From patchwork Fri Dec 28 10:31:59 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [07/12] virtio: introduce virtio_queue_del() Date: Fri, 28 Dec 2012 00:31:59 -0000 From: Jason Wang X-Patchwork-Id: 208439 Message-Id: <1356690724-37891-8-git-send-email-jasowang@redhat.com> To: mst@redhat.com, aliguori@us.ibm.com, stefanha@redhat.com, qemu-devel@nongnu.org Cc: krkumar2@in.ibm.com, kvm@vger.kernel.org, mprivozn@redhat.com, Jason Wang , rusty@rustcorp.com.au, jwhan@filewood.snu.ac.kr, shiyer@redhat.com 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 --- hw/virtio.c | 9 +++++++++ hw/virtio.h | 2 ++ 2 files changed, 11 insertions(+), 0 deletions(-) diff --git a/hw/virtio.c b/hw/virtio.c index f40a8c5..bc3c9c3 100644 --- a/hw/virtio.c +++ b/hw/virtio.c @@ -700,6 +700,15 @@ 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 7c17f7b..f6cb0f9 100644 --- a/hw/virtio.h +++ b/hw/virtio.h @@ -138,6 +138,8 @@ 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);