2 * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
3 * (a.k.a. Fault Tolerance or Continuous Replication)
5 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
6 * Copyright (c) 2016 FUJITSU LIMITED
7 * Copyright (c) 2016 Intel Corporation
9 * This work is licensed under the terms of the GNU GPL, version 2 or
10 * later. See the COPYING file in the top-level directory.
13 #include "qemu/osdep.h"
14 #include "sysemu/sysemu.h"
15 #include "qapi/error.h"
16 #include "qapi/qapi-commands-migration.h"
17 #include "migration.h"
18 #include "qemu-file.h"
20 #include "migration/colo.h"
22 #include "io/channel-buffer.h"
24 #include "qemu/error-report.h"
25 #include "qemu/main-loop.h"
27 #include "migration/failover.h"
28 #include "migration/ram.h"
29 #ifdef CONFIG_REPLICATION
30 #include "block/replication.h"
32 #include "net/colo-compare.h"
34 #include "block/block.h"
35 #include "qapi/qapi-events-migration.h"
36 #include "sysemu/cpus.h"
37 #include "sysemu/runstate.h"
38 #include "net/filter.h"
40 static bool vmstate_loading
;
41 static Notifier packets_compare_notifier
;
43 /* User need to know colo mode after COLO failover */
44 static COLOMode last_colo_mode
;
46 #define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024)
48 bool migration_in_colo_state(void)
50 MigrationState
*s
= migrate_get_current();
52 return (s
->state
== MIGRATION_STATUS_COLO
);
55 bool migration_incoming_in_colo_state(void)
57 MigrationIncomingState
*mis
= migration_incoming_get_current();
59 return mis
&& (mis
->state
== MIGRATION_STATUS_COLO
);
62 static bool colo_runstate_is_stopped(void)
64 return runstate_check(RUN_STATE_COLO
) || !runstate_is_running();
67 static void secondary_vm_do_failover(void)
69 /* COLO needs enable block-replication */
70 #ifdef CONFIG_REPLICATION
72 MigrationIncomingState
*mis
= migration_incoming_get_current();
73 Error
*local_err
= NULL
;
75 /* Can not do failover during the process of VM's loading VMstate, Or
76 * it will break the secondary VM.
78 if (vmstate_loading
) {
79 old_state
= failover_set_state(FAILOVER_STATUS_ACTIVE
,
80 FAILOVER_STATUS_RELAUNCH
);
81 if (old_state
!= FAILOVER_STATUS_ACTIVE
) {
82 error_report("Unknown error while do failover for secondary VM,"
83 "old_state: %s", FailoverStatus_str(old_state
));
88 migrate_set_state(&mis
->state
, MIGRATION_STATUS_COLO
,
89 MIGRATION_STATUS_COMPLETED
);
91 replication_stop_all(true, &local_err
);
93 error_report_err(local_err
);
97 /* Notify all filters of all NIC to do checkpoint */
98 colo_notify_filters_event(COLO_EVENT_FAILOVER
, &local_err
);
100 error_report_err(local_err
);
104 error_report("\"-S\" qemu option will be ignored in secondary side");
105 /* recover runstate to normal migration finish state */
109 * Make sure COLO incoming thread not block in recv or send,
110 * If mis->from_src_file and mis->to_src_file use the same fd,
111 * The second shutdown() will return -1, we ignore this value,
114 if (mis
->from_src_file
) {
115 qemu_file_shutdown(mis
->from_src_file
);
117 if (mis
->to_src_file
) {
118 qemu_file_shutdown(mis
->to_src_file
);
121 old_state
= failover_set_state(FAILOVER_STATUS_ACTIVE
,
122 FAILOVER_STATUS_COMPLETED
);
123 if (old_state
!= FAILOVER_STATUS_ACTIVE
) {
124 error_report("Incorrect state (%s) while doing failover for "
125 "secondary VM", FailoverStatus_str(old_state
));
128 /* Notify COLO incoming thread that failover work is finished */
129 qemu_sem_post(&mis
->colo_incoming_sem
);
131 /* For Secondary VM, jump to incoming co */
132 if (mis
->migration_incoming_co
) {
133 qemu_coroutine_enter(mis
->migration_incoming_co
);
140 static void primary_vm_do_failover(void)
142 #ifdef CONFIG_REPLICATION
143 MigrationState
*s
= migrate_get_current();
145 Error
*local_err
= NULL
;
147 migrate_set_state(&s
->state
, MIGRATION_STATUS_COLO
,
148 MIGRATION_STATUS_COMPLETED
);
150 * kick COLO thread which might wait at
151 * qemu_sem_wait(&s->colo_checkpoint_sem).
