linux-kernel - Re: [PATCH 3/4] KVM: x86/pmu: Reuse find_perf_hw_id() and drop find_fixed

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Message-ID: <3ee8d23b-c7c1-94ab-d625-662072760373@redhat.com>
Date:   Thu, 18 Nov 2021 15:43:36 +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
Subject: Re: [PATCH 3/4] KVM: x86/pmu: Reuse find_perf_hw_id() and drop
 find_fixed_event()

On 11/16/21 13:20, Like Xu wrote:
> +	/* return PERF_COUNT_HW_MAX as AMD doesn't have fixed events */
> +	if (pmc_is_fixed(pmc))
> +		return PERF_COUNT_HW_MAX;
> +

This should have a WARN_ON, since reprogram_fixed_counter will never see 
an enabled fixed counter on AMD.

Paolo