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SubjectRE: [PATCH v2 08/25] KVM: VMX: Initialize VMCS FRED fields
> >+#ifdef CONFIG_X86_64
> is this #ifdeffery neccesary?

Yes, otherwise build fails on 32 bit.

> I assume kvm_cpu_cap_has(X86_FEATURE_FRED) is always false
> for !CONFIG_X86_64.
> Looks most of FRED changes in core kernel don't have such #ifdeffery.

Because it's not a compile time false, instead false from runtime.

> >+ /* Per-CPU FRED MSRs */
> Please explain why these six MSRs are updated here and why only they are updated in
> this comment.

The explanation is kind of implicit "per-CPU", I will make it more explicit


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