diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c index f5c0fad3fc..f306ebef72 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -218,12 +218,22 @@ static bool vhost_svq_add_split(VhostShadowVirtqueue *svq, static void vhost_svq_kick(VhostShadowVirtqueue *svq) { + bool needs_kick; + /* * We need to expose the available array entries before checking the used * flags */ smp_mb(); - if (svq->vring.used->flags & VRING_USED_F_NO_NOTIFY) { + + if (virtio_vdev_has_feature(svq->vdev, VIRTIO_RING_F_EVENT_IDX)) { + uint16_t avail_event = *(uint16_t *)(&svq->vring.used->ring[svq->vring.num]); + needs_kick = vring_need_event(avail_event, svq->shadow_avail_idx, svq->shadow_avail_idx - 1); + } else { + needs_kick = !(svq->vring.used->flags & VRING_USED_F_NO_NOTIFY); + } + + if (!needs_kick) { return; }