diff --git a/virtualizationservice/aidl/Android.bp b/virtualizationservice/aidl/Android.bp
index 7d85bd3..974bdc6 100644
--- a/virtualizationservice/aidl/Android.bp
+++ b/virtualizationservice/aidl/Android.bp
@@ -4,7 +4,7 @@
 
 aidl_interface {
     name: "android.system.virtualizationservice",
-    srcs: ["**/*.aidl"],
+    srcs: ["android/system/virtualizationservice/**/*.aidl"],
     // This is never accessed directly. Apps are expected to use this indirectly via the Java
     // wrapper android.system.virtualmachine.
     unstable: true,
@@ -27,3 +27,15 @@
         },
     },
 }
+
+aidl_interface {
+    name: "android.system.virtualmachineservice",
+    srcs: ["android/system/virtualmachineservice/**/*.aidl"],
+    unstable: true,
+    backend: {
+        rust: {
+            enabled: true,
+            apex_available: ["com.android.virt"],
+        },
+    },
+}
diff --git a/virtualizationservice/aidl/android/system/virtualmachineservice/IVirtualMachineService.aidl b/virtualizationservice/aidl/android/system/virtualmachineservice/IVirtualMachineService.aidl
new file mode 100644
index 0000000..b5cda7d
--- /dev/null
+++ b/virtualizationservice/aidl/android/system/virtualmachineservice/IVirtualMachineService.aidl
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.system.virtualmachineservice;
+
+/** {@hide} */
+interface IVirtualMachineService {
+    /**
+     * Notifies that the virtual machine is ready.
+     * TODO(b/191845268): remove cid parameter
+     */
+    void notifyPayloadStarted(int cid);
+}