adfa3327d4
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275 The Flush parameter is used to provide a hint whether the specified range is Mmio address. Now that we have a dedicated helper to clear the memory encryption mask for the Mmio address range, its safe to remove the Flush parameter from MemEncryptSev{Set,Clear}PageEncMask(). Since the address specified in the MemEncryptSev{Set,Clear}PageEncMask() points to a system RAM, thus a cache flush is required during the encryption mask update. 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: <20210519181949.6574-14-brijesh.singh@amd.com>
127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/** @file
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Virtual Memory Management Services to set or clear the memory encryption bit
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Copyright (c) 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/CpuLib.h>
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#include <Library/MemEncryptSevLib.h>
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#include "VirtualMemory.h"
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/**
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Return the pagetable memory encryption mask.
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@return The pagetable memory encryption mask.
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**/
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UINT64
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EFIAPI
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InternalGetMemEncryptionAddressMask (
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VOID
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)
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{
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UINT64 EncryptionMask;
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EncryptionMask = MemEncryptSevGetEncryptionMask ();
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EncryptionMask &= PAGING_1G_ADDRESS_MASK_64;
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return EncryptionMask;
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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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PhysicalAddress and Length 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] PhysicalAddress The physical address that is the start
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address of a memory region.
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@param[in] Length The length of memory 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 encyrption 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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InternalMemEncryptSevSetMemoryDecrypted (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS PhysicalAddress,
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IN UINTN Length
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)
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{
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//
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// This function is not available during SEC.
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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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PhysicalAddress and Length 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] PhysicalAddress The physical address that is the start
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address of a memory region.
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@param[in] Length The length of memory region
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@param[in] Flush Flush the caches before applying the
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encryption mask
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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 encyrption 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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InternalMemEncryptSevSetMemoryEncrypted (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS PhysicalAddress,
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IN UINTN Length
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)
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{
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//
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// This function is not available during SEC.
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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 clears memory encryption bit for the MMIO region specified by
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PhysicalAddress and Length.
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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] PhysicalAddress The physical address that is the start
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address of a MMIO region.
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@param[in] Length The length of memory 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 Length is zero.
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@retval RETURN_UNSUPPORTED Clearing the memory encyrption 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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InternalMemEncryptSevClearMmioPageEncMask (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS PhysicalAddress,
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IN UINTN Length
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)
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{
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//
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// This function is not available during SEC.
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//
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return RETURN_UNSUPPORTED;
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}
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