RFC： https://bugzilla.tianocore.org/show_bug.cgi?id=3429
VmTdExitLib performs the necessary processing to handle a #VE exception.
VmTdExitLibNull is a NULL instance of VmTdExitLib which provides a default
limited interface. A full feature version of VmTdExitLib should be created
later (for example in OvmfPkg).
PcdTdxIsEnabled indicates if Tdx is enabled.
Cc: Brijesh Singh <brijesh.si...@amd.com>
Cc: Erdem Aktas <erdemak...@google.com>
Cc: James Bottomley <j...@linux.ibm.com>
Cc: Jiewen Yao <jiewen....@intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: Eric Dong <eric.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Rahul Kumar <rahul1.ku...@intel.com>
Signed-off-by: Min Xu <min.m...@intel.com>
---
UefiCpuPkg/Include/Library/VmTdExitLib.h | 47 +++++++++++++++++++
.../Library/VmTdExitLibNull/VmTdExitLibNull.c | 37 +++++++++++++++
.../VmTdExitLibNull/VmTdExitLibNull.inf | 34 ++++++++++++++
UefiCpuPkg/UefiCpuPkg.dec | 9 ++++
UefiCpuPkg/UefiCpuPkg.dsc | 2 +
5 files changed, 129 insertions(+)
create mode 100644 UefiCpuPkg/Include/Library/VmTdExitLib.h
create mode 100644 UefiCpuPkg/Library/VmTdExitLibNull/VmTdExitLibNull.c
create mode 100644 UefiCpuPkg/Library/VmTdExitLibNull/VmTdExitLibNull.inf
diff --git a/UefiCpuPkg/Include/Library/VmTdExitLib.h
b/UefiCpuPkg/Include/Library/VmTdExitLib.h
new file mode 100644
index 000000000000..a55a76dc7a30
--- /dev/null
+++ b/UefiCpuPkg/Include/Library/VmTdExitLib.h
@@ -0,0 +1,47 @@
+/** @file
+ Public header file for the VMTDEXIT Support library class.
+
+ This library class defines some routines used when invoking the VMEXIT
+ instruction in support of VMX and TDX to handle #VE exceptions.
+
+ Copyright (c) 2020 - 2021, Intel Inc. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef VMTD_EXIT_LIB_H_
+#define VMTD_EXIT_LIB_H_
+
+#include <Library/BaseLib.h>
+#include <Uefi/UefiBaseType.h>
+#include <Protocol/DebugSupport.h>
+
+#define VE_EXCEPTION 20
+
+/**
+ Handle a #VE exception.
+
+ Performs the necessary processing to handle a #VE exception.
+
+ The base library function returns an error equal to VE_EXCEPTION,
+ to be propagated to the standard exception handling stack.
+
+ @param[in, out] ExceptionType Pointer to an EFI_EXCEPTION_TYPE to be set
+ as value to use on error.
+ @param[in, out] SystemContext Pointer to EFI_SYSTEM_CONTEXT
+
+ @retval EFI_SUCCESS Exception handled
+ @retval EFI_UNSUPPORTED #VE not supported, (new) exception value to
+ propagate provided
+ @retval EFI_PROTOCOL_ERROR #VE handling failed, (new) exception value to
+ propagate provided
+
+**/
+EFI_STATUS
+EFIAPI
+VmTdExitHandleVe (
+ IN OUT EFI_EXCEPTION_TYPE *ExceptionType,
+ IN OUT EFI_SYSTEM_CONTEXT SystemContext
+ );
+
+#endif
diff --git a/UefiCpuPkg/Library/VmTdExitLibNull/VmTdExitLibNull.c
b/UefiCpuPkg/Library/VmTdExitLibNull/VmTdExitLibNull.c
new file mode 100644
index 000000000000..a632abfab498
--- /dev/null
+++ b/UefiCpuPkg/Library/VmTdExitLibNull/VmTdExitLibNull.c
@@ -0,0 +1,37 @@
+/** @file
+
+ Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+#include <Library/BaseLib.h>
+#include <Library/VmTdExitLib.h>
+
+/**
+ Handle a #VE exception.
+
+ Performs the necessary processing to handle a #VE exception.
+
+ @param[in, out] ExceptionType Pointer to an EFI_EXCEPTION_TYPE to be set
+ as value to use on error.
