5aa8018639
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 Add Intel Tdx helper library. The library provides the routines to: - set or clear Shared bit for a given memory region. - query whether TDX is enabled. Please be noted, there a lot of duplicated codes for Page Table operations. These codes should be moved to a common library (PageTablesLib) so that it is more friendly for review and maintain. There is a new feature requirement https://bugzilla.tianocore.org/show_bug.cgi?id=847 which is to implement the library. After the lib is introduced, BaseMemEncryptTdxLib will be refactored. Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Jordan Justen <jordan.l.justen@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> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>
91 lines
3.0 KiB
C
91 lines
3.0 KiB
C
/** @file
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Virtual Memory Management Services to set or clear the memory encryption
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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Code is derived from MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c
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**/
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#include <Uefi.h>
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#include <Uefi/UefiBaseType.h>
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#include <Library/BaseLib.h>
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#include <Library/MemEncryptTdxLib.h>
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/**
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Returns boolean to indicate whether to indicate which, if any, memory encryption is enabled
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@param[in] Type Bitmask of encryption technologies to check is enabled
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@retval TRUE The encryption type(s) are enabled
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@retval FALSE The encryption type(s) are not enabled
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**/
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BOOLEAN
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EFIAPI
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MemEncryptTdxIsEnabled (
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VOID
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)
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{
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return FALSE;
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}
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/**
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This function clears memory encryption bit for the memory region specified by
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BaseAddress and NumPages from the current page table context.
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@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
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current CR3)
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@param[in] BaseAddress The physical address that is the start
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address of a memory region.
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@param[in] NumPages The number of pages from start memory
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region.
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@retval RETURN_SUCCESS The attributes were cleared for the
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memory region.
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@retval RETURN_INVALID_PARAMETER Number of pages is zero.
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@retval RETURN_UNSUPPORTED Clearing the memory encryption attribute
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is not supported
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**/
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RETURN_STATUS
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EFIAPI
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MemEncryptTdxSetPageSharedBit (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS BaseAddress,
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IN UINTN NumPages
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)
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{
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return EFI_UNSUPPORTED;
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}
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/**
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This function sets memory encryption bit for the memory region specified by
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BaseAddress and NumPages from the current page table context.
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@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
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current CR3)
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@param[in] BaseAddress The physical address that is the start
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address of a memory region.
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@param[in] NumPages The number of pages from start memory
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region.
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@retval RETURN_SUCCESS The attributes were set for the memory
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region.
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@retval RETURN_INVALID_PARAMETER Number of pages is zero.
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@retval RETURN_UNSUPPORTED Setting the memory encryption attribute
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is not supported
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**/
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RETURN_STATUS
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EFIAPI
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MemEncryptTdxClearPageSharedBit (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS BaseAddress,
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IN UINTN NumPages
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)
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{
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return EFI_UNSUPPORTED;
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}
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