[PATCH v4 1/4] MdePkg: Add header for SEV-SNP secrets page struct

["Roth, Michael" <Michael.Roth@amd.com>]

This will be needed so that the AP Jump Table address can be stored for
use by the operating system later, and possibly for other things in the
future.

Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
---
 MdePkg/Include/Register/Amd/SnpSecretsPage.h | 56 ++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 MdePkg/Include/Register/Amd/SnpSecretsPage.h

diff --git a/MdePkg/Include/Register/Amd/SnpSecretsPage.h b/MdePkg/Include/Register/Amd/SnpSecretsPage.h
new file mode 100644
index 0000000000..3188459150
--- /dev/null
+++ b/MdePkg/Include/Register/Amd/SnpSecretsPage.h
@@ -0,0 +1,56 @@
+/** @file
+Definitions for AMD SEV-SNP Secrets Page
+
+Copyright (c) 2022 AMD Inc. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef SNP_SECRETS_PAGE_H_
+#define SNP_SECRETS_PAGE_H_
+
+//
+// OS-defined area of secrets page
+//
+// As defined by "SEV-ES Guest-Hypervisor Communication Block Standardization",
+// revision 2.01, section 2.7, "SEV-SNP Secrets Page".
+//
+typedef PACKED struct _SNP_SECRETS_OS_AREA {
+  UINT32    Vmpl0MsgSeqNumLo;
+  UINT32    Vmpl1MsgSeqNumLo;
+  UINT32    Vmpl2MsgSeqNumLo;
+  UINT32    Vmpl3MsgSeqNumLo;
+  UINT64    ApJumpTablePa;
+  UINT32    Vmpl0MsgSeqNumHi;
+  UINT32    Vmpl1MsgSeqNumHi;
+  UINT32    Vmpl2MsgSeqNumHi;
+  UINT32    Vmpl3MsgSeqNumHi;
+  UINT8     Reserved2[22];
+  UINT16    Version;
+  UINT8     GuestUsage[32];
+} SNP_SECRETS_OS_AREA;
+
+#define VMPCK_KEY_LEN  32
+
+//
+// SEV-SNP Secrets page
+//
+// As defined by "SEV-SNP Firmware ABI", revision 1.51, section 8.17.2.5,
+// "PAGE_TYPE_SECRETS".
+//
+typedef PACKED struct _SNP_SECRETS_PAGE {
+  UINT32                 Version;
+  UINT32                 ImiEn    : 1,
+                         Reserved : 31;
+  UINT32                 Fms;
+  UINT32                 Reserved2;
+  UINT8                  Gosvw[16];
+  UINT8                  Vmpck0[VMPCK_KEY_LEN];
+  UINT8                  Vmpck1[VMPCK_KEY_LEN];
+  UINT8                  Vmpck2[VMPCK_KEY_LEN];
+  UINT8                  Vmpck3[VMPCK_KEY_LEN];
+  SNP_SECRETS_OS_AREA    OsArea;
+  UINT8                  Reserved3[3840];
+} SNP_SECRETS_PAGE;
+
+#endif
-- 
2.25.1