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Hi Liming,

 

Thanks for confirmation. Here is a preview implemen= tation we have:

Introduce Standlone MM inst= ance of MM unblock memory =A1=A4 kuqin12/mu_basecore@16dfdc3 (github.com)

 

But please know that the real implementation will n= eed to pair with the standalone mm solution that blocks all memory access. = We would be happy to share it along with the real library implementation wh= en all pieces are ready.

 

Thanks,

Kun

 

From: gaoliming
Sent: Thursday, February 25, 2021 06:04
To: devel@edk2.groups.io; kun.q@outlook.com; jiewen.yao@= intel.com; 'Wu, Hao A'; 'Kinney, Michael D'; 'Liu, Z= higuang'
Cc: 'Wang, Jian J'; 'Dong, Eric'; 'Ni, Ray'
Subject: =BB=D8= = =B8=B4: [edk2-devel] [PATCH v2 1/6] MdeModulePkg: DxeMmUnblockMemor= yLib: Added definition and null instance

 

Kun:

 I agree to add new library class MmUnblockMemoryLib and its NULL implementation into MdePkg. I want = to confirm where is the real implementation for MmUnblockMemoryLib.

 

Thanks

Liming

=B7=A2=BC=FE=C8=CB:<= /span> devel@edk2.groups.io <de= vel@edk2.groups.io> =B4=FA=B1=ED Kun Qin
=B7=A2=CB=CD=CA=B1=BC=E4: 2021=C4=EA2=D4=C224=C8=D5 9:49
=CA=D5=BC=FE=C8=CB: devel@edk2.groups.i= o; jiewen.yao@intel.com; Wu, Hao A <hao.a.wu@intel.com>; gaoliming &l= t;gaoliming@byosoft.com.cn>; Kinney, Michael D <michael.d.kinney@inte= l.com>; Liu, Zhiguang <zhiguang.liu@intel.com>
=B3=AD=CB=CD: Wang, Jian J <jian.j.w= ang@intel.com>; Dong, Eric <eric.dong@intel.com>; Ni, Ray <ray.= ni@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>
=D6=F7=CC=E2: Re: [edk2-devel] [PATCH v= 2 1/6] MdeModulePkg: DxeMmUnblockMemoryLib: Added definition and null insta= nce

 

Hi Jiewen,

 

I agree with your  assessment that it could ha= ve a PEI and potentially MM instance. Will remove the prefix and change the= m to `MmUnblockMemoryLib` in v3 patches. Thanks for the input.

 

Regards,

Kun

 

From: Yao, Jiewen
Sent: Tuesday, February 23, 2021 17:33
To: Wu, Hao A; Kun Qin; devel@edk2.groups.io<= /a>; gaoliming; Kinney, Micha= el D; Liu, Zhiguang
Cc: Wang, Jian J; Dong, Eric; Ni, Ray; Yao, Jiewen
Subject: Re: [edk2-devel] [PATCH v2 1/6] MdeModulePkg: DxeMmUnblock= MemoryLib: Added definition and null instance

 

I feel the name is confusing.

 

The class name is DxeMmUnblockMemoryLib. But actual= ly, this is not related to DXE phase.

 

I believe, it is also applicable to PEI phase, if w= e have a PEI instance. Please correct me if I am wrong.

Also, we can have SMM instance, right?

 

If that is true, then I prefer to remove Dxe prefix= .

 

From: Wu, Hao A <hao.a.wu@intel.com>
Sent: Wednesday, February 24, 2021 9:27 AM
To: Kun Qin <kun.q@outlook.= com>; devel@edk2.groups.io; Yao, Jiewen <jiewen.yao@intel.com>; gaoliming <gaoliming@byosoft.com.cn>; Kinney, Michael D &l= t;michael.d.kinney@intel.com<= /a>>; 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: DxeMmUnblock= MemoryLib: Added definition and null instance

 

Thanks Kun,

 

For putting the new library in MdePkg, I am not sur= e whether this is a similar case to SmmMemLib.

I looped Jiewen, Liming and Mike to check if they h= ave 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 <micha= el.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: DxeMmUnblock= MemoryLib: Added definition and null instance

 

Hi Hao,

 

Thanks for the suggestion. I can move the library t= o MdePkg similar to SmmMemLib and add the change for OVMF.

 

Liming/Zhiguang,

 

I am happy to prepare patches to cover the dependen= cy change in ed2-platform in a separate patch series. But please let me kno= w 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, Jie= wen; gaoliming; Kinney, Micha= el D; Liu, Zhiguang
Cc: Wang, Jian J; Dong, Eric; Ni, Ray
Subject: Re: [edk2-devel] [PATCH v2 1/6] MdeModulePkg: DxeMmUnblock= MemoryLib: 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 int= o the MdePkg as the case for MdePkg\Library\SmmMemLib\

I have looped in Jiewen, Liming and Mike for commen= ts.

 

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 t= he 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: Ad= ded 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: K= un 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=3D3168

This interface definition provides an abstraction layer for DXE drivers to request certain memory blocks to be mapped/unblocked for accessibility<= br> inside MM environment.

