Re: [edk2] [Patch 1/2] UefiCpuPkg: Not touch SmmFeatureControl if Code_Access_Chk not Set

Reviewed-by: Michael Kinney Mike -Original Message- From: Fan, Jeff Sent: Tuesday, November 17, 2015 10:45 PM To: edk2-devel@lists.01.org Cc: Kinney, Michael D ; Yao, Jiewen Subject: [Patch 1/2] UefiCpuPkg:

[edk2] [Patch 1/2] UefiCpuPkg: Not touch SmmFeatureControl if Code_Access_Chk not Set

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.