Re: [PATCH] UefiCpuPkg/PiSmmCpuDxeSmm: Check ProcessorId == INVALID_APIC_ID

["Dong, Eric" <eric.dong@intel.com>]

Reviewed-by: Eric Dong <eric.dong@intel.com>

-----Original Message-----
From: Fan, Jeff 
Sent: Wednesday, May 10, 2017 4:34 PM
To: edk2-devel@lists.01.org
Cc: Yao, Jiewen; Dong, Eric
Subject: [PATCH] UefiCpuPkg/PiSmmCpuDxeSmm: Check ProcessorId == INVALID_APIC_ID

If PcdCpuHotPlugSupport is TRUE, gSmst->NumberOfCpus will be the PcdCpuMaxLogicalProcessorNumber. If gSmst->SmmStartupThisAp() is invoked for those un-existed processors, ASSERT() happened in ConfigSmmCodeAccessCheck().

This fix is to check if ProcessorId is valid before invoke
gSmst->SmmStartupThisAp() in ConfigSmmCodeAccessCheck() and to check if
ProcessorId is valid in InternalSmmStartupThisAp() to avoid unexpected DEBUG error message displayed.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
---
 UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c      | 3 +++
 UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c | 7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
index e03f1e0..4ac5e8e 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
@@ -860,6 +860,9 @@ InternalSmmStartupThisAp (
     DEBUG((DEBUG_ERROR, "CpuIndex(%d) == gSmmCpuPrivate->SmmCoreEntryContext.CurrentlyExecutingCpu\n", CpuIndex));
     return EFI_INVALID_PARAMETER;
   }
+  if (gSmmCpuPrivate->ProcessorInfo[CpuIndex].ProcessorId == INVALID_APIC_ID) {
+    return EFI_INVALID_PARAMETER;
+  }
   if (!(*(mSmmMpSyncData->CpuData[CpuIndex].Present))) {
     if (mSmmMpSyncData->EffectiveSyncMode == SmmCpuSyncModeTradition) {
       DEBUG((DEBUG_ERROR, "!mSmmMpSyncData->CpuData[%d].Present\n", CpuIndex)); diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
index 2d6b572..8e79642 100755
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
@@ -1117,7 +1117,12 @@ ConfigSmmCodeAccessCheck (
   //
   for (Index = 0; Index < gSmst->NumberOfCpus; Index++) {
     if (Index != gSmmCpuPrivate->SmmCoreEntryContext.CurrentlyExecutingCpu) {
-
+      if (gSmmCpuPrivate->ProcessorInfo[Index].ProcessorId == INVALID_APIC_ID) {
+        //
+        // If this processor does not exist
+        //
+        continue;
+      }
       //
       // Acquire Config SMM Code Access Check spin lock.  The AP will release the
       // spin lock when it is done executing ConfigSmmCodeAccessCheckOnCurrentProcessor().
--
2.9.3.windows.2