_list[cap->value->capability] = cap->value->state;
974 }
975
976#ifndef CONFIG_LIVE_BLOCK_MIGRATION
977 if (cap_list[MIGRATION_CAPABILITY_BLOCK]) {
978 error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
979 "block migration");
980 error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
981 return false;
982 }
983#endif
984
985#ifndef CONFIG_REPLICATION
986 if (cap_list[MIGRATION_CAPABILITY_X_COLO]) {
987 error_setg(errp, "QEMU compiled without replication module"
988 " can't enable COLO");
989 error_append_hint(errp, "Please enable replication before COLO.\n");
990 return false;
991 }
992#endif
993
994 if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
995 if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) {
996
997
998
999
1000
1001 error_setg(errp, "Postcopy is not currently compatible "
1002 "with compression");
1003 return false;
1004 }
1005
1006
1007
1008
1009
1010 if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) &&
1011 !postcopy_ram_supported_by_host(mis)) {
1012
1013
1014
1015 error_setg(errp, "Postcopy is not supported");
1016 return false;
1017 }
1018
1019 if (cap_list[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
1020 error_setg(errp, "Postcopy is not compatible with ignore-shared");
1021 return false;
1022 }
1023 }
1024
1025 return true;
1026}
1027
1028static void fill_destination_migration_info(MigrationInfo *info)
1029{
1030 MigrationIncomingState *mis = migration_incoming_get_current();
1031
1032 if (mis->socket_address_list) {
1033 info->has_socket_address = true;
1034 info->socket_address =
1035 QAPI_CLONE(SocketAddressList, mis->socket_address_list);
1036 }
1037
1038 switch (mis->state) {
1039 case MIGRATION_STATUS_NONE:
1040 return;
1041 break;
1042 case MIGRATION_STATUS_SETUP:
1043 case MIGRATION_STATUS_CANCELLING:
1044 case MIGRATION_STATUS_CANCELLED:
1045 case MIGRATION_STATUS_ACTIVE:
1046 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
1047 case MIGRATION_STATUS_POSTCOPY_PAUSED:
1048 case MIGRATION_STATUS_POSTCOPY_RECOVER:
1049 case MIGRATION_STATUS_FAILED:
1050 case MIGRATION_STATUS_COLO:
1051 info->has_status = true;
1052 break;
1053 case MIGRATION_STATUS_COMPLETED:
1054 info->has_status = true;
1055 fill_destination_postcopy_migration_info(info);
1056 break;
1057 }
1058 info->status = mis->state;
1059}
1060
1061MigrationInfo *qmp_query_migrate(Error **errp)
1062{
1063 MigrationInfo *info = g_malloc0(sizeof(*info));
1064
1065 fill_destination_migration_info(info);
1066 fill_source_migration_info(info);
1067
1068 return info;
1069}
1070
1071void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
1072 Error **errp)
1073{
1074 MigrationState *s = migrate_get_current();
1075 MigrationCapabilityStatusList *cap;
1076 bool cap_list[MIGRATION_CAPABILITY__MAX];
1077
1078 if (migration_is_setup_or_active(s->state)) {
1079 error_setg(errp, QERR_MIGRATION_ACTIVE);
1080 return;
1081 }
1082
1083 memcpy(cap_list, s->enabled_capabilities, sizeof(cap_list));
1084 if (!migrate_caps_check(cap_list, params, errp)) {
1085 return;
1086 }
1087
1088 for (cap = params; cap; cap = cap->next) {
1089 s->enabled_capabilities[cap->value->capability] = cap->value->state;
1090 }
1091}
1092
1093
1094
1095
1096
1097static bool migrate_params_check(MigrationParameters *params, Error **errp)
1098{
1099 if (params->has_compress_level &&
1100 (params->compress_level > 9)) {
1101 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
1102 "is invalid, it should be in the range of 0 to 9");
1103 return false;
1104 }
1105
1106 if (params->has_compress_threads && (params->compress_threads < 1)) {
1107 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1108 "compress_threads",
1109 "is invalid, it should be in the range of 1 to 255");
1110 return false;
1111 }
1112
1113 if (params->has_decompress_threads && (params->decompress_threads < 1)) {
1114 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1115 "decompress_threads",
1116 "is invalid, it should be in the range of 1 to 255");
1117 return false;
1118 }
1119
1120 if (params->has_cpu_throttle_initial &&
1121 (params->cpu_throttle_initial < 1 ||
1122 params->cpu_throttle_initial > 99)) {
1123 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1124 "cpu_throttle_initial",
1125 "an integer in the range of 1 to 99");
1126 return false;
1127 }
1128
1129 if (params->has_cpu_throttle_increment &&
1130 (params->cpu_throttle_increment < 1 ||
1131 params->cpu_throttle_increment > 99)) {
1132 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1133 "cpu_throttle_increment",
1134 "an integer in the range of 1 to 99");
1135 return false;
1136 }
1137
1138 if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) {
1139 error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the"
1140 " range of 0 to %zu bytes/second", SIZE_MAX);
1141 return false;
1142 }
1143
1144 if (params->has_downtime_limit &&
1145 (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
1146 error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
1147 "the range of 0 to %d milliseconds",
1148 MAX_MIGRATE_DOWNTIME);
1149 return false;
1150 }
1151
1152
1153
1154 if (params->has_multifd_channels && (params->multifd_channels < 1)) {
1155 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1156 "multifd_channels",
1157 "is invalid, it should be in the range of 1 to 255");
1158 return false;
1159 }
1160
1161 if (params->has_xbzrle_cache_size &&
1162 (params->xbzrle_cache_size < qemu_target_page_size() ||
1163 !is_power_of_2(params->xbzrle_cache_size))) {
1164 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1165 "xbzrle_cache_size",
1166 "is invalid, it should be bigger than target page size"
1167 " and a power of two");
1168 return false;
1169 }
1170
1171 if (params->has_max_cpu_throttle &&
1172 (params->max_cpu_throttle < params->cpu_throttle_initial ||
1173 params->max_cpu_throttle > 99)) {
1174 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1175 "max_cpu_throttle",
1176 "an integer in the range of cpu_throttle_initial to 99");
1177 return false;
1178 }
1179
1180 if (params->has_announce_initial &&
1181 params->announce_initial > 100000) {
1182 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1183 "announce_initial",
1184 "is invalid, it must be less than 100000 ms");
1185 return false;
1186 }
1187 if (params->has_announce_max &&
1188 params->announce_max > 100000) {
1189 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1190 "announce_max",
1191 "is invalid, it must be less than 100000 ms");
1192 return false;
1193 }
1194 if (params->has_announce_rounds &&
1195 params->announce_rounds > 1000) {
1196 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1197 "announce_rounds",
1198 "is invalid, it must be in the range of 0 to 1000");
1199 return false;
1200 }
1201 if (params->has_announce_step &&
1202 (params->announce_step < 1 ||
1203 params->announce_step > 10000)) {
1204 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1205 "announce_step",
1206 "is invalid, it must be in the range of 1 to 10000 ms");
1207 return false;
1208 }
1209 return true;
1210}
1211
1212static void migrate_params_test_apply(MigrateSetParameters *params,
1213 MigrationParameters *dest)
1214{
1215 *dest = migrate_get_current()->parameters;
1216
1217
1218
1219 if (params->has_compress_level) {
1220 dest->compress_level = params->compress_level;
1221 }
1222
1223 if (params->has_compress_threads) {
1224 dest->compress_threads = params->compress_threads;
1225 }
1226
1227 if (params->has_compress_wait_thread) {
1228 dest->compress_wait_thread = params->compress_wait_thread;
1229 }
1230
1231 if (params->has_decompress_threads) {
1232 dest->decompress_threads = params->decompress_threads;
1233 }
1234
1235 if (params->has_cpu_throttle_initial) {
1236 dest->cpu_throttle_initial = params->cpu_throttle_initial;
1237 }
1238
1239 if (params->has_cpu_throttle_increment) {
1240 dest->cpu_throttle_increment = params->cpu_throttle_increment;
1241 }
1242
1243 if (params->has_tls_creds) {
1244 assert(params->tls_creds->type == QTYPE_QSTRING);
1245 dest->tls_creds = g_strdup(params->tls_creds->u.s);
1246 }
1247
1248 if (params->has_tls_hostname) {
1249 assert(params->tls_hostname->type == QTYPE_QSTRING);
1250 dest->tls_hostname = g_strdup(params->tls_hostname->u.s);
1251 }
1252
