virtio: add virtio_queue_get_id
Serializing virtio-scsi requests needs a simple way to get from a
VirtQueue to the number of the queue. The virtio_queue_get_id
provides this.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/hw/virtio.c b/hw/virtio.c
index 064aecf..314abf8 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -624,6 +624,13 @@
return vdev->vq[n].vring.num;
}
+int virtio_queue_get_id(VirtQueue *vq)
+{
+ VirtIODevice *vdev = vq->vdev;
+ assert(vq >= &vdev->vq[0] && vq < &vdev->vq[VIRTIO_PCI_QUEUE_MAX]);
+ return vq - &vdev->vq[0];
+}
+
void virtio_queue_notify_vq(VirtQueue *vq)
{
if (vq->vring.desc) {
