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Bit SMM_Code_Access_Chk (SMM-RO) in MSR_SMM_MCA_CAP is defined in SDM. If set to 1 indicates that the SMM code access restriction is supported and the MSR_SMM_FEATURE_CONTROL is supported. If this bit is not set, we needn't to access register SmmFetureControl. Otherwise, #GP exception may happen. Cc: Michael Kinney <michael.d.kinney@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff.fan@intel.com> Reviewed-by: Michael Kinney <michael.d.kinney@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18905 6f19259b-4bc3-4df7-8a09-765794883524