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OvmfPkg/AmdSev: assign and reserve the Sev Secret area 

Create a one page secret area in the MEMFD and reserve the area with a
boot time HOB.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3077
Signed-off-by: James Bottomley <jejb@linux.ibm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201130202819.3910-6-jejb@linux.ibm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
[lersek@redhat.com: s/protect/reserve/g in the commit message, at Ard's
 and James's suggestion]
This commit is contained in:
James Bottomley 2020-11-30 12:28:18 -08:00 committed by mergify[bot]
parent 224752eced
commit bff2811c6d
4 changed files with 65 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
OvmfPkg/AmdSev/AmdSevX64.dsc
View File

@ -613,6 +613,7 @@
OvmfPkg/PlatformPei/PlatformPei.inf
UefiCpuPkg/Universal/Acpi/S3Resume2Pei/S3Resume2Pei.inf
UefiCpuPkg/CpuMpPei/CpuMpPei.inf
OvmfPkg/AmdSev/SecretPei/SecretPei.inf
!if $(TPM_ENABLE) == TRUE
OvmfPkg/Tcg/Tcg2Config/Tcg2ConfigPei.inf

4
OvmfPkg/AmdSev/AmdSevX64.fdf
View File

@ -59,6 +59,9 @@ gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmf
0x00B000|0x001000
gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaBase|gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaSize
0x00C000|0x001000
gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretBase|gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretSize
0x010000|0x010000
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamSize
@ -138,6 +141,7 @@ INF OvmfPkg/PlatformPei/PlatformPei.inf
INF MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf
INF UefiCpuPkg/Universal/Acpi/S3Resume2Pei/S3Resume2Pei.inf
INF UefiCpuPkg/CpuMpPei/CpuMpPei.inf
INF OvmfPkg/AmdSev/SecretPei/SecretPei.inf
!if $(TPM_ENABLE) == TRUE
INF OvmfPkg/Tcg/Tcg2Config/Tcg2ConfigPei.inf

25
OvmfPkg/AmdSev/SecretPei/SecretPei.c Normal file
View File

@ -0,0 +1,25 @@
/** @file
SEV Secret boot time HOB placement
Copyright (C) 2020 James Bottomley, IBM Corporation.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Library/HobLib.h>
#include <Library/PcdLib.h>
EFI_STATUS
EFIAPI
InitializeSecretPei (
IN EFI_PEI_FILE_HANDLE FileHandle,
IN CONST EFI_PEI_SERVICES **PeiServices
)
{
BuildMemoryAllocationHob (
PcdGet32 (PcdSevLaunchSecretBase),
PcdGet32 (PcdSevLaunchSecretSize),
EfiBootServicesData
);
return EFI_SUCCESS;
}

35
OvmfPkg/AmdSev/SecretPei/SecretPei.inf Normal file
View File

@ -0,0 +1,35 @@
## @file
# PEI support for SEV Secrets
#
# Copyright (C) 2020 James Bottomley, IBM Corporation.
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
##
[Defines]
INF_VERSION = 0x00010005
BASE_NAME = SecretPei
FILE_GUID = 45260dde-0c3c-4b41-a226-ef3803fac7d4
MODULE_TYPE = PEIM
VERSION_STRING = 1.0
ENTRY_POINT = InitializeSecretPei
[Sources]
SecretPei.c
[Packages]
OvmfPkg/OvmfPkg.dec
MdePkg/MdePkg.dec
[LibraryClasses]
HobLib
PeimEntryPoint
PcdLib
[FixedPcd]
gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretBase
gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretSize
[Depex]
TRUE