153 colo_checkpoint_notify(s
);
156 * Wake up COLO thread which may blocked in recv() or send(),
157 * The s->rp_state.from_dst_file and s->to_dst_file may use the
158 * same fd, but we still shutdown the fd for twice, it is harmless.
160 if (s
->to_dst_file
) {
161 qemu_file_shutdown(s
->to_dst_file
);
163 if (s
->rp_state
.from_dst_file
) {
164 qemu_file_shutdown(s
->rp_state
.from_dst_file
);
167 old_state
= failover_set_state(FAILOVER_STATUS_ACTIVE
,
168 FAILOVER_STATUS_COMPLETED
);
169 if (old_state
!= FAILOVER_STATUS_ACTIVE
) {
170 error_report("Incorrect state (%s) while doing failover for Primary VM",
171 FailoverStatus_str(old_state
));
175 replication_stop_all(true, &local_err
);
177 error_report_err(local_err
);
181 /* Notify COLO thread that failover work is finished */
182 qemu_sem_post(&s
->colo_exit_sem
);
188 COLOMode
get_colo_mode(void)
190 if (migration_in_colo_state()) {
191 return COLO_MODE_PRIMARY
;
192 } else if (migration_incoming_in_colo_state()) {
193 return COLO_MODE_SECONDARY
;
195 return COLO_MODE_NONE
;
199 void colo_do_failover(void)
201 /* Make sure VM stopped while failover happened. */
202 if (!colo_runstate_is_stopped()) {
203 vm_stop_force_state(RUN_STATE_COLO
);
206 switch (last_colo_mode
= get_colo_mode()) {
207 case COLO_MODE_PRIMARY
:
208 primary_vm_do_failover();
210 case COLO_MODE_SECONDARY
:
211 secondary_vm_do_failover();
214 error_report("colo_do_failover failed because the colo mode"
215 " could not be obtained");
219 #ifdef CONFIG_REPLICATION
220 void qmp_xen_set_replication(bool enable
, bool primary
,
221 bool has_failover
, bool failover
,
224 ReplicationMode mode
= primary
?
225 REPLICATION_MODE_PRIMARY
:
226 REPLICATION_MODE_SECONDARY
;
228 if (has_failover
&& enable
) {
229 error_setg(errp
, "Parameter 'failover' is only for"
230 " stopping replication");
235 replication_start_all(mode
, errp
);
240 replication_stop_all(failover
, failover
? NULL
: errp
);
244 ReplicationStatus
*qmp_query_xen_replication_status(Error
**errp
)
247 ReplicationStatus
*s
= g_new0(ReplicationStatus
, 1);
249 replication_get_error_all(&err
);
252 s
->desc
= g_strdup(error_get_pretty(err
));
261 void qmp_xen_colo_do_checkpoint(Error
**errp
)
265 replication_do_checkpoint_all(&err
);
267 error_propagate(errp
, err
);
270 /* Notify all filters of all NIC to do checkpoint */
271 colo_notify_filters_event(COLO_EVENT_CHECKPOINT
, errp
);
275 COLOStatus
*qmp_query_colo_status(Error
**errp
)
277 COLOStatus
*s
= g_new0(COLOStatus
, 1);
279 s
->mode
= get_colo_mode();
280 s
->last_mode
= last_colo_mode
;
282 switch (failover_get_state()) {
283 case FAILOVER_STATUS_NONE
:
284 s
->reason
= COLO_EXIT_REASON_NONE
;
286 case FAILOVER_STATUS_COMPLETED
:
287 s
->reason
= COLO_EXIT_REASON_REQUEST
;
290 if (migration_in_colo_state()) {
291 s
->reason
= COLO_EXIT_REASON_PROCESSING
;
293 s
->reason
= COLO_EXIT_REASON_ERROR
;
300 static void colo_send_message(QEMUFile
*f
, COLOMessage msg
,
305 if (msg
>= COLO_MESSAGE__MAX
) {
306 error_setg(errp
, "%s: Invalid message", __func__
);
309 qemu_put_be32(f
, msg
);
312 ret
= qemu_file_get_error(f
);
314 error_setg_errno(errp
, -ret
