* [PATCH v2] MdePkg/Library: Install dummy variable arch protocol
@ 2019-03-01 11:14 Jagadeesh Ujja
2019-03-01 11:30 ` Ard Biesheuvel
0 siblings, 1 reply; 3+ messages in thread
From: Jagadeesh Ujja @ 2019-03-01 11:14 UTC (permalink / raw)
To: edk2-devel, liming.gao, chao.b.zhang, leif.lindholm,
ard.biesheuvel, star.zeng, Jiewen.Yao, michael.d.kinney
In a system implementing the variable store in MM, there are no variable
arch protocol and variable write arch protocol installed into the
DXE_SMM protocol database. On such systems, it is not required to
locate these protocols by the DXE runtime variable drivers because
it can be assumed that these protocols are already installed in the MM
context. But then such an implementation will deviate from the existing
traditional MM based variable driver implementation.
So in order to maintain consistency with the traditional MM variable
driver implementation, allow platforms to install dummy versions of
these protocols into the DXE protocol database but these protocol will
not be consumed by non-secure variable service runtime driver.
The Platform which uses StandaloneMM based secure variable storage
have to include this library as below.
ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf {
<LibraryClasses>
NULL|MdePkg/Library/VariableMmDependency/VariableMmDependency.inf
}
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jagadeesh Ujja <jagadeesh.ujja@arm.com>
---
Changes since v1:
- This is a next version of patch
“MdeModulePkg/VariableSmmRuntimeDxe: Refactor locating Variable Arch Protocol”.
[https://lists.01.org/pipermail/edk2-devel/2019-February/036885.html]
- Addressed the comments from Ard Biesheuvel and Zeng Star
- Can this library be placed in MdePkg rather then the StandaloneMmPkg?
MdePkg/Library/VariableMmDependency/VariableMmDependency.c | 85 ++++++++++++++++++++
MdePkg/Library/VariableMmDependency/VariableMmDependency.inf | 48 +++++++++++
2 files changed, 133 insertions(+)
diff --git a/MdePkg/Library/VariableMmDependency/VariableMmDependency.c b/MdePkg/Library/VariableMmDependency/VariableMmDependency.c
new file mode 100644
index 0000000..6e5117e
--- /dev/null
+++ b/MdePkg/Library/VariableMmDependency/VariableMmDependency.c
@@ -0,0 +1,85 @@
+/** @file
+ Runtime DXE part corresponding to StanaloneMM variable module.
+
+This module installs dummy variable arch protocol and dummy variable write arch protocol
+to StandaloneMM runtime variable service.
+
+Copyright (c) 2019, ARM Ltd. All rights reserved.
+
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php.
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Library/DebugLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+
+/**
+ Notify the system that the SMM variable driver is ready.
+**/
+VOID
+VariableNotifySmmReady (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ EFI_HANDLE Handle;
+
+ Handle = NULL;
+ Status = gBS->InstallProtocolInterface (
+ &Handle,
+ &gEfiSmmVariableProtocolGuid,
+ EFI_NATIVE_INTERFACE,
+ NULL
+ );
+ ASSERT_EFI_ERROR (Status);
+}
+
+/**
+ Notify the system that the SMM variable write driver is ready.
+**/
+VOID
+VariableNotifySmmWriteReady (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ EFI_HANDLE Handle;
+
+ Handle = NULL;
+ Status = gBS->InstallProtocolInterface (
+ &Handle,
+ &gSmmVariableWriteGuid,
+ EFI_NATIVE_INTERFACE,
+ NULL
+ );
+ ASSERT_EFI_ERROR (Status);
+}
+
+/**
+ The constructor function calls and installs dummy variable arch protocol and
+ dummy variable write arch protocol to StandaloneMM runtime variable service
+
+ @param ImageHandle The firmware allocated handle for the EFI image.
+ @param SystemTable A pointer to the Management mode System Table.
+
+ @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
+
+**/
+EFI_STATUS
+EFIAPI
+VariableMmDependencyLibConstructor (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ VariableNotifySmmReady();
+ VariableNotifySmmWriteReady();
+ return EFI_SUCCESS;
+}
+
diff --git a/MdePkg/Library/VariableMmDependency/VariableMmDependency.inf b/MdePkg/Library/VariableMmDependency/VariableMmDependency.inf
new file mode 100644
index 0000000..09fd200
--- /dev/null
+++ b/MdePkg/Library/VariableMmDependency/VariableMmDependency.inf
@@ -0,0 +1,48 @@
+## @file
+# Runtime DXE part corresponding to StanaloneMM variable module.
