linux-kernel - Re: [PATCH v2 07/21] KVM: x86: Add a framework for enabling KVM-governed x86 features

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Message-ID: <ZNpiaGsEnoOxAspP@google.com>
Date:   Mon, 14 Aug 2023 10:20:40 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Zeng Guang <guang.zeng@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: Re: [PATCH v2 07/21] KVM: x86: Add a framework for enabling
 KVM-governed x86 features

On Mon, Aug 14, 2023, Zeng Guang wrote:
> 
> On 7/29/2023 9:15 AM, Sean Christopherson wrote:
> > +static __always_inline int kvm_governed_feature_index(unsigned int x86_feature)
> > +{
> > +	switch (x86_feature) {
> > +#define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x;
> > +#include "governed_features.h"
> > +	default:
> > +		return -1;
> > +	}
> > +}
> > +
> > +static __always_inline int kvm_is_governed_feature(unsigned int x86_feature)
> > +{
> > +	return kvm_governed_feature_index(x86_feature) >= 0;
> > +}
> > +
> 
> I think it proper to return a bool, not "int" instead.

Yeah.  I'm pretty sure someone brought this up in v1 too, and I spaced on it.