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MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe: Add support for PCD PcdPteMemoryEncryptionAddressOrMask

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This PCD holds the address mask for page table entries when memory
encryption is enabled on AMD processors supporting the Secure Encrypted
Virtualization (SEV) feature.

This module updates the under-4GB page tables configured by the S3-Resume
code in UefiCpuPkg/Universal/Acpi/S3Resume2Pei. The mask is saved at module
start (ScriptExecute.c), and applied when tables are expanded on-demand by
page-faults above 4GB's (SetIdtEntry.c).

CC: Jeff Fan <jeff.fan@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Leo Duran <leo.duran@amd.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Leo Duran
2017-02-27 01:43:06 +08:00
committed by Star Zeng
parent 787a085b0f
commit ab1a5a58c9
4 changed files with 23 additions and 6 deletions
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7
MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.c
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@@ -5,6 +5,7 @@
in the entry point. The functionality is to interpret and restore the S3 boot script
Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@@ -23,6 +24,7 @@ EFI_GUID mBootScriptExecutorImageGuid = {
};
BOOLEAN mPage1GSupport = FALSE;
UINT64 mAddressEncMask = 0;
/**
Entry function of Boot script exector. This function will be executed in
@@ -407,6 +409,11 @@ BootScriptExecutorEntryPoint (
return EFI_UNSUPPORTED;
}
//
// Make sure AddressEncMask is contained to smallest supported address field.
//
mAddressEncMask = PcdGet64 (PcdPteMemoryEncryptionAddressOrMask) & PAGING_1G_ADDRESS_MASK_64;
//
// Test if the gEfiCallerIdGuid of this image is already installed. if not, the entry
// point is loaded by DXE code which is the first time loaded. or else, it is already