1253 if (params->has_max_bandwidth) {
1254 dest->max_bandwidth = params->max_bandwidth;
1255 }
1256
1257 if (params->has_downtime_limit) {
1258 dest->downtime_limit = params->downtime_limit;
1259 }
1260
1261 if (params->has_x_checkpoint_delay) {
1262 dest->x_checkpoint_delay = params->x_checkpoint_delay;
1263 }
1264
1265 if (params->has_block_incremental) {
1266 dest->block_incremental = params->block_incremental;
1267 }
1268 if (params->has_multifd_channels) {
1269 dest->multifd_channels = params->multifd_channels;
1270 }
1271 if (params->has_xbzrle_cache_size) {
1272 dest->xbzrle_cache_size = params->xbzrle_cache_size;
1273 }
1274 if (params->has_max_postcopy_bandwidth) {
1275 dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth;
1276 }
1277 if (params->has_max_cpu_throttle) {
1278 dest->max_cpu_throttle = params->max_cpu_throttle;
1279 }
1280 if (params->has_announce_initial) {
1281 dest->announce_initial = params->announce_initial;
1282 }
1283 if (params->has_announce_max) {
1284 dest->announce_max = params->announce_max;
1285 }
1286 if (params->has_announce_rounds) {
1287 dest->announce_rounds = params->announce_rounds;
1288 }
1289 if (params->has_announce_step) {
1290 dest->announce_step = params->announce_step;
1291 }
1292}
1293
1294static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
1295{
1296 MigrationState *s = migrate_get_current();
1297
1298
1299
1300 if (params->has_compress_level) {
1301 s->parameters.compress_level = params->compress_level;
1302 }
1303
1304 if (params->has_compress_threads) {
1305 s->parameters.compress_threads = params->compress_threads;
1306 }
1307
1308 if (params->has_compress_wait_thread) {
1309 s->parameters.compress_wait_thread = params->compress_wait_thread;
1310 }
1311
1312 if (params->has_decompress_threads) {
1313 s->parameters.decompress_threads = params->decompress_threads;
1314 }
1315
1316 if (params->has_cpu_throttle_initial) {
1317 s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
1318 }
1319
1320 if (params->has_cpu_throttle_increment) {
1321 s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
1322 }
1323
1324 if (params->has_tls_creds) {
1325 g_free(s->parameters.tls_creds);
1326 assert(params->tls_creds->type == QTYPE_QSTRING);
1327 s->parameters.tls_creds = g_strdup(params->tls_creds->u.s);
1328 }
1329
1330 if (params->has_tls_hostname) {
1331 g_free(s->parameters.tls_hostname);
1332 assert(params->tls_hostname->type == QTYPE_QSTRING);
1333 s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
1334 }
1335
1336 if (params->has_tls_authz) {
1337 g_free(s->parameters.tls_authz);
1338 assert(params->tls_authz->type == QTYPE_QSTRING);
1339 s->parameters.tls_authz = g_strdup(params->tls_authz->u.s);
1340 }
1341
1342 if (params->has_max_bandwidth) {
1343 s->parameters.max_bandwidth = params->max_bandwidth;
1344 if (s->to_dst_file && !migration_in_postcopy()) {
1345 qemu_file_set_rate_limit(s->to_dst_file,
1346 s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
1347 }
1348 }
1349
1350 if (params->has_downtime_limit) {
1351 s->parameters.downtime_limit = params->downtime_limit;
1352 }
1353
1354 if (params->has_x_checkpoint_delay) {
1355 s->parameters.x_checkpoint_delay = params->x_checkpoint_delay;
1356 if (migration_in_colo_state()) {
1357 colo_checkpoint_notify(s);
1358 }
1359 }
1360
1361 if (params->has_block_incremental) {
1362 s->parameters.block_incremental = params->block_incremental;
1363 }
1364 if (params->has_multifd_channels) {
1365 s->parameters.multifd_channels = params->multifd_channels;
1366 }
1367 if (params->has_xbzrle_cache_size) {
1368 s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
1369 xbzrle_cache_resize(params->xbzrle_cache_size, errp);
1370 }
1371 if (params->has_max_postcopy_bandwidth) {
1372 s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth;
1373 if (s->to_dst_file && migration_in_postcopy()) {
1374 qemu_file_set_rate_limit(s->to_dst_file,
1375 s->parameters.max_postcopy_bandwidth / XFER_LIMIT_RATIO);
1376 }
1377 }
1378 if (params->has_max_cpu_throttle) {
1379 s->parameters.max_cpu_throttle = params->max_cpu_throttle;
1380 }
1381 if (params->has_announce_initial) {
1382 s->parameters.announce_initial = params->announce_initial;
1383 }
1384 if (params->has_announce_max) {
1385 s->parameters.announce_max = params->announce_max;
1386 }
1387 if (params->has_announce_rounds) {
1388 s->parameters.announce_rounds = params->announce_rounds;
1389 }
1390 if (params->has_announce_step) {
1391 s->parameters.announce_step = params->announce_step;
1392 }
1393}
1394
1395void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
1396{
1397 MigrationParameters tmp;
1398
1399
1400 if (params->has_tls_creds
1401 && params->tls_creds->type == QTYPE_QNULL) {
1402 qobject_unref(params->tls_creds->u.n);
1403 params->tls_creds->type = QTYPE_QSTRING;
1404 params->tls_creds->u.s = strdup("");
1405 }
1406
1407 if (params->has_tls_hostname
1408 && params->tls_hostname->type == QTYPE_QNULL) {
1409 qobject_unref(params->tls_hostname->u.n);
1410 params->tls_hostname->type = QTYPE_QSTRING;
1411 params->tls_hostname->u.s = strdup("");
1412 }
1413
1414 migrate_params_test_apply(params, &tmp);
1415
1416 if (!migrate_params_check(&tmp, errp)) {
1417
1418 return;
1419 }
1420
1421 migrate_params_apply(params, errp);
1422}
1423
1424
1425void qmp_migrate_start_postcopy(Error **errp)
1426{
1427 MigrationState *s = migrate_get_current();
1428
1429 if (!migrate_postcopy()) {
1430 error_setg(errp, "Enable postcopy with migrate_set_capability before"
1431 " the start of migration");
1432 return;
1433 }
1434
1435 if (s->state == MIGRATION_STATUS_NONE) {
1436 error_setg(errp, "Postcopy must be started after migration has been"
1437 " started");
1438 return;
1439 }
1440
1441
1442
1443
1444 atomic_set(&s->start_postcopy, true);
1445}
1446
1447
1448
1449void migrate_set_state(int *state, int old_state, int new_state)
1450{
1451 assert(new_state < MIGRATION_STATUS__MAX);
1452 if (atomic_cmpxchg(state, old_state, new_state) == old_state) {
1453 trace_migrate_set_state(MigrationStatus_str(new_state));
1454 migrate_generate_event(new_state);
1455 }
1456}
1457
1458static MigrationCapabilityStatusList *migrate_cap_add(
1459 MigrationCapabilityStatusList *list,
1460 MigrationCapability index,
1461 bool state)
1462{
1463 MigrationCapabilityStatusList *cap;
1464
1465 cap = g_new0(MigrationCapabilityStatusList, 1);
1466 cap->value = g_new0(MigrationCapabilityStatus, 1);
1467 cap->value->capability = index;
1468 cap->value->state = state;
1469 cap->next = list;
1470
1471 return cap;
1472}
1473
1474void migrate_set_block_enabled(bool value, Error **errp)
1475{
1476 MigrationCapabilityStatusList *cap;
1477
1478 cap = migrate_cap_add(NULL, MIGRATION_CAPABILITY_BLOCK, value);
1479 qmp_migrate_set_capabilities(cap, errp);
1480 qapi_free_MigrationCapabilityStatusList(cap);
1481}
1482
1483static void migrate_set_block_incremental(MigrationState *s, bool value)
1484{
1485 s->parameters.block_incremental = value;
1486}
1487
1488static void block_cleanup_parameters(MigrationState *s)
1489{
1490 if (s->must_remove_block_options) {
1491
1492 migrate_set_block_enabled(false, &error_abort);
1493 migrate_set_block_incremental(s, false);
1494 s->must_remove_block_options = false;
1495 }
1496}
1497
1498static void migrate_fd_cleanup(MigrationState *s)
1499{
1500 qemu_bh_delete(s->cleanup_bh);
1501 s->cleanup_bh = NULL;
1502
1503 qemu_savevm_state_cleanup();
1504
1505 if (s->to_dst_file) {
1506 QEMUFile *tmp;
1507
1508 trace_migrate_fd_cleanup();
1509 qemu_mutex_unlock_iothread();
1510 if (s->migration_thread_running) {
1511 qemu_thread_join(&s->thread);
1512 s->migration_thread_running = false;
1513 }
1514 qemu_mutex_lock_iothread();
1515
1516 multifd_save_cleanup();
1517 qemu_mutex_lock(&s->qemu_file_lock);
1518 tmp = s->to_dst_file;
1519 s->to_dst_file = NULL;
1520 qemu_mutex_unlock(&s->qemu_file_lock);
1521
1522
1523
1524
1525 qemu_fclose(tmp);
1526 }
1527
1528 assert((s->state != MIGRATION_STATUS_ACTIVE) &&
1529 (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE));
1530
1531 if (s->state == MIGRATION_STATUS_CANCELLING) {
1532 migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING,
1533 MIGRATION_STATUS_CANCELLED);
1534 }
1535
1536 if (s->error) {
1537
1538 error_report_err(error_copy(s->error));
