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OvmfPkg/ResetVector: cache the SEV status MSR value in workarea

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3582

In order to probe the SEV feature the BaseMemEncryptLib and Reset vector
reads the SEV_STATUS MSR. Cache the value on the first read in the
workarea. In the next patches the value saved in the workarea will
be used by the BaseMemEncryptLib. This not only eliminates the extra
MSR reads it also helps cleaning up the code in BaseMemEncryptLib.

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>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Acked-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Brijesh Singh
2022-02-21 22:59:13 +08:00
committed by mergify[bot]
parent de463163d9
commit 63c50d3ff2
5 changed files with 39 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
OvmfPkg/Include/WorkArea.h
View File

@@ -46,12 +46,20 @@ typedef struct _CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER {
// any changes must stay in sync with its usage.
//
typedef struct _SEC_SEV_ES_WORK_AREA {
UINT8 SevEsEnabled;
UINT8 Reserved1[7];
//
// Hold the SevStatus MSR value read by OvmfPkg/ResetVector/Ia32/AmdSev.c
//
UINT64 SevStatusMsrValue;
UINT64 RandomData;
UINT64 EncryptionMask;
//
// Indicator that the VC handler is called. It is used during the SevFeature
// detection in OvmfPkg/ResetVector/Ia32/AmdSev.c
//
UINT8 ReceivedVc;
} SEC_SEV_ES_WORK_AREA;
//