void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
{
- /* Always notify when queue is empty */
- if ((vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx) &&
- (vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT))
+ /* Always notify when queue is empty (when feature acknowledge) */
+ if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
+ (!(vdev->features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
+ (vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx)))
return;
vdev->isr |= 0x01;