PeiTdxHelper.c File Reference

#include <Base.h>
#include <PiPei.h>

Go to the source code of this file.

Functions
EFI_STATUS	InternalBuildGuidHobForTdxMeasurement (VOID)
EFI_STATUS EFIAPI	TdxHelperProcessTdHob (VOID)
EFI_STATUS EFIAPI	TdxHelperMeasureTdHob (VOID)
EFI_STATUS EFIAPI	TdxHelperMeasureCfvImage (VOID)
EFI_STATUS EFIAPI	TdxHelperBuildGuidHobForTdxMeasurement (VOID)

Detailed Description

TdxHelper Functions which are used in PEI phase

Copyright (c) 2022 - 2023, Intel Corporation. All rights reserved.

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

Definition in file PeiTdxHelper.c.

Function Documentation

InternalBuildGuidHobForTdxMeasurement()

EFI_STATUS InternalBuildGuidHobForTdxMeasurement

(

VOID

)

Build the GuidHob for tdx measurements which were done in SEC phase. The measurement values are stored in WorkArea.

Return values

EFI_SUCCESS	The GuidHob is built successfully
Others	Other errors as indicated

Definition at line 173 of file TdxMeasurementHob.c.

TdxHelperBuildGuidHobForTdxMeasurement()

EFI_STATUS EFIAPI TdxHelperBuildGuidHobForTdxMeasurement

(

VOID

)

Build the GuidHob for tdx measurements which were done in SEC phase. The measurement values are stored in WorkArea.

Return values

EFI_SUCCESS	The GuidHob is built successfully
Others	Other errors as indicated

Definition at line 86 of file PeiTdxHelper.c.

TdxHelperMeasureCfvImage()

EFI_STATUS EFIAPI TdxHelperMeasureCfvImage

(

VOID

)

In Tdx guest, Configuration FV (CFV) is treated as external input because it may contain the data provided by VMM. From the sucurity perspective Cfv image should be measured before it is consumed.

Return values

EFI_SUCCESS	Successfully measure the CFV image
Others	Other error as indicated

Definition at line 70 of file PeiTdxHelper.c.

TdxHelperMeasureTdHob()

EFI_STATUS EFIAPI TdxHelperMeasureTdHob

(

VOID

)

In Tdx guest, TdHob is passed from host VMM to guest firmware and it contains the information of the memory resource. From the security perspective before it is consumed, it should be measured and extended.

Return values

EFI_SUCCESS	Successfully measure the TdHob
Others	Other error as indicated

Definition at line 53 of file PeiTdxHelper.c.

TdxHelperProcessTdHob()

EFI_STATUS EFIAPI TdxHelperProcessTdHob

(

VOID

)

In Tdx guest, some information need to be passed from host VMM to guest firmware. For example, the memory resource, etc. These information are prepared by host VMM and put in TdHob which is described in TdxMetadata. TDVF processes the TdHob to accept memories.

Return values

EFI_SUCCESS	Successfully process the TdHob
Others	Other error as indicated

Definition at line 36 of file PeiTdxHelper.c.