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