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13#include "qemu/osdep.h"
14#include "sysemu/sysemu.h"
15#include "qapi/error.h"
16#include "qapi/qapi-commands-migration.h"
17#include "qemu-file-channel.h"
18#include "migration.h"
19#include "qemu-file.h"
20#include "savevm.h"
21#include "migration/colo.h"
22#include "block.h"
23#include "io/channel-buffer.h"
24#include "trace.h"
25#include "qemu/error-report.h"
26#include "qemu/main-loop.h"
27#include "qemu/rcu.h"
28#include "migration/failover.h"
29#include "migration/ram.h"
30#ifdef CONFIG_REPLICATION
31#include "replication.h"
32#endif
33#include "net/colo-compare.h"
34#include "net/colo.h"
35#include "block/block.h"
36#include "qapi/qapi-events-migration.h"
37#include "qapi/qmp/qerror.h"
38#include "sysemu/cpus.h"
39#include "sysemu/runstate.h"
40#include "net/filter.h"
41
42static bool vmstate_loading;
43static Notifier packets_compare_notifier;
44
45
46static COLOMode last_colo_mode;
47
48#define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024)
49
50bool migration_in_colo_state(void)
51{
52 MigrationState *s = migrate_get_current();
53
54 return (s->state == MIGRATION_STATUS_COLO);
55}
56
57bool migration_incoming_in_colo_state(void)
58{
59 MigrationIncomingState *mis = migration_incoming_get_current();
60
61 return mis && (mis->state == MIGRATION_STATUS_COLO);
62}
63
64static bool colo_runstate_is_stopped(void)
65{
66 return runstate_check(RUN_STATE_COLO) || !runstate_is_running();
67}
68
69static void secondary_vm_do_failover(void)
70{
71
72#ifdef CONFIG_REPLICATION
73 int old_state;
74 MigrationIncomingState *mis = migration_incoming_get_current();
75 Error *local_err = NULL;
76
77
78
79
80 if (vmstate_loading) {
81 old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
82 FAILOVER_STATUS_RELAUNCH);
83 if (old_state != FAILOVER_STATUS_ACTIVE) {
84 error_report("Unknown error while do failover for secondary VM,"
85 "old_state: %s", FailoverStatus_str(old_state));
86 }
87 return;
88 }
89
90 migrate_set_state(&mis->state, MIGRATION_STATUS_COLO,
91 MIGRATION_STATUS_COMPLETED);
92
93 replication_stop_all(true, &local_err);
94 if (local_err) {
95 error_report_err(local_err);
96 local_err = NULL;
97 }
98
99
100 colo_notify_filters_event(COLO_EVENT_FAILOVER, &local_err);
101 if (local_err) {
102 error_report_err(local_err);
103 }
104
105 if (!autostart) {
106 error_report("\"-S\" qemu option will be ignored in secondary side");
107
108 autostart = true;
109 }
110
111
112
113
114
115
116 if (mis->from_src_file) {
117 qemu_file_shutdown(mis->from_src_file);
118 }
119 if (mis->to_src_file) {
120 qemu_file_shutdown(mis->to_src_file);
121 }
122
123 old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
124 FAILOVER_STATUS_COMPLETED);
125 if (old_state != FAILOVER_STATUS_ACTIVE) {
126 error_report("Incorrect state (%s) while doing failover for "
127 "secondary VM", FailoverStatus_str(old_state));
128 return;
129 }
130
131 qemu_sem_post(&mis->colo_incoming_sem);
132
133
134 if (mis->migration_incoming_co) {
135 qemu_coroutine_enter(mis->migration_incoming_co);
136 }
137#else
138 abort();
139#endif
140}
141
142static void primary_vm_do_failover(void)
143{
144#ifdef CONFIG_REPLICATION
145 MigrationState *s = migrate_get_current();
146 int old_state;
147 Error *local_err = NULL;
148
149 migrate_set_state(&s->state, MIGRATION_STATUS_COLO,
150 MIGRATION_STATUS_COMPLETED);
151
152
153
154
155 colo_checkpoint_notify(migrate_get_current());
156
157
158
159
160
161
162 if (s->to_dst_file) {
163 qemu_file_shutdown(s->to_dst_file);
164 }
165 if (s->rp_state.from_dst_file) {
