diff --git a/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/SynchronizedReadWrite.aidl b/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/SynchronizedReadWrite.aidl
new file mode 100644
index 0000000..aec3d6d
--- /dev/null
+++ b/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/SynchronizedReadWrite.aidl
@@ -0,0 +1,22 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
+// edit this file. It looks like you are doing that because you have modified
+// an AIDL interface in a backward-incompatible way, e.g., deleting a function
+// from an interface or a field from a parcelable and it broke the build. That
+// breakage is intended.
+//
+// You must not make a backward incompatible changes to the AIDL files built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.common;
+@VintfStability
+enum SynchronizedReadWrite {
+  EMPTY = 0,
+}
diff --git a/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/UnsynchronizedWrite.aidl b/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/UnsynchronizedWrite.aidl
new file mode 100644
index 0000000..e390d20
--- /dev/null
+++ b/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/UnsynchronizedWrite.aidl
@@ -0,0 +1,22 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
+// edit this file. It looks like you are doing that because you have modified
+// an AIDL interface in a backward-incompatible way, e.g., deleting a function
+// from an interface or a field from a parcelable and it broke the build. That
+// breakage is intended.
+//
+// You must not make a backward incompatible changes to the AIDL files built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.common;
+@VintfStability
+enum UnsynchronizedWrite {
+  EMPTY = 0,
+}
diff --git a/common/aidl/android/hardware/common/MQDescriptor.aidl b/common/aidl/android/hardware/common/MQDescriptor.aidl
index 8997688..7e89b15 100644
--- a/common/aidl/android/hardware/common/MQDescriptor.aidl
+++ b/common/aidl/android/hardware/common/MQDescriptor.aidl
@@ -22,9 +22,12 @@
  * For use with libfmq. This is created from an instance of AidlMessageQueue,
  * and is used to pass information required to create another instance of that
  * queue for fast communication.
+ * T - is used to specify the type of the payload
+ * Flavor - is used to specify the type of the queue using
+ * android.hardware.common.SynchronizedReadWrite or UnsynchronizedWrite
  */
 @VintfStability
-parcelable MQDescriptor {
+parcelable MQDescriptor<T, Flavor> {
     /*
      * Describes each of the grantors for the message queue. They are used to
      * get the readptr, writeptr, dataptr, and the optional EventFlag word
diff --git a/common/aidl/android/hardware/common/SynchronizedReadWrite.aidl b/common/aidl/android/hardware/common/SynchronizedReadWrite.aidl
new file mode 100644
index 0000000..ef93bf2
--- /dev/null
+++ b/common/aidl/android/hardware/common/SynchronizedReadWrite.aidl
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2020 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.hardware.common;
+
+/*
+ * For use with android.hardware.common.MQDescriptor to specify which type of
+ * queue to use. SynchronizedReadWrite is single reader, single writer, with no
+ * overflow. All messages written need to be read.
+ */
+@VintfStability
+enum SynchronizedReadWrite {
+    EMPTY,
+}
diff --git a/common/aidl/android/hardware/common/UnsynchronizedWrite.aidl b/common/aidl/android/hardware/common/UnsynchronizedWrite.aidl
new file mode 100644
index 0000000..aa27c8d
--- /dev/null
+++ b/common/aidl/android/hardware/common/UnsynchronizedWrite.aidl
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2020 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.hardware.common;
+
+/*
+ * For use with android.hardware.common.MQDescriptor to specify which type of
+ * queue to use. UnsynchronizedWrite is single writer, multiple reader, with
+ * overflow. If messages are not read fast enough, they can be overwritten.
+ */
+@VintfStability
+enum UnsynchronizedWrite {
+    EMPTY,
+}