From c80decdbd9ea679a17f6b0202ea1df0f840e4828 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 6 Apr 2012 10:38:37 +0200
Subject: 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>
---
 hw/virtio.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'hw/virtio.c')

diff --git a/hw/virtio.c b/hw/virtio.c
index 064aecf553..314abf8a18 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -624,6 +624,13 @@ int virtio_queue_get_num(VirtIODevice *vdev, int n)
     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) {
-- 
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