, "Can't send COLO message");
316 trace_colo_send_message(COLOMessage_str(msg
));
319 static void colo_send_message_value(QEMUFile
*f
, COLOMessage msg
,
320 uint64_t value
, Error
**errp
)
322 Error
*local_err
= NULL
;
325 colo_send_message(f
, msg
, &local_err
);
327 error_propagate(errp
, local_err
);
330 qemu_put_be64(f
, value
);
333 ret
= qemu_file_get_error(f
);
335 error_setg_errno(errp
, -ret
, "Failed to send value for message:%s",
336 COLOMessage_str(msg
));
340 static COLOMessage
colo_receive_message(QEMUFile
*f
, Error
**errp
)
345 msg
= qemu_get_be32(f
);
346 ret
= qemu_file_get_error(f
);
348 error_setg_errno(errp
, -ret
, "Can't receive COLO message");
351 if (msg
>= COLO_MESSAGE__MAX
) {
352 error_setg(errp
, "%s: Invalid message", __func__
);
355 trace_colo_receive_message(COLOMessage_str(msg
));
359 static void colo_receive_check_message(QEMUFile
*f
, COLOMessage expect_msg
,
363 Error
*local_err
= NULL
;
365 msg
= colo_receive_message(f
, &local_err
);
367 error_propagate(errp
, local_err
);
370 if (msg
!= expect_msg
) {
371 error_setg(errp
, "Unexpected COLO message %d, expected %d",
376 static uint64_t colo_receive_message_value(QEMUFile
*f
, uint32_t expect_msg
,
379 Error
*local_err
= NULL
;
383 colo_receive_check_message(f
, expect_msg
, &local_err
);
385 error_propagate(errp
, local_err
);
389 value
= qemu_get_be64(f
);
390 ret
= qemu_file_get_error(f
);
392 error_setg_errno(errp
, -ret
, "Failed to get value for COLO message: %s",
393 COLOMessage_str(expect_msg
));
398 static int colo_do_checkpoint_transaction(MigrationState
*s
,
399 QIOChannelBuffer
*bioc
,
402 Error
*local_err
= NULL
;
405 colo_send_message(s
->to_dst_file
, COLO_MESSAGE_CHECKPOINT_REQUEST
,
411 colo_receive_check_message(s
->rp_state
.from_dst_file
,
412 COLO_MESSAGE_CHECKPOINT_REPLY
, &local_err
);
416 /* Reset channel-buffer directly */
417 qio_channel_io_seek(QIO_CHANNEL(bioc
), 0, 0, NULL
);
420 qemu_mutex_lock_iothread();
421 if (failover_get_state() != FAILOVER_STATUS_NONE
) {
422 qemu_mutex_unlock_iothread();
425 vm_stop_force_state(RUN_STATE_COLO
);
426 qemu_mutex_unlock_iothread();
427 trace_colo_vm_state_change("run", "stop");
429 * Failover request bh could be called after vm_stop_force_state(),
430 * So we need check failover_request_is_active() again.
432 if (failover_get_state() != FAILOVER_STATUS_NONE
) {
435 qemu_mutex_lock_iothread();
437 #ifdef CONFIG_REPLICATION
438 replication_do_checkpoint_all(&local_err
);
440 qemu_mutex_unlock_iothread();
447 colo_send_message(s
->to_dst_file
, COLO_MESSAGE_VMSTATE_SEND
, &local_err
);
449 qemu_mutex_unlock_iothread();
452 /* Note: device state is saved into buffer */
453 ret
= qemu_save_device_state(fb
);
455 qemu_mutex_unlock_iothread();
460 if (migrate_auto_converge()) {
461 mig_throttle_counter_reset();
464 * Only save VM's live state, which not including device state.
465 * TODO: We may need a timeout mechanism to prevent COLO process
466 * to be blocked here.
468 qemu_savevm_live_state(s
->to_dst_file
);
473 * We need the size of the VMstate data in Secondary side,
474 * With which we can decide how much data should be read.
