Re: [Qemu-devel] [PATCH] migration: invalidate cache before source start

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Vladimir Sementsov-Ogievskiy (vsementsov@virtuozzo.com) wrote:
> Invalidate cache before source start in case of failed migration.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Why doesn't the code at the bottom of migration_completion,
fail_invalidate:   and the code in migrate_fd_cancel   handle this?

What case did you see it in that those didn't handle?
(Also I guess it probably should set s->block_inactive = false)

Dave

> ---
> 
>  migration/migration.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/migration/migration.c b/migration/migration.c
> index 1e99ec9b7e..8f39e0dc02 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -2806,7 +2806,14 @@ static void migration_iteration_finish(MigrationState *s)
>      case MIGRATION_STATUS_FAILED:
>      case MIGRATION_STATUS_CANCELLED:
>          if (s->vm_was_running) {
> -            vm_start();
> +            Error *local_err = NULL;
> +            bdrv_invalidate_cache_all(&local_err);
> +            if (local_err) {
> +                error_reportf_err(local_err, "Can't invalidate disks before "
> +                                  "source vm start");
> +            } else {
> +                vm_start();
> +            }
>          } else {
>              if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
>                  runstate_set(RUN_STATE_POSTMIGRATE);
> -- 
> 2.11.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK