MemoryProtectionConfigLib enables parsing the fw_cfg for the
memory protection profile.
Signed-off-by: Taylor Beebe <taylor.d.be...@gmail.com>
Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
Cc: Jiewen Yao <jiewen....@intel.com>
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Cc: Gerd Hoffmann <kra...@redhat.com>
---
OvmfPkg/Library/MemoryProtectionConfigLib/MemoryProtectionConfigLib.c | 118
++++++++++++++++++++
OvmfPkg/Include/Dsc/MemoryProtectionLibraries.dsc.inc | 1 +
OvmfPkg/Include/Library/MemoryProtectionConfigLib.h | 49
++++++++
OvmfPkg/Library/MemoryProtectionConfigLib/MemoryProtectionConfigLib.inf | 35
++++++
OvmfPkg/OvmfPkg.dec | 4 +
5 files changed, 207 insertions(+)
diff --git
a/OvmfPkg/Library/MemoryProtectionConfigLib/MemoryProtectionConfigLib.c
b/OvmfPkg/Library/MemoryProtectionConfigLib/MemoryProtectionConfigLib.c
new file mode 100644
index 000000000000..b568665f407c
--- /dev/null
+++ b/OvmfPkg/Library/MemoryProtectionConfigLib/MemoryProtectionConfigLib.c
@@ -0,0 +1,118 @@
+/** @file
+ Parses the fw_cfg file for the DXE and MM memory protection settings profile.
+
+ Copyright (c) Microsoft Corporation.
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Uefi.h>
+
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/QemuFwCfgSimpleParserLib.h>
+#include <Library/SetMemoryProtectionsLib.h>
+
+#define DXE_MEMORY_PROTECTION_PROFILE_FWCFG_FILE \
+ "opt/org.tianocore/DxeMemoryProtectionProfile"
+
+#define MM_MEMORY_PROTECTION_PROFILE_FWCFG_FILE \
+ "opt/org.tianocore/MmMemoryProtectionProfile"
+
+/**
+ Parses the fw_cfg file for the MM memory protection settings profile.
+
+ @param[in] MmSettings The MM memory protection settings profile to populate.
+
+ @retval EFI_SUCCESS The MM memory protection settings profile
was populated.
+ @retval EFI_INVALID_PARAMETER MmSettings is NULL.
+ @retval EFI_ABORTED The MM memory protection settings profile
name found in
+ fw_cfg was invalid.
+ @retval EFI_NOT_FOUND The MM memory protection settings profile
was not found.
+**/
+EFI_STATUS
+EFIAPI
+ParseFwCfgMmMemoryProtectionSettings (
+ IN MM_MEMORY_PROTECTION_SETTINGS *MmSettings
+ )
+{
+ CHAR8 String[100];
+ UINTN StringSize;
+ UINTN Index;
+
+ if (MmSettings == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ StringSize = sizeof (String);
+
+ if (!EFI_ERROR (QemuFwCfgParseString
(MM_MEMORY_PROTECTION_PROFILE_FWCFG_FILE, &StringSize, String))) {
+ Index = 0;
+ do {
+ if (AsciiStriCmp (MmMemoryProtectionProfiles[Index].Name, String) == 0) {
+ DEBUG ((DEBUG_INFO, "Setting MM Memory Protection Profile: %a\n",
String));
+ break;
+ }
+ } while (++Index < MmMemoryProtectionSettingsMax);
+
+ if (Index >= MmMemoryProtectionSettingsMax) {
+ DEBUG ((DEBUG_ERROR, "Invalid MM memory protection profile: %a\n",
String));
+ ASSERT (Index < MmMemoryProtectionSettingsMax);
+ return EFI_ABORTED;
+ } else {
+ CopyMem (MmSettings, &MmMemoryProtectionProfiles[Index].Settings, sizeof
(MM_MEMORY_PROTECTION_SETTINGS));
+ return EFI_SUCCESS;
+ }
+ }
+
+ return EFI_NOT_FOUND;
+}
+
+/**
+ Parses the fw_cfg file for the DXE memory protection settings profile.
+
+ @param[in] DxeSettings The DXE memory protection settings profile to
populate.
+
+ @retval EFI_SUCCESS The DXE memory protection settings profile
was populated.
+ @retval EFI_INVALID_PARAMETER DxeSettings is NULL.
+ @retval EFI_ABORTED The DXE memory protection settings profile
name found in
+ fw_cfg was invalid.
+ @retval EFI_NOT_FOUND The DXE memory protection settings profile
was not found.
