MdeModulePkg Variable: Prevent BS variable update in legacy OS runtime.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17467 6f19259b-4bc3-4df7-8a09-765794883524

diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
index 3a8729816094b1664e2628f6dd8f9f1307de2f03..0e0a7c5c3b5ac541e35b92ae6a5f886443a43b20 100644 (file)
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
@@ -997,6 +997,7 @@ VariableSmmRuntimeInitialize (
   VOID                                      *SmmVariableWriteRegistration;\r
   EFI_EVENT                                 OnReadyToBootEvent;\r
   EFI_EVENT                                 ExitBootServiceEvent;\r
+  EFI_EVENT                                 LegacyBootEvent;\r
 \r
   EfiInitializeLock (&mVariableServicesLock, TPL_NOTIFY);\r
 \r
@@ -1064,6 +1065,17 @@ VariableSmmRuntimeInitialize (
          &ExitBootServiceEvent\r
          ); \r
 \r
+  //\r
+  // Register the event to inform SMM variable that it is at runtime for legacy boot.\r
+  // Reuse OnExitBootServices() here.\r
+  //\r
+  EfiCreateEventLegacyBootEx(\r
+    TPL_NOTIFY,\r
+    OnExitBootServices,\r
+    NULL,\r
+    &LegacyBootEvent\r
+    );\r
+\r
   //\r
   // Register the event to convert the pointer for runtime.\r
   //\r