166 qemu_file_shutdown(s->rp_state.from_dst_file);
167 }
168
169 old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
170 FAILOVER_STATUS_COMPLETED);
171 if (old_state != FAILOVER_STATUS_ACTIVE) {
172 error_report("Incorrect state (%s) while doing failover for Primary VM",
173 FailoverStatus_str(old_state));
174 return;
175 }
176
177 replication_stop_all(true, &local_err);
178 if (local_err) {
179 error_report_err(local_err);
180 local_err = NULL;
181 }
182
183
184 qemu_sem_post(&s->colo_exit_sem);
185#else
186 abort();
187#endif
188}
189
190COLOMode get_colo_mode(void)
191{
192 if (migration_in_colo_state()) {
193 return COLO_MODE_PRIMARY;
194 } else if (migration_incoming_in_colo_state()) {
195 return COLO_MODE_SECONDARY;
196 } else {
197 return COLO_MODE_NONE;
198 }
199}
200
201void colo_do_failover(void)
202{
203
204 if (!colo_runstate_is_stopped()) {
205 vm_stop_force_state(RUN_STATE_COLO);
206 }
207
208 switch (get_colo_mode()) {
209 case COLO_MODE_PRIMARY:
210 primary_vm_do_failover();
211 break;
212 case COLO_MODE_SECONDARY:
213 secondary_vm_do_failover();
214 break;
215 default:
216 error_report("colo_do_failover failed because the colo mode"
217 " could not be obtained");
218 }
219}
220
221#ifdef CONFIG_REPLICATION
222void qmp_xen_set_replication(bool enable, bool primary,
223 bool has_failover, bool failover,
224 Error **errp)
225{
226 ReplicationMode mode = primary ?
227 REPLICATION_MODE_PRIMARY :
228 REPLICATION_MODE_SECONDARY;
229
230 if (has_failover && enable) {
231 error_setg(errp, "Parameter 'failover' is only for"
232 " stopping replication");
233 return;
234 }
235
236 if (enable) {
237 replication_start_all(mode, errp);
238 } else {
239 if (!has_failover) {
240 failover = NULL;
241 }
242 replication_stop_all(failover, failover ? NULL : errp);
243 }
244}
245
246ReplicationStatus *qmp_query_xen_replication_status(Error **errp)
247{
248 Error *err = NULL;
249 ReplicationStatus *s = g_new0(ReplicationStatus, 1);
250
251 replication_get_error_all(&err);
252 if (err) {
253 s->error = true;
254 s->has_desc = true;
255 s->desc = g_strdup(error_get_pretty(err));
256 } else {
257 s->error = false;
258 }
259
260 error_free(err);
261 return s;
262}
263
264void qmp_xen_colo_do_checkpoint(Error **errp)
265{
266 Error *err = NULL;
267
268 replication_do_checkpoint_all(&err);
269 if (err) {
270 error_propagate(errp, err);
271 return;
272 }
273
274 colo_notify_filters_event(COLO_EVENT_CHECKPOINT, errp);
275}
276#endif
277
278COLOStatus *qmp_query_colo_status(Error **errp)
279{
280 COLOStatus *s = g_new0(COLOStatus, 1);
281
282 s->mode = get_colo_mode();
283 s->last_mode = last_colo_mode;
284
285 switch (failover_get_state()) {
286 case FAILOVER_STATUS_NONE:
287 s->reason = COLO_EXIT_REASON_NONE;
288 break;
289 case FAILOVER_STATUS_COMPLETED:
290 s->reason = COLO_EXIT_REASON_REQUEST;
291 break;
292 default:
293 if (migration_in_colo_state()) {
294 s->reason = COLO_EXIT_REASON_PROCESSING;
295 } else {
296 s->reason = COLO_EXIT_REASON_ERROR;
297 }
298 }
299
300 return s;
301}
302
303static void colo_send_message(QEMUFile *f, COLOMessage msg,
304 Error **errp)
305{
306 int ret;
307
308 if (msg >= COLO_MESSAGE__MAX) {
309 error_setg(errp, "%s: Invalid message", __func__);
310 return;
311 }
312 qemu_put_be32(f, msg);
313 qemu_fflush(f);
314
315 ret = qemu_file_get_error(f);
316 if (ret < 0) {
317 error_setg_errno(errp, -ret, "Can't send COLO message");
318 }
319 trace_colo_send_message(COLOMessage_str(msg));
320}
321
322static void colo_send_message_value(QEMUFile *f, COLOMessage msg,
323 uint64_t value, Error **errp)