Cc: Jian J Wang <jian.j.wang@i= ntel.com>
Cc: Hao A Wu <hao.a.wu@intel.com<= /a>>
Cc: Eric Dong <eric.dong@intel.c= om>
Cc: Ray Ni <ray.ni@intel.com>= ;
Cc: Jiewen Yao <jiewen.yao@inte= l.com>

Signed-off-by: Kun Qin <kun.q@outl= ook.com>
---

Notes:
    v2:
    - Resend with practical usage. No change [Hao]

 MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull= .c   | 40 ++++++++++++++++++++
 MdeModulePkg/Include/Library/DxeMmUnblockMemoryLib.h  &nbs= p;            &= nbsp;     | 40 ++++++++++++++++++++
 MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNull= .inf | 29 ++++++++++++++
 MdeModulePkg/MdeModulePkg.dec      &nb= sp;            =             &nb= sp;            |&nbs= p; 5 +++
 MdeModulePkg/MdeModulePkg.dsc      &nb= sp;            =             &nb= sp;            |&nbs= p; 2 +
 5 files changed, 116 insertions(+)

diff --git a/MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemory= LibNull.c b/MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLi= bNull.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 p= age 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 access= ible inside MM environment.
+
+  @param  UnblockAddress      &nb= sp;   The address of buffer caller requests to unblock, the addre= ss
+            &= nbsp;           &nbs= p;         has to be page aligned.<= br> +  @param  NumberOfPages      &nbs= p;    The number of pages requested to be unblocked from MM<= br> +            &= nbsp;           &nbs= p;         environment.
+
+  @return EFI_SUCCESS        = ;     The request goes through successfully.
+  @return EFI_NOT_AVAILABLE_YET   The requested functional= ity is not produced yet.
+  @return EFI_UNSUPPORTED       &= nbsp; The requested functionality is not supported on current platform.
+  @return EFI_SECURITY_VIOLATION  The requested address failed = to pass security check for
+            &= nbsp;           &nbs= p;         unblocking.
+  @return EFI_INVALID_PARAMETER   Input address either NUL= L pointer or not page aligned.
+  @return EFI_ACCESS_DENIED       The = request is rejected due to system has passed certain boot
+            &= nbsp;           &nbs= p;         phase.
+
+**/
+EFI_STATUS
+EFIAPI
+DxeMmUnblockMemoryRequest (
+  IN EFI_PHYSICAL_ADDRESS   UnblockAddress,
+  IN UINT64         &nb= sp;       NumberOfPages
+  )
+{
+  return EFI_UNSUPPORTED;
+}
diff --git a/MdeModulePkg/Include/Library/DxeMmUnblockMemoryLib.h b/MdeMod= ulePkg/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 p= age 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 access= ible inside MM environment.
+
+  @param  UnblockAddress      &nb= sp;   The address of buffer caller requests to unblock, the addre= ss
+            &= nbsp;           &nbs= p;         has to be page aligned.<= br> +  @param  NumberOfPages      &nbs= p;    The number of pages requested to be unblocked from MM<= br> +            &= nbsp;           &nbs= p;         environment.
+
+  @return EFI_SUCCESS        = ;     The request goes through successfully.
+  @return EFI_NOT_AVAILABLE_YET   The requested functional= ity is not produced yet.
+  @return EFI_UNSUPPORTED       &= nbsp; The requested functionality is not supported on current platform.
+  @return EFI_SECURITY_VIOLATION  The requested address failed = to pass security check for
+            &= nbsp;           &nbs= p;         unblocking.
+  @return EFI_INVALID_PARAMETER   Input address either NUL= L pointer or not page aligned.
+  @return EFI_ACCESS_DENIED       The = request is rejected due to system has passed certain boot
+            &= nbsp;           &nbs= p;         phase.
+
+**/
+EFI_STATUS
+EFIAPI
+DxeMmUnblockMemoryRequest (
+  IN EFI_PHYSICAL_ADDRESS   UnblockAddress,
+  IN UINT64         &nb= sp;       NumberOfPages
+);
+
+#endif // _DXE_MM_UNBLOCK_MEMORY_LIB_H_
diff --git a/MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemory= LibNull.inf b/MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemory= LibNull.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         &= nbsp;          =3D 0x0001001B<= br> +  BASE_NAME         &nb= sp;            =3D D= xeMmUnblockMemoryLibNull
+  FILE_GUID         &nb= sp;            =3D 9= E890F68-5C95-4C31-95DD-59E6286F85EA
+  MODULE_TYPE         &= nbsp;          =3D BASE
+  VERSION_STRING        &nbs= p;        =3D 1.0
+  LIBRARY_CLASS         = ;         =3D DxeMmUnblockMemoryLib=
+
+#
+#  VALID_ARCHITECTURES       &nbs= p;   =3D 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/VariablePolicyHelperL= ib.h
 
+  ##  @libraryclass  This library provides an interface fo= r DXE drivers to request MM environment
+  #   to map/unblock a memory region for accessibility ins= ide 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/DisplayUpdatePr= ogressLibGraphics/DisplayUpdateProgressLibGraphics.inf
   VariablePolicyHelperLib|MdeModulePkg/Library/VariablePolicyHe= lperLib/VariablePolicyHelperLib.inf
+  DxeMmUnblockMemoryLib|MdeModulePkg/Library/DxeMmUnblockMemoryLib/D= xeMmUnblockMemoryLibNull.inf
 
 [LibraryClasses.EBC.PEIM]
   IoLib|MdePkg/Library/PeiIoLibCpuIo/PeiIoLibCpuIo.inf
@@ -332,6 +333,7 @@ [Components]
   MdeModulePkg/Library/BaseBmpSupportLib/BaseBmpSupportLib.inf<= br>    MdeModulePkg/Library/DisplayUpdateProgressLibGraphics/Display= UpdateProgressLibGraphics.inf
   MdeModulePkg/Library/DisplayUpdateProgressLibText/DisplayUpda= teProgressLibText.inf
+  MdeModulePkg/Library/DxeMmUnblockMemoryLib/DxeMmUnblockMemoryLibNu= ll.inf
 
   MdeModulePkg/Universal/BdsDxe/BdsDxe.inf
   MdeModulePkg/Application/BootManagerMenuApp/BootManagerMenuAp= p.inf
--
2.30.0.windows.1

 

 

 

 

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