[PATCH V4 03/31] MdePkg: Add TdxLib to wrap Tdx operations

["Min Xu" <min.m.xu@intel.com>]

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

TdxLib is created with functions to perform the related Tdx operation.
This includes functions for:
 - TdAcceptPages   : Accept pending private pages and initialize the pages
                     to all-0 using the TD ephemeral private key.
 - TdExtendRtmr    : Extend measurement to one of the RTMR registers.
 - TdSharedPageMask: Get the Td guest shared page mask which indicates it
                     is a Shared or Private page.
 - TdMaxVCpuNum    : Get the maximum number of virtual CPUs.
 - TdVCpuNum       : Get the number of virtual CPUs.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@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>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
 MdePkg/Include/Library/TdxLib.h     |  97 +++++++++++++++
 MdePkg/Library/TdxLib/AcceptPages.c | 180 ++++++++++++++++++++++++++++
 MdePkg/Library/TdxLib/Rtmr.c        |  83 +++++++++++++
 MdePkg/Library/TdxLib/TdInfo.c      | 114 ++++++++++++++++++
 MdePkg/Library/TdxLib/TdxLib.inf    |  37 ++++++
 MdePkg/Library/TdxLib/TdxLibNull.c  | 107 +++++++++++++++++
 MdePkg/MdePkg.dec                   |   3 +
 MdePkg/MdePkg.dsc                   |   1 +
 8 files changed, 622 insertions(+)
 create mode 100644 MdePkg/Include/Library/TdxLib.h
 create mode 100644 MdePkg/Library/TdxLib/AcceptPages.c
 create mode 100644 MdePkg/Library/TdxLib/Rtmr.c
 create mode 100644 MdePkg/Library/TdxLib/TdInfo.c
 create mode 100644 MdePkg/Library/TdxLib/TdxLib.inf
 create mode 100644 MdePkg/Library/TdxLib/TdxLibNull.c

diff --git a/MdePkg/Include/Library/TdxLib.h b/MdePkg/Include/Library/TdxLib.h
new file mode 100644
index 000000000000..86539460c9f9
--- /dev/null
+++ b/MdePkg/Include/Library/TdxLib.h
@@ -0,0 +1,97 @@
+/** @file
+  TdxLib definitions
+
+  Copyright (c) 2020 - 2021, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef TDX_LIB_H_
+#define TDX_LIB_H_
+
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Uefi/UefiBaseType.h>
+#include <Protocol/DebugSupport.h>
+
+/**
+  This function accepts a pending private page, and initialize the page to
+  all-0 using the TD ephemeral private key.
+
+  @param[in]  StartAddress     Guest physical address of the private page
+                               to accept. [63:52] and [11:0] must be 0.
+  @param[in]  NumberOfPages    Number of the pages to be accepted.
+  @param[in]  PageSize         GPA page size. Accept 2M/4K page size.
+
+  @return EFI_SUCCESS
+**/
+EFI_STATUS
+EFIAPI
+TdAcceptPages (
+  IN UINT64  StartAddress,
+  IN UINT64  NumberOfPages,
+  IN UINT32  PageSize
+  );
+
+/**
+  This function extends one of the RTMR measurement register
+  in TDCS with the provided extension data in memory.
+  RTMR extending supports SHA384 which length is 48 bytes.
+
+  @param[in]  Data      Point to the data to be extended
+  @param[in]  DataLen   Length of the data. Must be 48
+  @param[in]  Index     RTMR index
+
+  @return EFI_SUCCESS
+  @return EFI_INVALID_PARAMETER
+  @return EFI_DEVICE_ERROR
+
+**/
+EFI_STATUS
+EFIAPI
+TdExtendRtmr (
+  IN  UINT32  *Data,
+  IN  UINT32  DataLen,
+  IN  UINT8   Index
+  );
+
+/**
+  This function gets the Td guest shared page mask.
+
+  The guest indicates if a page is shared using the Guest Physical Address
+  (GPA) Shared (S) bit. If the GPA Width(GPAW) is 48, the S-bit is bit-47.
+  If the GPAW is 52, the S-bit is bit-51.
+
+  @return Shared page bit mask
+**/
+UINT64
+EFIAPI
+TdSharedPageMask (
+  VOID
+  );
+
+/**
+  This function gets the maximum number of Virtual CPUs that are usable for
+  Td Guest.
+
+  @return maximum Virtual CPUs number
+**/
+UINT32
+EFIAPI
+TdMaxVCpuNum (
+  VOID
+  );
+
+/**
+  This function gets the number of Virtual CPUs that are usable for Td
+  Guest.
