Commit 56775e14 authored by Xuan Zhuo's avatar Xuan Zhuo Committed by Michael S. Tsirkin
Browse files

virtio_ring: packed: introduce virtqueue_reinit_packed() 



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: <20220801063902.129329-23-xuanzhuo@linux.alibaba.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 51d649f1

drivers/virtio/virtio_ring.c

+12 −0
Original line number Diff line number Diff line
@@ -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,