[edk2-devel] [PATCH v6 26/42] OvmfPkg: Add support to perform SEV-ES initialization

[Lendacky, Thomas]

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

When SEV-ES is enabled, then SEV is also enabled. Add support to the SEV
initialization function to also check for SEV-ES being enabled, and if
enabled, set the SEV-ES enabled PCD (PcdSevEsIsEnabled).

Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Laszlo Ersek <lersek at redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel at linaro.org>
Reviewed-by: Laszlo Ersek <lersek at redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
---
 OvmfPkg/OvmfPkgIa32.dsc             |  3 +++
 OvmfPkg/OvmfPkgIa32X64.dsc          |  3 +++
 OvmfPkg/OvmfPkgX64.dsc              |  3 +++
 OvmfPkg/PlatformPei/PlatformPei.inf |  1 +
 OvmfPkg/PlatformPei/AmdSev.c        | 26 ++++++++++++++++++++++++++
 5 files changed, 36 insertions(+)

diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 2701630be8f0..d6bb1f6e795c 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -580,6 +580,9 @@ [PcdsDynamicDefault]
   # Set memory encryption mask
   gEfiMdeModulePkgTokenSpaceGuid.PcdPteMemoryEncryptionAddressOrMask|0x0
 
+  # Set SEV-ES defaults
+  gUefiCpuPkgTokenSpaceGuid.PcdSevEsIsEnabled|0
+
 !if $(SMM_REQUIRE) == TRUE
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes|8
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35SmramAtDefaultSmbase|FALSE
diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
index 671fdfbbd47d..78d2107846a0 100644
--- a/OvmfPkg/OvmfPkgIa32X64.dsc
+++ b/OvmfPkg/OvmfPkgIa32X64.dsc
@@ -591,6 +591,9 @@ [PcdsDynamicDefault]
   # Set memory encryption mask
   gEfiMdeModulePkgTokenSpaceGuid.PcdPteMemoryEncryptionAddressOrMask|0x0
 
+  # Set SEV-ES defaults
+  gUefiCpuPkgTokenSpaceGuid.PcdSevEsIsEnabled|0
+
 !if $(SMM_REQUIRE) == TRUE
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes|8
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35SmramAtDefaultSmbase|FALSE
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 5abf83e05480..65dd4c612073 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -590,6 +590,9 @@ [PcdsDynamicDefault]
   # Set memory encryption mask
   gEfiMdeModulePkgTokenSpaceGuid.PcdPteMemoryEncryptionAddressOrMask|0x0
 
+  # Set SEV-ES defaults
+  gUefiCpuPkgTokenSpaceGuid.PcdSevEsIsEnabled|0
+
 !if $(SMM_REQUIRE) == TRUE
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes|8
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35SmramAtDefaultSmbase|FALSE
diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf b/OvmfPkg/PlatformPei/PlatformPei.inf
index 8531c63995c1..19fc6002cadb 100644
--- a/OvmfPkg/PlatformPei/PlatformPei.inf
+++ b/OvmfPkg/PlatformPei/PlatformPei.inf
@@ -102,6 +102,7 @@ [Pcd]
   gUefiCpuPkgTokenSpaceGuid.PcdCpuMaxLogicalProcessorNumber
   gUefiCpuPkgTokenSpaceGuid.PcdCpuBootLogicalProcessorNumber
   gUefiCpuPkgTokenSpaceGuid.PcdCpuApStackSize
+  gUefiCpuPkgTokenSpaceGuid.PcdSevEsIsEnabled
 
 [FixedPcd]
   gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress
diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
index e484f4b311fe..4dc5340caa7a 100644
--- a/OvmfPkg/PlatformPei/AmdSev.c
+++ b/OvmfPkg/PlatformPei/AmdSev.c
@@ -21,6 +21,27 @@
 
 #include "Platform.h"
 
+/**
+
+  Initialize SEV-ES support if running as an SEV-ES guest.
+
+  **/
+STATIC
+VOID
+AmdSevEsInitialize (
+  VOID
+  )
+{
+  RETURN_STATUS     PcdStatus;
+
+  if (!MemEncryptSevEsIsEnabled ()) {
+    return;
+  }
+
+  PcdStatus = PcdSetBoolS (PcdSevEsIsEnabled, TRUE);
+  ASSERT_RETURN_ERROR (PcdStatus);
+}
+
 /**
 
   Function checks if SEV support is available, if present then it sets
@@ -103,4 +124,9 @@ AmdSevInitialize (
         );
     }
   }
+
+  //
+  // Check and perform SEV-ES initialization if required.
+  //
+  AmdSevEsInitialize ();
 }
-- 
2.17.1


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