virtio: introduce virtio_del_queue()

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>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/hw/virtio.c b/hw/virtio.c
index ca170c319e..d8c77b054d 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -701,6 +701,15 @@ 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);