I have a question about qemu.is it a bug in qemu version 1.2?
in qemu version 1.2 ,it set avail event by the code :
if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
vring_avail_event(vq, vring_avail_idx(vq));
}
and in version 2.7 the code is
if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
vring_set_avail_event(vq, vq->last_avail_idx);
}
a big difference of this is the value.vring_avail_idx(vq)is the latest value of
VRingAvail.idx,and vq->last_avail_idx is not, I think it really different with
the two different values,and I think the later is right,is it??
thanks a lot!!
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