+
+  @return Virtual CPUs number
+**/
+UINT32
+EFIAPI
+TdVCpuNum (
+  VOID
+  );
+
+#endif
diff --git a/MdePkg/Library/TdxLib/AcceptPages.c b/MdePkg/Library/TdxLib/AcceptPages.c
new file mode 100644
index 000000000000..651d47a8d8a1
--- /dev/null
+++ b/MdePkg/Library/TdxLib/AcceptPages.c
@@ -0,0 +1,180 @@
+/** @file
+
+  Unaccepted memory is a special type of private memory. In Td guest
+  TDCALL [TDG.MEM.PAGE.ACCEPT] is invoked to accept the unaccepted
+  memory before use it.
+
+  Copyright (c) 2020 - 2021, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <IndustryStandard/Tdx.h>
+#include <Library/TdxLib.h>
+#include <Library/BaseMemoryLib.h>
+
+UINT64  mNumberOfDuplicatedAcceptedPages;
+
+#define TDX_ACCEPTPAGE_MAX_RETRIED  3
+
+// PageSize is mapped to PageLevel like below:
+// 4KB - 0, 2MB - 1
+UINT32  mTdxAcceptPageLevelMap[2] = {
+  SIZE_4KB,
+  SIZE_2MB
+};
+
+#define INVALID_ACCEPT_PAGELEVEL  ARRAY_SIZE(mTdxAcceptPageLevelMap)
+
+/**
+  This function gets the PageLevel according to the input page size.
+
+  @param[in]  PageSize    Page size
+
+  @return UINT32          The mapped page level
+**/
+UINT32
+GetGpaPageLevel (
+  UINT32  PageSize
+  )
+{
+  UINT32  Index;
+
+  for (Index = 0; Index < ARRAY_SIZE (mTdxAcceptPageLevelMap); Index++) {
+    if (mTdxAcceptPageLevelMap[Index] == PageSize) {
+      break;
+    }
+  }
+
+  return Index;
+}
+
+/**
+  This function accept a pending private page, and initialize the page to
+  all-0 using the TD ephemeral private key.
+
+  Sometimes TDCALL [TDG.MEM.PAGE.ACCEPT] may return
+  TDX_EXIT_REASON_PAGE_SIZE_MISMATCH. It indicates the input PageLevel is
+  not workable. In this case we need to try to fallback to a smaller
+  PageLevel if possible.
+
+  @param[in]  StartAddress      Guest physical address of the private
+                                page to accept. [63:52] and [11:0] must be 0.
+  @param[in]  NumberOfPages     Number of the pages to be accepted.
+  @param[in]  PageSize          GPA page size. Only accept 2M/4K size.
+
+  @return EFI_SUCCESS           Accept successfully
+  @return others                Indicate other errors
+**/
+EFI_STATUS
+EFIAPI
+TdAcceptPages (
+  IN UINT64  StartAddress,
+  IN UINT64  NumberOfPages,
+  IN UINT32  PageSize
+  )
+{
+  EFI_STATUS  Status;
+  UINT64      Address;
+  UINT64      TdxStatus;
+  UINT64      Index;
+  UINT32      GpaPageLevel;
+  UINT32      PageSize2;
+  UINTN       Retried;
+
+  Retried = 0;
+
+  if ((StartAddress & ~0xFFFFFFFFFF000ULL) != 0) {
+    ASSERT (FALSE);
+    DEBUG ((DEBUG_ERROR, "Accept page address(0x%llx) is not valid. [63:52] and [11:0] must be 0\n", StartAddress));
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Address = StartAddress;
+
+  GpaPageLevel = GetGpaPageLevel (PageSize);
+  if (GpaPageLevel == INVALID_ACCEPT_PAGELEVEL) {
+    ASSERT (FALSE);
+    DEBUG ((DEBUG_ERROR, "Accept page size must be 4K/2M. Invalid page size - 0x%llx\n", PageSize));
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Status = EFI_SUCCESS;
+  for (Index = 0; Index < NumberOfPages; Index++) {
+    Retried = 0;
+
+DoAcceptPage:
+    TdxStatus = TdCall (TDCALL_TDACCEPTPAGE, Address | GpaPageLevel, 0, 0, 0);
+    if (TdxStatus != TDX_EXIT_REASON_SUCCESS) {
+      if ((TdxStatus & ~0xFFFFULL) == TDX_EXIT_REASON_PAGE_ALREADY_ACCEPTED) {
+        //
+        // Already accepted
+        //
+        mNumberOfDuplicatedAcceptedPages++;
+        DEBUG ((DEBUG_WARN, "Page at Address (0x%llx) has already been accepted. - %d\n", Address, mNumberOfDuplicatedAcceptedPages));
+      } else if ((TdxStatus & ~0xFFFFULL) == TDX_EXIT_REASON_PAGE_SIZE_MISMATCH) {
