From: Dr. David Alan Gilbert Date: Wed, 28 Mar 2018 17:02:07 +0000 (+0100) Subject: migration: Don't activate block devices if using -S X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=0746a92612276aee69e66dfe6782b0f882d221d5;p=people%2Fpauldu%2Fqemu.git migration: Don't activate block devices if using -S Activating the block devices causes the locks to be taken on the backing file. If we're running with -S and the destination libvirt hasn't started the destination with 'cont', it's expecting the locks are still untaken. Don't activate the block devices if we're not going to autostart the VM; 'cont' already will do that anyway. bz: https://bugzilla.redhat.com/show_bug.cgi?id=1560854 Signed-off-by: Dr. David Alan Gilbert Message-Id: <20180328170207.49512-1-dgilbert@redhat.com> Reviewed-by: Eric Blake Signed-off-by: Dr. David Alan Gilbert --- diff --git a/migration/migration.c b/migration/migration.c index 52a5092add..58bd382730 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -306,13 +306,21 @@ static void process_incoming_migration_bh(void *opaque) Error *local_err = NULL; MigrationIncomingState *mis = opaque; - /* Make sure all file formats flush their mutable metadata. - * If we get an error here, just don't restart the VM yet. */ - bdrv_invalidate_cache_all(&local_err); - if (local_err) { - error_report_err(local_err); - local_err = NULL; - autostart = false; + /* Only fire up the block code now if we're going to restart the + * VM, else 'cont' will do it. + * This causes file locking to happen; so we don't want it to happen + * unless we really are starting the VM. + */ + if (autostart && (!global_state_received() || + global_state_get_runstate() == RUN_STATE_RUNNING)) { + /* Make sure all file formats flush their mutable metadata. + * If we get an error here, just don't restart the VM yet. */ + bdrv_invalidate_cache_all(&local_err); + if (local_err) { + error_report_err(local_err); + local_err = NULL; + autostart = false; + } } /*