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63c50d3ff2
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>
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/** @file
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Work Area structure definition
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Copyright (c) 2021, AMD Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef __OVMF_WORK_AREA_H__
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#define __OVMF_WORK_AREA_H__
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//
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// Guest type for the work area
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//
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typedef enum {
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GUEST_TYPE_NON_ENCRYPTED,
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GUEST_TYPE_AMD_SEV,
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GUEST_TYPE_INTEL_TDX,
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} GUEST_TYPE;
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//
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// Confidential computing work area header definition. Any change
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// to the structure need to be kept in sync with the
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// PcdOvmfConfidentialComputingWorkAreaHeader.
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//
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// PcdOvmfConfidentialComputingWorkAreaHeader ==
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// sizeof (CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER)
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// PcdOvmfConfidentialComputingWorkAreaHeader defined in:
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// OvmfPkg/OvmfPkg.dec
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// OvmfPkg/OvmfPkgDefines.fdf.inc
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typedef struct _CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER {
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UINT8 GuestType;
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UINT8 Reserved1[3];
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} CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER;
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//
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// Internal structure for holding SEV-ES information needed during SEC phase
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// and valid only during SEC phase and early PEI during platform
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// initialization.
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//
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// This structure is also used by assembler files:
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// OvmfPkg/ResetVector/ResetVector.nasmb
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// OvmfPkg/ResetVector/Ia32/PageTables64.asm
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// OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm
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// any changes must stay in sync with its usage.
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//
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typedef struct _SEC_SEV_ES_WORK_AREA {
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//
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// Hold the SevStatus MSR value read by OvmfPkg/ResetVector/Ia32/AmdSev.c
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//
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UINT64 SevStatusMsrValue;
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UINT64 RandomData;
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UINT64 EncryptionMask;
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//
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// Indicator that the VC handler is called. It is used during the SevFeature
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// detection in OvmfPkg/ResetVector/Ia32/AmdSev.c
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//
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UINT8 ReceivedVc;
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} SEC_SEV_ES_WORK_AREA;
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//
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// The SEV work area definition.
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//
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typedef struct _SEV_WORK_AREA {
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CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER Header;
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SEC_SEV_ES_WORK_AREA SevEsWorkArea;
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} SEV_WORK_AREA;
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typedef union {
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CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER Header;
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SEV_WORK_AREA SevWorkArea;
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} OVMF_WORK_AREA;
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#endif
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