diff --git a/MdeModulePkg/Include/Guid/S3SmmInitDone.h b/MdeModulePkg/Include/Guid/S3SmmInitDone.h
new file mode 100644
index 0000000000..53fef8ed19
--- /dev/null
+++ b/MdeModulePkg/Include/Guid/S3SmmInitDone.h
@@ -0,0 +1,27 @@
+/** @file
+  After S3 SMM initialization is done and before S3 boot script is executed,
+  this GUID is installed as PPI in PEI and protocol in SMM environment. 
+  It allows for PEIMs or SMM drivers to hook this point and do the required tasks.
+
+  Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+  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 __S3_SMM_INIT_DONE_H__
+#define __S3_SMM_INIT_DONE_H__
+
+#define EDKII_S3_SMM_INIT_DONE_GUID \
+  { \
+    0x8f9d4825, 0x797d, 0x48fc, { 0x84, 0x71, 0x84, 0x50, 0x25, 0x79, 0x2e, 0xf6 } \
+  }
+
+extern EFI_GUID gEdkiiS3SmmInitDoneGuid;
+
+#endif
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 2bed3e6f6f..59a2dcff8c 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -401,6 +401,9 @@
   ## Include/Guid/EndofS3Resume.h
   gEdkiiEndOfS3ResumeGuid = { 0x96f5296d, 0x05f7, 0x4f3c, {0x84, 0x67, 0xe4, 0x56, 0x89, 0x0e, 0x0c, 0xb5 } }
 
+  ## Include/Guid/S3SmmInitDone.h
+  gEdkiiS3SmmInitDoneGuid = { 0x8f9d4825, 0x797d, 0x48fc, { 0x84, 0x71, 0x84, 0x50, 0x25, 0x79, 0x2e, 0xf6 } }
+
 [Ppis]
   ## Include/Ppi/AtaController.h
   gPeiAtaControllerPpiGuid       = { 0xa45e60d1, 0xc719, 0x44aa, { 0xb0, 0x7a, 0xaa, 0x77, 0x7f, 0x85, 0x90, 0x6d }}