diff --git a/common/fmq/aidl/Android.bp b/common/fmq/aidl/Android.bp
index 004adab..9389712 100644
--- a/common/fmq/aidl/Android.bp
+++ b/common/fmq/aidl/Android.bp
@@ -9,6 +9,9 @@
     srcs: [
         "android/hardware/common/fmq/*.aidl",
     ],
+    imports: [
+        "android.hardware.common",
+    ],
     stability: "vintf",
     backend: {
         java: {
diff --git a/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/GrantorDescriptor.aidl b/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/GrantorDescriptor.aidl
index 7ac1930..0327796 100644
--- a/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/GrantorDescriptor.aidl
+++ b/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/GrantorDescriptor.aidl
@@ -2,13 +2,14 @@
 // 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.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file 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
@@ -18,6 +19,7 @@
 package android.hardware.common.fmq;
 @VintfStability
 parcelable GrantorDescriptor {
+  int fdIndex;
   int offset;
   long extent;
 }
diff --git a/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/MQDescriptor.aidl b/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/MQDescriptor.aidl
index 2607369..56f1de3 100644
--- a/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/MQDescriptor.aidl
+++ b/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/MQDescriptor.aidl
@@ -2,13 +2,14 @@
 // 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.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file 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
@@ -19,7 +20,7 @@
 @VintfStability
 parcelable MQDescriptor {
   android.hardware.common.fmq.GrantorDescriptor[] grantors;
-  ParcelFileDescriptor fileDescriptor;
+  android.hardware.common.NativeHandle handle;
   int quantum;
   int flags;
 }
diff --git a/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/SynchronizedReadWrite.aidl b/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/SynchronizedReadWrite.aidl
index 2142bdb..264171d 100644
--- a/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/SynchronizedReadWrite.aidl
+++ b/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/SynchronizedReadWrite.aidl
@@ -2,13 +2,14 @@
 // 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.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file 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
diff --git a/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/UnsynchronizedWrite.aidl b/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/UnsynchronizedWrite.aidl
index 1220674..eaf2ffd 100644
--- a/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/UnsynchronizedWrite.aidl
+++ b/common/fmq/aidl/aidl_api/android.hardware.common.fmq/current/android/hardware/common/fmq/UnsynchronizedWrite.aidl
@@ -2,13 +2,14 @@
 // 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.
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
 //
-// You must not make a backward incompatible changes to the AIDL files built
+// You must not make a backward incompatible change to any AIDL file 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
diff --git a/common/fmq/aidl/android/hardware/common/fmq/GrantorDescriptor.aidl b/common/fmq/aidl/android/hardware/common/fmq/GrantorDescriptor.aidl
index ca69d94..672415e 100644
--- a/common/fmq/aidl/android/hardware/common/fmq/GrantorDescriptor.aidl
+++ b/common/fmq/aidl/android/hardware/common/fmq/GrantorDescriptor.aidl
@@ -22,6 +22,10 @@
 @VintfStability
 parcelable GrantorDescriptor {
     /*
+     * Index of file descriptor for this grantor
+     */
+    int fdIndex;
+    /*
      * The offset of this descriptor in the shared memory in bytes.
      */
     int offset;
diff --git a/common/fmq/aidl/android/hardware/common/fmq/MQDescriptor.aidl b/common/fmq/aidl/android/hardware/common/fmq/MQDescriptor.aidl
index 82917d6..46622f0 100644
--- a/common/fmq/aidl/android/hardware/common/fmq/MQDescriptor.aidl
+++ b/common/fmq/aidl/android/hardware/common/fmq/MQDescriptor.aidl
@@ -16,6 +16,7 @@
 
 package android.hardware.common.fmq;
 
+import android.hardware.common.NativeHandle;
 import android.hardware.common.fmq.GrantorDescriptor;
 
