[Qemu-devel] [PATCH 07/12] virtio: introduce virtio_queue_del()

[Jason Wang <jasowang@redhat.com>]

Some device (such as virtio-net) needs the ability to destroy or re-order the
virtqueues, this patch adds a helper to do this.

Signed-off-by: Jason Wang <jasowang>
---
 hw/virtio.c |    9 +++++++++
 hw/virtio.h |    2 ++
 2 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/hw/virtio.c b/hw/virtio.c
index f40a8c5..bc3c9c3 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -700,6 +700,15 @@ VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
     return &vdev->vq[i];
 }
 
+void virtio_del_queue(VirtIODevice *vdev, int n)
+{
+    if (n < 0 || n >= VIRTIO_PCI_QUEUE_MAX) {
+        abort();
+    }
+
+    vdev->vq[n].vring.num = 0;
+}
+
 void virtio_irq(VirtQueue *vq)
 {
     trace_virtio_irq(vq);
diff --git a/hw/virtio.h b/hw/virtio.h
index 7c17f7b..f6cb0f9 100644
--- a/hw/virtio.h
+++ b/hw/virtio.h
@@ -138,6 +138,8 @@ VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
                             void (*handle_output)(VirtIODevice *,
                                                   VirtQueue *));
 
+void virtio_del_queue(VirtIODevice *vdev, int n);
+
 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
                     unsigned int len);
 void virtqueue_flush(VirtQueue *vq, unsigned int count);
-- 
1.7.1