324{
325 Error *local_err = NULL;
326 int ret;
327
328 colo_send_message(f, msg, &local_err);
329 if (local_err) {
330 error_propagate(errp, local_err);
331 return;
332 }
333 qemu_put_be64(f, value);
334 qemu_fflush(f);
335
336 ret = qemu_file_get_error(f);
337 if (ret < 0) {
338 error_setg_errno(errp, -ret, "Failed to send value for message:%s",
339 COLOMessage_str(msg));
340 }
341}
342
343static COLOMessage colo_receive_message(QEMUFile *f, Error **errp)
344{
345 COLOMessage msg;
346 int ret;
347
348 msg = qemu_get_be32(f);
349 ret = qemu_file_get_error(f);
350 if (ret < 0) {
351 error_setg_errno(errp, -ret, "Can't receive COLO message");
352 return msg;
353 }
354 if (msg >= COLO_MESSAGE__MAX) {
355 error_setg(errp, "%s: Invalid message", __func__);
356 return msg;
357 }
358 trace_colo_receive_message(COLOMessage_str(msg));
359 return msg;
360}
361
362static void colo_receive_check_message(QEMUFile *f, COLOMessage expect_msg,
363 Error **errp)
364{
365 COLOMessage msg;
366 Error *local_err = NULL;
367
368 msg = colo_receive_message(f, &local_err);
369 if (local_err) {
370 error_propagate(errp, local_err);
371 return;
372 }
373 if (msg != expect_msg) {
374 error_setg(errp, "Unexpected COLO message %d, expected %d",
375 msg, expect_msg);
376 }
377}
378
379static uint64_t colo_receive_message_value(QEMUFile *f, uint32_t expect_msg,
380 Error **errp)
381{
382 Error *local_err = NULL;
383 uint64_t value;
384 int ret;
385
386 colo_receive_check_message(f, expect_msg, &local_err);
387 if (local_err) {
388 error_propagate(errp, local_err);
389 return 0;
390 }
391
392 value = qemu_get_be64(f);
393 ret = qemu_file_get_error(f);
394 if (ret < 0) {
395 error_setg_errno(errp, -ret, "Failed to get value for COLO message: %s",
396 COLOMessage_str(expect_msg));
397 }
398 return value;
399}
400
401static int colo_do_checkpoint_transaction(MigrationState *s,
402 QIOChannelBuffer *bioc,
403 QEMUFile *fb)
404{
405 Error *local_err = NULL;
406 int ret = -1;
407
408 colo_send_message(s->to_dst_file, COLO_MESSAGE_CHECKPOINT_REQUEST,
409 &local_err);
410 if (local_err) {
411 goto out;
412 }
413
414 colo_receive_check_message(s->rp_state.from_dst_file,
415 COLO_MESSAGE_CHECKPOINT_REPLY, &local_err);
416 if (local_err) {
417 goto out;
418 }
419
420 qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
421 bioc->usage = 0;
422
423 qemu_mutex_lock_iothread();
424 if (failover_get_state() != FAILOVER_STATUS_NONE) {
425 qemu_mutex_unlock_iothread();
426 goto out;
427 }
428 vm_stop_force_state(RUN_STATE_COLO);
429 qemu_mutex_unlock_iothread();
430 trace_colo_vm_state_change("run", "stop");
431
432
433
434
435 if (failover_get_state() != FAILOVER_STATUS_NONE) {
436 goto out;
437 }
438
439
440 migrate_set_block_enabled(false, &local_err);
441 if (local_err) {
442 goto out;
443 }
444 qemu_mutex_lock_iothread();
445
446#ifdef CONFIG_REPLICATION
447 replication_do_checkpoint_all(&local_err);
448 if (local_err) {
449 qemu_mutex_unlock_iothread();
450 goto out;
451 }
452#else
453 abort();
454#endif
455
456 colo_send_message(s->to_dst_file, COLO_MESSAGE_VMSTATE_SEND, &local_err);
457 if (local_err) {
458 qemu_mutex_unlock_iothread();
459 goto out;
460 }
461
462 ret = qemu_save_device_state(fb);
463
464 qemu_mutex_unlock_iothread();
465 if (ret < 0) {
466 goto out;
467 }
468
469
470
471
472
473 qemu_savevm_live_state(s->to_dst_file);
474
475 qemu_fflush(fb);
476
477
478
479
480
481 colo_send_message_value(s->to_dst_file, COLO_MESSAGE_VMSTATE_SIZE,
482 bioc->usage, &local_err);
483 if (local_err) {
484 goto out;
485 }
486
