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UefiCpuPkg/AmdSvsmLib: Create the AmdSvsmLib library to support an SVSM

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654

In order to support an SEV-SNP guest running under an SVSM at VMPL1 or
lower, a new library must be created.

This library includes an interface to detect if running under an SVSM, an
interface to return the current VMPL, an interface to perform memory
validation and an interface to set or clear the attribute that allows a
page to be used as a VMSA.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Ray Ni <ray.ni@intel.com>
This commit is contained in:
Tom Lendacky 2024-03-08 07:31:32 -08:00 committed by mergify[bot]
parent c0bf953fe8
commit 30d274e354
6 changed files with 255 additions and 1 deletions
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101
UefiCpuPkg/Include/Library/AmdSvsmLib.h Normal file
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@ -0,0 +1,101 @@
/** @file
Public header file for the AmdSvsmLib.
This library class defines some routines used for invoking an SVSM when the
guest is not running at VMPL0.
Copyright (C) 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef AMD_SVSM_LIB_H_
#define AMD_SVSM_LIB_H_
#include <Protocol/DebugSupport.h>
#include <Register/Amd/Ghcb.h>
/**
Report the presence of an Secure Virtual Services Module (SVSM).
Determines the presence of an SVSM.
@retval TRUE An SVSM is present
@retval FALSE An SVSM is not present
**/
BOOLEAN
EFIAPI
AmdSvsmIsSvsmPresent (
VOID
);
/**
Report the VMPL level at which the SEV-SNP guest is running.
Determines the VMPL level at which the guest is running. If an SVSM is
not present, then it must be VMPL0, otherwise return what is reported
by the SVSM.
@return The VMPL level
**/
UINT8
EFIAPI
AmdSvsmSnpGetVmpl (
VOID
);
/**
Report the Calling Area address (CAA) for the BSP of the SEV-SNP guest.
If an SVSM is present, the CAA for the BSP is returned.
@return The CAA
**/
UINT64
EFIAPI
AmdSvsmSnpGetCaa (
VOID
);
/**
Perform a PVALIDATE operation for the page ranges specified.
Validate or rescind the validation of the specified pages.
@param[in] Info Pointer to a page state change structure
**/
VOID
EFIAPI
AmdSvsmSnpPvalidate (
IN SNP_PAGE_STATE_CHANGE_INFO *Info
);
/**
Perform an RMPADJUST operation to alter the VMSA setting of a page.
Add or remove the VMSA attribute for a page.
@param[in] Vmsa Pointer to an SEV-ES save area page
@param[in] ApicId APIC ID associated with the VMSA
@param[in] SetVmsa Boolean indicator as to whether to set or
or clear the VMSA setting for the page
@retval EFI_SUCCESS RMPADJUST operation successful
@retval EFI_UNSUPPORTED Operation is not supported
@retval EFI_INVALID_PARAMETER RMPADJUST operation failed, an invalid
parameter was supplied
**/
EFI_STATUS
EFIAPI
AmdSvsmSnpVmsaRmpAdjust (
IN SEV_ES_SAVE_AREA *Vmsa,
IN UINT32 ApicId,
IN BOOLEAN SetVmsa
);
#endif

108
UefiCpuPkg/Library/AmdSvsmLibNull/AmdSvsmLibNull.c Normal file
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/** @file
AmdSvsm Base Support Library.
Copyright (C) 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Base.h>
#include <Uefi.h>
#include <Library/AmdSvsmLib.h>
/**
Report the presence of an Secure Virtual Services Module (SVSM).
Determines the presence of an SVSM.
@retval TRUE An SVSM is present
@retval FALSE An SVSM is not present
**/
BOOLEAN
EFIAPI
AmdSvsmIsSvsmPresent (
VOID
)
{
return FALSE;
}
/**
Report the VMPL level at which the SEV-SNP guest is running.
Determines the VMPL level at which the guest is running. If an SVSM is
not present, then it must be VMPL0, otherwise return what is reported
by the SVSM.
@return The VMPL level
**/
UINT8
EFIAPI
AmdSvsmSnpGetVmpl (
VOID
)
{
return 0;
}
/**
Report the Calling Area address (CAA) for the BSP of the SEV-SNP guest.
If an SVSM is present, the CAA for the BSP is returned.
@return The CAA
**/
UINT64
EFIAPI
AmdSvsmSnpGetCaa (
VOID
)
{
return 0;
}
/**
Perform a PVALIDATE operation for the page ranges specified.
Validate or rescind the validation of the specified pages.
@param[in] Info Pointer to a page state change structure
**/
VOID
EFIAPI
AmdSvsmSnpPvalidate (
IN SNP_PAGE_STATE_CHANGE_INFO *Info
)
{
}
/**
Perform an RMPADJUST operation to alter the VMSA setting of a page.
Add or remove the VMSA attribute for a page.
@param[in] Vmsa Pointer to an SEV-ES save area page
@param[in] ApicId APIC ID associated with the VMSA
@param[in] SetVmsa Boolean indicator as to whether to set or
or clear the VMSA setting for the page
@retval EFI_SUCCESS RMPADJUST operation successful
@retval EFI_UNSUPPORTED Operation is not supported
@retval EFI_INVALID_PARAMETER RMPADJUST operation failed, an invalid
parameter was supplied
**/
EFI_STATUS
EFIAPI
AmdSvsmSnpVmsaRmpAdjust (
IN SEV_ES_SAVE_AREA *Vmsa,
IN UINT32 ApicId,
IN BOOLEAN SetVmsa
)
{
return EFI_UNSUPPORTED;
}