+        //
+        // GpaPageLevel is mismatch, fall back to a smaller GpaPageLevel if possible
+        //
+        DEBUG ((DEBUG_VERBOSE, "Address %llx cannot be accepted in PageLevel of %d\n", Address, GpaPageLevel));
+
+        if (GpaPageLevel == 0) {
+          //
+          // Cannot fall back to smaller page level
+          //
+          DEBUG ((DEBUG_ERROR, "AcceptPage cannot fallback from PageLevel %d\n", GpaPageLevel));
+          Status = EFI_INVALID_PARAMETER;
+          break;
+        } else {
+          //
+          // Fall back to a smaller page size
+          //
+          PageSize2 = mTdxAcceptPageLevelMap[GpaPageLevel - 1];
+          Status    = TdAcceptPages (Address, 512, PageSize2);
+          if (EFI_ERROR (Status)) {
+            break;
+          }
+        }
+      } else if ((TdxStatus & ~0xFFFFULL) == TDX_EXIT_REASON_OPERAND_BUSY) {
+        //
+        // Concurrent TDG.MEM.PAGE.ACCEPT is using the same Secure EPT entry
+        // So try it again. There is a max retried count. If Retried exceeds the max count,
+        // report the error and quit.
+        //
+        Retried += 1;
+        if (Retried > TDX_ACCEPTPAGE_MAX_RETRIED) {
+          DEBUG ((
+            DEBUG_ERROR,
+            "Address %llx (%d) failed to be accepted because of OPERAND_BUSY. Retried %d time.\n",
+            Address,
+            Index,
+            Retried
+            ));
+          Status = EFI_INVALID_PARAMETER;
+          break;
+        } else {
+          goto DoAcceptPage;
+        }
+      } else {
+        //
+        // Other errors
+        //
+        DEBUG ((
+          DEBUG_ERROR,
+          "Address %llx (%d) failed to be accepted. Error = 0x%llx\n",
+          Address,
+          Index,
+          TdxStatus
+          ));
+        Status = EFI_INVALID_PARAMETER;
+        break;
+      }
+    }
+
+    Address += PageSize;
+  }
+
+  return Status;
+}
diff --git a/MdePkg/Library/TdxLib/Rtmr.c b/MdePkg/Library/TdxLib/Rtmr.c
new file mode 100644
index 000000000000..bdc91b3ebe6a
--- /dev/null
+++ b/MdePkg/Library/TdxLib/Rtmr.c
@@ -0,0 +1,83 @@
+/** @file
+
+  Extends one of the RTMR measurement registers in TDCS with the provided
+  extension data in memory.
+
+  Copyright (c) 2020 - 2021, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/TdxLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <IndustryStandard/Tpm20.h>
+#include <IndustryStandard/Tdx.h>
+
+#define RTMR_COUNT            4
+#define TD_EXTEND_BUFFER_LEN  (64 + 48)
+
+UINT8  mExtendBuffer[TD_EXTEND_BUFFER_LEN];
+
+/**
+  This function extends one of the RTMR measurement register
+  in TDCS with the provided extension data in memory.
+  RTMR extending supports SHA384 which length is 48 bytes.
+
+  @param[in]  Data      Point to the data to be extended
+  @param[in]  DataLen   Length of the data. Must be 48
+  @param[in]  Index     RTMR index
+
+  @return EFI_SUCCESS
+  @return EFI_INVALID_PARAMETER
+  @return EFI_DEVICE_ERROR
+
+**/
+EFI_STATUS
+EFIAPI
+TdExtendRtmr (
+  IN  UINT32  *Data,
+  IN  UINT32  DataLen,
+  IN  UINT8   Index
+  )
+{
+  EFI_STATUS  Status;
+  UINT64      TdCallStatus;
+  UINT8       *ExtendBuffer;
+
+  Status = EFI_SUCCESS;
+
+  ASSERT (Data != NULL);
+  ASSERT (DataLen == SHA384_DIGEST_SIZE);
+  ASSERT (Index >= 0 && Index < RTMR_COUNT);
+
+  if ((Data == NULL) || (DataLen != SHA384_DIGEST_SIZE) || (Index >= RTMR_COUNT)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  // TD.RTMR.EXTEND requires 64B-aligned guest physical address of
+  // 48B-extension data. We use ALIGN_POINTER(Pointer, 64) to get
+  // the 64B-aligned guest physical address.
