Re: [Qemu-devel] [RFC v2 5/8] virtio: queue pop for packed ring

[Wei Xu]

On Wed, Jun 06, 2018 at 11:41:18AM +0800, Jason Wang wrote:
> 
> 
> On 2018年06月06日 11:38, Wei Xu wrote:
> >>>+
> >>>+    head = vq->last_avail_idx;
> >>>+    i = head;
> >>>+
> >>>+    caches = vring_get_region_caches(vq);
> >>>+    cache = &caches->desc;
> >>>+    vring_packed_desc_read(vdev, &desc, cache, i);
> >>I think we'd better find a way to avoid reading descriptor twice.
> >Do you mean here and the read for empty check?
> >
> >Wei
> >
> 
> Yes.

OK, will figure it out.

> 
> Thanks
> 
>