@@ -190,7 +190,18 @@ static void virtio_balloon_set_config(VirtIODevice *vdev,
static uint32_t virtio_balloon_get_features(VirtIODevice *vdev, uint32_t f)
- f |= (1 << VIRTIO_BALLOON_F_STATS_VQ);
+ * The addition of memory stats reporting to the virtio balloon causes
+ * the 'info balloon' command to become asynchronous. This is a regression
+ * because management tools that consume this command were not designed to
+ * handle lost or delayed responses.
+ * To fix this regression, the virtio balloon memory stats feature is being
+ * disabled in qemu-0.13.
+ * -aglitke
+ /* f |= (1 << VIRTIO_BALLOON_F_STATS_VQ); */