1539 }
1540 notifier_list_notify(&migration_state_notifiers, s);
1541 block_cleanup_parameters(s);
1542}
1543
1544static void migrate_fd_cleanup_schedule(MigrationState *s)
1545{
1546
1547
1548
1549
1550 object_ref(OBJECT(s));
1551 qemu_bh_schedule(s->cleanup_bh);
1552}
1553
1554static void migrate_fd_cleanup_bh(void *opaque)
1555{
1556 MigrationState *s = opaque;
1557 migrate_fd_cleanup(s);
1558 object_unref(OBJECT(s));
1559}
1560
1561void migrate_set_error(MigrationState *s, const Error *error)
1562{
1563 qemu_mutex_lock(&s->error_mutex);
1564 if (!s->error) {
1565 s->error = error_copy(error);
1566 }
1567 qemu_mutex_unlock(&s->error_mutex);
1568}
1569
1570void migrate_fd_error(MigrationState *s, const Error *error)
1571{
1572 trace_migrate_fd_error(error_get_pretty(error));
1573 assert(s->to_dst_file == NULL);
1574 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1575 MIGRATION_STATUS_FAILED);
1576 migrate_set_error(s, error);
1577}
1578
1579static void migrate_fd_cancel(MigrationState *s)
1580{
1581 int old_state ;
1582 QEMUFile *f = migrate_get_current()->to_dst_file;
1583 trace_migrate_fd_cancel();
1584
1585 if (s->rp_state.from_dst_file) {
1586
1587 qemu_file_shutdown(s->rp_state.from_dst_file);
1588 }
1589
1590 do {
1591 old_state = s->state;
1592 if (!migration_is_setup_or_active(old_state)) {
1593 break;
1594 }
1595
1596 if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) {
1597 qemu_sem_post(&s->pause_sem);
1598 }
1599 migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING);
1600 } while (s->state != MIGRATION_STATUS_CANCELLING);
1601
1602
1603
1604
1605
1606
1607
1608
1609 if (s->state == MIGRATION_STATUS_CANCELLING && f) {
1610 qemu_file_shutdown(f);
1611 }
1612 if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) {
1613 Error *local_err = NULL;
1614
1615 bdrv_invalidate_cache_all(&local_err);
1616 if (local_err) {
1617 error_report_err(local_err);
1618 } else {
1619 s->block_inactive = false;
1620 }
1621 }
1622}
1623
1624void add_migration_state_change_notifier(Notifier *notify)
1625{
1626 notifier_list_add(&migration_state_notifiers, notify);
1627}
1628
1629void remove_migration_state_change_notifier(Notifier *notify)
1630{
1631 notifier_remove(notify);
1632}
1633
1634bool migration_in_setup(MigrationState *s)
1635{
1636 return s->state == MIGRATION_STATUS_SETUP;
1637}
1638
1639bool migration_has_finished(MigrationState *s)
1640{
1641 return s->state == MIGRATION_STATUS_COMPLETED;
1642}
1643
1644bool migration_has_failed(MigrationState *s)
1645{
1646 return (s->state == MIGRATION_STATUS_CANCELLED ||
1647 s->state == MIGRATION_STATUS_FAILED);
1648}
1649
1650bool migration_in_postcopy(void)
1651{
1652 MigrationState *s = migrate_get_current();
1653
1654 return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
1655}
1656
1657bool migration_in_postcopy_after_devices(MigrationState *s)
1658{
1659 return migration_in_postcopy() && s->postcopy_after_devices;
1660}
1661
1662bool migration_is_idle(void)
1663{
1664 MigrationState *s = current_migration;
1665
1666 if (!s) {
1667 return true;
1668 }
1669
1670 switch (s->state) {
1671 case MIGRATION_STATUS_NONE:
1672 case MIGRATION_STATUS_CANCELLED:
1673 case MIGRATION_STATUS_COMPLETED:
1674 case MIGRATION_STATUS_FAILED:
1675 return true;
1676 case MIGRATION_STATUS_SETUP:
1677 case MIGRATION_STATUS_CANCELLING:
1678 case MIGRATION_STATUS_ACTIVE:
1679 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
1680 case MIGRATION_STATUS_COLO:
1681 case MIGRATION_STATUS_PRE_SWITCHOVER:
1682 case MIGRATION_STATUS_DEVICE:
1683 return false;
1684 case MIGRATION_STATUS__MAX:
1685 g_assert_not_reached();
1686 }
1687
1688 return false;
1689}
1690
1691void migrate_init(MigrationState *s)
1692{
1693
1694
1695
1696
1697
1698 s->bytes_xfer = 0;
1699 s->xfer_limit = 0;
1700 s->cleanup_bh = 0;
1701 s->to_dst_file = NULL;
1702 s->state = MIGRATION_STATUS_NONE;
1703 s->rp_state.from_dst_file = NULL;
1704 s->rp_state.error = false;
1705 s->mbps = 0.0;
1706 s->pages_per_second = 0.0;
1707 s->downtime = 0;
1708 s->expected_downtime = 0;
1709 s->setup_time = 0;
1710 s->start_postcopy = false;
1711 s->postcopy_after_devices = false;
1712 s->migration_thread_running = false;
1713 error_free(s->error);
1714 s->error = NULL;
1715
1716 migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
1717
1718 s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
1719 s->total_time = 0;
1720 s->vm_was_running = false;
1721 s->iteration_initial_bytes = 0;
1722 s->threshold_size = 0;
1723}
1724
1725static GSList *migration_blockers;
1726
1727int migrate_add_blocker(Error *reason, Error **errp)
1728{
1729 if (only_migratable) {
1730 error_propagate_prepend(errp, error_copy(reason),
1731 "disallowing migration blocker "
1732 "(--only_migratable) for: ");
1733 return -EACCES;
1734 }
1735
1736 if (migration_is_idle()) {
1737 migration_blockers = g_slist_prepend(migration_blockers, reason);
1738 return 0;
1739 }
1740
1741 error_propagate_prepend(errp, error_copy(reason),
1742 "disallowing migration blocker "
1743 "(migration in progress) for: ");
1744 return -EBUSY;
1745}
1746
1747void migrate_del_blocker(Error *reason)
1748{
1749 migration_blockers = g_slist_remove(migration_blockers, reason);
1750}
1751
1752void qmp_migrate_incoming(const char *uri, Error **errp)
1753{
1754 Error *local_err = NULL;
1755 static bool once = true;
1756
1757 if (!deferred_incoming) {
1758 error_setg(errp, "For use with '-incoming defer'");
1759 return;
1760 }
1761 if (!once) {
1762 error_setg(errp, "The incoming migration has already been started");
1763 }
1764
1765 qemu_start_incoming_migration(uri, &local_err);
1766
1767 if (local_err) {
1768 error_propagate(errp, local_err);
1769 return;
1770 }
1771
1772 once = false;
1773}
1774
1775void qmp_migrate_recover(const char *uri, Error **errp)
1776{
1777 MigrationIncomingState *mis = migration_incoming_get_current();
1778
1779 if (mis->state != MIGRATION_STATUS_POSTCOPY_PAUSED) {
1780 error_setg(errp, "Migrate recover can only be run "
1781 "when postcopy is paused.");
1782 return;
1783 }
1784
1785 if (atomic_cmpxchg(&mis->postcopy_recover_triggered,
1786 false, true) == true) {
1787 error_setg(errp, "Migrate recovery is triggered already");
1788 return;
1789 }
1790
1791
1792
1793
1794
1795
1796 qemu_start_incoming_migration(uri, errp);
1797}
1798
1799void qmp_migrate_pause(Error **errp)
1800{
1801 MigrationState *ms = migrate_get_current();
1802 MigrationIncomingState *mis = migration_incoming_get_current();
1803 int ret;
1804
1805 if (ms->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
1806
1807 qemu_mutex_lock(&ms->qemu_file_lock);
1808 ret = qemu_file_shutdown(ms->to_dst_file);
1809 qemu_mutex_unlock(&ms->qemu_file_lock);
1810 if (ret) {
1811 error_setg(errp, "Failed to pause source migration");
1812 }
1813 return;
1814 }
1815
1816 if (mis->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
1817 ret = qemu_file_shutdown(mis->from_src_file);
1818 if (ret) {
1819 error_setg(errp, "Failed to pause destination migration");
1820 }
1821 return;
1822 }
1823
1824 error_setg(errp, "migrate-pause is currently only supported "
1825 "during postcopy-active state");
1826}
1827
1828bool migration_is_blocked(Error **errp)
1829{
1830 if (qemu_savevm_state_blocked(errp)) {
1831 return true;
1832 }
1833
1834 if (migration_blockers) {
1835 error_propagate(errp, error_copy(migration_blockers->data));
1836 return true;
1837 }
1838
1839 return false;
1840}
1841
1842
1843static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc,
1844 bool resume, Error **errp)
1845{
1846 Error *local_err = NULL;
1847
1848 if (resume) {
1849 if (s->state != MIGRATION_STATUS_POSTCOPY_PAUSED) {
1850 error_setg(errp, "Cannot resume if there is no "
1851 "paused migration");
1852 return false;
1853 }
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867 if (migrate_release_ram()) {
1868 error_setg(errp, "Postcopy recovery cannot work "
1869 "when release-ram capability is set");
1870 return false;
1871 }
1872
1873
1874 return true;
1875 }
1876
1877 if (migration_is_setup_or_active(s->state) ||
1878 s->state == MIGRATION_STATUS_CANCELLING ||
1879 s->state == MIGRATION_STATUS_COLO) {
1880 error_setg(errp, QERR_MIGRATION_ACTIVE);
1881 return false;
1882 }
1883
