block: New BdrvChildRole.activate() for blk_resume_after_migration()

Instead of manually calling blk_resume_after_migration() in migration
code after doing bdrv_invalidate_cache_all(), integrate the BlockBackend
activation with cache invalidation into a single function. This is
achieved with a new callback in BdrvChildRole that is called by
bdrv_invalidate_cache_all().

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/qmp.c b/qmp.c
index 25b5050f9f..f656940769 100644
--- a/qmp.c
+++ b/qmp.c
@@ -207,12 +207,6 @@ void qmp_cont(Error **errp)
         return;
     }
 
-    blk_resume_after_migration(&local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-        return;
-    }
-
     if (runstate_check(RUN_STATE_INMIGRATE)) {
         autostart = 1;
     } else {