UefiCpuPkg/MpLib: Remove NotifyOnS3SmmInitDonePpi

Previously, the SMM S3 resume code required taking control of APs to
perform SMM rebase, which would overwrite the context set by MpLib.
As a result, MpLib needed to wake up APs using InitSipiSipi to restore
the context after SMM S3 resume.

With the recent change where SMM rebase occurs in the early PEI phase,
the SMM S3 resume code no longer modifies AP context. Therefore, the
forced use of InitSipiSipi after SMM S3 resume is no longer necessary.

Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>

Author: LiuZhiguang001

UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf

@@ -87,7 +87,6 @@
   gEdkiiPeiShadowMicrocodePpiGuid        ## SOMETIMES_CONSUMES
 
 [Guids]
-  gEdkiiS3SmmInitDoneGuid
   gEdkiiMicrocodePatchHobGuid
   gGhcbApicIdsGuid                       ## SOMETIMES_CONSUMES
   gEdkiiEndOfS3ResumeGuid

UefiCpuPkg/Library/MpInitLib/PeiMpLib.c

@@ -14,68 +14,6 @@
 
 STATIC UINT64  mSevEsPeiWakeupBuffer = BASE_1MB;
 
-/**
-  S3 SMM Init Done notification function.
-
-  @param  PeiServices      Indirect reference to the PEI Services Table.
-  @param  NotifyDesc       Address of the notification descriptor data structure.
-  @param  InvokePpi        Address of the PPI that was invoked.
-
-  @retval EFI_SUCCESS      The function completes successfully.
-
-**/
-EFI_STATUS
-EFIAPI
-NotifyOnS3SmmInitDonePpi (
-  IN  EFI_PEI_SERVICES           **PeiServices,
-  IN  EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDesc,
-  IN  VOID                       *InvokePpi
-  );
-
-//
-// Global function
-//
-EFI_PEI_NOTIFY_DESCRIPTOR  mS3SmmInitDoneNotifyDesc = {
-  EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
-  &gEdkiiS3SmmInitDoneGuid,
-  NotifyOnS3SmmInitDonePpi
-};
-
-/**
-  S3 SMM Init Done notification function.
-
-  @param  PeiServices      Indirect reference to the PEI Services Table.
-  @param  NotifyDesc       Address of the notification descriptor data structure.
-  @param  InvokePpi        Address of the PPI that was invoked.
-
-  @retval EFI_SUCCESS      The function completes successfully.
-
-**/
-EFI_STATUS
-EFIAPI
-NotifyOnS3SmmInitDonePpi (
-  IN  EFI_PEI_SERVICES           **PeiServices,
-  IN  EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDesc,
-  IN  VOID                       *InvokePpi
-  )
-{
-  CPU_MP_DATA  *CpuMpData;
-
-  CpuMpData = GetCpuMpData ();
-
-  //
-  // PiSmmCpuDxeSmm driver hardcode change the loop mode to HLT mode.
-  // So in this notify function, code need to check the current loop
-  // mode, if it is not HLT mode, code need to change loop mode back
-  // to the original mode.
-  //
-  if (CpuMpData->ApLoopMode != ApInHltLoop) {
-    CpuMpData->WakeUpByInitSipiSipi = TRUE;
-  }
-
-  return EFI_SUCCESS;
-}
-
 /**
   Enable Debug Agent to support source debugging on AP function.
 
@@ -510,8 +448,6 @@ InitMpGlobalData (
   ///
   /// Install Notify
   ///
-  Status = PeiServicesNotifyPpi (&mS3SmmInitDoneNotifyDesc);
-  ASSERT_EFI_ERROR (Status);
 
   Status = PeiServicesNotifyPpi (&mEndOfS3ResumeNotifyDesc);
   ASSERT_EFI_ERROR (Status);