1884 if (runstate_check(RUN_STATE_INMIGRATE)) {
1885 error_setg(errp, "Guest is waiting for an incoming migration");
1886 return false;
1887 }
1888
1889 if (migration_is_blocked(errp)) {
1890 return false;
1891 }
1892
1893 if (blk || blk_inc) {
1894 if (migrate_use_block() || migrate_use_block_incremental()) {
1895 error_setg(errp, "Command options are incompatible with "
1896 "current migration capabilities");
1897 return false;
1898 }
1899 migrate_set_block_enabled(true, &local_err);
1900 if (local_err) {
1901 error_propagate(errp, local_err);
1902 return false;
1903 }
1904 s->must_remove_block_options = true;
1905 }
1906
1907 if (blk_inc) {
1908 migrate_set_block_incremental(s, true);
1909 }
1910
1911 migrate_init(s);
1912
1913 return true;
1914}
1915
1916void qmp_migrate(const char *uri, bool has_blk, bool blk,
1917 bool has_inc, bool inc, bool has_detach, bool detach,
1918 bool has_resume, bool resume, Error **errp)
1919{
1920 Error *local_err = NULL;
1921 MigrationState *s = migrate_get_current();
1922 const char *p;
1923
1924 if (!migrate_prepare(s, has_blk && blk, has_inc && inc,
1925 has_resume && resume, errp)) {
1926
1927 return;
1928 }
1929
1930 if (strstart(uri, "tcp:", &p)) {
1931 tcp_start_outgoing_migration(s, p, &local_err);
1932#ifdef CONFIG_RDMA
1933 } else if (strstart(uri, "rdma:", &p)) {
1934 rdma_start_outgoing_migration(s, p, &local_err);
1935#endif
1936 } else if (strstart(uri, "exec:", &p)) {
1937 exec_start_outgoing_migration(s, p, &local_err);
1938 } else if (strstart(uri, "unix:", &p)) {
1939 unix_start_outgoing_migration(s, p, &local_err);
1940 } else if (strstart(uri, "fd:", &p)) {
1941 fd_start_outgoing_migration(s, p, &local_err);
1942 } else {
1943 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
1944 "a valid migration protocol");
1945 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1946 MIGRATION_STATUS_FAILED);
1947 block_cleanup_parameters(s);
1948 return;
1949 }
1950
1951 if (local_err) {
1952 migrate_fd_error(s, local_err);
1953 error_propagate(errp, local_err);
1954 return;
1955 }
1956}
1957
1958void qmp_migrate_cancel(Error **errp)
1959{
1960 migrate_fd_cancel(migrate_get_current());
1961}
1962
1963void qmp_migrate_continue(MigrationStatus state, Error **errp)
1964{
1965 MigrationState *s = migrate_get_current();
1966 if (s->state != state) {
1967 error_setg(errp, "Migration not in expected state: %s",
1968 MigrationStatus_str(s->state));
1969 return;
1970 }
1971 qemu_sem_post(&s->pause_sem);
1972}
1973
1974void qmp_migrate_set_cache_size(int64_t value, Error **errp)
1975{
1976 MigrateSetParameters p = {
1977 .has_xbzrle_cache_size = true,
1978 .xbzrle_cache_size = value,
1979 };
1980
1981 qmp_migrate_set_parameters(&p, errp);
1982}
1983
1984int64_t qmp_query_migrate_cache_size(Error **errp)
1985{
1986 return migrate_xbzrle_cache_size();
1987}
1988
1989void qmp_migrate_set_speed(int64_t value, Error **errp)
1990{
1991 MigrateSetParameters p = {
1992 .has_max_bandwidth = true,
1993 .max_bandwidth = value,
1994 };
1995
1996 qmp_migrate_set_parameters(&p, errp);
1997}
1998
1999void qmp_migrate_set_downtime(double value, Error **errp)
2000{
2001 if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) {
2002 error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
2003 "the range of 0 to %d seconds",
2004 MAX_MIGRATE_DOWNTIME_SECONDS);
2005 return;
2006 }
2007
2008 value *= 1000;
2009 value = MAX(0, MIN(INT64_MAX, value));
2010
2011 MigrateSetParameters p = {
2012 .has_downtime_limit = true,
2013 .downtime_limit = value,
2014 };
2015
2016 qmp_migrate_set_parameters(&p, errp);
2017}
2018
2019bool migrate_release_ram(void)
2020{
2021 MigrationState *s;
2022
2023 s = migrate_get_current();
2024
2025 return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM];
2026}
2027
2028bool migrate_postcopy_ram(void)
2029{
2030 MigrationState *s;
2031
2032 s = migrate_get_current();
2033
2034 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
2035}
2036
2037bool migrate_postcopy(void)
2038{
2039 return migrate_postcopy_ram() || migrate_dirty_bitmaps();
2040}
2041
2042bool migrate_auto_converge(void)
2043{
2044 MigrationState *s;
2045
2046 s = migrate_get_current();
2047
2048 return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
2049}
2050
2051bool migrate_zero_blocks(void)
2052{
2053 MigrationState *s;
2054
2055 s = migrate_get_current();
2056
2057 return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
2058}
2059
2060bool migrate_postcopy_blocktime(void)
2061{
2062 MigrationState *s;
2063
2064 s = migrate_get_current();
2065
2066 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME];
2067}
2068
2069bool migrate_use_compression(void)
2070{
2071 MigrationState *s;
2072
2073 s = migrate_get_current();
2074
2075 return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
2076}
2077
2078int migrate_compress_level(void)
2079{
2080 MigrationState *s;
2081
2082 s = migrate_get_current();
2083
2084 return s->parameters.compress_level;
2085}
2086
2087int migrate_compress_threads(void)
2088{
2089 MigrationState *s;
2090
2091 s = migrate_get_current();
2092
2093 return s->parameters.compress_threads;
2094}
2095
2096int migrate_compress_wait_thread(void)
2097{
2098 MigrationState *s;
2099
2100 s = migrate_get_current();
2101
2102 return s->parameters.compress_wait_thread;
2103}
2104
2105int migrate_decompress_threads(void)
2106{
2107 MigrationState *s;
2108
2109 s = migrate_get_current();
2110
2111 return s->parameters.decompress_threads;
2112}
2113
2114bool migrate_dirty_bitmaps(void)
2115{
2116 MigrationState *s;
2117
2118 s = migrate_get_current();
2119
2120 return s->enabled_capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS];
2121}
2122
2123bool migrate_ignore_shared(void)
2124{
2125 MigrationState *s;
2126
2127 s = migrate_get_current();
2128
2129 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_IGNORE_SHARED];
2130}
2131
2132bool migrate_use_events(void)
2133{
2134 MigrationState *s;
2135
2136 s = migrate_get_current();
2137
2138 return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
2139}
2140
2141bool migrate_use_multifd(void)
2142{
2143 MigrationState *s;
2144
2145 s = migrate_get_current();
2146
2147 return s->enabled_capabilities[MIGRATION_CAPABILITY_MULTIFD];
2148}
2149
2150bool migrate_pause_before_switchover(void)
2151{
2152 MigrationState *s;
2153
2154 s = migrate_get_current();
2155
2156 return s->enabled_capabilities[
2157 MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
2158}
2159
2160int migrate_multifd_channels(void)
2161{
2162 MigrationState *s;
2163
2164 s = migrate_get_current();
2165
2166 return s->parameters.multifd_channels;
2167}
2168
2169int migrate_use_xbzrle(void)
2170{
2171 MigrationState *s;
2172
2173 s = migrate_get_current();
2174
2175 return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
2176}
2177
2178int64_t migrate_xbzrle_cache_size(void)
2179{
2180 MigrationState *s;
2181
2182 s = migrate_get_current();
2183
2184 return s->parameters.xbzrle_cache_size;
2185}
2186
2187static int64_t migrate_max_postcopy_bandwidth(void)
2188{
2189 MigrationState *s;
2190
2191 s = migrate_get_current();
2192
2193 return s->parameters.max_postcopy_bandwidth;
2194}
2195
2196bool migrate_use_block(void)
2197{
2198 MigrationState *s;
2199
2200 s = migrate_get_current();
2201
2202 return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK];
2203}
2204
2205bool migrate_use_return_path(void)
2206{
2207 MigrationState *s;
2208
2209 s = migrate_get_current();
2210
2211 return s->enabled_capabilities[MIGRATION_CAPABILITY_RETURN_PATH];
2212}
2213
2214bool migrate_use_block_incremental(void)
2215{
2216 MigrationState *s;
2217
2218 s = migrate_get_current();
2219
2220 return s->parameters.block_incremental;
2221}
2222
2223
2224
2225
2226
2227
2228static void mark_source_rp_bad(MigrationState *s)
2229{
2230 s->rp_state.error = true;
2231}
2232
2233static struct rp_cmd_args {
2234 ssize_t len;
2235 const char *name;
2236} rp_cmd_args[] = {
2237 [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" },
2238 [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" },
2239 [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" },
2240 [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" },
2241 [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" },
