linux-kernel - Re: [PATCH 25/61] KVM: x86: Use u32 for holding CPUID register value in helpers

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Message-ID: <878skwq72q.fsf@vitty.brq.redhat.com>
Date:   Fri, 21 Feb 2020 16:43:41 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.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 25/61] KVM: x86: Use u32 for holding CPUID register value in helpers

Sean Christopherson <sean.j.christopherson@...el.com> writes:

> Change the intermediate CPUID output register values from "int" to "u32"
> to match both hardware and the storage type in struct cpuid_reg.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>  arch/x86/kvm/cpuid.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
> index c1ac0995843d..72a79bdfed6b 100644
> --- a/arch/x86/kvm/cpuid.h
> +++ b/arch/x86/kvm/cpuid.h
> @@ -95,7 +95,7 @@ static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
>  	return reverse_cpuid[x86_leaf];
>  }
>  
> -static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature)
> +static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature)
>  {
>  	struct kvm_cpuid_entry2 *entry;
>  	const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
> @@ -121,7 +121,7 @@ static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsi
>  
>  static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature)
>  {
> -	int *reg;
> +	u32 *reg;
>  
>  	reg = guest_cpuid_get_register(vcpu, x86_feature);
>  	if (!reg)
> @@ -132,7 +132,7 @@ static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_
>  
>  static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
>  {
> -	int *reg;
> +	u32 *reg;
>  
>  	reg = guest_cpuid_get_register(vcpu, x86_feature);
>  	if (reg)

Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>

-- 
Vitaly