Re: [PATCH] UefiCpuPkg/FeaturesLib: don't init MCi_CTL/STATUS when MCA's disabled

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

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

-----Original Message-----
From: Ni, Ruiyu 
Sent: Thursday, February 8, 2018 2:44 PM
To: edk2-devel@lists.01.org
Cc: Dong, Eric <eric.dong@intel.com>
Subject: [PATCH] UefiCpuPkg/FeaturesLib: don't init MCi_CTL/STATUS when MCA's disabled

Today's McaInitialize() doesn't check State value before initialize MCi_CTL and MCi_STATUS.
The patch fixes this issue by only initializing the two kinds of MSRs when State is enabled.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
---
 .../Library/CpuCommonFeaturesLib/MachineCheck.c    | 32 ++++++++++++----------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c b/UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c
index 58dc45aeda..cc64dbbf0a 100644
--- a/UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c
+++ b/UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c
@@ -1,7 +1,7 @@
 /** @file
   Machine Check features.
 
-  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2017 - 2018, Intel Corporation. All rights 
+ reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at @@ -140,25 +140,27 @@ McaInitialize (
   MSR_IA32_MCG_CAP_REGISTER  McgCap;
   UINT32                     BankIndex;
 
-  McgCap.Uint64 = AsmReadMsr64 (MSR_IA32_MCG_CAP);
-  for (BankIndex = 0; BankIndex < (UINT32) McgCap.Bits.Count; BankIndex++) {
-    CPU_REGISTER_TABLE_WRITE64 (
-      ProcessorNumber,
-      Msr,
-      MSR_IA32_MC0_CTL + BankIndex * 4,
-      MAX_UINT64
-      );
-  }
-
-  if (PcdGetBool (PcdIsPowerOnReset)) {
-    for (BankIndex = 0; BankIndex < (UINTN) McgCap.Bits.Count; BankIndex++) {
+  if (State == TRUE) {
+    McgCap.Uint64 = AsmReadMsr64 (MSR_IA32_MCG_CAP);
+    for (BankIndex = 0; BankIndex < (UINT32) McgCap.Bits.Count; 
+ BankIndex++) {
       CPU_REGISTER_TABLE_WRITE64 (
         ProcessorNumber,
         Msr,
-        MSR_IA32_MC0_STATUS + BankIndex * 4,
-        0
+        MSR_IA32_MC0_CTL + BankIndex * 4,
+        MAX_UINT64
         );
     }
+
+    if (PcdGetBool (PcdIsPowerOnReset)) {
+      for (BankIndex = 0; BankIndex < (UINTN) McgCap.Bits.Count; BankIndex++) {
+        CPU_REGISTER_TABLE_WRITE64 (
+          ProcessorNumber,
+          Msr,
+          MSR_IA32_MC0_STATUS + BankIndex * 4,
+          0
+          );
+      }
+    }
   }
 
   return RETURN_SUCCESS;
--
2.16.1.windows.1