Thanks Kun,
For putting the new library in MdePkg, I am not sure whether this is a similar case to SmmMemLib.
I looped Jiewen, Liming and Mike to check if they have comments on this.
Best Regards,
Hao Wu
From: Kun Qin <kun.q@outlook.com>
Sent: Wednesday, February 24, 2021 3:30 AM
To: devel@edk2.groups.io; Wu, Hao A <hao.a.wu@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>; gaoliming <gaoliming@byosoft.com.cn>; Kinney, Michael D <michael.d.kinney@intel.com>; Liu, Zhiguang <zhiguang.liu@intel.com>
Cc: Wang, Jian J <jian.j.wang@intel.com>; Dong, Eric <eric.dong@intel.com>; Ni, Ray <ray.ni@intel.com>
Subject: RE: [edk2-devel] [PATCH v2 1/6] MdeModulePkg: DxeMmUnblockMemoryLib: Added definition and null instance
Hi Hao,
Thanks for the suggestion. I can move the library to MdePkg similar to SmmMemLib and add the change for OVMF.
Liming/Zhiguang,
I am happy to prepare patches to cover the dependency change in ed2-platform in a separate patch series. But please let me know if you would like to proceed otherwise.
Thanks,
Kun
From: Wu, Hao A
Sent: Monday, February 22, 2021 17:42
To: Kun Qin;
devel@edk2.groups.io; Yao, Jiewen;
gaoliming; Kinney, Michael D;
Liu, Zhiguang
Cc: Wang, Jian J;
Dong, Eric; Ni, Ray
Subject: Re: [edk2-devel] [PATCH v2 1/6] MdeModulePkg: DxeMmUnblockMemoryLib: Added definition and null instance
Hello Kun,
Sorry for the delayed response.
Except for missing the UNI file for the newly added library, I do not have other comment for the implementation at this moment.
But I am wondering if this library can be added into the MdePkg as the case for MdePkg\Library\SmmMemLib\
I have looped in Jiewen, Liming and Mike for comments.
Also, since:
* New library dependency for VariableSmmRuntimeDxe.inf
* INF file separation and new library dependency in Tcg2Smm
I think the series needs to prepare the changes for platforms under edk2 (OVMF) and edk2-platforms repositories that consume the above 2 modules.
I am not exactly sure on how this should be handled within edk2-platforms, so I added Liming and Zhiguang here for comments.
Best Regards,
Hao Wu
From: Kun Qin <kun.q@outlook.com>
Sent: Tuesday, February 23, 2021 6:15 AM
To: devel@edk2.groups.io; Wu, Hao A <hao.a.wu@intel.com>
Cc: Wang, Jian J <jian.j.wang@intel.com>; Dong, Eric <eric.dong@intel.com>; Ni, Ray <ray.ni@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>
Subject: RE: [PATCH v2 1/6] MdeModulePkg: DxeMmUnblockMemoryLib: Added definition and null instance
Hi Hao,
The patch series was resent with intended usage in VariableRuntime and Tcg2 drivers. Could you please provide feedback on them? Any input is appreciated.
Regards,
Kun
From: Kun Qin
Sent: Tuesday, February 9, 2021 17:25
To: devel@edk2.groups.io
Cc: Jian J Wang;
Hao A Wu; Eric Dong;
Ray Ni; Jiewen Yao
Subject: [PATCH v2 1/6] MdeModulePkg: DxeMmUnblockMemoryLib: Added definition and null instance
REF:
https://bugzilla.tianocore.org/show_bug.cgi?id=3168
This interface definition provides an abstraction layer for DXE drivers
to request certain memory blocks to be mapped/unblocked for accessibility
inside MM environment.
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Kun Qin <kun.q@outlook.com>
---
Notes:
v2:
- Resend with practical usage. No change [Hao]
MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull.c | 40 ++++++++++++++++++++
MdeModulePkg/Include/Library/DxeMmUnblockMemoryLib.h | 40 ++++++++++++++++++++
MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull.inf | 29 ++++++++++++++
MdeModulePkg/MdeModulePkg.dec | 5 +++
MdeModulePkg/MdeModulePkg.dsc | 2 +
5 files changed, 116 insertions(+)
diff --git a/MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull.c b/MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull.c
new file mode 100644
index 000000000000..774a7e41cfb0
--- /dev/null
+++ b/MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull.c
@@ -0,0 +1,40 @@
+/** @file
+ Null instance of MM Unblock Page Library.
+
+ This library provides an abstraction layer of requesting certain page access to be unblocked
+ by MM environment if applicable.
+
+ Copyright (c), Microsoft Corporation.
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Uefi.h>
+
+/**
+ This API provides a way to unblock certain data pages to be accessible inside MM environment.
+
+ @param UnblockAddress The address of buffer caller requests to unblock, the address
+ has to be page aligned.
+ @param NumberOfPages The number of pages requested to be unblocked from MM
+ environment.
+
+ @return EFI_SUCCESS The request goes through successfully.
+ @return EFI_NOT_AVAILABLE_YET The requested functionality is not produced yet.
+ @return EFI_UNSUPPORTED The requested functionality is not supported on current platform.
+ @return EFI_SECURITY_VIOLATION The requested address failed to pass security check for
+ unblocking.
+ @return EFI_INVALID_PARAMETER Input address either NULL pointer or not page aligned.
