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: ac35b12314c7 ("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>

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 96c1d8400822a3d852553e5baddaaed9907d7f71..b13c6b4b2c665a332a40aeada1eaa1e421d9a4aa 100644 (file)
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -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);