2242 [MIG_RP_MSG_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" },
2243 [MIG_RP_MSG_RESUME_ACK] = { .len = 4, .name = "RESUME_ACK" },
2244 [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" },
2245};
2246
2247
2248
2249
2250
2251
2252static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname,
2253 ram_addr_t start, size_t len)
2254{
2255 long our_host_ps = getpagesize();
2256
2257 trace_migrate_handle_rp_req_pages(rbname, start, len);
2258
2259
2260
2261
2262
2263 if (start & (our_host_ps-1) ||
2264 (len & (our_host_ps-1))) {
2265 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
2266 " len: %zd", __func__, start, len);
2267 mark_source_rp_bad(ms);
2268 return;
2269 }
2270
2271 if (ram_save_queue_pages(rbname, start, len)) {
2272 mark_source_rp_bad(ms);
2273 }
2274}
2275
2276
2277static bool postcopy_pause_return_path_thread(MigrationState *s)
2278{
2279 trace_postcopy_pause_return_path();
2280
2281 qemu_sem_wait(&s->postcopy_pause_rp_sem);
2282
2283 trace_postcopy_pause_return_path_continued();
2284
2285 return true;
2286}
2287
2288static int migrate_handle_rp_recv_bitmap(MigrationState *s, char *block_name)
2289{
2290 RAMBlock *block = qemu_ram_block_by_name(block_name);
2291
2292 if (!block) {
2293 error_report("%s: invalid block name '%s'", __func__, block_name);
2294 return -EINVAL;
2295 }
2296
2297
2298 return ram_dirty_bitmap_reload(s, block);
2299}
2300
2301static int migrate_handle_rp_resume_ack(MigrationState *s, uint32_t value)
2302{
2303 trace_source_return_path_thread_resume_ack(value);
2304
2305 if (value != MIGRATION_RESUME_ACK_VALUE) {
2306 error_report("%s: illegal resume_ack value %"PRIu32,
2307 __func__, value);
2308 return -1;
2309 }
2310
2311
2312 migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_RECOVER,
2313 MIGRATION_STATUS_POSTCOPY_ACTIVE);
2314
2315
2316 qemu_sem_post(&s->rp_state.rp_sem);
2317
2318 return 0;
2319}
2320
2321
2322
2323
2324
2325static void *source_return_path_thread(void *opaque)
2326{
2327 MigrationState *ms = opaque;
2328 QEMUFile *rp = ms->rp_state.from_dst_file;
2329 uint16_t header_len, header_type;
2330 uint8_t buf[512];
2331 uint32_t tmp32, sibling_error;
2332 ram_addr_t start = 0;
2333 size_t len = 0, expected_len;
2334 int res;
2335
2336 trace_source_return_path_thread_entry();
2337 rcu_register_thread();
2338
2339retry:
2340 while (!ms->rp_state.error && !qemu_file_get_error(rp) &&
2341 migration_is_setup_or_active(ms->state)) {
2342 trace_source_return_path_thread_loop_top();
2343 header_type = qemu_get_be16(rp);
2344 header_len = qemu_get_be16(rp);
2345
2346 if (qemu_file_get_error(rp)) {
2347 mark_source_rp_bad(ms);
2348 goto out;
2349 }
2350
2351 if (header_type >= MIG_RP_MSG_MAX ||
2352 header_type == MIG_RP_MSG_INVALID) {
2353 error_report("RP: Received invalid message 0x%04x length 0x%04x",
2354 header_type, header_len);
2355 mark_source_rp_bad(ms);
2356 goto out;
2357 }
2358
2359 if ((rp_cmd_args[header_type].len != -1 &&
2360 header_len != rp_cmd_args[header_type].len) ||
2361 header_len > sizeof(buf)) {
2362 error_report("RP: Received '%s' message (0x%04x) with"
2363 "incorrect length %d expecting %zu",
2364 rp_cmd_args[header_type].name, header_type, header_len,
2365 (size_t)rp_cmd_args[header_type].len);
2366 mark_source_rp_bad(ms);
2367 goto out;
2368 }
2369
2370
2371 res = qemu_get_buffer(rp, buf, header_len);
2372 if (res != header_len) {
2373 error_report("RP: Failed reading data for message 0x%04x"
2374 " read %d expected %d",
2375 header_type, res, header_len);
2376 mark_source_rp_bad(ms);
2377 goto out;
2378 }
2379
2380
2381 switch (header_type) {
2382 case MIG_RP_MSG_SHUT:
2383 sibling_error = ldl_be_p(buf);
2384 trace_source_return_path_thread_shut(sibling_error);
2385 if (sibling_error) {
2386 error_report("RP: Sibling indicated error %d", sibling_error);
2387 mark_source_rp_bad(ms);
2388 }
2389
2390
2391
2392
2393
2394 goto out;
2395
2396 case MIG_RP_MSG_PONG:
2397 tmp32 = ldl_be_p(buf);
2398 trace_source_return_path_thread_pong(tmp32);
2399 break;
2400
2401 case MIG_RP_MSG_REQ_PAGES:
2402 start = ldq_be_p(buf);
2403 len = ldl_be_p(buf + 8);
2404 migrate_handle_rp_req_pages(ms, NULL, start, len);
2405 break;
2406
2407 case MIG_RP_MSG_REQ_PAGES_ID:
2408 expected_len = 12 + 1;
2409
2410 if (header_len >= expected_len) {
2411 start = ldq_be_p(buf);
2412 len = ldl_be_p(buf + 8);
2413
2414 tmp32 = buf[12];
2415 buf[13 + tmp32] = '\0';
2416 expected_len += tmp32;
2417 }
2418 if (header_len != expected_len) {
2419 error_report("RP: Req_Page_id with length %d expecting %zd",
2420 header_len, expected_len);
2421 mark_source_rp_bad(ms);
2422 goto out;
2423 }
2424 migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len);
2425 break;
2426
2427 case MIG_RP_MSG_RECV_BITMAP:
2428 if (header_len < 1) {
2429 error_report("%s: missing block name", __func__);
2430 mark_source_rp_bad(ms);
2431 goto out;
2432 }
2433
2434 buf[buf[0] + 1] = '\0';
2435 if (migrate_handle_rp_recv_bitmap(ms, (char *)(buf + 1))) {
2436 mark_source_rp_bad(ms);
2437 goto out;
2438 }
2439 break;
2440
2441 case MIG_RP_MSG_RESUME_ACK:
2442 tmp32 = ldl_be_p(buf);
2443 if (migrate_handle_rp_resume_ack(ms, tmp32)) {
2444 mark_source_rp_bad(ms);
2445 goto out;
2446 }
2447 break;
2448
2449 default:
2450 break;
2451 }
2452 }
2453
2454out:
2455 res = qemu_file_get_error(rp);
2456 if (res) {
2457 if (res == -EIO) {
2458
2459
2460
2461
2462 if (postcopy_pause_return_path_thread(ms)) {
2463
2464 if (rp != ms->rp_state.from_dst_file) {
2465 qemu_fclose(rp);
2466 rp = ms->rp_state.from_dst_file;
2467 }
2468 ms->rp_state.error = false;
2469 goto retry;
2470 }
2471 }
2472
2473 trace_source_return_path_thread_bad_end();
2474 mark_source_rp_bad(ms);
2475 }
2476
2477 trace_source_return_path_thread_end();
2478 ms->rp_state.from_dst_file = NULL;
2479 qemu_fclose(rp);
2480 rcu_unregister_thread();
2481 return NULL;
2482}
2483
2484static int open_return_path_on_source(MigrationState *ms,
2485 bool create_thread)
2486{
2487
2488 ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file);
2489 if (!ms->rp_state.from_dst_file) {
2490 return -1;
2491 }
2492
2493 trace_open_return_path_on_source();
2494
2495 if (!create_thread) {
2496
2497 return 0;
2498 }
2499
2500 qemu_thread_create(&ms->rp_state.rp_thread, "return path",
2501 source_return_path_thread, ms, QEMU_THREAD_JOINABLE);
2502
2503 trace_open_return_path_on_source_continue();
2504
2505 return 0;
2506}
2507
2508
2509static int await_return_path_close_on_source(MigrationState *ms)
2510{
2511
2512
2513
2514
2515
2516 if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) {
2517
2518
2519
2520
2521 qemu_file_shutdown(ms->rp_state.from_dst_file);
2522 mark_source_rp_bad(ms);
2523 }
2524 trace_await_return_path_close_on_source_joining();
2525 qemu_thread_join(&ms->rp_state.rp_thread);
2526 trace_await_return_path_close_on_source_close();
2527 return ms->rp_state.error;
2528}
2529
2530
2531
2532
2533
2534static int postcopy_start(MigrationState *ms)
2535{
2536 int ret;
2537 QIOChannelBuffer *bioc;
2538 QEMUFile *fb;
2539 int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2540 int64_t bandwidth = migrate_max_postcopy_bandwidth();
2541 bool restart_block = false;
2542 int cur_state = MIGRATION_STATUS_ACTIVE;
2543 if (!migrate_pause_before_switchover()) {
2544 migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
2545 MIGRATION_STATUS_POSTCOPY_ACTIVE);
2546 }
2547
2548 trace_postcopy_start();
2549 qemu_mutex_lock_iothread();
2550 trace_postcopy_start_set_run();
2551
2552 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL);
2553 global_state_store();
2554 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
2555 if (ret < 0) {
2556 goto fail;
2557 }
2558
2559 ret = migration_maybe_pause(ms, &cur_state,
2560 MIGRATION_STATUS_POSTCOPY_ACTIVE);
2561 if (ret < 0) {
2562 goto fail;
2563 }
2564
2565 ret = bdrv_inactivate_all();
2566 if (ret < 0) {
2567 goto fail;
2568 }
2569 restart_block = true;
2570
2571
2572
2573
2574
2575 qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false);
2576
2577
2578
2579
2580
2581
2582
2583 if (migrate_postcopy_ram()) {
2584 if (ram_postcopy_send_discard_bitmap(ms)) {
2585 error_report("postcopy send discard bitmap failed");
2586 goto fail;
2587 }
2588 }
2589
2590
2591
2592
