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migration: disallow change capabilities in COLO state 

COLO is not listed as running state in migrate_is_running(), so, it's
theoretically possible to disable colo capability in COLO state and the
unexpected error in migration_iteration_finish() is reachable.

Let's disallow that in qmp_migrate_set_capabilities. Than the error
becomes absolutely unreachable: we can get into COLO state only with
enabled capability and can't disable it while we are in COLO state. So
substitute the error by simple assertion.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <20230428194928.1426370-10-vsementsov@yandex-team.ru>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2023-04-28 22:49:27 +03:00 committed by Juan Quintela
parent ecbfec6d77
commit d70178a88f
2 changed files with 2 additions and 5 deletions
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5
migration/migration.c
View File

@ -2785,10 +2785,7 @@ static void migration_iteration_finish(MigrationState *s)
runstate_set(RUN_STATE_POSTMIGRATE);
break;
case MIGRATION_STATUS_COLO:
if (!migrate_colo()) {
error_report("%s: critical error: calling COLO code without "
"COLO enabled", __func__);
}
assert(migrate_colo());
migrate_start_colo_process(s);
s->vm_was_running = true;
/* Fallthrough */

2
migration/options.c
View File

@ -598,7 +598,7 @@ void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
MigrationCapabilityStatusList *cap;
bool new_caps[MIGRATION_CAPABILITY__MAX];
if (migration_is_running(s->state)) {
if (migration_is_running(s->state) || migration_in_colo_state()) {
error_setg(errp, QERR_MIGRATION_ACTIVE);
return;
}