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Thanks, Liming. I will send the updated patches sho= rtly.

 

Regards,

Kun

 

From: gaoliming
Sent: Thursday, March 4, 2021 19:15
To: devel@edk2.groups.io; kun.q@outlook.com; 'Mich= ael D Kinney'; 'Zhiguang Liu'
Cc: 'Hao A Wu'; 'Jiewen Yao'; 'Laszlo Ersek'<= br> Subject: =BB=D8= = =B8=B4: [edk2-devel] [PATCH v5 1/7] MdePkg: MmUnblockMemoryLib: Add= ed definition and null instance

 

Kun:

 I have one minor comment. Please see it.

 

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=EA3=D4=C25=C8=D5 8:23
=CA=D5=BC=FE=C8=CB: devel@edk2.groups.i= o; Michael D Kinney <michael.d.kinney@intel.com>; gaoliming <gaoli= ming@byosoft.com.cn>; Zhiguang Liu <zhiguang.liu@intel.com>
=B3=AD=CB=CD: Hao A Wu <hao.a.wu@int= el.com>; Jiewen Yao <jiewen.yao@intel.com>; Laszlo Ersek <lerse= k@redhat.com>
=D6=F7=CC=E2: Re: [edk2-devel] [PATCH v= 5 1/7] MdePkg: MmUnblockMemoryLib: Added definition and null instance<= /o:p>

 

Hi Mike/Liming/Zhiguang,

 

Could you please review this patch and let me know = if you have any feedback on this patch? Any input is appreciated.

 

Regards,

Kun

 

From: K= un Qin
Sent: Thursday, March 4, 2021 10:58
To: devel@edk2.groups.io
Cc: Michael D Kinney<= /a>; Liming Gao; Zhiguang Liu= ; Hao A Wu; Jiewen Yao; Laszlo Ersek
Subject: [PATCH v5 1/7] MdePkg: MmUnblockMemoryLib: Added definitio= n and null instance

 

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3D3168

This interface provides an abstration layer to allow MM modules to access<= br> requested areas that are outside of MMRAM. On MM model that blocks all
non-MMRAM accesses, areas requested through this API will be mapped or
unblocked for accessibility inside MM environment.

For MM modules that need to access regions outside of MMRAMs, the agents that set up these regions are responsible for invoking this API in order for these memory areas to be accessible from inside MM.

Example usages:
1. To enable runtime cache feature for variable service, Variable MM
module will need to access the allocated runtime buffer. Thus the agent sets up these buffers, VariableSmmRuntimeDxe, will need to invoke this
API to make these regions accessible by Variable MM.
2. For TPM ACPI table to communicate to physical presence handler, the
corresponding NVS region has to be accessible from inside MM. Once the
NVS region are assigned, it needs to be unblocked thourgh this API.

Cc: Michael D Kinney <mic= hael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@b= yosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.li= u@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com<= /a>>
Cc: Jiewen Yao <jiewen.yao@inte= l.com>
Cc: Laszlo Ersek <lersek@redhat.co= m>

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

Notes:
    v5:
    - Downgraded data types from EFI_* to RETURN_*. [Laszlo= ]
   
    v4:
    - Added more commit message [Laszlo]
    - Added UNI file [Hao]
   
    v3:
    - Move interface to MdePkg [Hao, Liming, Jiewen]
    - Remove Dxe prefix [Jiewen]
   
    v2:
    - Resend with practical usage. No change [Hao]

 MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.c &nbs= p; | 44 ++++++++++++++++++++
 MdePkg/Include/Library/MmUnblockMemoryLib.h    &= nbsp;           &nbs= p; | 44 ++++++++++++++++++++
 MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf | 34 ++= +++++++++++++
 MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.uni | 21 ++= ++++++++
 MdePkg/MdePkg.dec        &nb= sp;            =             &nb= sp;          |  5 +++
 MdePkg/MdePkg.dsc        &nb= sp;            =             &nb= sp;          |  1 +
 6 files changed, 149 insertions(+)