487 qemu_put_buffer(s->to_dst_file, bioc->data, bioc->usage);
488 qemu_fflush(s->to_dst_file);
489 ret = qemu_file_get_error(s->to_dst_file);
490 if (ret < 0) {
491 goto out;
492 }
493
494 colo_receive_check_message(s->rp_state.from_dst_file,
495 COLO_MESSAGE_VMSTATE_RECEIVED, &local_err);
496 if (local_err) {
497 goto out;
498 }
499
500 qemu_event_reset(&s->colo_checkpoint_event);
501 colo_notify_compares_event(NULL, COLO_EVENT_CHECKPOINT, &local_err);
502 if (local_err) {
503 goto out;
504 }
505
506 colo_receive_check_message(s->rp_state.from_dst_file,
507 COLO_MESSAGE_VMSTATE_LOADED, &local_err);
508 if (local_err) {
509 goto out;
510 }
511
512 ret = 0;
513
514 qemu_mutex_lock_iothread();
515 vm_start();
516 qemu_mutex_unlock_iothread();
517 trace_colo_vm_state_change("stop", "run");
518
519out:
520 if (local_err) {
521 error_report_err(local_err);
522 }
523 return ret;
524}
525
526static void colo_compare_notify_checkpoint(Notifier *notifier, void *data)
527{
528 colo_checkpoint_notify(data);
529}
530
531static void colo_process_checkpoint(MigrationState *s)
532{
533 QIOChannelBuffer *bioc;
534 QEMUFile *fb = NULL;
535 int64_t current_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
536 Error *local_err = NULL;
537 int ret;
538
539 last_colo_mode = get_colo_mode();
540 if (last_colo_mode != COLO_MODE_PRIMARY) {
541 error_report("COLO mode must be COLO_MODE_PRIMARY");
542 return;
543 }
544
545 failover_init_state();
546
547 s->rp_state.from_dst_file = qemu_file_get_return_path(s->to_dst_file);
548 if (!s->rp_state.from_dst_file) {
549 error_report("Open QEMUFile from_dst_file failed");
550 goto out;
551 }
552
553 packets_compare_notifier.notify = colo_compare_notify_checkpoint;
554 colo_compare_register_notifier(&packets_compare_notifier);
555
556
557
558
559
560 colo_receive_check_message(s->rp_state.from_dst_file,
561 COLO_MESSAGE_CHECKPOINT_READY, &local_err);
562 if (local_err) {
563 goto out;
564 }
565 bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
566 fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
567 object_unref(OBJECT(bioc));
568
569 qemu_mutex_lock_iothread();
570#ifdef CONFIG_REPLICATION
571 replication_start_all(REPLICATION_MODE_PRIMARY, &local_err);
572 if (local_err) {
573 qemu_mutex_unlock_iothread();
574 goto out;
575 }
576#else
577 abort();
578#endif
579
580 vm_start();
581 qemu_mutex_unlock_iothread();
582 trace_colo_vm_state_change("stop", "run");
583
584 timer_mod(s->colo_delay_timer,
585 current_time + s->parameters.x_checkpoint_delay);
586
587 while (s->state == MIGRATION_STATUS_COLO) {
588 if (failover_get_state() != FAILOVER_STATUS_NONE) {
589 error_report("failover request");
590 goto out;
591 }
592
593 qemu_event_wait(&s->colo_checkpoint_event);
594
595 if (s->state != MIGRATION_STATUS_COLO) {
596 goto out;
597 }
598 ret = colo_do_checkpoint_transaction(s, bioc, fb);
599 if (ret < 0) {
600 goto out;
601 }
602 }
603
604out:
605
606 if (local_err) {
607 error_report_err(local_err);
608 }
609
610 if (fb) {
611 qemu_fclose(fb);
612 }
613
614
615
616
617
618 switch (failover_get_state()) {
619 case FAILOVER_STATUS_COMPLETED:
620 qapi_event_send_colo_exit(COLO_MODE_PRIMARY,
621 COLO_EXIT_REASON_REQUEST);
622 break;
623 default:
624 qapi_event_send_colo_exit(COLO_MODE_PRIMARY,
625 COLO_EXIT_REASON_ERROR);
626 }
627
628
629 qemu_sem_wait(&s->colo_exit_sem);
630 qemu_sem_destroy(&s->colo_exit_sem);
631
632
633
634
635
636
637
638 colo_compare_unregister_notifier(&packets_compare_notifier);
639 timer_free(s->colo_delay_timer);
640 qemu_event_destroy(&s->colo_checkpoint_event);
641
642
643
644