2593
2594
2595
2596 if (!bandwidth) {
2597 qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
2598 } else {
2599 qemu_file_set_rate_limit(ms->to_dst_file, bandwidth / XFER_LIMIT_RATIO);
2600 }
2601 if (migrate_postcopy_ram()) {
2602
2603 qemu_savevm_send_ping(ms->to_dst_file, 2);
2604 }
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617 bioc = qio_channel_buffer_new(4096);
2618 qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer");
2619 fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
2620 object_unref(OBJECT(bioc));
2621
2622
2623
2624
2625
2626 qemu_savevm_send_postcopy_listen(fb);
2627
2628 qemu_savevm_state_complete_precopy(fb, false, false);
2629 if (migrate_postcopy_ram()) {
2630 qemu_savevm_send_ping(fb, 3);
2631 }
2632
2633 qemu_savevm_send_postcopy_run(fb);
2634
2635
2636
2637
2638
2639
2640
2641 ret = qemu_file_get_error(ms->to_dst_file);
2642 if (ret) {
2643 error_report("postcopy_start: Migration stream errored (pre package)");
2644 goto fail_closefb;
2645 }
2646
2647 restart_block = false;
2648
2649
2650 if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) {
2651 goto fail_closefb;
2652 }
2653 qemu_fclose(fb);
2654
2655
2656
2657
2658
2659 ms->postcopy_after_devices = true;
2660 notifier_list_notify(&migration_state_notifiers, ms);
2661
2662 ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop;
2663
2664 qemu_mutex_unlock_iothread();
2665
2666 if (migrate_postcopy_ram()) {
2667
2668
2669
2670
2671 qemu_savevm_send_ping(ms->to_dst_file, 4);
2672 }
2673
2674 if (migrate_release_ram()) {
2675 ram_postcopy_migrated_memory_release(ms);
2676 }
2677
2678 ret = qemu_file_get_error(ms->to_dst_file);
2679 if (ret) {
2680 error_report("postcopy_start: Migration stream errored");
2681 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
2682 MIGRATION_STATUS_FAILED);
2683 }
2684
2685 return ret;
2686
2687fail_closefb:
2688 qemu_fclose(fb);
2689fail:
2690 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
2691 MIGRATION_STATUS_FAILED);
2692 if (restart_block) {
2693
2694
2695
2696 Error *local_err = NULL;
2697
2698 bdrv_invalidate_cache_all(&local_err);
2699 if (local_err) {
2700 error_report_err(local_err);
2701 }
2702 }
2703 qemu_mutex_unlock_iothread();
2704 return -1;
2705}
2706
2707
2708
2709
2710
2711
2712static int migration_maybe_pause(MigrationState *s,
2713 int *current_active_state,
2714 int new_state)
2715{
2716 if (!migrate_pause_before_switchover()) {
2717 return 0;
2718 }
2719
2720
2721
2722
2723
2724
2725
2726 while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) {
2727
2728 }
2729
2730 qemu_mutex_unlock_iothread();
2731 migrate_set_state(&s->state, *current_active_state,
2732 MIGRATION_STATUS_PRE_SWITCHOVER);
2733 qemu_sem_wait(&s->pause_sem);
2734 migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
2735 new_state);
2736 *current_active_state = new_state;
2737 qemu_mutex_lock_iothread();
2738
2739 return s->state == new_state ? 0 : -EINVAL;
2740}
2741
2742
2743
2744
2745
2746
2747
2748static void migration_completion(MigrationState *s)
2749{
2750 int ret;
2751 int current_active_state = s->state;
2752
2753 if (s->state == MIGRATION_STATUS_ACTIVE) {
2754 qemu_mutex_lock_iothread();
2755 s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2756 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL);
2757 s->vm_was_running = runstate_is_running();
2758 ret = global_state_store();
2759
2760 if (!ret) {
2761 bool inactivate = !migrate_colo_enabled();
2762 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
2763 if (ret >= 0) {
2764 ret = migration_maybe_pause(s, ¤t_active_state,
2765 MIGRATION_STATUS_DEVICE);
2766 }
2767 if (ret >= 0) {
2768 qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
2769 ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
2770 inactivate);
2771 }
2772 if (inactivate && ret >= 0) {
2773 s->block_inactive = true;
2774 }
2775 }
2776 qemu_mutex_unlock_iothread();
2777
2778 if (ret < 0) {
2779 goto fail;
2780 }
2781 } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
2782 trace_migration_completion_postcopy_end();
2783
2784 qemu_savevm_state_complete_postcopy(s->to_dst_file);
2785 trace_migration_completion_postcopy_end_after_complete();
2786 }
2787
2788
2789
2790
2791
2792
2793
2794 if (s->rp_state.from_dst_file) {
2795 int rp_error;
2796 trace_migration_return_path_end_before();
2797 rp_error = await_return_path_close_on_source(s);
2798 trace_migration_return_path_end_after(rp_error);
2799 if (rp_error) {
2800 goto fail_invalidate;
2801 }
2802 }
2803
2804 if (qemu_file_get_error(s->to_dst_file)) {
2805 trace_migration_completion_file_err();
2806 goto fail_invalidate;
2807 }
2808
2809 if (!migrate_colo_enabled()) {
2810 migrate_set_state(&s->state, current_active_state,
2811 MIGRATION_STATUS_COMPLETED);
2812 }
2813
2814 return;
2815
2816fail_invalidate:
2817
2818
2819
2820 if (s->state == MIGRATION_STATUS_ACTIVE ||
2821 s->state == MIGRATION_STATUS_DEVICE) {
2822 Error *local_err = NULL;
2823
2824 qemu_mutex_lock_iothread();
2825 bdrv_invalidate_cache_all(&local_err);
2826 if (local_err) {
2827 error_report_err(local_err);
2828 } else {
2829 s->block_inactive = false;
2830 }
2831 qemu_mutex_unlock_iothread();
2832 }
2833
2834fail:
2835 migrate_set_state(&s->state, current_active_state,
2836 MIGRATION_STATUS_FAILED);
2837}
2838
2839bool migrate_colo_enabled(void)
2840{
2841 MigrationState *s = migrate_get_current();
2842 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO];
2843}
2844
2845typedef enum MigThrError {
2846
2847 MIG_THR_ERR_NONE = 0,
2848
2849 MIG_THR_ERR_RECOVERED = 1,
2850
2851 MIG_THR_ERR_FATAL = 2,
2852} MigThrError;
2853
2854static int postcopy_resume_handshake(MigrationState *s)
2855{
2856 qemu_savevm_send_postcopy_resume(s->to_dst_file);
2857
2858 while (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) {
2859 qemu_sem_wait(&s->rp_state.rp_sem);
2860 }
2861
2862 if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
2863 return 0;
2864 }
2865
2866 return -1;
2867}
2868
2869
2870static int postcopy_do_resume(MigrationState *s)
2871{
2872 int ret;
2873
2874
2875
2876
2877
2878 ret = qemu_savevm_state_resume_prepare(s);
2879 if (ret) {
2880 error_report("%s: resume_prepare() failure detected: %d",
2881 __func__, ret);
2882 return ret;
2883 }
2884
2885
2886
2887
2888
2889 ret = postcopy_resume_handshake(s);
2890 if (ret) {
2891 error_report("%s: handshake failed: %d", __func__, ret);
2892 return ret;
2893 }
2894
2895 return 0;
2896}
2897
2898
2899
2900
2901
2902
2903static MigThrError postcopy_pause(MigrationState *s)
2904{
2905 assert(s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
2906
2907 while (true) {
2908 QEMUFile *file;
2909
2910 migrate_set_state(&s->state, s->state,
2911 MIGRATION_STATUS_POSTCOPY_PAUSED);
2912
2913
2914 assert(s->to_dst_file);
2915 qemu_mutex_lock(&s->qemu_file_lock);
2916 file = s->to_dst_file;
2917 s->to_dst_file = NULL;
2918 qemu_mutex_unlock(&s->qemu_file_lock);
2919
2920 qemu_file_shutdown(file);
2921 qemu_fclose(file);
2922
2923 error_report("Detected IO failure for postcopy. "
2924 "Migration paused.");
2925
2926
2927
2928
2929
2930 while (s->state == MIGRATION_STATUS_POSTCOPY_PAUSED) {
2931 qemu_sem_wait(&s->postcopy_pause_sem);
2932 }
2933
2934 if (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) {
2935
2936
2937
2938
2939
2940
2941 qemu_sem_post(&s->postcopy_pause_rp_sem);
2942
2943
2944 if (postcopy_do_resume(s) == 0) {
2945
2946 trace_postcopy_pause_continued();
2947 return MIG_THR_ERR_RECOVERED;
2948 } else {
2949
2950
2951
2952
2953
2954 continue;
2955 }
2956 } else {
2957
2958 return MIG_THR_ERR_FATAL;
2959 }
2960 }
2961}
2962
2963static MigThrError migration_detect_error(MigrationState *s)
2964{
2965 int ret;
2966 int state = s->state;
2967
2968 if (state == MIGRATION_STATUS_CANCELLING ||
2969 state == MIGRATION_STATUS_CANCELLED) {
2970
2971 return MIG_THR_ERR_FATAL;
2972 }
2973
2974
2975 ret = qemu_file_get_error(s->to_dst_file);
2976
2977 if (!ret) {
2978
2979 return MIG_THR_ERR_NONE;
2980 }
2981
2982 if (state == MIGRATION_STATUS_POSTCOPY_ACTIVE && ret == -EIO) {
2983
2984
2985
2986
2987
2988 return postcopy_pause(s);
2989 } else {
2990
2991
2992
2993
2994 migrate_set_state(&s->state, state, MIGRATION_STATUS_FAILED);
2995 trace_migration_thread_file_err();
