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authorPeter Maydell <peter.maydell@linaro.org>2013-07-16 13:25:07 +0100
committerPeter Maydell <peter.maydell@linaro.org>2013-07-19 12:58:46 +0100
commite63c0ba1bce0b3cc7037c6c2d327267a585534ec (patch)
tree7c6c535f6a0e555b601560e87d0b9148c0bd0faa /hw
parent70976c41c1def9d6e8b664c64cdf83b1ea0daa03 (diff)
virtio: Add support for guest setting of queue size
The MMIO virtio transport spec allows the guest to tell the host how large the queue size is. Add virtio_queue_set_num() function which implements this in the QEMU common virtio support code. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1373977512-28932-4-git-send-email-peter.maydell@linaro.org
Diffstat (limited to 'hw')
-rw-r--r--hw/virtio/virtio.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 8176c147e1..01b05f37e1 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -667,6 +667,14 @@ hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n)
return vdev->vq[n].pa;
}
+void virtio_queue_set_num(VirtIODevice *vdev, int n, int num)
+{
+ if (num <= VIRTQUEUE_MAX_SIZE) {
+ vdev->vq[n].vring.num = num;
+ virtqueue_init(&vdev->vq[n]);
+ }
+}
+
int virtio_queue_get_num(VirtIODevice *vdev, int n)
{
return vdev->vq[n].vring.num;