OvmfPkg/Include/WorkArea.h

/** @file

  Work Area structure definition

  Copyright (c) 2021, AMD Inc.

  SPDX-License-Identifier: BSD-2-Clause-Patent
**/

#ifndef __OVMF_WORK_AREA_H__
#define __OVMF_WORK_AREA_H__

#include <ConfidentialComputingGuestAttr.h>

//
// Confidential computing work area header definition. Any change
// to the structure need to be kept in sync with the
// PcdOvmfConfidentialComputingWorkAreaHeader.
//
// PcdOvmfConfidentialComputingWorkAreaHeader ==
//   sizeof (CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER)
// PcdOvmfConfidentialComputingWorkAreaHeader defined in:
//   OvmfPkg/OvmfPkg.dec
//   OvmfPkg/OvmfPkgDefines.fdf.inc
typedef struct _CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER {
  UINT8    GuestType;
  UINT8    Reserved1[3];
} CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER;

//
// Internal structure for holding SEV-ES information needed during SEC phase
// and valid only during SEC phase and early PEI during platform
// initialization.
//
// This structure is also used by assembler files:
//   OvmfPkg/ResetVector/ResetVector.nasmb
//   OvmfPkg/ResetVector/Ia32/PageTables64.asm
//   OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm
// any changes must stay in sync with its usage.
//
typedef struct _SEC_SEV_ES_WORK_AREA {
  //
  // 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;

//
// The SEV work area definition.
//
typedef struct _SEV_WORK_AREA {
  CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER    Header;

  SEC_SEV_ES_WORK_AREA                       SevEsWorkArea;
} SEV_WORK_AREA;

//
// The TDX work area definition
//
typedef struct _SEC_TDX_WORK_AREA {
  UINT32    PageTableReady;
  UINT32    Gpaw;
  UINT64    HobList;
} SEC_TDX_WORK_AREA;

typedef struct _TDX_WORK_AREA {
  CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER    Header;
  SEC_TDX_WORK_AREA                          SecTdxWorkArea;
} TDX_WORK_AREA;

typedef union {
  CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER    Header;
  SEV_WORK_AREA                              SevWorkArea;
  TDX_WORK_AREA                              TdxWorkArea;
} OVMF_WORK_AREA;

#endif