5ef3b66fec
Based on the following patch from Brijesh Singh <brijesh.singh@amd.com>: [PATCH v2 1/2] OvmfPkg/AmdSevDxe: Clear the C-bit from SMM Saved State http://mid.mail-archive.com/20180228161415.28723-2-brijesh.singh@amd.com https://lists.01.org/pipermail/edk2-devel/2018-February/022016.html Once PiSmmCpuDxeSmm relocates SMBASE for all VCPUs, the pages of the initial SMRAM save state map can be re-encrypted (including zeroing them out after setting the C-bit on them), and they can be released to DXE for general use (undoing the allocation that we did in PlatformPei's AmdSevInitialize() function). The decryption of the same pages (which will occur chronologically earlier) is implemented in the next patch; hence the "re-encryption" part of this patch is currently a no-op. The series is structured like this in order to be bisection-friendly. If the decryption patch preceded this patch, then an info leak would be created while standing between the patches. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Tested-by: Brijesh Singh <brijesh.singh@amd.com> Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
42 lines
1.3 KiB
INI
42 lines
1.3 KiB
INI
## @file
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# The CPU specific programming for PiSmmCpuDxeSmm module.
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#
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# Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
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#
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# This program and the accompanying materials are licensed and made available
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# under the terms and conditions of the BSD License which accompanies this
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# distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR
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# IMPLIED.
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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 = SmmCpuFeaturesLib
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MODULE_UNI_FILE = SmmCpuFeaturesLib.uni
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FILE_GUID = AC9991BE-D77A-464C-A8DE-A873DB8A4836
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MODULE_TYPE = DXE_SMM_DRIVER
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VERSION_STRING = 1.0
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LIBRARY_CLASS = SmmCpuFeaturesLib
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CONSTRUCTOR = SmmCpuFeaturesLibConstructor
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[Sources]
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SmmCpuFeaturesLib.c
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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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MemEncryptSevLib
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SmmServicesTableLib
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UefiBootServicesTableLib
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