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+/** @file
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+ TdxHelper Functions which are used in SEC phase
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+
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+ Copyright (c) 2022 - 2023, Intel Corporation. All rights reserved.<BR>
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+
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+ SPDX-License-Identifier: BSD-2-Clause-Patent
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+
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+**/
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+
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+#include <PiPei.h>
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+
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+/**
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+ In Tdx guest, some information need to be passed from host VMM to guest
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+ firmware. For example, the memory resource, etc. These information are
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+ prepared by host VMM and put in TdHob which is described in TdxMetadata.
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+ TDVF processes the TdHob to accept memories.
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+
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+ @retval EFI_SUCCESS Successfully process the TdHob
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+ @retval Others Other error as indicated
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+**/
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+EFI_STATUS
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+EFIAPI
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+TdxHelperProcessTdHob (
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+ VOID
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+ )
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+{
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+ return EFI_UNSUPPORTED;
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+}
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+
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+/**
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+ In Tdx guest, TdHob is passed from host VMM to guest firmware and it contains
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+ the information of the memory resource. From the security perspective before
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+ it is consumed, it should be measured and extended.
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+ *
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+ * @retval EFI_SUCCESS Successfully measure the TdHob
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+ * @retval Others Other error as indicated
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+ */
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+EFI_STATUS
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+EFIAPI
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+TdxHelperMeasureTdHob (
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+ VOID
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+ )
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+{
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+ return EFI_UNSUPPORTED;
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+}
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+
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+/**
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+ * In Tdx guest, Configuration FV (CFV) is treated as external input because it
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+ * may contain the data provided by VMM. From the sucurity perspective Cfv image
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+ * should be measured before it is consumed.
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+ *
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+ * @retval EFI_SUCCESS Successfully measure the CFV image
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+ * @retval Others Other error as indicated
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+ */
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+EFI_STATUS
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+EFIAPI
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+TdxHelperMeasureCfvImage (
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+ VOID
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+ )
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+{
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+ return EFI_UNSUPPORTED;
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+}
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+
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+/**
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+ Build the GuidHob for tdx measurements which were done in SEC phase.
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+ The measurement values are stored in WorkArea.
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+
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+ @retval EFI_SUCCESS The GuidHob is built successfully
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+ @retval Others Other errors as indicated
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+**/
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+EFI_STATUS
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+EFIAPI
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+TdxHelperBuildGuidHobForTdxMeasurement (
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+ VOID
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+ )
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+{
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+ return EFI_UNSUPPORTED;
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+}
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