On Fri, Jul 12, 2013 at 09:36:57PM +0100, Peter Maydell wrote:
> 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@xxxxxxxxxx>
Probably needs to go back to default value on reset?
Need to migrate?
Is the default value a max legal value? If yes probably a good
idea to enforce this.
> ---
> hw/virtio/virtio.c | 8 ++++++++
> include/hw/virtio/virtio.h | 1 +
> 2 files changed, 9 insertions(+)
>
> diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
> index 8176c14..01b05f3 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;
> diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
> index a6c5c53..95c4772 100644
> --- a/include/hw/virtio/virtio.h
> +++ b/include/hw/virtio/virtio.h
> @@ -198,6 +198,7 @@ void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
> void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
> void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
> hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
> +void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
> int virtio_queue_get_num(VirtIODevice *vdev, int n);
> void virtio_queue_notify(VirtIODevice *vdev, int n);
> uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
> --
> 1.7.9.5
>
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