linux-kernel - Re: [PATCH 53/61] KVM: VMX: Directly use VMX capabilities helper to detect RDTSCP support

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Message-ID: <87pne2lpuv.fsf@vitty.brq.redhat.com>
Date:   Tue, 25 Feb 2020 15:10:32 +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 53/61] KVM: VMX: Directly use VMX capabilities helper to detect RDTSCP support

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

> Use cpu_has_vmx_rdtscp() directly when computing secondary exec controls
> and drop the now defunct vmx_rdtscp_supported().
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>  arch/x86/kvm/vmx/vmx.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index c3577f11f538..98d54cfa0cbe 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -1651,11 +1651,6 @@ static void vmx_queue_exception(struct kvm_vcpu *vcpu)
>  	vmx_clear_hlt(vcpu);
>  }
>  
> -static bool vmx_rdtscp_supported(void)
> -{
> -	return cpu_has_vmx_rdtscp();
> -}
> -
>  /*
>   * Swap MSR entry in host/guest MSR entry array.
>   */
> @@ -4051,7 +4046,7 @@ static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx)
>  		}
>  	}
>  
> -	if (vmx_rdtscp_supported()) {
> +	if (cpu_has_vmx_rdtscp()) {
>  		bool rdtscp_enabled = guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP);
>  		if (!rdtscp_enabled)
>  			exec_control &= ~SECONDARY_EXEC_RDTSCP;

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

-- 
Vitaly