X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=UefiCpuPkg%2FLibrary%2FCpuCommonFeaturesLib%2FMachineCheck.c;h=c4eca062fdcdecda72235e9035ff4805c6161c2e;hp=58dc45aedaf0469490684b370eec8c2022fef1a0;hb=7367cc6c24d01b400d2370ffd58ae02854a56b32;hpb=57d1afc88950401a322e8679bbf89ec57ba8e992

diff --git a/UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c b/UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c
index 58dc45aeda..c4eca062fd 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) {
+    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;
@@ -233,7 +235,7 @@ McgCtlInitialize (
 }
 
 /**
-  Detects if Local machine check exception feature supported on current 
+  Detects if Local machine check exception feature supported on current
   processor.
 
   @param[in]  ProcessorNumber  The index of the CPU executing this function.