2996
2997
2998 return MIG_THR_ERR_FATAL;
2999 }
3000}
3001
3002
3003static uint64_t migration_total_bytes(MigrationState *s)
3004{
3005 return qemu_ftell(s->to_dst_file) + ram_counters.multifd_bytes;
3006}
3007
3008static void migration_calculate_complete(MigrationState *s)
3009{
3010 uint64_t bytes = migration_total_bytes(s);
3011 int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
3012 int64_t transfer_time;
3013
3014 s->total_time = end_time - s->start_time;
3015 if (!s->downtime) {
3016
3017
3018
3019
3020 s->downtime = end_time - s->downtime_start;
3021 }
3022
3023 transfer_time = s->total_time - s->setup_time;
3024 if (transfer_time) {
3025 s->mbps = ((double) bytes * 8.0) / transfer_time / 1000;
3026 }
3027}
3028
3029static void migration_update_counters(MigrationState *s,
3030 int64_t current_time)
3031{
3032 uint64_t transferred, transferred_pages, time_spent;
3033 uint64_t current_bytes;
3034 double bandwidth;
3035
3036 if (current_time < s->iteration_start_time + BUFFER_DELAY) {
3037 return;
3038 }
3039
3040 current_bytes = migration_total_bytes(s);
3041 transferred = current_bytes - s->iteration_initial_bytes;
3042 time_spent = current_time - s->iteration_start_time;
3043 bandwidth = (double)transferred / time_spent;
3044 s->threshold_size = bandwidth * s->parameters.downtime_limit;
3045
3046 s->mbps = (((double) transferred * 8.0) /
3047 ((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
3048
3049 transferred_pages = ram_get_total_transferred_pages() -
3050 s->iteration_initial_pages;
3051 s->pages_per_second = (double) transferred_pages /
3052 (((double) time_spent / 1000.0));
3053
3054
3055
3056
3057
3058 if (ram_counters.dirty_pages_rate && transferred > 10000) {
3059 s->expected_downtime = ram_counters.remaining / bandwidth;
3060 }
3061
3062 qemu_file_reset_rate_limit(s->to_dst_file);
3063
3064 s->iteration_start_time = current_time;
3065 s->iteration_initial_bytes = current_bytes;
3066 s->iteration_initial_pages = ram_get_total_transferred_pages();
3067
3068 trace_migrate_transferred(transferred, time_spent,
3069 bandwidth, s->threshold_size);
3070}
3071
3072
3073typedef enum {
3074 MIG_ITERATE_RESUME,
3075 MIG_ITERATE_SKIP,
3076 MIG_ITERATE_BREAK,
3077} MigIterateState;
3078
3079
3080
3081
3082
3083static MigIterateState migration_iteration_run(MigrationState *s)
3084{
3085 uint64_t pending_size, pend_pre, pend_compat, pend_post;
3086 bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE;
3087
3088 qemu_savevm_state_pending(s->to_dst_file, s->threshold_size, &pend_pre,
3089 &pend_compat, &pend_post);
3090 pending_size = pend_pre + pend_compat + pend_post;
3091
3092 trace_migrate_pending(pending_size, s->threshold_size,
3093 pend_pre, pend_compat, pend_post);
3094
3095 if (pending_size && pending_size >= s->threshold_size) {
3096
3097 if (migrate_postcopy() && !in_postcopy &&
3098 pend_pre <= s->threshold_size &&
3099 atomic_read(&s->start_postcopy)) {
3100 if (postcopy_start(s)) {
3101 error_report("%s: postcopy failed to start", __func__);
3102 }
3103 return MIG_ITERATE_SKIP;
3104 }
3105
3106 qemu_savevm_state_iterate(s->to_dst_file,
3107 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
3108 } else {
3109 trace_migration_thread_low_pending(pending_size);
3110 migration_completion(s);
3111 return MIG_ITERATE_BREAK;
3112 }
3113
3114 return MIG_ITERATE_RESUME;
3115}
3116
3117static void migration_iteration_finish(MigrationState *s)
3118{
3119
3120 cpu_throttle_stop();
3121
3122 qemu_mutex_lock_iothread();
3123 switch (s->state) {
3124 case MIGRATION_STATUS_COMPLETED:
3125 migration_calculate_complete(s);
3126 runstate_set(RUN_STATE_POSTMIGRATE);
3127 break;
3128
3129 case MIGRATION_STATUS_ACTIVE:
3130
3131
3132
3133
3134 if (!migrate_colo_enabled()) {
3135 error_report("%s: critical error: calling COLO code without "
3136 "COLO enabled", __func__);
3137 }
3138 migrate_start_colo_process(s);
3139
3140
3141
3142
3143 s->vm_was_running = true;
3144
3145 case MIGRATION_STATUS_FAILED:
3146 case MIGRATION_STATUS_CANCELLED:
3147 case MIGRATION_STATUS_CANCELLING:
3148 if (s->vm_was_running) {
3149 vm_start();
3150 } else {
3151 if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
3152 runstate_set(RUN_STATE_POSTMIGRATE);
3153 }
3154 }
3155 break;
3156
3157 default:
3158
3159 error_report("%s: Unknown ending state %d", __func__, s->state);
3160 break;
3161 }
3162 migrate_fd_cleanup_schedule(s);
3163 qemu_mutex_unlock_iothread();
3164}
3165
3166void migration_make_urgent_request(void)
3167{
3168 qemu_sem_post(&migrate_get_current()->rate_limit_sem);
3169}
3170
3171void migration_consume_urgent_request(void)
3172{
3173 qemu_sem_wait(&migrate_get_current()->rate_limit_sem);
3174}
3175
3176
3177
3178
3179
3180static void *migration_thread(void *opaque)
3181{
3182 MigrationState *s = opaque;
3183 int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
3184 MigThrError thr_error;
3185 bool urgent = false;
3186
3187 rcu_register_thread();
3188
3189 object_ref(OBJECT(s));
3190 s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
3191
3192 qemu_savevm_state_header(s->to_dst_file);
3193
3194
3195
3196
3197
3198 if (s->rp_state.from_dst_file) {
3199
3200 qemu_savevm_send_open_return_path(s->to_dst_file);
3201
3202
3203 qemu_savevm_send_ping(s->to_dst_file, 1);
3204 }
3205
3206 if (migrate_postcopy()) {
3207
3208
3209
3210
3211
3212 qemu_savevm_send_postcopy_advise(s->to_dst_file);
3213 }
3214
3215 if (migrate_colo_enabled()) {
3216
3217 qemu_savevm_send_colo_enable(s->to_dst_file);
3218 }
3219
3220 qemu_savevm_state_setup(s->to_dst_file);
3221
3222 s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
3223 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
3224 MIGRATION_STATUS_ACTIVE);
3225
3226 trace_migration_thread_setup_complete();
3227
3228 while (s->state == MIGRATION_STATUS_ACTIVE ||
3229 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
3230 int64_t current_time;
3231
3232 if (urgent || !qemu_file_rate_limit(s->to_dst_file)) {
3233 MigIterateState iter_state = migration_iteration_run(s);
3234 if (iter_state == MIG_ITERATE_SKIP) {
3235 continue;
3236 } else if (iter_state == MIG_ITERATE_BREAK) {
3237 break;
3238 }
3239 }
3240
3241
3242
3243
3244
3245 thr_error = migration_detect_error(s);
3246 if (thr_error == MIG_THR_ERR_FATAL) {
3247
3248 break;
3249 } else if (thr_error == MIG_THR_ERR_RECOVERED) {
3250
3251
3252
3253
3254
3255 s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
3256 s->iteration_initial_bytes = 0;
3257 }
3258
3259 current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
3260
3261 migration_update_counters(s, current_time);
3262
3263 urgent = false;
3264 if (qemu_file_rate_limit(s->to_dst_file)) {
3265
3266
3267
3268 int ms = s->iteration_start_time + BUFFER_DELAY - current_time;
3269 trace_migration_thread_ratelimit_pre(ms);
3270 if (qemu_sem_timedwait(&s->rate_limit_sem, ms) == 0) {
3271
3272
3273
3274
3275
3276
3277 qemu_sem_post(&s->rate_limit_sem);
3278 urgent = true;
3279 }
3280 trace_migration_thread_ratelimit_post(urgent);
3281 }
3282 }
3283
3284 trace_migration_thread_after_loop();
3285 migration_iteration_finish(s);
3286 object_unref(OBJECT(s));
3287 rcu_unregister_thread();
3288 return NULL;
3289}
3290
3291void migrate_fd_connect(MigrationState *s, Error *error_in)
3292{
3293 int64_t rate_limit;
3294 bool resume = s->state == MIGRATION_STATUS_POSTCOPY_PAUSED;
3295
3296 s->expected_downtime = s->parameters.downtime_limit;
3297 s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup_bh, s);
3298 if (error_in) {
3299 migrate_fd_error(s, error_in);
3300 migrate_fd_cleanup(s);
3301 return;
3302 }
3303
3304 if (resume) {
3305
3306 rate_limit = INT64_MAX;
3307 } else {
3308
3309 rate_limit = s->parameters.max_bandwidth / XFER_LIMIT_RATIO;
3310
3311
3312 notifier_list_notify(&migration_state_notifiers, s);
3313 }
3314
3315 qemu_file_set_rate_limit(s->to_dst_file, rate_limit);
3316 qemu_file_set_blocking(s->to_dst_file, true);
3317
3318
3319
3320
3321
3322
3323 if (migrate_postcopy_ram() || migrate_use_return_path()) {
3324 if (open_return_path_on_source(s, !resume)) {
3325 error_report("Unable to open return-path for postcopy");
3326 migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED);
3327 migrate_fd_cleanup(s);
