vhost-user-blk: Only start vhost-user backend with the first kick

We should only start vhost-user backend at the first kick for
virtio 1.0 transitional devices.

Signed-off-by: Xie Yongji <xieyongji@baidu.com>
Signed-off-by: Zhang Yu <zhangyu31@baidu.com>
Message-Id: <20190320112646.3712-5-xieyongji@baidu.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index 700c1dd1114ebcd00cebb35fdbc23c13cd1237f9..39e1adc60ac85fac8c63db9bf1e8ae6549ea3081 100644 (file)
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -239,8 +239,7 @@ static void vhost_user_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
     int i;
 
-    if (!(virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1) &&
-        !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1))) {
+    if (!vdev->start_on_kick) {
         return;
     }