diff --git a/MdeModulePkg/Include/Guid/VariableFlashInfo.h b/MdeModulePkg/Include/Guid/VariableFlashInfo.h
new file mode 100644
index 0000000000..992a0dcdd3
--- /dev/null
+++ b/MdeModulePkg/Include/Guid/VariableFlashInfo.h
@@ -0,0 +1,111 @@
+/** @file
+  This file defines the GUID and data structure used to pass information about
+  a variable store mapped on flash (i.e. a MMIO firmware volume) to the modules
+  that consume that information such as the DXE and MM UEFI variable drivers.
+
+  The HOB described in this file is currently optional. It is primarily provided
+  to allow a platform to dynamically describe the flash information to environments
+  such as Standalone MM that cannot access the prior method using dynamic PCDs.
+
+  Even for platforms that use Standalone MM, if the information is only stored
+  statically such as with FixedAtBuild PCDs, the HOB is not required.
+
+  Every point of consumption in this package that uses the PCDs will first check
+  for the HOB and use its value if present.
+
+  Early modules such as the PEI UEFI variable driver might also consume this
+  information. For modules such as these, that execute early in the boot flow,
+  at least two approaches are possible depending on platform design.
+
+  1. If the information in the HOB exactly matches the information in the PCDs,
+     (i.e. the HOB values are set using the PCD values), let the driver read
+     the information from the PCD and produce the HOB later in boot.
+
+  2. Produce the HOB very early in boot. For example, the earliest point the HOB
+     is currently consumed is in FaultTolerantWritePei. Note that FaultTolerantWritePei
+     produces gEdkiiFaultTolerantWriteGuid which is a dependency for VariablePei.
+
+     Therefore, attaching a NULL class library to FaultTolerantWritePei with a
+     constructor that produces the HOB will guarantee it is produced before the first
+     point of consumption as the constructor is executed before the module entry point.
+
+  Copyright (c) Microsoft Corporation.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef VARIABLE_FLASH_INFO_H_
+#define VARIABLE_FLASH_INFO_H_
+
+#define VARIABLE_FLASH_INFO_HOB_GUID \
+  { 0x5d11c653, 0x8154, 0x4ac3, { 0xa8, 0xc2, 0xfb, 0xa2, 0x89, 0x20, 0xfc, 0x90 }}
+
+#define VARIABLE_FLASH_INFO_HOB_VERSION  1
+
+extern EFI_GUID  gVariableFlashInfoHobGuid;
+
+#pragma pack (push, 1)
+
+///
+/// This structure can be used to describe UEFI variable
+/// flash information.
+///
+typedef struct {
+  ///
+  /// Version of this structure.
+  ///
+  /// Increment the value when the structure is modified.
+  ///
+  UINT32                  Version;
+  ///
+  /// Reserved field.
+  ///
+  /// Currently reserved for natural alignment.
+  ///
+  UINT32                  Reserved;
+  ///
+  /// Base address of the non-volatile variable range in the flash device.
+  ///
+  /// Note that this address should align with the block size requirements of the flash device.
+  ///
+  EFI_PHYSICAL_ADDRESS    NvVariableBaseAddress;
+  ///
+  /// Size of the non-volatile variable range in the flash device.
+  ///
+  /// Note that this value should be less than or equal to FtwSpareLength to support reclaim of
+  /// entire variable store area.
+  /// Note that this address should align with the block size requirements of the flash device.
+  ///
+  UINT64                  NvVariableLength;
+  ///
+  /// Base address of the FTW spare block range in the flash device.
+  ///
+  /// Note that this address should align with the block size requirements of the flash device.
+  ///
+  EFI_PHYSICAL_ADDRESS    FtwSpareBaseAddress;
+  ///
+  /// Size of the FTW spare block range in the flash device.
+  ///
+  /// Note that this value should be greater than or equal to NvVariableLength.
+  /// Note that this address should align with the block size requirements of the flash device.
+  ///
+  UINT64                  FtwSpareLength;
+  ///
+  /// Base address of the FTW working block range in the flash device.
+  ///
+  /// Note that if FtwWorkingLength is larger than on block size, this value should be block size aligned.
+  ///
+  EFI_PHYSICAL_ADDRESS    FtwWorkingBaseAddress;
+  ///
+  /// Size of the FTW working block range in the flash device.
+  ///
+  /// Note that if the value is less than on block size, the range should not span blocks.
+  /// Note that if the value is larger than one block size, this value should be block size aligned.
+  ///
+  UINT64                  FtwWorkingLength;
+} VARIABLE_FLASH_INFO;
+
+#pragma pack (pop)
+
+#endif
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index cf79292ec8..4e82f58360 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -226,6 +226,10 @@
   #  Include/Guid/SmmVariableCommon.h
   gSmmVariableWriteGuid  = { 0x93ba1826, 0xdffb, 0x45dd, { 0x82, 0xa7, 0xe7, 0xdc, 0xaa, 0x3b, 0xbd, 0xf3 }}
 
+  ## Guid of the variable flash information HOB.
+  #  Include/Guid/VariableFlashInfo.h
+  gVariableFlashInfoHobGuid = { 0x5d11c653, 0x8154, 0x4ac3, { 0xa8, 0xc2, 0xfb, 0xa2, 0x89, 0x20, 0xfc, 0x90 }}
+
   ## Performance protocol guid that also acts as the performance HOB guid and performance variable GUID
   #  Include/Guid/Performance.h
   gPerformanceProtocolGuid       = { 0x76B6BDFA, 0x2ACD, 0x4462, { 0x9E, 0x3F, 0xCB, 0x58, 0xC9, 0x69, 0xD9, 0x37 } }