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OvmfPkg: Add PrePiHobListPointerLibTdx

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RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

This library sets / gets the Hob list pointer in TDX_WORK_AREA.
This is because it is designed to be used in SEC where the value of
global variable cannot be saved, so the Hob list pointer is saved
in TDX_WORK_AREA.

TDX_WORK_AREA shares the same base address as SEV_WORK_AREA which is
pointed by PcdSevEsWorkAreaBase. This PCD will be renamed to
PcdCcWorkAreaBase as Gerd suggested.
See https://edk2.groups.io/g/devel/message/86642

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
This commit is contained in:
Min Xu 2021-12-01 15:52:31 +08:00 committed by mergify[bot]
parent 580a6b616b
commit 75942a52ae
2 changed files with 86 additions and 0 deletions
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57
OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointer.c Normal file
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@ -0,0 +1,57 @@
/** @file
*
* Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
#include <PiPei.h>
#include <Library/PrePiHobListPointerLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <WorkArea.h>
/**
Returns the pointer to the HOB list.
This function returns the pointer to first HOB in the list.
@return The pointer to the HOB list.
**/
VOID *
EFIAPI
PrePeiGetHobList (
VOID
)
{
TDX_WORK_AREA *TdxWorkArea;
TdxWorkArea = (TDX_WORK_AREA *)(UINTN)FixedPcdGet32 (PcdSevEsWorkAreaBase);
ASSERT (TdxWorkArea != NULL);
ASSERT (TdxWorkArea->SecTdxWorkArea.HobList != 0);
return (VOID *)(UINTN)TdxWorkArea->SecTdxWorkArea.HobList;
}
/**
Updates the pointer to the HOB list.
@param HobList Hob list pointer to store
**/
EFI_STATUS
EFIAPI
PrePeiSetHobList (
IN VOID *HobList
)
{
TDX_WORK_AREA *TdxWorkArea;
TdxWorkArea = (TDX_WORK_AREA *)(UINTN)FixedPcdGet32 (PcdSevEsWorkAreaBase);
ASSERT (TdxWorkArea != NULL);
TdxWorkArea->SecTdxWorkArea.HobList = (UINTN)HobList;
return EFI_SUCCESS;
}

29
OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointerLibTdx.inf Normal file
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#/** @file
#
# Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
#**/
[Defines]
INF_VERSION = 0x00010005
BASE_NAME = PrePiHobListPointerLibTdx
FILE_GUID = 28297DB9-4CE7-4679-80E6-0270B215A2F2
MODULE_TYPE = BASE
VERSION_STRING = 1.0
LIBRARY_CLASS = PrePiHobListPointerLib
[Sources]
PrePiHobListPointer.c
[Packages]
MdePkg/MdePkg.dec
OvmfPkg/OvmfPkg.dec
EmbeddedPkg/EmbeddedPkg.dec
UefiCpuPkg/UefiCpuPkg.dec
[Pcd]
gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaBase
[LibraryClasses]
PcdLib