[PATCH v11 13/40] virtio_ring: split: reserve vring_align, may_reduce_num

[Jason Wang]

在 2022/6/29 14:56, Xuan Zhuo 写道:
> In vring_create_virtqueue_split() save vring_align, may_reduce_num to
> structure vring_virtqueue_split. Used to create a new vring when
> implementing resize .
>
> Signed-off-by: Xuan Zhuo <xuanzhuo at linux.alibaba.com>


Acked-by: Jason Wang <jasowang at redhat.com>


> ---
>   drivers/virtio/virtio_ring.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 4c8972da5423..9c83c5e6d5a9 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -105,6 +105,13 @@ struct vring_virtqueue_split {
>   	/* DMA address and size information */
>   	dma_addr_t queue_dma_addr;
>   	size_t queue_size_in_bytes;
> +
> +	/*
> +	 * The parameters for creating vrings are reserved for creating new
> +	 * vring.
> +	 */
> +	u32 vring_align;
> +	bool may_reduce_num;
>   };
>   
>   struct vring_virtqueue_packed {
> @@ -1098,6 +1105,8 @@ static struct virtqueue *vring_create_virtqueue_split(
>   		return NULL;
>   	}
>   
> +	to_vvq(vq)->split.vring_align = vring_align;
> +	to_vvq(vq)->split.may_reduce_num = may_reduce_num;
>   	to_vvq(vq)->split.queue_dma_addr = vring.queue_dma_addr;
>   	to_vvq(vq)->split.queue_size_in_bytes = vring.queue_size_in_bytes;
>   	to_vvq(vq)->we_own_ring = true;