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migration: Reject qmp_migrate_cancel after postcopy

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After postcopy has started, it's not possible to recover the source
machine in case a migration error occurs because the destination has
already been changing the state of the machine. For that same reason,
it doesn't make sense to try to cancel the migration after postcopy
has started. Reject the cancel command during postcopy.

Reviewed-by: Peter Xu <peterx@redhat.com>
Message-ID: <20250213175927.19642-6-farosas@suse.de>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
This commit is contained in:
Fabiano Rosas 2025-02-13 14:59:23 -03:00
parent 2b667a8c0f
commit 646119088f
1 changed files with 12 additions and 1 deletions
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13
migration/migration.c
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@ -2251,7 +2251,18 @@ static void qmp_migrate_finish(MigrationAddress *addr, bool resume_requested,
void qmp_migrate_cancel(Error **errp)
{
migration_cancel(NULL);
/*
* After postcopy migration has started, the source machine is not
* recoverable in case of a migration error. This also means the
* cancel command cannot be used as cancel should allow the
* machine to continue operation.
*/
if (migration_in_postcopy()) {
error_setg(errp, "Postcopy migration in progress, cannot cancel.");
return;
}
migration_cancel();
}
void qmp_migrate_continue(MigrationStatus state, Error **errp)