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

[Jason Wang]

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.

Thanks