Commit 2d66f997 authored Aug 24, 2018 by Jason Wang Committed by David S. Miller Aug 25, 2018

vhost: correctly check the iova range when waking virtqueue



We don't wakeup the virtqueue if the first byte of pending iova range
is the last byte of the range we just got updated. This will lead a
virtqueue to wait for IOTLB updating forever. Fixing by correct the
check and wake up the virtqueue in this case.

Fixes: 6b1e6cc7 ("vhost: new device IOTLB API")
Reported-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Tested-by: Peter Xu <peterx@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 6750c870

drivers/vhost/vhost.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -952,7 +952,7 @@ static void vhost_iotlb_notify_vq(struct vhost_dev *d,
		list_for_each_entry_safe(node, n, &d->pending_list, node) {
		struct vhost_iotlb_msg *vq_msg = &node->msg.iotlb;
		if (msg->iova <= vq_msg->iova &&
		msg->iova + msg->size - 1 > vq_msg->iova &&
		msg->iova + msg->size - 1 >= vq_msg->iova &&
		vq_msg->type == VHOST_IOTLB_MISS) {
		vhost_poll_queue(&node->vq->poll);
		list_del(&node->node);