476 colo_send_message_value(s
->to_dst_file
, COLO_MESSAGE_VMSTATE_SIZE
,
477 bioc
->usage
, &local_err
);
482 qemu_put_buffer(s
->to_dst_file
, bioc
->data
, bioc
->usage
);
483 qemu_fflush(s
->to_dst_file
);
484 ret
= qemu_file_get_error(s
->to_dst_file
);
489 colo_receive_check_message(s
->rp_state
.from_dst_file
,
490 COLO_MESSAGE_VMSTATE_RECEIVED
, &local_err
);
495 qemu_event_reset(&s
->colo_checkpoint_event
);
496 colo_notify_compares_event(NULL
, COLO_EVENT_CHECKPOINT
, &local_err
);
501 colo_receive_check_message(s
->rp_state
.from_dst_file
,
502 COLO_MESSAGE_VMSTATE_LOADED
, &local_err
);
509 qemu_mutex_lock_iothread();
511 qemu_mutex_unlock_iothread();
512 trace_colo_vm_state_change("stop", "run");
516 error_report_err(local_err
);
521 static void colo_compare_notify_checkpoint(Notifier
*notifier
, void *data
)
523 colo_checkpoint_notify(data
);
526 static void colo_process_checkpoint(MigrationState
*s
)
528 QIOChannelBuffer
*bioc
;
530 Error
*local_err
= NULL
;
533 if (get_colo_mode() != COLO_MODE_PRIMARY
) {
534 error_report("COLO mode must be COLO_MODE_PRIMARY");
538 failover_init_state();
540 s
->rp_state
.from_dst_file
= qemu_file_get_return_path(s
->to_dst_file
);
541 if (!s
->rp_state
.from_dst_file
) {
542 error_report("Open QEMUFile from_dst_file failed");
546 packets_compare_notifier
.notify
= colo_compare_notify_checkpoint
;
547 colo_compare_register_notifier(&packets_compare_notifier
);
550 * Wait for Secondary finish loading VM states and enter COLO
553 colo_receive_check_message(s
->rp_state
.from_dst_file
,
554 COLO_MESSAGE_CHECKPOINT_READY
, &local_err
);
558 bioc
= qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE
);
559 fb
= qemu_file_new_output(QIO_CHANNEL(bioc
));
560 object_unref(OBJECT(bioc
));
562 qemu_mutex_lock_iothread();
563 #ifdef CONFIG_REPLICATION
564 replication_start_all(REPLICATION_MODE_PRIMARY
, &local_err
);
566 qemu_mutex_unlock_iothread();
574 qemu_mutex_unlock_iothread();
575 trace_colo_vm_state_change("stop", "run");
577 timer_mod(s
->colo_delay_timer
, qemu_clock_get_ms(QEMU_CLOCK_HOST
) +
578 s
->parameters
.x_checkpoint_delay
);
580 while (s
->state
== MIGRATION_STATUS_COLO
) {
581 if (failover_get_state() != FAILOVER_STATUS_NONE
) {
582 error_report("failover request");
586 qemu_event_wait(&s
->colo_checkpoint_event
);
588 if (s
->state
!= MIGRATION_STATUS_COLO
) {
591 ret
= colo_do_checkpoint_transaction(s
, bioc
, fb
);
598 /* Throw the unreported error message after exited from loop */
600 error_report_err(local_err
);
608 * There are only two reasons we can get here, some error happened
609 * or the user triggered failover.
611 switch (failover_get_state()) {
612 case FAILOVER_STATUS_COMPLETED
:
613 qapi_event_send_colo_exit(COLO_MODE_PRIMARY
,
614 COLO_EXIT_REASON_REQUEST
);
617 qapi_event_send_colo_exit(COLO_MODE_PRIMARY
,
618 COLO_EXIT_REASON_ERROR
);
621 /* Hope this not to be too long to wait here */
622 qemu_sem_wait(&s
->colo_exit_sem
);
623 qemu_sem_destroy(&s
->colo_exit_sem
);
626 * It is safe to unregister notifier after failover finished.
627 * Besides, colo_delay_timer and colo_checkpoint_sem can't be
628 * released before unregister notifier, or there will be use-after-free
631 colo_compare_unregister_notifier(&packets_compare_notifier
);
632 timer_free(s
->colo_delay_timer
);
633 qemu_event_destroy(&s
->colo_checkpoint_event
);
636 * Must be called after failover BH is completed,
637 * Or the failover BH may shutdown the wrong fd that
638 * re-used by other threads after we release here.
