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MSR_IA32_FEATURE_CONTROL lock bit is set in kernel version 5.x #34

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purplewall1206 opened this issue Apr 12, 2022 · 0 comments

purplewall1206 commented Apr 12, 2022

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) {

The text was updated successfully, but these errors were encountered:

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