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diff --git a/OvmfPkg/Include/Protocol/XenIo.h b/OvmfPkg/Include/Protocol/XenIo.h
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+/** @file
+  XenIo protocol to abstract arch specific details
+
+  The Xen implementations for the Intel and ARM archictures differ in the way
+  the base address of the grant table is communicated to the guest. The former
+  uses a virtual PCI device, while the latter uses a device tree node.
+  In order to allow the XenBusDxe UEFI driver to be reused for the non-PCI
+  Xen implementation, this abstract protocol can be installed on a handle
+  with the appropriate base address.
+
+  Copyright (C) 2014, Linaro Ltd.
+
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __PROTOCOL_XENIO_H__
+#define __PROTOCOL_XENIO_H__
+
+#include <IndustryStandard/Xen/xen.h>
+
+#define XENIO_PROTOCOL_GUID \
+  {0x6efac84f, 0x0ab0, 0x4747, {0x81, 0xbe, 0x85, 0x55, 0x62, 0x59, 0x04, 0x49}}
+
+///
+/// Forward declaration
+///
+typedef struct _XENIO_PROTOCOL XENIO_PROTOCOL;
+
+///
+/// Protocol structure
+///
+struct _XENIO_PROTOCOL {
+  //
+  // Protocol data fields
+  //
+  EFI_PHYSICAL_ADDRESS          GrantTableAddress;
+};
+
+extern EFI_GUID gXenIoProtocolGuid;
+
+#endif