645
646
647 if (s->rp_state.from_dst_file) {
648 qemu_fclose(s->rp_state.from_dst_file);
649 }
650}
651
652void colo_checkpoint_notify(void *opaque)
653{
654 MigrationState *s = opaque;
655 int64_t next_notify_time;
656
657 qemu_event_set(&s->colo_checkpoint_event);
658 s->colo_checkpoint_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
659 next_notify_time = s->colo_checkpoint_time +
660 s->parameters.x_checkpoint_delay;
661 timer_mod(s->colo_delay_timer, next_notify_time);
662}
663
664void migrate_start_colo_process(MigrationState *s)
665{
666 qemu_mutex_unlock_iothread();
667 qemu_event_init(&s->colo_checkpoint_event, false);
668 s->colo_delay_timer = timer_new_ms(QEMU_CLOCK_HOST,
669 colo_checkpoint_notify, s);
670
671 qemu_sem_init(&s->colo_exit_sem, 0);
672 migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE,
673 MIGRATION_STATUS_COLO);
674 colo_process_checkpoint(s);
675 qemu_mutex_lock_iothread();
676}
677
678static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
679 QEMUFile *fb, QIOChannelBuffer *bioc, Error **errp)
680{
681 uint64_t total_size;
682 uint64_t value;
683 Error *local_err = NULL;
684 int ret;
685
686 qemu_mutex_lock_iothread();
687 vm_stop_force_state(RUN_STATE_COLO);
688 trace_colo_vm_state_change("run", "stop");
689 qemu_mutex_unlock_iothread();
690
691
692 colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
693 &local_err);
694 if (local_err) {
695 error_propagate(errp, local_err);
696 return;
697 }
698
699 colo_receive_check_message(mis->from_src_file,
700 COLO_MESSAGE_VMSTATE_SEND, &local_err);
701 if (local_err) {
702 error_propagate(errp, local_err);
703 return;
704 }
705
706 qemu_mutex_lock_iothread();
707 cpu_synchronize_all_states();
708 ret = qemu_loadvm_state_main(mis->from_src_file, mis);
709 qemu_mutex_unlock_iothread();
710
711 if (ret < 0) {
712 error_setg(errp, "Load VM's live state (ram) error");
713 return;
714 }
715
716 value = colo_receive_message_value(mis->from_src_file,
717 COLO_MESSAGE_VMSTATE_SIZE, &local_err);
718 if (local_err) {
719 error_propagate(errp, local_err);
720 return;
721 }
722
723
724
725
726
727
728 if (value > bioc->capacity) {
729 bioc->capacity = value;
730 bioc->data = g_realloc(bioc->data, bioc->capacity);
731 }
732 total_size = qemu_get_buffer(mis->from_src_file, bioc->data, value);
733 if (total_size != value) {
734 error_setg(errp, "Got %" PRIu64 " VMState data, less than expected"
735 " %" PRIu64, total_size, value);
736 return;
737 }
738 bioc->usage = total_size;
739 qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
740
741 colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_RECEIVED,
742 &local_err);
743 if (local_err) {
744 error_propagate(errp, local_err);
745 return;
746 }
747
748 qemu_mutex_lock_iothread();
749 vmstate_loading = true;
750 colo_flush_ram_cache();
751 ret = qemu_load_device_state(fb);
752 if (ret < 0) {
753 error_setg(errp, "COLO: load device state failed");
754 vmstate_loading = false;
755 qemu_mutex_unlock_iothread();
756 return;
757 }
758
759#ifdef CONFIG_REPLICATION
760 replication_get_error_all(&local_err);
761 if (local_err) {
762 error_propagate(errp, local_err);
763 vmstate_loading = false;
764 qemu_mutex_unlock_iothread();
765 return;
766 }
767
768
769 replication_do_checkpoint_all(&local_err);
770 if (local_err) {
771 error_propagate(errp, local_err);
772 vmstate_loading = false;
773 qemu_mutex_unlock_iothread();
774 return;
775 }
776#else
777 abort();
778#endif
779
780 colo_notify_filters_event(COLO_EVENT_CHECKPOINT, &local_err);
781
782 if (local_err) {
783 error_propagate(errp, local_err);