+**/
+EFI_STATUS
+EFIAPI
+ParseFwCfgDxeMemoryProtectionSettings (
+ IN DXE_MEMORY_PROTECTION_SETTINGS *DxeSettings
+ )
+{
+ CHAR8 String[100];
+ UINTN StringSize;
+ UINTN Index;
+
+ if (DxeSettings == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ StringSize = sizeof (String);
+
+ if (!EFI_ERROR (QemuFwCfgParseString
(DXE_MEMORY_PROTECTION_PROFILE_FWCFG_FILE, &StringSize, String))) {
+ Index = 0;
+ do {
+ if (AsciiStriCmp (DxeMemoryProtectionProfiles[Index].Name, String) == 0)
{
+ DEBUG ((DEBUG_INFO, "Setting DXE Memory Protection Profile: %a\n",
String));
+ break;
+ }
+ } while (++Index < DxeMemoryProtectionSettingsMax);
+
+ if (Index >= DxeMemoryProtectionSettingsMax) {
+ DEBUG ((DEBUG_ERROR, "Invalid DXE memory protection profile: %a\n",
String));
+ ASSERT (Index < DxeMemoryProtectionSettingsMax);
+ return EFI_ABORTED;
+ } else {
+ CopyMem (DxeSettings, &DxeMemoryProtectionProfiles[Index].Settings,
sizeof (DXE_MEMORY_PROTECTION_SETTINGS));
+ return EFI_SUCCESS;
+ }
+ }
+
+ return EFI_NOT_FOUND;
+}
diff --git a/OvmfPkg/Include/Dsc/MemoryProtectionLibraries.dsc.inc
b/OvmfPkg/Include/Dsc/MemoryProtectionLibraries.dsc.inc
index 049fdef3f0c1..fcd8ef23c5a5 100644
--- a/OvmfPkg/Include/Dsc/MemoryProtectionLibraries.dsc.inc
+++ b/OvmfPkg/Include/Dsc/MemoryProtectionLibraries.dsc.inc
@@ -7,6 +7,7 @@
#
[LibraryClasses.common]
SetMemoryProtectionsLib|MdeModulePkg/Library/SetMemoryProtectionsLib/SetMemoryProtectionsLib.inf
+
MemoryProtectionConfigLib|OvmfPkg/Library/MemoryProtectionConfigLib/MemoryProtectionConfigLib.inf
[LibraryClasses.common.SMM_CORE, LibraryClasses.common.DXE_SMM_DRIVER,
LibraryClasses.common.MM_CORE_STANDALONE, LibraryClasses.common.MM_STANDALONE]
GetMemoryProtectionsLib|MdeModulePkg/Library/GetMemoryProtectionsLib/MmGetMemoryProtectionsLib.inf
diff --git a/OvmfPkg/Include/Library/MemoryProtectionConfigLib.h
b/OvmfPkg/Include/Library/MemoryProtectionConfigLib.h
new file mode 100644
index 000000000000..d30de58001c3
--- /dev/null
+++ b/OvmfPkg/Include/Library/MemoryProtectionConfigLib.h
@@ -0,0 +1,49 @@
+/** @file
+ Parses the fw_cfg file for the DXE and MM memory protection settings profile.
+
+ Copyright (c) Microsoft Corporation.
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef MEMORY_PROTECTION_CONFIG_LIB_H_
+#define MEMORY_PROTECTION_CONFIG_LIB_H_
+
+#include <Uefi.h>
+
+#include <Library/SetMemoryProtectionsLib.h>
+
+/**
+ Parses the fw_cfg file for the MM memory protection settings profile.
+
+ @param[in] MmSettings The MM memory protection settings profile to populate.
+
+ @retval EFI_SUCCESS The MM memory protection settings profile
was populated.
+ @retval EFI_INVALID_PARAMETER MmSettings is NULL.
+ @retval EFI_ABORTED The MM memory protection settings profile
name found in
+ fw_cfg was invalid.
+ @retval EFI_NOT_FOUND The MM memory protection settings profile
was not found.
+**/
+EFI_STATUS
+EFIAPI
+ParseFwCfgMmMemoryProtectionSettings (
+ IN MM_MEMORY_PROTECTION_SETTINGS *MmSettings
+ );
+
+/**
+ Parses the fw_cfg file for the DXE memory protection settings profile.
+
+ @param[in] DxeSettings The DXE memory protection settings profile to
populate.
+
+ @retval EFI_SUCCESS The DXE memory protection settings profile
was populated.
+ @retval EFI_INVALID_PARAMETER DxeSettings is NULL.
+ @retval EFI_ABORTED The DXE memory protection settings profile
name found in
+ fw_cfg was invalid.
+ @retval EFI_NOT_FOUND The DXE memory protection settings profile
was not found.
+**/
+EFI_STATUS
+EFIAPI
+ParseFwCfgDxeMemoryProtectionSettings (
+ IN DXE_MEMORY_PROTECTION_SETTINGS *DxeSettings
+ );
+
+#endif
diff --git
a/OvmfPkg/Library/MemoryProtectionConfigLib/MemoryProtectionConfigLib.inf
b/OvmfPkg/Library/MemoryProtectionConfigLib/MemoryProtectionConfigLib.inf
new file mode 100644
index 000000000000..0ff431752901
--- /dev/null
+++ b/OvmfPkg/Library/MemoryProtectionConfigLib/MemoryProtectionConfigLib.inf
@@ -0,0 +1,35 @@
+## @file
+# Parses the fw_cfg file for the DXE and MM memory protection settings profile.
+#
+# Copyright (c) Microsoft Corporation.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = MemoryProtectionConfigLib
+ FILE_GUID = 865BFF85-CC3A-43E7-82E1-36E1894BC8EF
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = MemoryProtectionConfigLib|SEC PEI_CORE PEIM
+
+#
+# The following information is for reference only and not required by the build
+# tools.
+#
+# VALID_ARCHITECTURES = IA32 X64 ARM AARCH64
+#
+
+[Sources]
+ MemoryProtectionConfigLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ MdeModulePkg/MdeModulePkg.dec
+ OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ BaseMemoryLib
+ DebugLib
+ QemuFwCfgSimpleParserLib
diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index e3861e5c1b39..126be04ca302 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -42,6 +42,10 @@ [LibraryClasses]
#
MemEncryptTdxLib|Include/Library/MemEncryptTdxLib.h
+ ## @libraryclass Declares helper functions for parsing fw_cfg for
+ # the memory protection profile strings
+ MemoryProtectionConfigLib|Include/Library/MemoryProtectionConfigLib.h
+
## @libraryclass Handle TPL changes within nested interrupt handlers
#
NestedInterruptTplLib|Include/Library/NestedInterruptTplLib.h
--
2.42.0.windows.2
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