[edk2-devel] [PATCH v1 2/2] MdeModulePkg: Modified VariableSmm driver to use new interface SmmWaitForAllProcessor().

[Li, Zhihao]

From: Zhihao Li <zhihao...@intel.com>

REF： https://bugzilla.tianocore.org/show_bug.cgi?id=3815

Last patch extends the SMM CPU Service protocol with new interface
SmmWaitForAllProcessor(), which can be used by SMI handler to optionally
wait for other APs to complete SMM rendezvous in relaxed AP mode.
A new library SmmCpuRendezvousLib is provided to abstract the service
into library API to simple SMI handler code.

This patch modified VariableSmm driver in MdeModulePkg to let the SMI handler 
wait
for all APs complete SMM rendezvous when policy is AP relaxed mode.

Cc: Jian J Wang <jian.j.w...@intel.com>
Cc: Liming Gao <gaolim...@byosoft.com.cn>

Signed-off-by: Zhihao Li <zhihao...@intel.com>
---
 MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c   | 8 ++++++++
 MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c 
b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c
index 517cae7b00..1109f06833 100644
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c
@@ -28,6 +28,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 

 #include <Library/MmServicesTableLib.h>

 #include <Library/VariablePolicyLib.h>

+#include <Library/SmmCpuRendezvousLib.h>

 

 #include <Guid/SmmVariableCommon.h>

 #include "Variable.h"

@@ -656,6 +657,13 @@ SmmVariableHandler (
         goto EXIT;

       }

 

+      if ((SmmVariableHeader->Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {

+        if (!SmmWaitForAllProcessor (TRUE)) {

+          DEBUG ((EFI_D_ERROR, "SetVariable: fail to wait for all AP check in 
SMM!\n"));

+          goto EXIT;

+        }

+      }

+

       Status = VariableServiceSetVariable (

                  SmmVariableHeader->Name,

                  &SmmVariableHeader->Guid,

diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf 
b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf
index eaa97a01c6..206a5a7e2d 100644
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf
@@ -63,6 +63,7 @@
 [Packages]

   MdePkg/MdePkg.dec

   MdeModulePkg/MdeModulePkg.dec

+  UefiCpuPkg/UefiCpuPkg.dec

 

 [LibraryClasses]

   UefiDriverEntryPoint

@@ -82,6 +83,7 @@
   UefiBootServicesTableLib

   VariablePolicyLib

   VariablePolicyHelperLib

+  SmmCpuRendezvousLib

 

 [Protocols]

   gEfiSmmFirmwareVolumeBlockProtocolGuid        ## CONSUMES

-- 
2.26.2.windows.1



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