[edk2-devel] [PATCH v1 0/2] SMM CPU Optimization for SMM Init & SMI Process

["Wu, Jiaxin" <jiaxin.wu@intel.com>]

Optimization 1:
Existing CheckFeatureSupported function will check CET & XD features on each processor.
The CPUIDs for CET & XD features are software visible domain, which means a properly configured platform will have consistent values for these CPUID Leafs/SubLeafs/Fields on each logical processor. So, execute Execute CET and XD check only on BSP.
As for MSR_IA32_MISC_ENABLE.BTS, it's core scope according SDM. So, still keep it check on each processor.

Optimization 2:
UefiCpuPkg/PiSmmCpuDxeSmm: Check BspIndex first before lock cmpxchg
This patch is to check BspIndex first before lock cmpxchg operation.
It's the optimization to lower the resource contention caused by the
atomic compare exchange operation, so as to improve the SMI
performance for BSP election.

Jiaxin Wu (2):
  UefiCpuPkg/PiSmmCpuDxeSmm: Execute CET and XD check only on BSP
  UefiCpuPkg/PiSmmCpuDxeSmm: Check BspIndex first before lock cmpxchg

 UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c      | 12 +++--
 UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c |  6 +--
 UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c     | 78 +++++++++++++++++-------------
 UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.h     |  6 ++-
 4 files changed, 59 insertions(+), 43 deletions(-)

-- 
2.16.2.windows.1



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