640 if (s
->rp_state
.from_dst_file
) {
641 qemu_fclose(s
->rp_state
.from_dst_file
);
642 s
->rp_state
.from_dst_file
= NULL
;
646 void colo_checkpoint_notify(void *opaque
)
648 MigrationState
*s
= opaque
;
649 int64_t next_notify_time
;
651 qemu_event_set(&s
->colo_checkpoint_event
);
652 s
->colo_checkpoint_time
= qemu_clock_get_ms(QEMU_CLOCK_HOST
);
653 next_notify_time
= s
->colo_checkpoint_time
+
654 s
->parameters
.x_checkpoint_delay
;
655 timer_mod(s
->colo_delay_timer
, next_notify_time
);
658 void migrate_start_colo_process(MigrationState
*s
)
660 qemu_mutex_unlock_iothread();
661 qemu_event_init(&s
->colo_checkpoint_event
, false);
662 s
->colo_delay_timer
= timer_new_ms(QEMU_CLOCK_HOST
,
663 colo_checkpoint_notify
, s
);
665 qemu_sem_init(&s
->colo_exit_sem
, 0);
666 colo_process_checkpoint(s
);
667 qemu_mutex_lock_iothread();
670 static void colo_incoming_process_checkpoint(MigrationIncomingState
*mis
,
671 QEMUFile
*fb
, QIOChannelBuffer
*bioc
, Error
**errp
)
675 Error
*local_err
= NULL
;
678 qemu_mutex_lock_iothread();
679 vm_stop_force_state(RUN_STATE_COLO
);
680 qemu_mutex_unlock_iothread();
681 trace_colo_vm_state_change("run", "stop");
683 /* FIXME: This is unnecessary for periodic checkpoint mode */
684 colo_send_message(mis
->to_src_file
, COLO_MESSAGE_CHECKPOINT_REPLY
,
687 error_propagate(errp
, local_err
);
691 colo_receive_check_message(mis
->from_src_file
,
692 COLO_MESSAGE_VMSTATE_SEND
, &local_err
);
694 error_propagate(errp
, local_err
);
698 qemu_mutex_lock_iothread();
699 cpu_synchronize_all_states();
700 ret
= qemu_loadvm_state_main(mis
->from_src_file
, mis
);
701 qemu_mutex_unlock_iothread();
704 error_setg(errp
, "Load VM's live state (ram) error");
708 value
= colo_receive_message_value(mis
->from_src_file
,
709 COLO_MESSAGE_VMSTATE_SIZE
, &local_err
);
711 error_propagate(errp
, local_err
);
716 * Read VM device state data into channel buffer,
717 * It's better to re-use the memory allocated.
718 * Here we need to handle the channel buffer directly.
720 if (value
> bioc
->capacity
) {
721 bioc
->capacity
= value
;
722 bioc
->data
= g_realloc(bioc
->data
, bioc
->capacity
);
724 total_size
= qemu_get_buffer(mis
->from_src_file
, bioc
->data
, value
);
725 if (total_size
!= value
) {
726 error_setg(errp
, "Got %" PRIu64
" VMState data, less than expected"
727 " %" PRIu64
, total_size
, value
);
730 bioc
->usage
= total_size
;
731 qio_channel_io_seek(QIO_CHANNEL(bioc
), 0, 0, NULL
);
733 colo_send_message(mis
->to_src_file
, COLO_MESSAGE_VMSTATE_RECEIVED
,
736 error_propagate(errp
, local_err
);
740 qemu_mutex_lock_iothread();
741 vmstate_loading
= true;
742 colo_flush_ram_cache();
743 ret
= qemu_load_device_state(fb
);
745 error_setg(errp
, "COLO: load device state failed");
746 vmstate_loading
= false;
747 qemu_mutex_unlock_iothread();
751 #ifdef CONFIG_REPLICATION
752 replication_get_error_all(&local_err
);
754 error_propagate(errp
, local_err
);
755 vmstate_loading
= false;
756 qemu_mutex_unlock_iothread();
760 /* discard colo disk buffer */
761 replication_do_checkpoint_all(&local_err
);
763 error_propagate(errp
, local_err
);
764 vmstate_loading
= false;
765 qemu_mutex_unlock_iothread();
771 /* Notify all filters of all NIC to do checkpoint */
772 colo_notify_filters_event(COLO_EVENT_CHECKPOINT
, &local_err
);
775 error_propagate(errp
, local_err
);
776 vmstate_loading
= false;
777 qemu_mutex_unlock_iothread();
781 vmstate_loading
= false;
783 qemu_mutex_unlock_iothread();
