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UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile: Remove unnecessary BTS MSRs

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BTS used DS save area by IA32_DS_AREA MSR to get invoker IP instead of the
Last Branch Record Stack. So, removed the unnecessary BTS MSRs.

Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Jeff Fan
2016-04-05 14:33:45 +08:00
committed by Michael Kinney
parent 4b1f9ac19d
commit 846704334c
2 changed files with 1 additions and 6 deletions
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2
UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c
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@@ -1071,8 +1071,6 @@ ActivateLBR (
if ((DebugCtl & MSR_DEBUG_CTL_LBR) != 0) {
return ;
}
AsmWriteMsr64 (MSR_LER_FROM_LIP, 0);
AsmWriteMsr64 (MSR_LER_TO_LIP, 0);
DebugCtl |= MSR_DEBUG_CTL_LBR;
AsmWriteMsr64 (MSR_DEBUG_CTL, DebugCtl);
}