+#
+# This module installs dummy variable arch protocol and dummy variable write arch protocol
+# to StandaloneMM runtime variable service.
+#
+# Copyright (c) 2019, ARM Ltd. All rights reserved.
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution. The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+##
+
+[Defines]
+ INF_VERSION = 0x0001001A
+ BASE_NAME = VariableMmDependency
+ FILE_GUID = 64BC4129-778E-4867-BA07-13999A4DEC3F
+ MODULE_TYPE = DXE_RUNTIME_DRIVER
+ VERSION_STRING = 1.0
+ PI_SPECIFICATION_VERSION = 0x00010032
+ LIBRARY_CLASS = NULL
+ CONSTRUCTOR = VariableMmDependencyLibConstructor
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+# VALID_ARCHITECTURES = AARCH64
+#
+#
+
+[Sources]
+ VariableMmDependency.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ MdeModulePkg/MdeModulePkg.dec
+
+[Protocols]
+ gEfiSmmVariableProtocolGuid
+
+[Guids]
+ gSmmVariableWriteGuid
+
+[Depex]
+ TRUE
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] MdePkg/Library: Install dummy variable arch protocol
2019-03-01 11:14 [PATCH v2] MdePkg/Library: Install dummy variable arch protocol Jagadeesh Ujja
@ 2019-03-01 11:30 ` Ard Biesheuvel
2019-03-01 13:32 ` Zeng, Star
0 siblings, 1 reply; 3+ messages in thread
From: Ard Biesheuvel @ 2019-03-01 11:30 UTC (permalink / raw)
To: Jagadeesh Ujja
Cc: edk2-devel@lists.01.org, Gao, Liming, Zhang, Chao B,
Leif Lindholm, Zeng, Star, Yao, Jiewen, Kinney, Michael D
On Fri, 1 Mar 2019 at 12:14, Jagadeesh Ujja <jagadeesh.ujja@arm.com> wrote:
>
> In a system implementing the variable store in MM, there are no variable
> arch protocol and variable write arch protocol installed into the
> DXE_SMM protocol database. On such systems, it is not required to
> locate these protocols by the DXE runtime variable drivers because
> it can be assumed that these protocols are already installed in the MM
> context. But then such an implementation will deviate from the existing
> traditional MM based variable driver implementation.
>
> So in order to maintain consistency with the traditional MM variable
> driver implementation, allow platforms to install dummy versions of
> these protocols into the DXE protocol database but these protocol will
> not be consumed by non-secure variable service runtime driver.
>
> The Platform which uses StandaloneMM based secure variable storage
> have to include this library as below.
>
> ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf {
> <LibraryClasses>
> NULL|MdePkg/Library/VariableMmDependency/VariableMmDependency.inf
> }
>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Jagadeesh Ujja <jagadeesh.ujja@arm.com>
> ---
> Changes since v1:
> - This is a next version of patch
> “MdeModulePkg/VariableSmmRuntimeDxe: Refactor locating Variable Arch Protocol”.
> [https://lists.01.org/pipermail/edk2-devel/2019-February/036885.html]
> - Addressed the comments from Ard Biesheuvel and Zeng Star
> - Can this library be placed in MdePkg rather then the StandaloneMmPkg?
>
This does not belong in MdePkg. What is wrong with keeping it in
StandaloneMmPkg?
> MdePkg/Library/VariableMmDependency/VariableMmDependency.c | 85 ++++++++++++++++++++
> MdePkg/Library/VariableMmDependency/VariableMmDependency.inf | 48 +++++++++++
> 2 files changed, 133 insertions(+)
>
> diff --git a/MdePkg/Library/VariableMmDependency/VariableMmDependency.c b/MdePkg/Library/VariableMmDependency/VariableMmDependency.c
> new file mode 100644
> index 0000000..6e5117e
> --- /dev/null
> +++ b/MdePkg/Library/VariableMmDependency/VariableMmDependency.c
> @@ -0,0 +1,85 @@
> +/** @file
> + Runtime DXE part corresponding to StanaloneMM variable module.
> +
> +This module installs dummy variable arch protocol and dummy variable write arch protocol
> +to StandaloneMM runtime variable service.