784 vmstate_loading = false;
785 qemu_mutex_unlock_iothread();
786 return;
787 }
788
789 vmstate_loading = false;
790 vm_start();
791 trace_colo_vm_state_change("stop", "run");
792 qemu_mutex_unlock_iothread();
793
794 if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
795 return;
796 }
797
798 colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_LOADED,
799 &local_err);
800 error_propagate(errp, local_err);
801}
802
803static void colo_wait_handle_message(MigrationIncomingState *mis,
804 QEMUFile *fb, QIOChannelBuffer *bioc, Error **errp)
805{
806 COLOMessage msg;
807 Error *local_err = NULL;
808
809 msg = colo_receive_message(mis->from_src_file, &local_err);
810 if (local_err) {
811 error_propagate(errp, local_err);
812 return;
813 }
814
815 switch (msg) {
816 case COLO_MESSAGE_CHECKPOINT_REQUEST:
817 colo_incoming_process_checkpoint(mis, fb, bioc, errp);
818 break;
819 default:
820 error_setg(errp, "Got unknown COLO message: %d", msg);
821 break;
822 }
823}
824
825void *colo_process_incoming_thread(void *opaque)
826{
827 MigrationIncomingState *mis = opaque;
828 QEMUFile *fb = NULL;
829 QIOChannelBuffer *bioc = NULL;
830 Error *local_err = NULL;
831
832 rcu_register_thread();
833 qemu_sem_init(&mis->colo_incoming_sem, 0);
834
835 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
836 MIGRATION_STATUS_COLO);
837
838 last_colo_mode = get_colo_mode();
839 if (last_colo_mode != COLO_MODE_SECONDARY) {
840 error_report("COLO mode must be COLO_MODE_SECONDARY");
841 return NULL;
842 }
843
844 failover_init_state();
845
846 mis->to_src_file = qemu_file_get_return_path(mis->from_src_file);
847 if (!mis->to_src_file) {
848 error_report("COLO incoming thread: Open QEMUFile to_src_file failed");
849 goto out;
850 }
851
852
853
854
855
856
857 qemu_file_set_blocking(mis->from_src_file, true);
858
859 colo_incoming_start_dirty_log();
860
861 bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
862 fb = qemu_fopen_channel_input(QIO_CHANNEL(bioc));
863 object_unref(OBJECT(bioc));
864
865 qemu_mutex_lock_iothread();
866#ifdef CONFIG_REPLICATION
867 replication_start_all(REPLICATION_MODE_SECONDARY, &local_err);
868 if (local_err) {
869 qemu_mutex_unlock_iothread();
870 goto out;
871 }
872#else
873 abort();
874#endif
875 vm_start();
876 trace_colo_vm_state_change("stop", "run");
877 qemu_mutex_unlock_iothread();
878
879 colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_READY,
880 &local_err);
881 if (local_err) {
882 goto out;
883 }
884
885 while (mis->state == MIGRATION_STATUS_COLO) {
886 colo_wait_handle_message(mis, fb, bioc, &local_err);
887 if (local_err) {
888 error_report_err(local_err);
889 break;
890 }
891
892 if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
893 failover_set_state(FAILOVER_STATUS_RELAUNCH,
894 FAILOVER_STATUS_NONE);
895 failover_request_active(NULL);
896 break;
897 }
898
899 if (failover_get_state() != FAILOVER_STATUS_NONE) {
900 error_report("failover request");
901 break;
902 }
903 }
904
905out:
906
907
908
909
910 switch (failover_get_state()) {
911 case FAILOVER_STATUS_COMPLETED:
912 qapi_event_send_colo_exit(COLO_MODE_SECONDARY,
913 COLO_EXIT_REASON_REQUEST);
914 break;
915 default:
916 qapi_event_send_colo_exit(COLO_MODE_SECONDARY,
917 COLO_EXIT_REASON_ERROR);
918 }
919
920 if (fb) {
921 qemu_fclose(fb);
922 }
923
924
925 qemu_sem_wait(&mis->colo_incoming_sem);
926 qemu_sem_destroy(&mis->colo_incoming_sem);
927
928 if (mis->to_src_file) {
929 qemu_fclose(mis->to_src_file);
930 mis->to_src_file = NULL;
931 }
932
933 rcu_unregister_thread();
934 return NULL;
935}
936