MSR_IA32_FEATURE_CONTROL lock bit is set in kernel version 5.x
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purplewall1206 commented
MSR_IA32_FEATURE_CONTROL.lock[0bit] = 1 is set in kernel version 5.x by default.
which means no modification to MSRs is allowed until the system reboot.
the code in ksm.c is invalid anymore.
// ksm.c int __ksm_init_cpu(struct ksm *k)
feat_ctl = __readmsr(MSR_IA32_FEATURE_CONTROL);
if ((feat_ctl & required_feat_bits) != required_feat_bits) {