linux-kernel - Re: [PATCH kvm/queue v2 1/3] KVM: x86/pmu: Replace pmu->available_event

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Date:   Tue, 1 Feb 2022 13:26:02 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Like Xu <like.xu.linux@...il.com>,
        Jim Mattson <jmattson@...gle.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Like Xu <likexu@...cent.com>
Subject: Re: [PATCH kvm/queue v2 1/3] KVM: x86/pmu: Replace
 pmu->available_event_types with a new BITMAP

On 1/17/22 09:53, Like Xu wrote:
> +/* Mapping between CPUID 0x0A.EBX bit vector and enum perf_hw_id. */
> +static inline int map_unavail_bit_to_perf_hw_id(int bit)
> +{
> +	switch (bit) {
> +	case 0:
> +	case 1:
> +		return bit;
> +	case 2:
> +		return PERF_COUNT_HW_BUS_CYCLES;
> +	case 3:
> +	case 4:
> +	case 5:
> +	case 6:
> +		return --bit;
> +	}
> +
> +	return PERF_COUNT_HW_MAX;
> +}
> +

Please use an array here (e.g. cpuid_event_to_perf_hw_id_map[]).

Paolo