784 trace_colo_vm_state_change("stop", "run");
786 if (failover_get_state() == FAILOVER_STATUS_RELAUNCH
) {
790 colo_send_message(mis
->to_src_file
, COLO_MESSAGE_VMSTATE_LOADED
,
792 error_propagate(errp
, local_err
);
795 static void colo_wait_handle_message(MigrationIncomingState
*mis
,
796 QEMUFile
*fb
, QIOChannelBuffer
*bioc
, Error
**errp
)
799 Error
*local_err
= NULL
;
801 msg
= colo_receive_message(mis
->from_src_file
, &local_err
);
803 error_propagate(errp
, local_err
);
808 case COLO_MESSAGE_CHECKPOINT_REQUEST
:
809 colo_incoming_process_checkpoint(mis
, fb
, bioc
, errp
);
812 error_setg(errp
, "Got unknown COLO message: %d", msg
);
817 void colo_shutdown(void)
819 MigrationIncomingState
*mis
= NULL
;
820 MigrationState
*s
= NULL
;
822 switch (get_colo_mode()) {
823 case COLO_MODE_PRIMARY
:
824 s
= migrate_get_current();
825 qemu_event_set(&s
->colo_checkpoint_event
);
826 qemu_sem_post(&s
->colo_exit_sem
);
828 case COLO_MODE_SECONDARY
:
829 mis
= migration_incoming_get_current();
830 qemu_sem_post(&mis
->colo_incoming_sem
);
837 void *colo_process_incoming_thread(void *opaque
)
839 MigrationIncomingState
*mis
= opaque
;
841 QIOChannelBuffer
*bioc
= NULL
; /* Cache incoming device state */
842 Error
*local_err
= NULL
;
844 rcu_register_thread();
845 qemu_sem_init(&mis
->colo_incoming_sem
, 0);
847 migrate_set_state(&mis
->state
, MIGRATION_STATUS_ACTIVE
,
848 MIGRATION_STATUS_COLO
);
850 if (get_colo_mode() != COLO_MODE_SECONDARY
) {
851 error_report("COLO mode must be COLO_MODE_SECONDARY");
855 failover_init_state();
857 mis
->to_src_file
= qemu_file_get_return_path(mis
->from_src_file
);
858 if (!mis
->to_src_file
) {
859 error_report("COLO incoming thread: Open QEMUFile to_src_file failed");
863 * Note: the communication between Primary side and Secondary side
864 * should be sequential, we set the fd to unblocked in migration incoming
865 * coroutine, and here we are in the COLO incoming thread, so it is ok to
866 * set the fd back to blocked.
868 qemu_file_set_blocking(mis
->from_src_file
, true);
870 colo_incoming_start_dirty_log();
872 bioc
= qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE
);
873 fb
= qemu_file_new_input(QIO_CHANNEL(bioc
));
874 object_unref(OBJECT(bioc
));
876 qemu_mutex_lock_iothread();
877 #ifdef CONFIG_REPLICATION
878 replication_start_all(REPLICATION_MODE_SECONDARY
, &local_err
);
880 qemu_mutex_unlock_iothread();
887 qemu_mutex_unlock_iothread();
888 trace_colo_vm_state_change("stop", "run");
890 colo_send_message(mis
->to_src_file
, COLO_MESSAGE_CHECKPOINT_READY
,
896 while (mis
->state
== MIGRATION_STATUS_COLO
) {
897 colo_wait_handle_message(mis
, fb
, bioc
, &local_err
);
899 error_report_err(local_err
);
903 if (failover_get_state() == FAILOVER_STATUS_RELAUNCH
) {
904 failover_set_state(FAILOVER_STATUS_RELAUNCH
,
905 FAILOVER_STATUS_NONE
);
906 failover_request_active(NULL
);
910 if (failover_get_state() != FAILOVER_STATUS_NONE
) {
911 error_report("failover request");
918 * There are only two reasons we can get here, some error happened
919 * or the user triggered failover.
921 switch (failover_get_state()) {
922 case FAILOVER_STATUS_COMPLETED
:
923 qapi_event_send_colo_exit(COLO_MODE_SECONDARY
,
924 COLO_EXIT_REASON_REQUEST
);
927 qapi_event_send_colo_exit(COLO_MODE_SECONDARY
,
928 COLO_EXIT_REASON_ERROR
);
935 /* Hope this not to be too long to loop here */
936 qemu_sem_wait(&mis
->colo_incoming_sem
);
937 qemu_sem_destroy(&mis
->colo_incoming_sem
);
939 rcu_unregister_thread();