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virtio_ring: packed: introduce virtqueue_reinit_packed()

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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: <20220801063902.129329-23-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xuan Zhuo 2022-08-01 14:38:42 +08:00 committed by Michael S. Tsirkin
parent 51d649f14a
commit 56775e141b
1 changed files with 12 additions and 0 deletions
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12
drivers/virtio/virtio_ring.c
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@ -1957,6 +1957,18 @@ static void virtqueue_vring_attach_packed(struct vring_virtqueue *vq,
vq->free_head = 0;
}
static void virtqueue_reinit_packed(struct vring_virtqueue *vq)
{
memset(vq->packed.vring.device, 0, vq->packed.event_size_in_bytes);
memset(vq->packed.vring.driver, 0, vq->packed.event_size_in_bytes);
/* we need to reset the desc.flags. For more, see is_used_desc_packed() */
memset(vq->packed.vring.desc, 0, vq->packed.ring_size_in_bytes);
virtqueue_init(vq, vq->packed.vring.num);
virtqueue_vring_init_packed(&vq->packed, !!vq->vq.callback);
}
static struct virtqueue *vring_create_virtqueue_packed(
unsigned int index,
unsigned int num,