linux-kernel - Re: [PATCH] KVM: x86/vPMU: Declare kvm_pmu->reprogram_pmi field using DECLARE

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Date:   Tue, 22 Oct 2019 13:40:04 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Like Xu <like.xu@...ux.intel.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86/vPMU: Declare kvm_pmu->reprogram_pmi field using
 DECLARE_BITMAP

On 21/10/19 12:55, Like Xu wrote:
> Replace the explicit declaration of "u64 reprogram_pmi" with the generic
> macro DECLARE_BITMAP for all possible appropriate number of bits.
> 
> Suggested-by: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Like Xu <like.xu@...ux.intel.com>
> ---
>  arch/x86/include/asm/kvm_host.h |  2 +-
>  arch/x86/kvm/pmu.c              | 15 +++++----------
>  2 files changed, 6 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 50eb430b0ad8..236a876a5a2e 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -469,7 +469,7 @@ struct kvm_pmu {
>  	struct kvm_pmc gp_counters[INTEL_PMC_MAX_GENERIC];
>  	struct kvm_pmc fixed_counters[INTEL_PMC_MAX_FIXED];
>  	struct irq_work irq_work;
> -	u64 reprogram_pmi;
> +	DECLARE_BITMAP(reprogram_pmi, X86_PMC_IDX_MAX);
>  };
>  
>  struct kvm_pmu_ops;
> diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
> index 46875bbd0419..75e8f9fae031 100644
> --- a/arch/x86/kvm/pmu.c
> +++ b/arch/x86/kvm/pmu.c
> @@ -62,8 +62,7 @@ static void kvm_perf_overflow(struct perf_event *perf_event,
>  	struct kvm_pmc *pmc = perf_event->overflow_handler_context;
>  	struct kvm_pmu *pmu = pmc_to_pmu(pmc);
>  
> -	if (!test_and_set_bit(pmc->idx,
> -			      (unsigned long *)&pmu->reprogram_pmi)) {
> +	if (!test_and_set_bit(pmc->idx, pmu->reprogram_pmi)) {
>  		__set_bit(pmc->idx, (unsigned long *)&pmu->global_status);
>  		kvm_make_request(KVM_REQ_PMU, pmc->vcpu);
>  	}
> @@ -76,8 +75,7 @@ static void kvm_perf_overflow_intr(struct perf_event *perf_event,
>  	struct kvm_pmc *pmc = perf_event->overflow_handler_context;
>  	struct kvm_pmu *pmu = pmc_to_pmu(pmc);
>  
> -	if (!test_and_set_bit(pmc->idx,
> -			      (unsigned long *)&pmu->reprogram_pmi)) {
> +	if (!test_and_set_bit(pmc->idx, pmu->reprogram_pmi)) {
>  		__set_bit(pmc->idx, (unsigned long *)&pmu->global_status);
>  		kvm_make_request(KVM_REQ_PMU, pmc->vcpu);
>  
> @@ -137,7 +135,7 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
>  	}
>  
>  	pmc->perf_event = event;
> -	clear_bit(pmc->idx, (unsigned long*)&pmc_to_pmu(pmc)->reprogram_pmi);
> +	clear_bit(pmc->idx, pmc_to_pmu(pmc)->reprogram_pmi);
>  }
>  
>  void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
> @@ -253,16 +251,13 @@ EXPORT_SYMBOL_GPL(reprogram_counter);
>  void kvm_pmu_handle_event(struct kvm_vcpu *vcpu)
>  {
>  	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
> -	u64 bitmask;
>  	int bit;
>  
> -	bitmask = pmu->reprogram_pmi;
> -
> -	for_each_set_bit(bit, (unsigned long *)&bitmask, X86_PMC_IDX_MAX) {
> +	for_each_set_bit(bit, pmu->reprogram_pmi, X86_PMC_IDX_MAX) {
>  		struct kvm_pmc *pmc = kvm_x86_ops->pmu_ops->pmc_idx_to_pmc(pmu, bit);
>  
>  		if (unlikely(!pmc || !pmc->perf_event)) {
> -			clear_bit(bit, (unsigned long *)&pmu->reprogram_pmi);
> +			clear_bit(bit, pmu->reprogram_pmi);
>  			continue;
>  		}
>  
> 

Queued, thanks.

Paolo