+  ExtendBuffer = ALIGN_POINTER (mExtendBuffer, 64);
+  ASSERT (((UINTN)ExtendBuffer & 0x3f) == 0);
+
+  ZeroMem (ExtendBuffer, SHA384_DIGEST_SIZE);
+  CopyMem (ExtendBuffer, Data, SHA384_DIGEST_SIZE);
+
+  TdCallStatus = TdCall (TDCALL_TDEXTENDRTMR, (UINT64)(UINTN)ExtendBuffer, Index, 0, 0);
+
+  if (TdCallStatus == TDX_EXIT_REASON_SUCCESS) {
+    Status = EFI_SUCCESS;
+  } else if (TdCallStatus == TDX_EXIT_REASON_OPERAND_INVALID) {
+    Status = EFI_INVALID_PARAMETER;
+  } else {
+    Status = EFI_DEVICE_ERROR;
+  }
+
+  if (Status != EFI_SUCCESS) {
+    DEBUG ((DEBUG_ERROR, "Error returned from TdExtendRtmr call - 0x%lx\n", TdCallStatus));
+  }
+
+  return Status;
+}
diff --git a/MdePkg/Library/TdxLib/TdInfo.c b/MdePkg/Library/TdxLib/TdInfo.c
new file mode 100644
index 000000000000..a40a15116f30
--- /dev/null
+++ b/MdePkg/Library/TdxLib/TdInfo.c
@@ -0,0 +1,114 @@
+/** @file
+
+  Fetch the Tdx info.
+
+  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <IndustryStandard/Tdx.h>
+#include <Library/TdxLib.h>
+#include <Library/BaseMemoryLib.h>
+
+UINT64   mTdSharedPageMask = 0;
+UINT32   mTdMaxVCpuNum     = 0;
+UINT32   mTdVCpuNum        = 0;
+BOOLEAN  mTdDataReturned   = FALSE;
+
+/**
+  This function call TDCALL_TDINFO to get the TD_RETURN_DATA.
+  If the TDCALL is successful, populate below variables:
+   - mTdSharedPageMask
+   - mTdMaxVCpunum
+   - mTdVCpuNum
+   - mTdDataReturned
+
+  @return TRUE  The TDCALL is successful and above variables are populated.
+  @return FALSE The TDCALL is failed. Above variables are not set.
+**/
+BOOLEAN
+GetTdInfo (
+  VOID
+  )
+{
+  UINT64          Status;
+  TD_RETURN_DATA  TdReturnData;
+  UINT8           Gpaw;
+
+  Status = TdCall (TDCALL_TDINFO, 0, 0, 0, &TdReturnData);
+  if (Status == TDX_EXIT_REASON_SUCCESS) {
+    Gpaw              = (UINT8)(TdReturnData.TdInfo.Gpaw & 0x3f);
+    mTdSharedPageMask = 1ULL << (Gpaw - 1);
+    mTdMaxVCpuNum     = TdReturnData.TdInfo.MaxVcpus;
+    mTdVCpuNum        = TdReturnData.TdInfo.NumVcpus;
+    mTdDataReturned   = TRUE;
+  } else {
+    DEBUG ((DEBUG_ERROR, "Failed call TDCALL_TDINFO. %llx\n", Status));
+    mTdDataReturned = FALSE;
+  }
+
+  return mTdDataReturned;
+}
+
+/**
+  This function gets the Td guest shared page mask.
+
+  The guest indicates if a page is shared using the Guest Physical Address
+  (GPA) Shared (S) bit. If the GPA Width(GPAW) is 48, the S-bit is bit-47.
+  If the GPAW is 52, the S-bit is bit-51.
+
+  @return Shared page bit mask
+**/
+UINT64
+EFIAPI
+TdSharedPageMask (
+  VOID
+  )
+{
+  if (mTdDataReturned) {
+    return mTdSharedPageMask;
+  }
+
+  return GetTdInfo () ? mTdSharedPageMask : 0;
+}
+
+/**
+  This function gets the maximum number of Virtual CPUs that are usable for
+  Td Guest.
+
+  @return maximum Virtual CPUs number
+**/
+UINT32
+EFIAPI
+TdMaxVCpuNum (
+  VOID
+  )
+{
+  if (mTdDataReturned) {
+    return mTdMaxVCpuNum;
+  }
+
+  return GetTdInfo () ? mTdMaxVCpuNum : 0;
+}
+
+/**
+  This function gets the number of Virtual CPUs that are usable for Td
+  Guest.
