[PATCH v2 10/24] vhost: introduce vhost_dev_virtqueue_restart()

[Kangjie Xu]

Introduce vhost_dev_virtqueue_restart(), which can restart the
virtqueue when the vhost has already started running.

Signed-off-by: Kangjie Xu <kangjie.xu@linux.alibaba.com>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 hw/virtio/vhost.c         | 13 +++++++++++++
 include/hw/virtio/vhost.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 1bca9ff48d..fc3f550c76 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1913,3 +1913,16 @@ void vhost_dev_virtqueue_stop(struct vhost_dev *hdev, 
VirtIODevice *vdev,
                           hdev->vqs + idx,
                           idx);
 }
+
+int vhost_dev_virtqueue_restart(struct vhost_dev *hdev, VirtIODevice *vdev,
+                                int idx)
+{
+    const VhostOps *vhost_ops = hdev->vhost_ops;
+
+    assert(vhost_ops);
+
+    return vhost_virtqueue_start(hdev,
+                                 vdev,
+                                 hdev->vqs + idx,
+                                 hdev->vq_index + idx);
+}
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 574888440c..b3394b6348 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -291,4 +291,6 @@ int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t 
queue_size,
 
 void vhost_dev_virtqueue_stop(struct vhost_dev *hdev, VirtIODevice *vdev,
                               int idx);
+int vhost_dev_virtqueue_restart(struct vhost_dev *hdev, VirtIODevice *vdev,
+                                int idx);
 #endif
-- 
2.32.0