3328 return;
3329 }
3330 }
3331
3332 if (resume) {
3333
3334 migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_PAUSED,
3335 MIGRATION_STATUS_POSTCOPY_RECOVER);
3336 qemu_sem_post(&s->postcopy_pause_sem);
3337 return;
3338 }
3339
3340 if (multifd_save_setup() != 0) {
3341 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
3342 MIGRATION_STATUS_FAILED);
3343 migrate_fd_cleanup(s);
3344 return;
3345 }
3346 qemu_thread_create(&s->thread, "live_migration", migration_thread, s,
3347 QEMU_THREAD_JOINABLE);
3348 s->migration_thread_running = true;
3349}
3350
3351void migration_global_dump(Monitor *mon)
3352{
3353 MigrationState *ms = migrate_get_current();
3354
3355 monitor_printf(mon, "globals:\n");
3356 monitor_printf(mon, "store-global-state: %s\n",
3357 ms->store_global_state ? "on" : "off");
3358 monitor_printf(mon, "only-migratable: %s\n",
3359 only_migratable ? "on" : "off");
3360 monitor_printf(mon, "send-configuration: %s\n",
3361 ms->send_configuration ? "on" : "off");
3362 monitor_printf(mon, "send-section-footer: %s\n",
3363 ms->send_section_footer ? "on" : "off");
3364 monitor_printf(mon, "decompress-error-check: %s\n",
3365 ms->decompress_error_check ? "on" : "off");
3366}
3367
3368#define DEFINE_PROP_MIG_CAP(name, x) \
3369 DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false)
3370
3371static Property migration_properties[] = {
3372 DEFINE_PROP_BOOL("store-global-state", MigrationState,
3373 store_global_state, true),
3374 DEFINE_PROP_BOOL("send-configuration", MigrationState,
3375 send_configuration, true),
3376 DEFINE_PROP_BOOL("send-section-footer", MigrationState,
3377 send_section_footer, true),
3378 DEFINE_PROP_BOOL("decompress-error-check", MigrationState,
3379 decompress_error_check, true),
3380
3381
3382 DEFINE_PROP_UINT8("x-compress-level", MigrationState,
3383 parameters.compress_level,
3384 DEFAULT_MIGRATE_COMPRESS_LEVEL),
3385 DEFINE_PROP_UINT8("x-compress-threads", MigrationState,
3386 parameters.compress_threads,
3387 DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
3388 DEFINE_PROP_BOOL("x-compress-wait-thread", MigrationState,
3389 parameters.compress_wait_thread, true),
3390 DEFINE_PROP_UINT8("x-decompress-threads", MigrationState,
3391 parameters.decompress_threads,
3392 DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
3393 DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState,
3394 parameters.cpu_throttle_initial,
3395 DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
3396 DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
3397 parameters.cpu_throttle_increment,
3398 DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
3399 DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
3400 parameters.max_bandwidth, MAX_THROTTLE),
3401 DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
3402 parameters.downtime_limit,
3403 DEFAULT_MIGRATE_SET_DOWNTIME),
3404 DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
3405 parameters.x_checkpoint_delay,
3406 DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
3407 DEFINE_PROP_UINT8("multifd-channels", MigrationState,
3408 parameters.multifd_channels,
3409 DEFAULT_MIGRATE_MULTIFD_CHANNELS),
3410 DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
3411 parameters.xbzrle_cache_size,
3412 DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
3413 DEFINE_PROP_SIZE("max-postcopy-bandwidth", MigrationState,
3414 parameters.max_postcopy_bandwidth,
3415 DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH),
3416 DEFINE_PROP_UINT8("max-cpu-throttle", MigrationState,
3417 parameters.max_cpu_throttle,
3418 DEFAULT_MIGRATE_MAX_CPU_THROTTLE),
3419 DEFINE_PROP_SIZE("announce-initial", MigrationState,
3420 parameters.announce_initial,
3421 DEFAULT_MIGRATE_ANNOUNCE_INITIAL),
3422 DEFINE_PROP_SIZE("announce-max", MigrationState,
3423 parameters.announce_max,
3424 DEFAULT_MIGRATE_ANNOUNCE_MAX),
3425 DEFINE_PROP_SIZE("announce-rounds", MigrationState,
3426 parameters.announce_rounds,
3427 DEFAULT_MIGRATE_ANNOUNCE_ROUNDS),
3428 DEFINE_PROP_SIZE("announce-step", MigrationState,
3429 parameters.announce_step,
3430 DEFAULT_MIGRATE_ANNOUNCE_STEP),
3431
3432
3433 DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
3434 DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
3435 DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
3436 DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
3437 DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
3438 DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
3439 DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
3440 DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
3441 DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
3442 DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
3443 DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
3444 DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_MULTIFD),
3445
3446 DEFINE_PROP_END_OF_LIST(),
3447};
3448
3449static void migration_class_init(ObjectClass *klass, void *data)
3450{
3451 DeviceClass *dc = DEVICE_CLASS(klass);
3452
3453 dc->user_creatable = false;
3454 dc->props = migration_properties;
3455}
3456
3457static void migration_instance_finalize(Object *obj)
3458{
3459 MigrationState *ms = MIGRATION_OBJ(obj);
3460 MigrationParameters *params = &ms->parameters;
3461
3462 qemu_mutex_destroy(&ms->error_mutex);
3463 qemu_mutex_destroy(&ms->qemu_file_lock);
3464 g_free(params->tls_hostname);
3465 g_free(params->tls_creds);
3466 qemu_sem_destroy(&ms->rate_limit_sem);
3467 qemu_sem_destroy(&ms->pause_sem);
3468 qemu_sem_destroy(&ms->postcopy_pause_sem);
3469 qemu_sem_destroy(&ms->postcopy_pause_rp_sem);
3470 qemu_sem_destroy(&ms->rp_state.rp_sem);
3471 error_free(ms->error);
3472}
3473
3474static void migration_instance_init(Object *obj)
3475{
3476 MigrationState *ms = MIGRATION_OBJ(obj);
3477 MigrationParameters *params = &ms->parameters;
3478
3479 ms->state = MIGRATION_STATUS_NONE;
3480 ms->mbps = -1;
3481 ms->pages_per_second = -1;
3482 qemu_sem_init(&ms->pause_sem, 0);
3483 qemu_mutex_init(&ms->error_mutex);
3484
3485 params->tls_hostname = g_strdup("");
3486 params->tls_creds = g_strdup("");
3487
3488
3489 params->has_compress_level = true;
3490 params->has_compress_threads = true;
3491 params->has_decompress_threads = true;
3492 params->has_cpu_throttle_initial = true;
3493 params->has_cpu_throttle_increment = true;
3494 params->has_max_bandwidth = true;
3495 params->has_downtime_limit = true;
3496 params->has_x_checkpoint_delay = true;
3497 params->has_block_incremental = true;
3498 params->has_multifd_channels = true;
3499 params->has_xbzrle_cache_size = true;
3500 params->has_max_postcopy_bandwidth = true;
3501 params->has_max_cpu_throttle = true;
3502 params->has_announce_initial = true;
3503 params->has_announce_max = true;
3504 params->has_announce_rounds = true;
3505 params->has_announce_step = true;
3506
3507 qemu_sem_init(&ms->postcopy_pause_sem, 0);
3508 qemu_sem_init(&ms->postcopy_pause_rp_sem, 0);
3509 qemu_sem_init(&ms->rp_state.rp_sem, 0);
3510 qemu_sem_init(&ms->rate_limit_sem, 0);
3511 qemu_mutex_init(&ms->qemu_file_lock);
3512}
3513
3514
3515
3516
3517
3518static bool migration_object_check(MigrationState *ms, Error **errp)
3519{
3520 MigrationCapabilityStatusList *head = NULL;
3521
3522 bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret;
3523 int i;
3524
3525 if (!migrate_params_check(&ms->parameters, errp)) {
3526 return false;
3527 }
3528
3529 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
3530 if (ms->enabled_capabilities[i]) {
3531 head = migrate_cap_add(head, i, true);
3532 }
3533 }
3534
3535 ret = migrate_caps_check(cap_list, head, errp);
3536
3537
3538 qapi_free_MigrationCapabilityStatusList(head);
3539
3540 return ret;
3541}
3542
3543static const TypeInfo migration_type = {
3544 .name = TYPE_MIGRATION,
3545
3546
3547
3548
3549
3550
3551
3552
3553 .parent = TYPE_DEVICE,
3554 .class_init = migration_class_init,
3555 .class_size = sizeof(MigrationClass),
3556 .instance_size = sizeof(MigrationState),
3557 .instance_init = migration_instance_init,
3558 .instance_finalize = migration_instance_finalize,
3559};
3560
3561static void register_migration_types(void)
3562{
3563 type_register_static(&migration_type);
3564}
3565
3566type_init(register_migration_types);
3567