Update vhost_net_virtqueue_restart() for vhost-user scenario.

In order to reuse some functions, we process the idx for
vhost-user case. It is because vhost_get_vq_index behave
differently in vhost-user.

Signed-off-by: Kangjie Xu <kangjie.xu@linux.alibaba.com>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 hw/net/vhost_net.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 25e5665489..8b80942e7c 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -577,6 +577,9 @@ int vhost_net_virtqueue_restart(VirtIODevice *vdev, NetClientState *nc,
     assert(vhost_ops);
 
     idx = vhost_ops->vhost_get_vq_index(&net->dev, vq_index);
+    if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
+        idx -= net->dev.vq_index;
+    }
 
     r = vhost_virtqueue_start(&net->dev,
                               vdev,
-- 
2.32.0