OvmfPkg/PlatformPei: set PcdConfidentialComputingAttr when SEV is active

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

The MpInitLib uses the ConfidentialComputingAttr PCD to determine whether
AMD SEV is active so that it can use the VMGEXITs defined in the GHCB
specification to create APs.

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>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Suggested-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
index a0f9178..c60a153 100644
--- a/OvmfPkg/PlatformPei/AmdSev.c
+++ b/OvmfPkg/PlatformPei/AmdSev.c
@@ -20,6 +20,7 @@
 #include <Register/Amd/Msr.h>

 #include <Register/Intel/SmramSaveStateMap.h>

 #include <Library/VmgExitLib.h>

+#include <ConfidentialComputingGuestAttr.h>

 

 #include "Platform.h"

 

@@ -345,4 +346,18 @@ AmdSevInitialize (
   // Check and perform SEV-ES initialization if required.

   //

   AmdSevEsInitialize ();

+

+  //

+  // Set the Confidential computing attr PCD to communicate which SEV

+  // technology is active.

+  //

+  if (MemEncryptSevSnpIsEnabled ()) {

+    PcdStatus = PcdSet64S (PcdConfidentialComputingGuestAttr, CCAttrAmdSevSnp);

+  } else if (MemEncryptSevEsIsEnabled ()) {

+    PcdStatus = PcdSet64S (PcdConfidentialComputingGuestAttr, CCAttrAmdSevEs);

+  } else {

+    PcdStatus = PcdSet64S (PcdConfidentialComputingGuestAttr, CCAttrAmdSev);

+  }

+

+  ASSERT_RETURN_ERROR (PcdStatus);

 }