linux-kernel - Re: [PATCH 7/9] KVM: x86: Shuffle code to prepare for dropping guest_cpuid

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Message-ID: <325fd3126a72c926b9d8d0ee060f90ce6d8a582e.camel@redhat.com>
Date:   Sun, 19 Nov 2023 19:35:40 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/9] KVM: x86: Shuffle code to prepare for dropping
 guest_cpuid_has()

On Fri, 2023-11-10 at 15:55 -0800, Sean Christopherson wrote:
> Move the implementations of guest_has_{spec_ctrl,pred_cmd}_msr() down
> below guest_cpu_cap_has() so that their use of guest_cpuid_has() can be
> replaced with calls to guest_cpu_cap_has().
> 
> No functional change intended.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/x86/kvm/cpuid.h | 30 +++++++++++++++---------------
>  1 file changed, 15 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
> index 1707ef10b269..bebf94a69630 100644
> --- a/arch/x86/kvm/cpuid.h
> +++ b/arch/x86/kvm/cpuid.h
> @@ -163,21 +163,6 @@ static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
>  	return x86_stepping(best->eax);
>  }
>  
> -static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
> -{
> -	return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
> -		guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
> -		guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
> -		guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
> -}
> -
> -static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
> -{
> -	return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
> -		guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) ||
> -		guest_cpuid_has(vcpu, X86_FEATURE_SBPB));
> -}
> -
>  static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
>  {
>  	return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
> @@ -298,4 +283,19 @@ static __always_inline bool guest_cpu_cap_has(struct kvm_vcpu *vcpu,
>  	return vcpu->arch.cpu_caps[x86_leaf] & __feature_bit(x86_feature);
>  }
>  
> +static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
> +{
> +	return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
> +		guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
> +		guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
> +		guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
> +}
> +
> +static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
> +{
> +	return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
> +		guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) ||
> +		guest_cpuid_has(vcpu, X86_FEATURE_SBPB));
> +}
> +
>  #endif
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Best regards,
	Maxim Levitsky