[PATCH RFC 2/2] vhost: support urgent descriptors

Paolo Bonzini
Sat, 20 Sep 2014 10:00:27 -0000

Il 19/09/2014 09:10, Jason Wang ha scritto:
>> >
>> > -	if (!vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX)) {
>> > +	if (vq->urgent || !vhost_has_feature(vq,
VIRTIO_RING_F_EVENT_IDX)) {
> So the urgent descriptor only work when event index was not enabled?
> This seems suboptimal, we may still want to benefit from event index
> even if urgent descriptor is used. Looks like we need return true here
> when vq->urgent is true?

Its ||, not &&.

Without event index, all descriptors are treated as urgent.

Paolo