901a9bfc3a
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275 The MemEncryptSevClearMmioPageEncMask() helper can be used for clearing the memory encryption mask for the Mmio region. The MemEncryptSevClearMmioPageEncMask() is a simplified version of MemEncryptSevClearPageEncMask() -- it does not flush the caches after clearing the page encryption mask. Cc: James Bottomley <jejb@linux.ibm.com> Cc: Min Xu <min.m.xu@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Erdem Aktas <erdemaktas@google.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Message-Id: <20210519181949.6574-10-brijesh.singh@amd.com>
145 lines
5.3 KiB
C
145 lines
5.3 KiB
C
/** @file
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Secure Encrypted Virtualization (SEV) library helper function
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Copyright (c) 2017 - 2020, AMD Incorporated. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/MemEncryptSevLib.h>
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#include <Register/Amd/Cpuid.h>
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#include <Register/Amd/Msr.h>
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#include <Register/Cpuid.h>
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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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@param[in] Flush Flush the caches before clearing the bit
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(mostly TRUE except MMIO addresses)
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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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MemEncryptSevClearPageEncMask (
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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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IN BOOLEAN Flush
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)
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{
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//
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// Memory encryption bit is not accessible in 32-bit mode
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//
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return RETURN_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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@param[in] Flush Flush the caches before setting the bit
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(mostly TRUE except MMIO addresses)
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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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MemEncryptSevSetPageEncMask (
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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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IN BOOLEAN Flush
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)
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{
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//
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// Memory encryption bit is not accessible in 32-bit mode
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//
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return RETURN_UNSUPPORTED;
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}
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/**
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Returns the encryption state of the specified virtual address range.
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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 Base address to check
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@param[in] Length Length of virtual address range
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@retval MemEncryptSevAddressRangeUnencrypted Address range is mapped
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unencrypted
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@retval MemEncryptSevAddressRangeEncrypted Address range is mapped
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encrypted
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@retval MemEncryptSevAddressRangeMixed Address range is mapped mixed
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@retval MemEncryptSevAddressRangeError Address range is not mapped
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**/
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MEM_ENCRYPT_SEV_ADDRESS_RANGE_STATE
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EFIAPI
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MemEncryptSevGetAddressRangeState (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS BaseAddress,
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IN UINTN Length
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)
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{
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//
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// Memory is always encrypted in 32-bit mode
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//
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return MemEncryptSevAddressRangeEncrypted;
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}
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/**
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This function clears memory encryption bit for the MMIO region specified by
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BaseAddress and NumPages.
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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 MMIO 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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MemEncryptSevClearMmioPageEncMask (
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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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//
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// Memory encryption bit is not accessible in 32-bit mode
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//
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return RETURN_UNSUPPORTED;
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}
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