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virtio: introduce virtio_del_queue()

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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>
This commit is contained in:
Jason Wang 2013-01-30 19:12:36 +08:00 committed by Anthony Liguori
parent a9f98bb5eb
commit f23fd811ac
2 changed files with 11 additions and 0 deletions
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9
hw/virtio.c
View File

@ -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);

2
hw/virtio.h
View File

@ -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);