diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 082380c03a3e..1768362115c6 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1170,7 +1170,9 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
 		goto done;
 	}
 
-	if (msg.size == 0) {
+	if ((msg.type == VHOST_IOTLB_UPDATE ||
+	     msg.type == VHOST_IOTLB_INVALIDATE) &&
+	     msg.size == 0) {
 		ret = -EINVAL;
 		goto done;
 	}