hw/uefi: flush variable store to disk in post load

Make live migration more robust.  Commit 4c0cfc7 ("pflash_cfi01:
write flash contents to bdrv on incoming migration") elaborates in
detail on the motivation.

Cc: Peter Krempa <[email protected]>
Reviewed-by: Peter Krempa <[email protected]>
Signed-off-by: Gerd Hoffmann <[email protected]>
Message-ID: <[email protected]>

Author: kraxel

hw/uefi/var-service-core.c

@@ -29,6 +29,7 @@ static int uefi_vars_post_load(void *opaque, int version_id)
     uefi_vars_state *uv = opaque;
 
     uefi_vars_update_storage(uv);
+    uefi_vars_json_save(uv);
     uv->buffer = g_malloc(uv->buf_size);
     return 0;
 }