 /*
@@ -34,8 +35,11 @@
      * for blocking operations in the shared memory.
      */
     GrantorDescriptor[] grantors;
-    /* File descriptor for shared memory used in the message queue */
-    ParcelFileDescriptor fileDescriptor;
+    /*
+     * NativeHandle that contains the file descriptors for shared memory used
+     * in the message queue
+     */
+    NativeHandle handle;
     /* Size of each item, T, in bytes */
     int quantum;
     /* EventFlag word for blocking operations */
diff --git a/tests/msgq/1.0/ITestMsgQ.hal b/tests/msgq/1.0/ITestMsgQ.hal
index bd10237..0cf9c7c 100644
--- a/tests/msgq/1.0/ITestMsgQ.hal
+++ b/tests/msgq/1.0/ITestMsgQ.hal
@@ -41,12 +41,15 @@
      *
      * @param configureFmq The server sets up a new unsynchronized FMQ if
      * this parameter is true.
+     * @param userFd True to initialize the message queue with a user supplied
+     * file descriptor for the ring buffer.
+     * False to let the message queue use a single FD for everything.
      *
      * @return ret True if successful.
      * @return mqDesc This structure describes the unsynchronized FMQ that was
      * set up by the service. Client can use it to set up the FMQ at its end.
      */
-    getFmqUnsyncWrite(bool configureFmq) generates(bool ret, fmq_unsync<int32_t> mqDesc);
+    getFmqUnsyncWrite(bool configureFmq, bool userFd) generates(bool ret, fmq_unsync<int32_t> mqDesc);
 
     /**
      * This method request the service to write into the synchronized read/write
diff --git a/tests/msgq/1.0/default/Android.bp b/tests/msgq/1.0/default/Android.bp
index 6e7cd44..a50206b 100644
--- a/tests/msgq/1.0/default/Android.bp
+++ b/tests/msgq/1.0/default/Android.bp
@@ -91,9 +91,10 @@
     // These are static libs only for testing purposes and portability. Shared
     // libs should be used on device.
     static_libs: [
+        "android.hardware.common-unstable-ndk_platform",
+        "android.hardware.common.fmq-unstable-ndk_platform",
         "android.hardware.tests.msgq@1.0",
         "android.fmq.test-ndk_platform",
-        "android.hardware.common.fmq-unstable-ndk_platform",
     ],
     whole_static_libs: [
         "android.hardware.tests.msgq@1.0-impl",
diff --git a/tests/msgq/1.0/default/TestMsgQ.cpp b/tests/msgq/1.0/default/TestMsgQ.cpp
index 4473737..4726ffe 100644
--- a/tests/msgq/1.0/default/TestMsgQ.cpp
+++ b/tests/msgq/1.0/default/TestMsgQ.cpp
@@ -41,10 +41,19 @@
     return true;
 }
 
-Return<void> TestMsgQ::getFmqUnsyncWrite(bool configureFmq, getFmqUnsyncWrite_cb _hidl_cb) {
+Return<void> TestMsgQ::getFmqUnsyncWrite(bool configureFmq, bool userFd,
+                                         getFmqUnsyncWrite_cb _hidl_cb) {
     if (configureFmq) {
         static constexpr size_t kNumElementsInQueue = 1024;
-        mFmqUnsynchronized.reset(new (std::nothrow) MessageQueueUnsync(kNumElementsInQueue));
+        static constexpr size_t kElementSizeBytes = sizeof(int32_t);
+        android::base::unique_fd ringbufferFd;
+        if (userFd) {
+            ringbufferFd.reset(
+                    ::ashmem_create_region("UnsyncWrite", kNumElementsInQueue * kElementSizeBytes));
+        }
+        mFmqUnsynchronized.reset(new (std::nothrow) MessageQueueUnsync(
+                kNumElementsInQueue, false, std::move(ringbufferFd),
+                kNumElementsInQueue * kElementSizeBytes));
     }
     if ((mFmqUnsynchronized == nullptr) ||
         (mFmqUnsynchronized->isValid() == false)) {
diff --git a/tests/msgq/1.0/default/TestMsgQ.h b/tests/msgq/1.0/default/TestMsgQ.h
index 8a204b7..49675fe 100644
--- a/tests/msgq/1.0/default/TestMsgQ.h
+++ b/tests/msgq/1.0/default/TestMsgQ.h
@@ -56,7 +56,8 @@
 
     // Methods from ::android::hardware::tests::msgq::V1_0::ITestMsgQ follow.
     Return<bool> configureFmqSyncReadWrite(const MQDescriptorSync<int32_t>& mqDesc) override;
-    Return<void> getFmqUnsyncWrite(bool configureFmq, getFmqUnsyncWrite_cb _hidl_cb) override;
+    Return<void> getFmqUnsyncWrite(bool configureFmq, bool userFd,
+                                   getFmqUnsyncWrite_cb _hidl_cb) override;
     Return<bool> requestWriteFmqSync(int32_t count) override;
     Return<bool> requestReadFmqSync(int32_t count) override;
     Return<bool> requestWriteFmqUnsync(int32_t count) override;