Commit e5175b41 authored by Xuan Zhuo's avatar Xuan Zhuo Committed by Michael S. Tsirkin
Browse files

virtio_ring: split: introduce virtqueue_reinit_split() 



Introduce a function to initialize vq without allocating new ring,
desc_state, desc_extra.

Subsequent patches will call this function after reset vq to
reinitialize vq.

Signed-off-by: default avatarXuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-15-xuanzhuo@linux.alibaba.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent e1d6a423

drivers/virtio/virtio_ring.c

+23 −0
Original line number Diff line number Diff line
@@ -957,6 +957,29 @@ static void virtqueue_vring_init_split(struct vring_virtqueue_split *vring_split 
	}

}



static void virtqueue_reinit_split(struct vring_virtqueue *vq)

{

	int num;



	num = vq->split.vring.num;



	vq->split.vring.avail->flags = 0;

	vq->split.vring.avail->idx = 0;



	/* reset avail event */

	vq->split.vring.avail->ring[num] = 0;



	vq->split.vring.used->flags = 0;

	vq->split.vring.used->idx = 0;



	/* reset used event */

	*(__virtio16 *)&(vq->split.vring.used->ring[num]) = 0;



	virtqueue_init(vq, num);



	virtqueue_vring_init_split(&vq->split, vq);

}



static void virtqueue_vring_attach_split(struct vring_virtqueue *vq,

					 struct vring_virtqueue_split *vring_split)

{