diff --git a/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.c b/= MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.c
new file mode 100644
index 000000000000..b205c9122df8
--- /dev/null
+++ b/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.c
@@ -0,0 +1,44 @@
+/** @file
+  Null instance of MM Unblock Page Library.
+
+  This library provides an interface to request non-MMRAM pages to b= e mapped/unblocked
+  from inside MM environment.
+
+  For MM modules that need to access regions outside of MMRAMs, the = agents that set up
+  these regions are responsible for invoking this API in order for t= hese memory areas
+  to be accessed from inside MM.
+
+  Copyright (c) Microsoft Corporation.
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.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 reques= ts to unblock, the address
+            &= nbsp;           &nbs= p;             = has to be page aligned.
+  @param  NumberOfPages      &nbs= p;        The number of pages requested = to be unblocked from MM
+            &= nbsp;           &nbs= p;             = environment.
+
+  @retval RETURN_SUCCESS       &n= bsp;      The request goes through successfully. +  @retval RETURN_NOT_AVAILABLE_YET    The requested f= unctionality is not produced yet.
+  @retval RETURN_UNSUPPORTED      &nbs= p;   The requested functionality is not supported on current plat= form.
+  @retval RETURN_SECURITY_VIOLATION   The requested addres= s failed to pass security check for
+            &= nbsp;           &nbs= p;             = unblocking.
+  @retval RETURN_INVALID_PARAMETER    Input address e= ither NULL pointer or not page aligned.
+  @retval RETURN_ACCESS_DENIED      &n= bsp; The request is rejected due to system has passed certain boot
+            &= nbsp;           &nbs= p;             = phase.
+
+**/
+RETURN_STATUS
+EFIAPI
+MmUnblockMemoryRequest (
+  IN PHYSICAL_ADDRESS       UnblockAdd= ress,
+  IN UINT64         &nb= sp;       NumberOfPages
+  )
+{
+  return RETURN_UNSUPPORTED;
+}
diff --git a/MdePkg/Include/Library/MmUnblockMemoryLib.h b/MdePkg/Include/= Library/MmUnblockMemoryLib.h
new file mode 100644
index 000000000000..00fab530a3bc
--- /dev/null
+++ b/MdePkg/Include/Library/MmUnblockMemoryLib.h
@@ -0,0 +1,44 @@
+/** @file
+  MM Unblock Memory Library Interface.
+
+  This library provides an interface to request non-MMRAM pages to b= e mapped/unblocked
+  from inside MM environment.
+
+  For MM modules that need to access regions outside of MMRAMs, the = agents that set up
+  these regions are responsible for invoking this API in order for t= hese memory areas
+  to be accessed from inside MM.
+
+  Copyright (c) Microsoft Corporation.
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef MM_UNBLOCK_MEMORY_LIB_H_
+#define 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 reques= ts to unblock, the address
+            &= nbsp;           &nbs= p;             = has to be page aligned.
+  @param  NumberOfPages      &nbs= p;        The number of pages requested = to be unblocked from MM
+            &= nbsp;           &nbs= p;             = environment.
+
+  @retval RETURN_SUCCESS       &n= bsp;      The request goes through successfully. +  @retval RETURN_NOT_AVAILABLE_YET    The requested f= unctionality is not produced yet.
+  @retval RETURN_UNSUPPORTED      &nbs= p;   The requested functionality is not supported on current plat= form.
+  @retval RETURN_SECURITY_VIOLATION   The requested addres= s failed to pass security check for
+            &= nbsp;           &nbs= p;             = unblocking.
+  @retval RETURN_INVALID_PARAMETER    Input address e= ither NULL pointer or not page aligned.
+  @retval RETURN_ACCESS_DENIED      &n= bsp; The request is rejected due to system has passed certain boot
+            &= nbsp;           &nbs= p;             = phase.
+
+**/
+RETURN_STATUS
+EFIAPI
+MmUnblockMemoryRequest (
+  IN PHYSICAL_ADDRESS       UnblockAdd= ress,
+  IN UINT64         &nb= sp;       NumberOfPages
+);
+
+#endif // MM_UNBLOCK_MEMORY_LIB_H_
diff --git a/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf = b/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf
new file mode 100644
index 000000000000..8ecb767ff7bd
--- /dev/null
+++ b/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf
@@ -0,0 +1,34 @@
+## @file
+#  Null instance of MM Unblock Page Library.
+#
+#  This library provides an interface to request non-MMRAM pages to = be mapped/unblocked
+#  from inside MM environment.
+#
+#  For MM modules that need to access regions outside of MMRAMs, the= agents that set up
+#  these regions are responsible for invoking this API in order for = these memory areas
+#  to be accessed from inside MM.
+#
+#  Copyright (c) Microsoft Corporation.
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+  INF_VERSION         &= nbsp;          =3D 0x0001001B<= br> +  BASE_NAME         &nb= sp;            =3D M= mUnblockMemoryLibNull
+  MODULE_UNI_FILE        &nb= sp;       =3D MmUnblockMemoryLibNull.uni
+  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 MmUnblockMemoryLib +
+#
+#  VALID_ARCHITECTURES       &nbs= p;   =3D IA32 X64
+#
+
+[Sources]
+  MmUnblockMemoryLibNull.c
+
+[Packages]
+  MdePkg/MdePkg.dec
diff --git a/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.uni = b/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.uni
new file mode 100644
index 000000000000..d7f2709a3dce
--- /dev/null
+++ b/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.uni
@@ -0,0 +1,21 @@
+// /** @file
+// Null instance of MM Unblock Page Library.
+//
+// This library provides an interface to request non-MMRAM pages to be ma= pped/unblocked
+// from inside MM environment.
+//
+// For MM modules that need to access regions outside of MMRAMs, the agen= ts that set up
+// these regions are responsible for invoking this API in order for these= memory areas
+// to be accessed from inside MM.
+//
+// Copyright (c) Microsoft Corporation.
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT       &nbs= p;     #language en-US "Null instance of MM Unbloc= k Page Library."
+
+#string STR_MODULE_DESCRIPTION       &= nbsp;  #language en-US "This library provides an interface to req= uest non-MMRAM pages to be mapped/unblocked from inside MM environment.\n&q= uot;
+            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;      "For MM modules that need to access r= egions outside of MMRAMs, the agents that set up these regions are responsi= ble for invoking this API in order for these memory areas to be accessed fr= om inside MM."
+
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 3928db65d188..32a9e009c813 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -257,6 +257,11 @@ [LibraryClasses]
   #
   UnitTestHostBaseLib|Test/UnitTest/Include/Library/UnitTestHos= tBaseLib.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.
[Liming] Is this library for DXE driver only? If not, please update this c= omments.

Other part is good t= o me. Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>

 

Thanks

Liming

+  #
+  MmUnblockMemoryLib|Include/Library/MmUnblockMemoryLib.h
+<= /p>

 [LibraryClasse= s.IA32, LibraryClasses.X64]
   ##  @libraryclass  Abstracts both S/W SMI generatio= n and detection.
   ##
diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index ce009086815f..79629e3f93ba 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -168,6 +168,7 @@ [Components.IA32, Components.X64]
   MdePkg/Library/SmmPciExpressLib/SmmPciExpressLib.inf
   MdePkg/Library/SmiHandlerProfileLibNull/SmiHandlerProfileLibN= ull.inf
   MdePkg/Library/MmServicesTableLib/MmServicesTableLib.inf
+  MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf
 
 [Components.EBC]
   MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
--
2.30.0.windows.1

 

 

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