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migration: use switch at the end of migration

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It converts the old if clauses into switch, explicitly mentions the
possible migration states.  The old nested "if"s are not clear on what
we do on different states.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2018-01-03 20:20:12 +08:00 committed by Juan Quintela
parent cf011f082d
commit 39b9e17905
1 changed files with 27 additions and 17 deletions
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44
migration/migration.c
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@ -2341,26 +2341,30 @@ static void *migration_thread(void *opaque)
cpu_throttle_stop();
qemu_mutex_lock_iothread();
if (s->state == MIGRATION_STATUS_COMPLETED) {
switch (s->state) {
case MIGRATION_STATUS_COMPLETED:
migration_calculate_complete(s);
runstate_set(RUN_STATE_POSTMIGRATE);
} else {
if (s->state == MIGRATION_STATUS_ACTIVE) {
/*
* We should really assert here, but since it's during
* migration, let's try to reduce the usage of assertions.
*/
if (!migrate_colo_enabled()) {
error_report("%s: critical error: calling COLO code without "
"COLO enabled", __func__);
}
migrate_start_colo_process(s);
/*
* Fixme: we will run VM in COLO no matter its old running state.
* After exited COLO, we will keep running.
*/
s->vm_was_running = true;
break;
case MIGRATION_STATUS_ACTIVE:
/*
* We should really assert here, but since it's during
* migration, let's try to reduce the usage of assertions.
*/
if (!migrate_colo_enabled()) {
error_report("%s: critical error: calling COLO code without "
"COLO enabled", __func__);
}
migrate_start_colo_process(s);
/*
* Fixme: we will run VM in COLO no matter its old running state.
* After exited COLO, we will keep running.
*/
s->vm_was_running = true;
/* Fallthrough */
case MIGRATION_STATUS_FAILED:
case MIGRATION_STATUS_CANCELLED:
if (s->vm_was_running) {
vm_start();
} else {
@ -2368,6 +2372,12 @@ static void *migration_thread(void *opaque)
runstate_set(RUN_STATE_POSTMIGRATE);
}
}
break;
default:
/* Should not reach here, but if so, forgive the VM. */
error_report("%s: Unknown ending state %d", __func__, s->state);
break;
}
qemu_bh_schedule(s->cleanup_bh);
qemu_mutex_unlock_iothread();