Currently, we do nothing to prevent the callbacks in virtqueue_disable_cb() when event index is used. This may cause spurious interrupts which may damage the performance. This patch tries to publish last_used_idx as the used even to prevent the callbacks. Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx> --- drivers/virtio/virtio_ring.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 096b857..a83aebc 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -538,6 +538,7 @@ void virtqueue_disable_cb(struct virtqueue *_vq) struct vring_virtqueue *vq = to_vvq(_vq); vq->vring.avail->flags |= cpu_to_virtio16(_vq->vdev, VRING_AVAIL_F_NO_INTERRUPT); + vring_used_event(&vq->vring) = cpu_to_virtio16(_vq->vdev, vq->last_used_idx); } EXPORT_SYMBOL_GPL(virtqueue_disable_cb); -- 1.8.3.1 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
