diff --git a/MdePkg/Include/ConfidentialComputingGuestAttr.h b/MdePkg/Include/ConfidentialComputingGuestAttr.h
new file mode 100644
index 0000000000..6a13018015
--- /dev/null
+++ b/MdePkg/Include/ConfidentialComputingGuestAttr.h
@@ -0,0 +1,25 @@
+/** @file
+Definitions for Confidential Computing Attribute
+
+Copyright (c) 2021 AMD Inc. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef CONFIDENTIAL_COMPUTING_GUEST_ATTR_H_
+#define CONFIDENTIAL_COMPUTING_GUEST_ATTR_H_
+
+typedef enum {
+  /* The guest is running with memory encryption disabled. */
+  CCAttrNotEncrypted = 0,
+
+  /* The guest is running with AMD SEV memory encryption enabled. */
+  CCAttrAmdSev    = 0x100,
+  CCAttrAmdSevEs  = 0x101,
+  CCAttrAmdSevSnp = 0x102,
+
+  /* The guest is running with Intel TDX memory encryption enabled. */
+  CCAttrIntelTdx = 0x200,
+} CONFIDENTIAL_COMPUTING_GUEST_ATTR;
+
+#endif
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 8b18415b10..cd903c35d2 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -2396,5 +2396,9 @@
   # @Prompt FSB Clock.
   gEfiMdePkgTokenSpaceGuid.PcdFSBClock|200000000|UINT32|0x0000000c
 
+  ## This dynamic PCD indicates the memory encryption attribute of the guest.
+  # @Prompt Memory encryption attribute
+  gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0|UINT64|0x0000002e
+
 [UserExtensions.TianoCore."ExtraFiles"]
   MdePkgExtra.uni