| 1 | /** @file
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| 2 | TdxHelper Functions which are used in PEI phase
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| 3 |
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| 4 | Copyright (c) 2022 - 2023, Intel Corporation. All rights reserved.<BR>
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| 5 |
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| 6 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 7 |
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| 8 | **/
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| 9 |
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| 10 | #include <Base.h>
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| 11 | #include <PiPei.h>
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| 12 |
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| 13 | /**
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| 14 | Build the GuidHob for tdx measurements which were done in SEC phase.
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| 15 | The measurement values are stored in WorkArea.
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| 16 |
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| 17 | @retval EFI_SUCCESS The GuidHob is built successfully
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| 18 | @retval Others Other errors as indicated
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| 19 | **/
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| 20 | EFI_STATUS
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| 21 | InternalBuildGuidHobForTdxMeasurement (
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| 22 | VOID
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| 23 | );
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| 24 |
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| 25 | /**
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| 26 | In Tdx guest, some information need to be passed from host VMM to guest
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| 27 | firmware. For example, the memory resource, etc. These information are
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| 28 | prepared by host VMM and put in TdHob which is described in TdxMetadata.
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| 29 | TDVF processes the TdHob to accept memories.
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| 30 |
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| 31 | @retval EFI_SUCCESS Successfully process the TdHob
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| 32 | @retval Others Other error as indicated
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| 33 | **/
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| 34 | EFI_STATUS
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| 35 | EFIAPI
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| 36 | TdxHelperProcessTdHob (
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| 37 | VOID
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| 38 | )
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| 39 | {
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| 40 | return EFI_UNSUPPORTED;
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| 41 | }
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| 42 |
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| 43 | /**
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| 44 | In Tdx guest, TdHob is passed from host VMM to guest firmware and it contains
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| 45 | the information of the memory resource. From the security perspective before
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| 46 | it is consumed, it should be measured and extended.
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| 47 | *
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| 48 | * @retval EFI_SUCCESS Successfully measure the TdHob
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| 49 | * @retval Others Other error as indicated
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| 50 | */
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| 51 | EFI_STATUS
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| 52 | EFIAPI
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| 53 | TdxHelperMeasureTdHob (
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| 54 | VOID
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| 55 | )
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| 56 | {
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| 57 | return EFI_UNSUPPORTED;
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| 58 | }
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| 59 |
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| 60 | /**
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| 61 | * In Tdx guest, Configuration FV (CFV) is treated as external input because it
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| 62 | * may contain the data provided by VMM. From the sucurity perspective Cfv image
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| 63 | * should be measured before it is consumed.
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| 64 | *
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| 65 | * @retval EFI_SUCCESS Successfully measure the CFV image
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| 66 | * @retval Others Other error as indicated
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| 67 | */
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| 68 | EFI_STATUS
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| 69 | EFIAPI
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| 70 | TdxHelperMeasureCfvImage (
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| 71 | VOID
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| 72 | )
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| 73 | {
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| 74 | return EFI_UNSUPPORTED;
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| 75 | }
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| 76 |
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| 77 | /**
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| 78 | Build the GuidHob for tdx measurements which were done in SEC phase.
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| 79 | The measurement values are stored in WorkArea.
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| 80 |
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| 81 | @retval EFI_SUCCESS The GuidHob is built successfully
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| 82 | @retval Others Other errors as indicated
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| 83 | **/
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| 84 | EFI_STATUS
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| 85 | EFIAPI
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| 86 | TdxHelperBuildGuidHobForTdxMeasurement (
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| 87 | VOID
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| 88 | )
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| 89 | {
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| 90 | return InternalBuildGuidHobForTdxMeasurement ();
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| 91 | }
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