> +
I think 'dummy' is a misnomer here. They are NULL protocols in the
sense that only their presence is signifcant, and the protocol does
not have an implementation. But this is true for traditional MM as
well.
> +Copyright (c) 2019, ARM Ltd. All rights reserved.
> +
> +This program and the accompanying materials
> +are licensed and made available under the terms and conditions of the BSD License
> +which accompanies this distribution. The full text of the license may be found at
> +http://opensource.org/licenses/bsd-license.php.
> +
> +THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
> +WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
> +
> +**/
> +
> +#include <Library/DebugLib.h>
> +#include <Library/UefiBootServicesTableLib.h>
> +
> +/**
> + Notify the system that the SMM variable driver is ready.
> +**/
> +VOID
> +VariableNotifySmmReady (
> + VOID
> + )
> +{
> + EFI_STATUS Status;
> + EFI_HANDLE Handle;
> +
> + Handle = NULL;
> + Status = gBS->InstallProtocolInterface (
> + &Handle,
> + &gEfiSmmVariableProtocolGuid,
> + EFI_NATIVE_INTERFACE,
> + NULL
> + );
> + ASSERT_EFI_ERROR (Status);
> +}
> +
> +/**
> + Notify the system that the SMM variable write driver is ready.
> +**/
> +VOID
> +VariableNotifySmmWriteReady (
> + VOID
> + )
> +{
> + EFI_STATUS Status;
> + EFI_HANDLE Handle;
> +
> + Handle = NULL;
> + Status = gBS->InstallProtocolInterface (
> + &Handle,
> + &gSmmVariableWriteGuid,
> + EFI_NATIVE_INTERFACE,
> + NULL
> + );
> + ASSERT_EFI_ERROR (Status);
> +}
> +
> +/**
> + The constructor function calls and installs dummy variable arch protocol and
> + dummy variable write arch protocol to StandaloneMM runtime variable service
> +
> + @param ImageHandle The firmware allocated handle for the EFI image.
> + @param SystemTable A pointer to the Management mode System Table.
> +
> + @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +VariableMmDependencyLibConstructor (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +{
> + VariableNotifySmmReady();
> + VariableNotifySmmWriteReady();
> + return EFI_SUCCESS;
> +}
> +
Can we replace all of this with a single call to
InstallMultipleProtocolInterfaces() please?
> diff --git a/MdePkg/Library/VariableMmDependency/VariableMmDependency.inf b/MdePkg/Library/VariableMmDependency/VariableMmDependency.inf
> new file mode 100644
> index 0000000..09fd200
> --- /dev/null
> +++ b/MdePkg/Library/VariableMmDependency/VariableMmDependency.inf
> @@ -0,0 +1,48 @@
> +## @file
> +# Runtime DXE part corresponding to StanaloneMM variable module.
> +#
> +# This module installs dummy variable arch protocol and dummy variable write arch protocol
> +# to StandaloneMM runtime variable service.
> +#
> +# Copyright (c) 2019, ARM Ltd. All rights reserved.
> +# This program and the accompanying materials
> +# are licensed and made available under the terms and conditions of the BSD License
> +# which accompanies this distribution. The full text of the license may be found at
> +# http://opensource.org/licenses/bsd-license.php
> +# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
> +# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
> +#
> +##
> +
> +[Defines]
> + INF_VERSION = 0x0001001A
> + BASE_NAME = VariableMmDependency
> + FILE_GUID = 64BC4129-778E-4867-BA07-13999A4DEC3F
> + MODULE_TYPE = DXE_RUNTIME_DRIVER
Better use DXE_DRIVER here
> + VERSION_STRING = 1.0
> + PI_SPECIFICATION_VERSION = 0x00010032
You can drop this
> + LIBRARY_CLASS = NULL
> + CONSTRUCTOR = VariableMmDependencyLibConstructor
> +
> +#
> +# The following information is for reference only and not required by the build tools.
> +#
> +# VALID_ARCHITECTURES = AARCH64
> +#
> +#
> +
> +[Sources]
> + VariableMmDependency.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + MdeModulePkg/MdeModulePkg.dec
> +
> +[Protocols]
> + gEfiSmmVariableProtocolGuid
> +
> +[Guids]
> + gSmmVariableWriteGuid
> +
This looks slightly inconsistent, but it actually matches what
MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf does.
