diff --git a/nova/keymgr/conf_key_mgr.py b/nova/keymgr/conf_key_mgr.py
index 97f8a788ec87..a9fe53cf26ff 100644
--- a/nova/keymgr/conf_key_mgr.py
+++ b/nova/keymgr/conf_key_mgr.py
@@ -129,3 +129,13 @@ class ConfKeyManager(key_manager.KeyManager):
                 reason="cannot delete non-existent key")
 
         LOG.warning("Not deleting key %s", managed_object_id)
+
+    def add_consumer(self, context, managed_object_id, consumer_data):
+        raise NotImplementedError(
+            'ConfKeyManager does not implement adding consumers'
+        )
+
+    def remove_consumer(self, context, managed_object_id, consumer_data):
+        raise NotImplementedError(
+            'ConfKeyManager does not implement removing consumers'
+        )
diff --git a/nova/tests/functional/libvirt/test_vtpm.py b/nova/tests/functional/libvirt/test_vtpm.py
index 3b5ae9a60f0d..8c0fd9dbe148 100644
--- a/nova/tests/functional/libvirt/test_vtpm.py
+++ b/nova/tests/functional/libvirt/test_vtpm.py
@@ -109,6 +109,16 @@ class FakeKeyManager(key_manager.KeyManager):
 
         del self._passphrases[managed_object_id]
 
+    def add_consumer(self, context, managed_object_id, consumer_data):
+        raise NotImplementedError(
+            'FakeKeyManager does not implement adding consumers'
+        )
+
+    def remove_consumer(self, context, managed_object_id, consumer_data):
+        raise NotImplementedError(
+            'FakeKeyManager does not implement removing consumers'
+        )
+
 
 class VTPMServersTest(base.ServersTestBase):