From: Jason Wang <jasowang@redhat.com>
Date: Wed, 30 Jan 2013 11:12:36 +0000 (+0800)
Subject: virtio: introduce virtio_del_queue()
X-Git-Tag: TizenStudio_2.0_p2.3.2~208^2~2650
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f23fd811ac4f49f482058cad3b465dc5dc0edc11;p=sdk%2Femulator%2Fqemu.git

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>
---

diff --git a/hw/virtio.c b/hw/virtio.c
index ca170c3..d8c77b0 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);
diff --git a/hw/virtio.h b/hw/virtio.h
index 9cc7b85..d3da1d2 100644
--- a/hw/virtio.h
+++ b/hw/virtio.h
@@ -181,6 +181,8 @@ 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);