So perhaps you could add the same annotation here as well:
[Protocols]
gEfiSmmVariableProtocolGuid ## PRODUCES
[Guids]
gSmmVariableWriteGuid ## PRODUCES
## GUID # Install protocol
> +[Depex]
> + TRUE
> --
> 2.7.4
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] MdePkg/Library: Install dummy variable arch protocol
2019-03-01 11:30 ` Ard Biesheuvel
@ 2019-03-01 13:32 ` Zeng, Star
0 siblings, 0 replies; 3+ messages in thread
From: Zeng, Star @ 2019-03-01 13:32 UTC (permalink / raw)
To: Ard Biesheuvel, Jagadeesh Ujja
Cc: edk2-devel@lists.01.org, Gao, Liming, Zhang, Chao B,
Leif Lindholm, Yao, Jiewen, Kinney, Michael D, Zeng, Star
Agree with Ard's feedbacks.
And it seems only needed for VariableSmmRuntimeDxe to co-work with VariableStandaloneMm.
So is it more suitable to be in StandaloneMmPkg?
Thanks,
Star
-----Original Message-----
From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org]
Sent: Friday, March 1, 2019 7:31 PM
To: Jagadeesh Ujja <jagadeesh.ujja@arm.com>
Cc: edk2-devel@lists.01.org; Gao, Liming <liming.gao@intel.com>; Zhang, Chao B <chao.b.zhang@intel.com>; Leif Lindholm <leif.lindholm@linaro.org>; Zeng, Star <star.zeng@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>
Subject: Re: [PATCH v2] MdePkg/Library: Install dummy variable arch protocol
On Fri, 1 Mar 2019 at 12:14, Jagadeesh Ujja <jagadeesh.ujja@arm.com> wrote:
>
> In a system implementing the variable store in MM, there are no
> variable arch protocol and variable write arch protocol installed into
> the DXE_SMM protocol database. On such systems, it is not required to
> locate these protocols by the DXE runtime variable drivers because it
> can be assumed that these protocols are already installed in the MM
> context. But then such an implementation will deviate from the
> existing traditional MM based variable driver implementation.
>
> So in order to maintain consistency with the traditional MM variable
> driver implementation, allow platforms to install dummy versions of
> these protocols into the DXE protocol database but these protocol will
> not be consumed by non-secure variable service runtime driver.
>
> The Platform which uses StandaloneMM based secure variable storage
> have to include this library as below.
>
> ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf {
> <LibraryClasses>
> NULL|MdePkg/Library/VariableMmDependency/VariableMmDependency.inf
> }
>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Jagadeesh Ujja <jagadeesh.ujja@arm.com>
> ---
> Changes since v1:
> - This is a next version of patch
> “MdeModulePkg/VariableSmmRuntimeDxe: Refactor locating Variable Arch Protocol”.
>
> [https://lists.01.org/pipermail/edk2-devel/2019-February/036885.html]
> - Addressed the comments from Ard Biesheuvel and Zeng Star
> - Can this library be placed in MdePkg rather then the StandaloneMmPkg?
>
This does not belong in MdePkg. What is wrong with keeping it in StandaloneMmPkg?
> MdePkg/Library/VariableMmDependency/VariableMmDependency.c | 85 ++++++++++++++++++++
> MdePkg/Library/VariableMmDependency/VariableMmDependency.inf | 48
> +++++++++++
> 2 files changed, 133 insertions(+)
>
> diff --git
> a/MdePkg/Library/VariableMmDependency/VariableMmDependency.c
> b/MdePkg/Library/VariableMmDependency/VariableMmDependency.c
> new file mode 100644
> index 0000000..6e5117e
> --- /dev/null
> +++ b/MdePkg/Library/VariableMmDependency/VariableMmDependency.c
> @@ -0,0 +1,85 @@
> +/** @file
> + Runtime DXE part corresponding to StanaloneMM variable module.
> +
> +This module installs dummy variable arch protocol and dummy variable
> +write arch protocol to StandaloneMM runtime variable service.
> +
I think 'dummy' is a misnomer here. They are NULL protocols in the sense that only their presence is signifcant, and the protocol does not have an implementation. But this is true for traditional MM as well.
> +Copyright (c) 2019, ARM Ltd. All rights reserved.
> +
> +This program and the accompanying materials are licensed and made
> +available under the terms and conditions of the BSD License which
> +accompanies this distribution. The full text of the license may be
> +found at http://opensource.org/licenses/bsd-license.php.
