Re: [RFC PATCH v5 032/104] KVM: x86/mmu: introduce config for PRIVATE KVM MMU

[Paolo Bonzini]

On 4/1/22 04:13, Kai Huang wrote:
> > I don't want to use CONFIG_INTEL_TDX_HOST in KVM MMU code.  I think the change
> > to KVM MMU should be a sort of independent from TDX.  But it seems failed based
> > on your feedback.
>
> Why do you need to use any config?  As I said majority of your changes to MMU
> are not under any config.  But I'll leave this to maintainer/reviewers.

There are few uses, but the effect should be pretty large, because the 
config symbol replaces variable accesses with constants:

+static inline gfn_t kvm_gfn_stolen_mask(struct kvm *kvm)
+{
+#ifdef CONFIG_KVM_MMU_PRIVATE
+	return kvm->arch.gfn_shared_mask;
+#else
+	return 0;
+#endif
+}

Please keep it.

Paolo