build: move COLO under CONFIG_REPLICATION

We don't allow to use x-colo capability when replication is not
configured. So, no reason to build COLO when replication is disabled,
it's unusable in this case.

Note also that the check in migrate_caps_check() is not the only
restriction: some functions in migration/colo.c will just abort if
called with not defined CONFIG_REPLICATION, for example:

    migration_iteration_finish()
       case MIGRATION_STATUS_COLO:
           migrate_start_colo_process()
               colo_process_checkpoint()
                   abort()

It could probably make sense to have possibility to enable COLO without
REPLICATION, but this requires deeper audit of colo & replication code,
which may be done later if needed.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Acked-by: Dr. David Alan Gilbert <dave@treblig.org>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20230428194928.1426370-4-vsementsov@yandex-team.ru>
Signed-off-by: Juan Quintela <quintela@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c
index 4e9f00e7dc..9885d7c9f7 100644
--- a/migration/migration-hmp-cmds.c
+++ b/migration/migration-hmp-cmds.c
@@ -643,6 +643,7 @@ void hmp_migrate_start_postcopy(Monitor *mon, const QDict *qdict)
     hmp_handle_error(mon, err);
 }
 
+#ifdef CONFIG_REPLICATION
 void hmp_x_colo_lost_heartbeat(Monitor *mon, const QDict *qdict)
 {
     Error *err = NULL;
@@ -650,6 +651,7 @@ void hmp_x_colo_lost_heartbeat(Monitor *mon, const QDict *qdict)
     qmp_x_colo_lost_heartbeat(&err);
     hmp_handle_error(mon, err);
 }
+#endif
 
 typedef struct HMPMigrationStatus {
     QEMUTimer *timer;