> +
> +THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
> +WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
> +
> +**/
> +
> +#include <Library/DebugLib.h>
> +#include <Library/UefiBootServicesTableLib.h>
> +
> +/**
> + Notify the system that the SMM variable driver is ready.
> +**/
> +VOID
> +VariableNotifySmmReady (
> + VOID
> + )
> +{
> + EFI_STATUS Status;
> + EFI_HANDLE Handle;
> +
> + Handle = NULL;
> + Status = gBS->InstallProtocolInterface (
> + &Handle,
> + &gEfiSmmVariableProtocolGuid,
> + EFI_NATIVE_INTERFACE,
> + NULL
> + );
> + ASSERT_EFI_ERROR (Status);
> +}
> +
> +/**
> + Notify the system that the SMM variable write driver is ready.
> +**/
> +VOID
> +VariableNotifySmmWriteReady (
> + VOID
> + )
> +{
> + EFI_STATUS Status;
> + EFI_HANDLE Handle;
> +
> + Handle = NULL;
> + Status = gBS->InstallProtocolInterface (
> + &Handle,
> + &gSmmVariableWriteGuid,
> + EFI_NATIVE_INTERFACE,
> + NULL
> + );
> + ASSERT_EFI_ERROR (Status);
> +}
> +
> +/**
> + The constructor function calls and installs dummy variable arch
> +protocol and
> + dummy variable write arch protocol to StandaloneMM runtime variable
> +service
> +
> + @param ImageHandle The firmware allocated handle for the EFI image.
> + @param SystemTable A pointer to the Management mode System Table.
> +
> + @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +VariableMmDependencyLibConstructor (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +{
> + VariableNotifySmmReady();
> + VariableNotifySmmWriteReady();
> + return EFI_SUCCESS;
> +}
> +
Can we replace all of this with a single call to
InstallMultipleProtocolInterfaces() please?
> diff --git
> a/MdePkg/Library/VariableMmDependency/VariableMmDependency.inf
> b/MdePkg/Library/VariableMmDependency/VariableMmDependency.inf
> new file mode 100644
> index 0000000..09fd200
> --- /dev/null
> +++ b/MdePkg/Library/VariableMmDependency/VariableMmDependency.inf
> @@ -0,0 +1,48 @@
> +## @file
> +# Runtime DXE part corresponding to StanaloneMM variable module.
> +#
> +# This module installs dummy variable arch protocol and dummy
> +variable write arch protocol # to StandaloneMM runtime variable service.
> +#
> +# Copyright (c) 2019, ARM Ltd. All rights reserved.
> +# This program and the accompanying materials # are licensed and made
> +available under the terms and conditions of the BSD License # which
> +accompanies this distribution. The full text of the license may be
> +found at # http://opensource.org/licenses/bsd-license.php
> +# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS"
> +BASIS, # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
> +#
> +##
> +
> +[Defines]
> + INF_VERSION = 0x0001001A
> + BASE_NAME = VariableMmDependency
> + FILE_GUID = 64BC4129-778E-4867-BA07-13999A4DEC3F
> + MODULE_TYPE = DXE_RUNTIME_DRIVER
Better use DXE_DRIVER here
> + VERSION_STRING = 1.0
> + PI_SPECIFICATION_VERSION = 0x00010032
You can drop this
> + LIBRARY_CLASS = NULL
> + CONSTRUCTOR = VariableMmDependencyLibConstructor
> +
> +#
> +# The following information is for reference only and not required by the build tools.
> +#
> +# VALID_ARCHITECTURES = AARCH64
> +#
> +#
> +
> +[Sources]
> + VariableMmDependency.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + MdeModulePkg/MdeModulePkg.dec
> +
> +[Protocols]
> + gEfiSmmVariableProtocolGuid
> +
> +[Guids]
> + gSmmVariableWriteGuid
> +
This looks slightly inconsistent, but it actually matches what MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf does.
So perhaps you could add the same annotation here as well:
[Protocols]
gEfiSmmVariableProtocolGuid ## PRODUCES
[Guids]
gSmmVariableWriteGuid ## PRODUCES
## GUID # Install protocol
> +[Depex]
> + TRUE
> --
> 2.7.4
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-03-01 11:14 [PATCH v2] MdePkg/Library: Install dummy variable arch protocol Jagadeesh Ujja
2019-03-01 11:30 ` Ard Biesheuvel
2019-03-01 13:32 ` Zeng, Star
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