linux-kernel - Re: [PATCH 54/61] KVM: x86: Check for Intel PT MSR virtualization using KVM cpu caps

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Date:   Tue, 25 Feb 2020 15:11:35 +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 54/61] KVM: x86: Check for Intel PT MSR virtualization using KVM cpu caps

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

> Use kvm_cpu_cap_has() to check for Intel PT when processing the list of
> virtualized MSRs to pave the way toward removing ->pt_supported().
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>  arch/x86/kvm/x86.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index e4353c03269c..9d38dcdbb613 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -5251,23 +5251,23 @@ static void kvm_init_msr_list(void)
>  			break;
>  		case MSR_IA32_RTIT_CTL:
>  		case MSR_IA32_RTIT_STATUS:
> -			if (!kvm_x86_ops->pt_supported())
> +			if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT))
>  				continue;
>  			break;
>  		case MSR_IA32_RTIT_CR3_MATCH:
> -			if (!kvm_x86_ops->pt_supported() ||
> +			if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
>  			    !intel_pt_validate_hw_cap(PT_CAP_cr3_filtering))
>  				continue;
>  			break;
>  		case MSR_IA32_RTIT_OUTPUT_BASE:
>  		case MSR_IA32_RTIT_OUTPUT_MASK:
> -			if (!kvm_x86_ops->pt_supported() ||
> +			if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
>  				(!intel_pt_validate_hw_cap(PT_CAP_topa_output) &&
>  				 !intel_pt_validate_hw_cap(PT_CAP_single_range_output)))
>  				continue;
>  			break;
>  		case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B: {
> -			if (!kvm_x86_ops->pt_supported() ||
> +			if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
>  				msrs_to_save_all[i] - MSR_IA32_RTIT_ADDR0_A >=
>  				intel_pt_validate_hw_cap(PT_CAP_num_address_ranges) * 2)
>  				continue;

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

-- 
Vitaly