diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index 0c4354e..71bf32b 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -230,6 +230,9 @@
      */
     vfio_device_init(vbasedev, VFIO_DEVICE_TYPE_AP, &vfio_ap_ops,
                      DEVICE(vapdev), true);
+
+    /* AP device is mdev type device */
+    vbasedev->mdev = true;
 }
 
 #ifdef CONFIG_IOMMUFD