[PATCH 10/16] vhost: extract the logic of unmapping the vrings and desc

[Kangjie Xu <kangjie.xu@linux.alibaba.com>]

Introduce vhost_virtqueue_unmap() to ummap the vrings and desc
of a virtqueue.

The function will be used later.

Signed-off-by: Kangjie Xu <kangjie.xu@linux.alibaba.com>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 hw/virtio/vhost.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 0827d631c0..e467dfc7bc 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1197,6 +1197,19 @@ fail_alloc_desc:
     return r;
 }
 
+static void vhost_virtqueue_unmap(struct vhost_dev *dev,
+                                  struct VirtIODevice *vdev,
+                                  struct vhost_virtqueue *vq,
+                                  unsigned idx)
+{
+    vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx),
+                       1, virtio_queue_get_used_size(vdev, idx));
+    vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx),
+                       0, virtio_queue_get_avail_size(vdev, idx));
+    vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx),
+                       0, virtio_queue_get_desc_size(vdev, idx));
+}
+
 static void vhost_virtqueue_stop(struct vhost_dev *dev,
                                     struct VirtIODevice *vdev,
                                     struct vhost_virtqueue *vq,
@@ -1235,12 +1248,7 @@ static void vhost_virtqueue_stop(struct vhost_dev *dev,
                                                 vhost_vq_index);
     }
 
-    vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx),
-                       1, virtio_queue_get_used_size(vdev, idx));
-    vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx),
-                       0, virtio_queue_get_avail_size(vdev, idx));
-    vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx),
-                       0, virtio_queue_get_desc_size(vdev, idx));
+    vhost_virtqueue_unmap(dev, vdev, vq, idx);
 }
 
 static void vhost_eventfd_add(MemoryListener *listener,
-- 
2.32.0