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 | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 8ad5743f7c..13b9c11e68 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -563,6 +563,9 @@ 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,
@@ -572,6 +575,15 @@ int vhost_net_virtqueue_restart(VirtIODevice *vdev, NetClientState *nc,
         goto err_start;
     }
 
+    if (vhost_ops->vhost_set_vring_enable) {
+        r = vhost_ops->vhost_set_vring_enable(&net->dev,
+                                              net->dev.vq_index + idx,
+                                              1);
+        if (r < 0) {
+            goto err_start;
+        }
+    }
+
     if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
         file.index = idx;
         file.fd = net->backend;
-- 
2.32.0