[Qemu-devel] [PATCH v4 4/5] vhost: send SET_PROTOCOL_FEATURES at start

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

So that the backend can restore the protocol features after a reset.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---
 hw/virtio/vhost.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index de29968..be48511 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1195,6 +1195,14 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
     if (r < 0) {
         goto fail_features;
     }
+    if (hdev->vhost_ops->vhost_set_protocol_features) {
+        r = hdev->vhost_ops->vhost_set_protocol_features(hdev,
+                hdev->protocol_features);
+        if (r < 0) {
+            goto fail_features;
+        }
+    }
+
     r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem);
     if (r < 0) {
         r = -errno;
-- 
1.9.0