OvmfPkg/IntelTdx/TdxHelperLib/SecTdxHelper.c

   1 /** @file
   2   TdxHelper Functions which are used in SEC phase
   3
   4   Copyright (c) 2022 - 2023, Intel Corporation. All rights reserved.<BR>
   5
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include <PiPei.h>
  11
  12 /**
  13   In Tdx guest, some information need to be passed from host VMM to guest
  14   firmware. For example, the memory resource, etc. These information are
  15   prepared by host VMM and put in TdHob which is described in TdxMetadata.
  16   TDVF processes the TdHob to accept memories.
  17
  18   @retval   EFI_SUCCESS   Successfully process the TdHob
  19   @retval   Others        Other error as indicated
  20 **/
  21 EFI_STATUS
  22 EFIAPI
  23 TdxHelperProcessTdHob (
  24   VOID
  25   )
  26 {
  27   return EFI_UNSUPPORTED;
  28 }
  29
  30 /**
  31   In Tdx guest, TdHob is passed from host VMM to guest firmware and it contains
  32   the information of the memory resource. From the security perspective before
  33   it is consumed, it should be measured and extended.
  34  *
  35  * @retval EFI_SUCCESS Successfully measure the TdHob
  36  * @retval Others      Other error as indicated
  37  */
  38 EFI_STATUS
  39 EFIAPI
  40 TdxHelperMeasureTdHob (
  41   VOID
  42   )
  43 {
  44   return EFI_UNSUPPORTED;
  45 }
  46
  47 /**
  48  * In Tdx guest, Configuration FV (CFV) is treated as external input because it
  49  * may contain the data provided by VMM. From the sucurity perspective Cfv image
  50  * should be measured before it is consumed.
  51  *
  52  * @retval EFI_SUCCESS Successfully measure the CFV image
  53  * @retval Others      Other error as indicated
  54  */
  55 EFI_STATUS
  56 EFIAPI
  57 TdxHelperMeasureCfvImage (
  58   VOID
  59   )
  60 {
  61   return EFI_UNSUPPORTED;
  62 }
  63
  64 /**
  65   Build the GuidHob for tdx measurements which were done in SEC phase.
  66   The measurement values are stored in WorkArea.
  67
  68   @retval EFI_SUCCESS  The GuidHob is built successfully
  69   @retval Others       Other errors as indicated
  70 **/
  71 EFI_STATUS
  72 EFIAPI
  73 TdxHelperBuildGuidHobForTdxMeasurement (
  74   VOID
  75   )
  76 {
  77   return EFI_UNSUPPORTED;
  78 }