[PATCH v9 20/32] UefiCpuPkg: Define ConfidentialComputingGuestAttr

["Brijesh Singh" <brijesh.singh@amd.com>]

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275

While initializing APs, the MpInitLib may need to know whether the
guest is running with active AMD SEV or Intel TDX memory encryption.

Add a new ConfidentialComputingGuestAttr PCD that can be used to query
the memory encryption attribute.

Cc: Michael Roth <michael.roth@amd.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Suggested-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 UefiCpuPkg/UefiCpuPkg.dec                     |  4 +++
 .../Include/ConfidentialComputingGuestAttr.h  | 25 +++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 UefiCpuPkg/Include/ConfidentialComputingGuestAttr.h

diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index 62acb291f309..9dbaa407c399 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -396,5 +396,9 @@ [PcdsDynamic, PcdsDynamicEx]
   # @Prompt SEV-ES Status
   gUefiCpuPkgTokenSpaceGuid.PcdSevEsIsEnabled|FALSE|BOOLEAN|0x60000016
 
+  ## This dynamic PCD indicates the memory encryption attribute of the guest.
+  # @Prompt Memory encryption attribute
+  gUefiCpuPkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0|UINT64|0x60000017
+
 [UserExtensions.TianoCore."ExtraFiles"]
   UefiCpuPkgExtra.uni
diff --git a/UefiCpuPkg/Include/ConfidentialComputingGuestAttr.h b/UefiCpuPkg/Include/ConfidentialComputingGuestAttr.h
new file mode 100644
index 000000000000..495b0df0ac33
--- /dev/null
+++ b/UefiCpuPkg/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
-- 
2.25.1