[PULL 07/12] migration: add missing qemu_mutex_lock_iothread in migration_completion

[Paolo Bonzini <pbonzini@redhat.com>]

From: Emanuele Giuseppe Esposito <eesposit@redhat.com>

qemu_savevm_state_complete_postcopy assumes the iothread lock (BQL)
to be held, but instead it isn't.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20211005080751.3797161-3-eesposit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 migration/migration.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/migration/migration.c b/migration/migration.c
index bb909781b7..6ac807ef3d 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -3168,7 +3168,10 @@ static void migration_completion(MigrationState *s)
     } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
         trace_migration_completion_postcopy_end();
 
+        qemu_mutex_lock_iothread();
         qemu_savevm_state_complete_postcopy(s->to_dst_file);
+        qemu_mutex_unlock_iothread();
+
         trace_migration_completion_postcopy_end_after_complete();
     } else if (s->state == MIGRATION_STATUS_CANCELLING) {
         goto fail;
-- 
2.31.1