From: Jason Wang Date: Fri, 24 Aug 2018 08:53:13 +0000 (+0800) Subject: vhost: correctly check the iova range when waking virtqueue X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2d66f997f0545c8f7fc5cf0b49af1decb35170e7;p=linux.git 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: 6b1e6cc7855b ("vhost: new device IOTLB API") Reported-by: Peter Xu Signed-off-by: Jason Wang Reviewed-by: Peter Xu Tested-by: Peter Xu Acked-by: Michael S. Tsirkin Signed-off-by: David S. Miller --- diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 96c1d8400822a..b13c6b4b2c665 100644 --- 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);