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OvmfPkg/PlatformPei: set PcdConfidentialComputingAttr when SEV is active

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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>
This commit is contained in:
Brijesh Singh
2021-12-09 11:27:49 +08:00
committed by mergify[bot]
parent 26210f9436
commit 504ae26b80
6 changed files with 28 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
OvmfPkg/PlatformPei/AmdSev.c
View File

@@ -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);
}