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47001ab989
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654 The SVSM specification documents an alternative method of discovery for the SVSM using a reserved CPUID bit and a reserved MSR. For the CPUID support, the #VC handler of an SEV-SNP guest should modify the returned value in the EAX register for the 0x8000001f CPUID function by setting bit 28 when an SVSM is present. For the MSR support, new reserved MSR 0xc001f000 has been defined. A #VC should be generated when accessing this MSR. The #VC handler is expected to ignore writes to this MSR and return the physical calling area address (CAA) on reads of this MSR. Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Erdem Aktas <erdemaktas@google.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Michael Roth <michael.roth@amd.com> Cc: Min Xu <min.m.xu@intel.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
51 lines
1.2 KiB
INI
51 lines
1.2 KiB
INI
## @file
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# VMGEXIT Support Library.
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#
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# Copyright (C) 2020 - 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
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# SPDX-License-Identifier: BSD-2-Clause-Patent
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#
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##
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[Defines]
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INF_VERSION = 0x00010005
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BASE_NAME = SecCcExitLib
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FILE_GUID = dafff819-f86c-4cff-a70e-83161e5bcf9a
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MODULE_TYPE = BASE
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VERSION_STRING = 1.0
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LIBRARY_CLASS = CcExitLib|SEC
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#
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# The following information is for reference only and not required by the build tools.
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#
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# VALID_ARCHITECTURES = X64
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#
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[Sources.common]
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CcExitLib.c
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CcExitVcHandler.c
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CcExitVcHandler.h
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CcInstruction.c
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SecCcExitVcHandler.c
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CcExitVeHandler.c
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X64/TdVmcallCpuid.nasm
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[Packages]
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MdePkg/MdePkg.dec
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OvmfPkg/OvmfPkg.dec
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UefiCpuPkg/UefiCpuPkg.dec
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[LibraryClasses]
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BaseLib
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BaseMemoryLib
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DebugLib
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LocalApicLib
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MemEncryptSevLib
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PcdLib
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AmdSvsmLib
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[FixedPcd]
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBackupBase
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBackupSize
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidBase
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gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidSize
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