linux-kernel - Re: [PATCH 27/61] KVM: x86: Introduce cpuid_entry

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Date:   Mon, 24 Feb 2020 14:42:19 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 27/61] KVM: x86: Introduce
 cpuid_entry_{change,set,clear}() mutators

On Mon, Feb 24, 2020 at 02:43:07PM +0100, Vitaly Kuznetsov wrote:
> Sean Christopherson <sean.j.christopherson@...el.com> writes:
> 
> > diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
> > index 64e96e4086e2..51f19eade5a0 100644
> > --- a/arch/x86/kvm/cpuid.h
> > +++ b/arch/x86/kvm/cpuid.h
> > @@ -135,6 +135,37 @@ static __always_inline bool cpuid_entry_has(struct kvm_cpuid_entry2 *entry,
> >  	return cpuid_entry_get(entry, x86_feature);
> >  }
> >  
> > +static __always_inline void cpuid_entry_clear(struct kvm_cpuid_entry2 *entry,
> > +					      unsigned x86_feature)
> > +{
> > +	u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
> > +
> > +	*reg &= ~__feature_bit(x86_feature);
> > +}
> > +
> > +static __always_inline void cpuid_entry_set(struct kvm_cpuid_entry2 *entry,
> > +					    unsigned x86_feature)
> > +{
> > +	int *reg = cpuid_entry_get_reg(entry, x86_feature);
> 
> I think 'reg' should be 'u32', similar to cpuid_entry_clear()

Doh, thanks!

> > +
> > +	*reg |= __feature_bit(x86_feature);
> > +}
> > +
> > +static __always_inline void cpuid_entry_change(struct kvm_cpuid_entry2 *entry,
> > +					       unsigned x86_feature, bool set)
> > +{
> > +	int *reg = cpuid_entry_get_reg(entry, x86_feature);
> 
> Ditto.
>