Re: [Qemu-devel] [[RFC v3 03/12] virtio: init memory cache for packed ring

[Jason Wang]

On 2018年10月15日 15:09, Wei Xu wrote:

-hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
+hwaddr virtio_queue_get_driver_size(VirtIODevice *vdev, int n)
  {
-    return offsetof(VRingAvail, ring) +
-        sizeof(uint16_t) * vdev->vq[n].vring.num;
+    int s;
+
+    if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
+        return sizeof(struct VRingPackedDescEvent);
+    } else {
+        s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
+        return offsetof(VRingAvail, ring) +
+            sizeof(uint16_t) * vdev->vq[n].vring.num + s;

I tend to move this to an independent patch.

You mean this two functions?

Wei

I mean moving the adding of event to get_avail()/get_used().

Thanks