After bitmap loading the bitmap is not persistent and is removed on image
saving. Set bitmap persistence to true.

Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
---
 block/parallels-ext.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/parallels-ext.c b/block/parallels-ext.c
index ebda6b0a01..bb4478c350 100644
--- a/block/parallels-ext.c
+++ b/block/parallels-ext.c
@@ -256,6 +256,7 @@ static int parallels_parse_format_extension(BlockDriverState *bs,
             if (!bitmap) {
                 goto fail;
             }
+            bdrv_dirty_bitmap_set_persistence(bitmap, true);
             bitmaps = g_slist_append(bitmaps, bitmap);
             break;
 
-- 
2.34.1