+ @return EFI_ACCESS_DENIED The request is rejected due to system has passed certain boot
+ phase.
+
+**/
+EFI_STATUS
+EFIAPI
+DxeMmUnblockMemoryRequest (
+ IN EFI_PHYSICAL_ADDRESS UnblockAddress,
+ IN UINT64 NumberOfPages
+ )
+{
+ return EFI_UNSUPPORTED;
+}
diff --git a/MdeModulePkg/Include/Library/DxeMmUnblockMemoryLib.h b/MdeModulePkg/Include/Library/DxeMmUnblockMemoryLib.h
new file mode 100644
index 000000000000..8b63eb74a078
--- /dev/null
+++ b/MdeModulePkg/Include/Library/DxeMmUnblockMemoryLib.h
@@ -0,0 +1,40 @@
+/** @file
+ MM Unblock Memory Library Interface.
+
+ This library provides an abstraction layer of requesting certain page access to be unblocked
+ by MM environment if applicable.
+
+ Copyright (c), Microsoft Corporation.
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _DXE_MM_UNBLOCK_MEMORY_LIB_H_
+#define _DXE_MM_UNBLOCK_MEMORY_LIB_H_
+
+/**
+ This API provides a way to unblock certain data pages to be accessible inside MM environment.
+
+ @param UnblockAddress The address of buffer caller requests to unblock, the address
+ has to be page aligned.
+ @param NumberOfPages The number of pages requested to be unblocked from MM
+ environment.
+
+ @return EFI_SUCCESS The request goes through successfully.
+ @return EFI_NOT_AVAILABLE_YET The requested functionality is not produced yet.
+ @return EFI_UNSUPPORTED The requested functionality is not supported on current platform.
+ @return EFI_SECURITY_VIOLATION The requested address failed to pass security check for
+ unblocking.
+ @return EFI_INVALID_PARAMETER Input address either NULL pointer or not page aligned.
+ @return EFI_ACCESS_DENIED The request is rejected due to system has passed certain boot
+ phase.
+
+**/
+EFI_STATUS
+EFIAPI
+DxeMmUnblockMemoryRequest (
+ IN EFI_PHYSICAL_ADDRESS UnblockAddress,
+ IN UINT64 NumberOfPages
+);
+
+#endif // _DXE_MM_UNBLOCK_MEMORY_LIB_H_
diff --git a/MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull.inf b/MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull.inf
new file mode 100644
index 000000000000..e40462e5ab81
--- /dev/null
+++ b/MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull.inf
@@ -0,0 +1,29 @@
+## @file
+# Null instance of MM Unblock Page Library.
+#
+# This library provides an abstraction layer of requesting certain page access to be unblocked
+# by MM environment if applicable.
+#
+# Copyright (c), Microsoft Corporation.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+ INF_VERSION = 0x0001001B
+ BASE_NAME = DxeMmUnblockMemoryLibNull
+ FILE_GUID = 9E890F68-5C95-4C31-95DD-59E6286F85EA
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = DxeMmUnblockMemoryLib
+
+#
+# VALID_ARCHITECTURES = IA32 X64
+#
+
+[Sources]
+ DxeMmUnblockMemoryLibNull.c
+
+[Packages]
+ MdePkg/MdePkg.dec
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 148395511034..1bb5017da2c5 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -154,6 +154,11 @@ [LibraryClasses]
#
VariablePolicyHelperLib|Include/Library/VariablePolicyHelperLib.h
+ ## @libraryclass This library provides an interface for DXE drivers to request MM environment
+ # to map/unblock a memory region for accessibility inside MM.
+ #
+ DxeMmUnblockMemoryLib|Include/Library/DxeMmUnblockMemoryLib.h
+
[Guids]
## MdeModule package token space guid
# Include/Guid/MdeModulePkgTokenSpace.h
diff --git a/MdeModulePkg/MdeModulePkg.dsc b/MdeModulePkg/MdeModulePkg.dsc
index 7ca4a1bb3080..2bc6b8730b8b 100644
--- a/MdeModulePkg/MdeModulePkg.dsc
+++ b/MdeModulePkg/MdeModulePkg.dsc
@@ -100,6 +100,7 @@ [LibraryClasses]
SafeIntLib|MdePkg/Library/BaseSafeIntLib/BaseSafeIntLib.inf
DisplayUpdateProgressLib|MdeModulePkg/Library/DisplayUpdateProgressLibGraphics/DisplayUpdateProgressLibGraphics.inf
VariablePolicyHelperLib|MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.inf
+ DxeMmUnblockMemoryLib|MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull.inf
[LibraryClasses.EBC.PEIM]
IoLib|MdePkg/Library/PeiIoLibCpuIo/PeiIoLibCpuIo.inf
@@ -332,6 +333,7 @@ [Components]
MdeModulePkg/Library/BaseBmpSupportLib/BaseBmpSupportLib.inf
MdeModulePkg/Library/DisplayUpdateProgressLibGraphics/DisplayUpdateProgressLibGraphics.inf
MdeModulePkg/Library/DisplayUpdateProgressLibText/DisplayUpdateProgressLibText.inf
+ MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull.inf
MdeModulePkg/Universal/BdsDxe/BdsDxe.inf
MdeModulePkg/Application/BootManagerMenuApp/BootManagerMenuApp.inf
--
2.30.0.windows.1