vhost: expose vhost_virtqueue_start()

Expose vhost_virtqueue_start(), we need to use it when restarting a
virtqueue.

Signed-off-by: Kangjie Xu <kangjie.xu@linux.alibaba.com>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20221017092558.111082-8-xuanzhuo@linux.alibaba.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/virtio/vhost.c

@@ -1081,10 +1081,10 @@ out:
     return ret;
 }
 
-static int vhost_virtqueue_start(struct vhost_dev *dev,
-                                struct VirtIODevice *vdev,
-                                struct vhost_virtqueue *vq,
-                                unsigned idx)
+int vhost_virtqueue_start(struct vhost_dev *dev,
+                          struct VirtIODevice *vdev,
+                          struct vhost_virtqueue *vq,
+                          unsigned idx)
 {
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
     VirtioBusState *vbus = VIRTIO_BUS(qbus);

include/hw/virtio/vhost.h

@@ -297,6 +297,9 @@ int vhost_net_set_backend(struct vhost_dev *hdev,
 
 int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write);
 
+int vhost_virtqueue_start(struct vhost_dev *dev, struct VirtIODevice *vdev,
+                          struct vhost_virtqueue *vq, unsigned idx);
+
 void vhost_dev_reset_inflight(struct vhost_inflight *inflight);
 void vhost_dev_free_inflight(struct vhost_inflight *inflight);
 void vhost_dev_save_inflight(struct vhost_inflight *inflight, QEMUFile *f);