[PATCH] UefiCpuPkg/PiSmmCpuDxeSmm: Clear some semaphores on S3 boot path

[Jeff Fan <jeff.fan@intel.com>]

Some semaphores are not cleared on S3 boot path. For example,
mSmmMpSyncData->CpuData[CpuIndex].Present. It may still keeps the value set at
SMM runtime during S3 resume. It may causes BSP have the wrong judgement on SMM
AP's present state.

We have one related fix at e78a2a49ee6b0c0d7c6997c87ace31d7761cf636. But that is
not completed.

This fix is to clear Busy/Run/Present semaphores in InitializeMpSyncData().

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
---
 UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
index cfbf59e..a873b68 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
@@ -1357,6 +1357,9 @@ InitializeMpSyncData (
         (UINT32 *)((UINTN)mSmmCpuSemaphores.SemaphoreCpu.Run + mSemaphoreSize * CpuIndex);
       mSmmMpSyncData->CpuData[CpuIndex].Present =
         (BOOLEAN *)((UINTN)mSmmCpuSemaphores.SemaphoreCpu.Present + mSemaphoreSize * CpuIndex);
+      *(mSmmMpSyncData->CpuData[CpuIndex].Busy)    = 0;
+      *(mSmmMpSyncData->CpuData[CpuIndex].Run)     = 0;
+      *(mSmmMpSyncData->CpuData[CpuIndex].Present) = FALSE;
     }
   }
 }
-- 
2.9.3.windows.2