+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Synchronize the available ring from guest to mediated ring, help to
+ * check desc validity to protect against malicious guest driver.
+ *
+ * @param vid
+ * vhost device id
+ * @param qid
+ * vhost queue id
+ * @param vring_m
+ * mediated virtio ring pointer
+ * @return
+ * number of synced available entries on success, -1 on failure
+ */
+int __rte_experimental
+rte_vdpa_relay_vring_avail(int vid, uint16_t qid, void *vring_m);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Synchronize the used ring from mediated ring to guest, log dirty
+ * page for each writeable buffer, caller should handle the used
+ * ring logging before device stop.
+ *
+ * @param vid
+ * vhost device id
+ * @param qid
+ * vhost queue id
+ * @param vring_m
+ * mediated virtio ring pointer
+ * @return
+ * number of synced used entries on success, -1 on failure
+ */
+int __rte_experimental
+rte_vdpa_relay_vring_used(int vid, uint16_t qid, void *vring_m);