linux-kernel - Re: [PATCH] KVM: x86/vPMU: reset pmc->counter to 0 for pmu fixed

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Date:   Wed, 17 Jul 2019 12:23:27 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Like Xu <like.xu@...ux.intel.com>
Cc:     wehuang@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86/vPMU: reset pmc->counter to 0 for pmu
 fixed_counters

On 17/07/19 04:51, Like Xu wrote:
> To avoid semantic inconsistency, the fixed_counters in Intel vPMU
> need to be reset to 0 in intel_pmu_reset() as gp_counters does.
> 
> Signed-off-by: Like Xu <like.xu@...ux.intel.com>
> ---
>  arch/x86/kvm/vmx/pmu_intel.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
> index 68d231d49c7a..4dea0e0e7e39 100644
> --- a/arch/x86/kvm/vmx/pmu_intel.c
> +++ b/arch/x86/kvm/vmx/pmu_intel.c
> @@ -337,17 +337,22 @@ static void intel_pmu_init(struct kvm_vcpu *vcpu)
>  static void intel_pmu_reset(struct kvm_vcpu *vcpu)
>  {
>  	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
> +	struct kvm_pmc *pmc = NULL;
>  	int i;
>  
>  	for (i = 0; i < INTEL_PMC_MAX_GENERIC; i++) {
> -		struct kvm_pmc *pmc = &pmu->gp_counters[i];
> +		pmc = &pmu->gp_counters[i];
>  
>  		pmc_stop_counter(pmc);
>  		pmc->counter = pmc->eventsel = 0;
>  	}
>  
> -	for (i = 0; i < INTEL_PMC_MAX_FIXED; i++)
> -		pmc_stop_counter(&pmu->fixed_counters[i]);
> +	for (i = 0; i < INTEL_PMC_MAX_FIXED; i++) {
> +		pmc = &pmu->fixed_counters[i];
> +
> +		pmc_stop_counter(pmc);
> +		pmc->counter = 0;
> +	}
>  
>  	pmu->fixed_ctr_ctrl = pmu->global_ctrl = pmu->global_status =
>  		pmu->global_ovf_ctrl = 0;
> 

Queued, thanks.

Paolo