27
UefiCpuPkg/Library/AmdSvsmLibNull/AmdSvsmLibNull.inf Normal file
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@ -0,0 +1,27 @@
## @file
# AmdSvsm Base Support Library.
#
# Copyright (C) 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
##
[Defines]
INF_VERSION = 1.29
BASE_NAME = AmdSvsmLibNull
MODULE_UNI_FILE = AmdSvsmLibNull.uni
FILE_GUID = 62b45e0f-c9b4-45ce-a5b3-41762709b3d9
MODULE_TYPE = BASE
VERSION_STRING = 1.0
LIBRARY_CLASS = AmdSvsmLib
[Sources.common]
AmdSvsmLibNull.c
[Packages]
MdePkg/MdePkg.dec
UefiCpuPkg/UefiCpuPkg.dec
[LibraryClasses]
BaseLib

13
UefiCpuPkg/Library/AmdSvsmLibNull/AmdSvsmLibNull.uni Normal file
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@ -0,0 +1,13 @@
// /** @file
// AmdSvsmLib instance.
//
// Copyright (C) 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
// SPDX-License-Identifier: BSD-2-Clause-Patent
//
// **/
#string STR_MODULE_ABSTRACT #language en-US "AmdSvsmLib NULL instance"
#string STR_MODULE_DESCRIPTION #language en-US "AmdSvsmLib NULL instance."

3
UefiCpuPkg/UefiCpuPkg.dec
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@ -53,6 +53,9 @@
## @libraryclass Provides function to support CcExit processing.
CcExitLib|Include/Library/CcExitLib.h
## @libraryclass Provides function to support AmdSvsm processing.
AmdSvsmLib|Include/Library/AmdSvsmLib.h
## @libraryclass Provides function to get CPU cache information.
CpuCacheInfoLib|Include/Library/CpuCacheInfoLib.h

4
UefiCpuPkg/UefiCpuPkg.dsc
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@ -2,7 +2,7 @@
# UefiCpuPkg Package
#
# Copyright (c) 2007 - 2023, Intel Corporation. All rights reserved.<BR>
# Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.<BR>
# Copyright (C) 2023 - 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
@ -61,6 +61,7 @@
PeCoffExtraActionLib|MdePkg/Library/BasePeCoffExtraActionLibNull/BasePeCoffExtraActionLibNull.inf
TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
CcExitLib|UefiCpuPkg/Library/CcExitLibNull/CcExitLibNull.inf
AmdSvsmLib|UefiCpuPkg/Library/AmdSvsmLibNull/AmdSvsmLibNull.inf
MicrocodeLib|UefiCpuPkg/Library/MicrocodeLib/MicrocodeLib.inf
SmmCpuRendezvousLib|UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.inf
CpuPageTableLib|UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableLib.inf
@ -162,6 +163,7 @@
UefiCpuPkg/Library/SmmCpuFeaturesLib/StandaloneMmCpuFeaturesLib.inf
UefiCpuPkg/Library/SmmCpuSyncLib/SmmCpuSyncLib.inf
UefiCpuPkg/Library/CcExitLibNull/CcExitLibNull.inf
UefiCpuPkg/Library/AmdSvsmLibNull/AmdSvsmLibNull.inf
UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationPei.inf
UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationSmm.inf
UefiCpuPkg/SecCore/SecCore.inf