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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: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-15-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xuan Zhuo 2022-08-01 14:38:34 +08:00 committed by Michael S. Tsirkin
parent e1d6a423ea
commit e5175b419a
1 changed files with 23 additions and 0 deletions
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23
drivers/virtio/virtio_ring.c
View File

@ -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)
{