From 34e16ff883f0e047fb9c0ac5c179f1b084ffbf98 Mon Sep 17 00:00:00 2001
From: Brijesh Singh <brijesh.singh@amd.com>
Date: Wed, 19 May 2021 13:19:39 -0500
Subject: [PATCH] MdePkg/Register/Amd: define GHCB macros for hypervisor
 feature detection

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

Version 2 of GHCB introduces advertisement of features that are supported
by the hypervisor. See the GHCB spec section 2.2 for an additional details.

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: Laszlo Ersek <lersek@redhat.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Erdem Aktas <erdemaktas@google.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Message-Id: <20210519181949.6574-4-brijesh.singh@amd.com>
---
 MdePkg/Include/Register/Amd/Fam17Msr.h | 7 +++++++
 MdePkg/Include/Register/Amd/Ghcb.h     | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/MdePkg/Include/Register/Amd/Fam17Msr.h b/MdePkg/Include/Register/Amd/Fam17Msr.h
index 7368ce7af0..cdb8f588cc 100644
--- a/MdePkg/Include/Register/Amd/Fam17Msr.h
+++ b/MdePkg/Include/Register/Amd/Fam17Msr.h
@@ -48,6 +48,11 @@ typedef union {
     UINT32  Reserved2:32;
   } GhcbTerminate;
 
+  struct {
+    UINT64  Function:12;
+    UINT64  Features:52;
+  } GhcbHypervisorFeatures;
+
   VOID    *Ghcb;
 
   UINT64  GhcbPhysicalAddress;
@@ -57,6 +62,8 @@ typedef union {
 #define GHCB_INFO_SEV_INFO_GET                      2
 #define GHCB_INFO_CPUID_REQUEST                     4
 #define GHCB_INFO_CPUID_RESPONSE                    5
+#define GHCB_HYPERVISOR_FEATURES_REQUEST            128
+#define GHCB_HYPERVISOR_FEATURES_RESPONSE           129
 #define GHCB_INFO_TERMINATE_REQUEST                 256
 
 #define GHCB_TERMINATE_GHCB                0
diff --git a/MdePkg/Include/Register/Amd/Ghcb.h b/MdePkg/Include/Register/Amd/Ghcb.h
index 712dc8e769..ec232ebd38 100644
--- a/MdePkg/Include/Register/Amd/Ghcb.h
+++ b/MdePkg/Include/Register/Amd/Ghcb.h
@@ -54,6 +54,7 @@
 #define SVM_EXIT_NMI_COMPLETE                   0x80000003ULL
 #define SVM_EXIT_AP_RESET_HOLD                  0x80000004ULL
 #define SVM_EXIT_AP_JUMP_TABLE                  0x80000005ULL
+#define SVM_EXIT_HYPERVISOR_FEATURES            0x8000FFFDULL
 #define SVM_EXIT_UNSUPPORTED                    0x8000FFFFULL
 
 //
@@ -154,4 +155,11 @@ typedef union {
 #define GHCB_EVENT_INJECTION_TYPE_EXCEPTION  3
 #define GHCB_EVENT_INJECTION_TYPE_SOFT_INT   4
 
+//
+// Hypervisor features
+//
+#define GHCB_HV_FEATURES_SNP                              BIT0
+#define GHCB_HV_FEATURES_SNP_AP_CREATE                    (GHCB_HV_FEATURES_SNP | BIT1)
+#define GHCB_HV_FEATURES_SNP_RESTRICTED_INJECTION         (GHCB_HV_FEATURES_SNP_AP_CREATE | BIT2)
+#define GHCB_HV_FEATURES_SNP_RESTRICTED_INJECTION_TIMER   (GHCB_HV_FEATURES_SNP_RESTRICTED_INJECTION | BIT3)
 #endif
-- 
2.39.2