+ @param[in, out] SystemContext Pointer to EFI_SYSTEM_CONTEXT
+
+ @retval EFI_SUCCESS Exception handled
+ @retval EFI_UNSUPPORTED #VE not supported, (new) exception value to
+ propagate provided
+ @retval EFI_PROTOCOL_ERROR #VE handling failed, (new) exception value to
+ propagate provided
+
+**/
+EFI_STATUS
+EFIAPI
+VmTdExitHandleVe (
+ IN OUT EFI_EXCEPTION_TYPE *ExceptionType,
+ IN OUT EFI_SYSTEM_CONTEXT SystemContext
+ )
+{
+ *ExceptionType = VE_EXCEPTION;
+
+ return EFI_UNSUPPORTED;
+}
diff --git a/UefiCpuPkg/Library/VmTdExitLibNull/VmTdExitLibNull.inf
b/UefiCpuPkg/Library/VmTdExitLibNull/VmTdExitLibNull.inf
new file mode 100644
index 000000000000..ae9af1b7f56b
--- /dev/null
+++ b/UefiCpuPkg/Library/VmTdExitLibNull/VmTdExitLibNull.inf
@@ -0,0 +1,34 @@
+## @file
+# VMTDEXIT Support Library.
+#
+# Copyright (c) 2020, Intel Inc. All rights reserved.<BR>
+# Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = VmTdExitLibNull
+ FILE_GUID = 79BD5323-6CF4-4ECF-A132-F7D31EEADC1E
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = VmTdExitLib
+
+#
+# The following information is for reference only and not required by the
build tools.
+#
+# VALID_ARCHITECTURES = X64 IA32
+#
+
+[Sources.common]
+ VmTdExitLibNull.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ BaseMemoryLib
+ DebugLib
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index 62acb291f309..fdc7f9ff48e9 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -62,6 +62,9 @@
## @libraryclass Provides function for loading microcode.
MicrocodeLib|Include/Library/MicrocodeLib.h
+ ## @libraryclass Provides function to support VMTDEXIT processing.
+ VmgExitLib|Include/Library/VmTdExitLib.h
+
[Guids]
gUefiCpuPkgTokenSpaceGuid = { 0xac05bf33, 0x995a, 0x4ed4, { 0xaa, 0xb8,
0xef, 0x7a, 0xe8, 0xf, 0x5c, 0xb0 }}
gMsegSmramGuid = { 0x5802bce4, 0xeeee, 0x4e33, { 0xa1, 0x30,
0xeb, 0xad, 0x27, 0xf0, 0xe4, 0x39 }}
@@ -396,5 +399,11 @@
# @Prompt SEV-ES Status
gUefiCpuPkgTokenSpaceGuid.PcdSevEsIsEnabled|FALSE|BOOLEAN|0x60000016
+ ## This dynamic PCD indicates whether Intel TDX is enabled
+ # TRUE - Intel TDX is enabled
+ # FALSE - Intel TDX is not enabled
+ # @Prompt Intel TDX Status
+ gUefiCpuPkgTokenSpaceGuid.PcdTdxIsEnabled|FALSE|BOOLEAN|0x60000017
+
[UserExtensions.TianoCore."ExtraFiles"]
UefiCpuPkgExtra.uni
diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
index 47768b10d5be..a7853f6f6097 100644
--- a/UefiCpuPkg/UefiCpuPkg.dsc
+++ b/UefiCpuPkg/UefiCpuPkg.dsc
@@ -60,6 +60,7 @@
PeCoffExtraActionLib|MdePkg/Library/BasePeCoffExtraActionLibNull/BasePeCoffExtraActionLibNull.inf
TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
VmgExitLib|UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.inf
+ VmTdExitLib|UefiCpuPkg/Library/VmTdExitLibNull/VmTdExitLibNull.inf
MicrocodeLib|UefiCpuPkg/Library/MicrocodeLib/MicrocodeLib.inf
TdxProbeLib|MdePkg/Library/TdxProbeLib/TdxProbeLib.inf
TdxLib|MdePkg/Library/TdxLib/TdxLib.inf
@@ -160,6 +161,7 @@
UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLibStm.inf
UefiCpuPkg/Library/SmmCpuFeaturesLib/StandaloneMmCpuFeaturesLib.inf
UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.inf
+ UefiCpuPkg/Library/VmTdExitLibNull/VmTdExitLibNull.inf
UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationPei.inf
UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationSmm.inf
UefiCpuPkg/SecCore/SecCore.inf
--
2.29.2.windows.2
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