+
+  @return Virtual CPUs number
+**/
+UINT32
+EFIAPI
+TdVCpuNum (
+  VOID
+  )
+{
+  if (mTdDataReturned) {
+    return mTdVCpuNum;
+  }
+
+  return GetTdInfo () ? mTdVCpuNum : 0;
+}
diff --git a/MdePkg/Library/TdxLib/TdxLib.inf b/MdePkg/Library/TdxLib/TdxLib.inf
new file mode 100644
index 000000000000..442e63d079da
--- /dev/null
+++ b/MdePkg/Library/TdxLib/TdxLib.inf
@@ -0,0 +1,37 @@
+## @file
+# Tdx library
+#
+#  Copyright (c) 2020 - 2021, Intel Corporation. All rights reserved.<BR>
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = TdxLib
+  FILE_GUID                      = 032A8E0D-0C27-40C0-9CAA-23B731C1B223
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = TdxLib
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources.IA32]
+  TdxLibNull.c
+
+[Sources.X64]
+  AcceptPages.c
+  Rtmr.c
+  TdInfo.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
diff --git a/MdePkg/Library/TdxLib/TdxLibNull.c b/MdePkg/Library/TdxLib/TdxLibNull.c
new file mode 100644
index 000000000000..83ab929b4a3b
--- /dev/null
+++ b/MdePkg/Library/TdxLib/TdxLibNull.c
@@ -0,0 +1,107 @@
+/** @file
+
+  Null stub of TdxLib
+
+  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/TdxLib.h>
+
+/**
+  This function accepts a pending private page, and initialize the page to
+  all-0 using the TD ephemeral private key.
+
+  @param[in]  StartAddress     Guest physical address of the private page
+                               to accept.
+  @param[in]  NumberOfPages    Number of the pages to be accepted.
+  @param[in]  PageSize         GPA page size. Accept 1G/2M/4K page size.
+
+  @return EFI_SUCCESS
+**/
+EFI_STATUS
+EFIAPI
+TdAcceptPages (
+  IN UINT64  StartAddress,
+  IN UINT64  NumberOfPages,
+  IN UINT32  PageSize
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  This function extends one of the RTMR measurement register
+  in TDCS with the provided extension data in memory.
+  RTMR extending supports SHA384 which length is 48 bytes.
+
+  @param[in]  Data      Point to the data to be extended
+  @param[in]  DataLen   Length of the data. Must be 48
+  @param[in]  Index     RTMR index
+
+  @return EFI_SUCCESS
+  @return EFI_INVALID_PARAMETER
+  @return EFI_DEVICE_ERROR
+
+**/
+EFI_STATUS
+EFIAPI
+TdExtendRtmr (
+  IN  UINT32  *Data,
+  IN  UINT32  DataLen,
+  IN  UINT8   Index
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  This function gets the Td guest shared page mask.
+
+  The guest indicates if a page is shared using the Guest Physical Address
+  (GPA) Shared (S) bit. If the GPA Width(GPAW) is 48, the S-bit is bit-47.
+  If the GPAW is 52, the S-bit is bit-51.
+
+  @return Shared page bit mask
+**/
+UINT64
+EFIAPI
+TdSharedPageMask (
+  VOID
+  )
+{
+  return 0;
+}
+
+/**
+  This function gets the maximum number of Virtual CPUs that are usable for
+  Td Guest.
+
+  @return maximum Virtual CPUs number
+**/
+UINT32
+EFIAPI
+TdMaxVCpuNum (
+  VOID
+  )
+{
+  return 0;
+}
+
+/**
+  This function gets the number of Virtual CPUs that are usable for Td
+  Guest.
+
+  @return Virtual CPUs number
+**/
+UINT32
+EFIAPI
+TdVCpuNum (
+  VOID
+  )
+{
+  return 0;
+}
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 59b405928bf8..1934c9840423 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -296,6 +296,9 @@
   ##  @libraryclass  Provides services to log the SMI handler registration.
   SmiHandlerProfileLib|Include/Library/SmiHandlerProfileLib.h
 
+  ##  @libraryclass  Provides function to support TDX processing.
+  TdxLib|Include/Library/TdxLib.h
+
 [Guids]
   #
   # GUID defined in UEFI2.1/UEFI2.0/EFI1.1
diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index a94959169b2f..d6a7af412be7 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -175,6 +175,7 @@
   MdePkg/Library/SmiHandlerProfileLibNull/SmiHandlerProfileLibNull.inf
   MdePkg/Library/MmServicesTableLib/MmServicesTableLib.inf
   MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf
+  MdePkg/Library/TdxLib/TdxLib.inf
 
 [Components.EBC]
   MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
-- 
2.29.2.windows.2