diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 7e24b2b69a..b21e5c2b9d 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -171,6 +171,18 @@ typedef struct VirtioDeviceClass {
     void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
     void (*reset)(VirtIODevice *vdev);
     void (*set_status)(VirtIODevice *vdev, uint8_t val);
+    /* Test and clear event pending status.
+     * Should be called after unmask to avoid losing events.
+     * If backend does not support masking,
+     * must check in frontend instead.
+     */
+    bool (*guest_notifier_pending)(VirtIODevice *vdev, int n);
+    /* Mask/unmask events from this vq. Any events reported
+     * while masked will become pending.
+     * If backend does not support masking,
+     * must mask in frontend instead.
+     */
+    void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask);
 } VirtioDeviceClass;
 
 void virtio_init(VirtIODevice *vdev, const char *name,