From: Paolo Bonzini <pbonzini@redhat.com>
To: Like Xu <like.xu@linux.intel.com>, kvm@vger.kernel.org
Cc: peterz@infradead.org, Jim Mattson <jmattson@google.com>,
rkrcmar@redhat.com, sean.j.christopherson@intel.com,
vkuznets@redhat.com, Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
ak@linux.intel.com, wei.w.wang@intel.com, kan.liang@intel.com,
like.xu@intel.com, ehankland@google.com, arbel.moshe@oracle.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 4/4] KVM: x86/vPMU: Add lazy mechanism to release perf_event per vPMC
Date: Mon, 21 Oct 2019 17:28:31 +0200 [thread overview]
Message-ID: <2175c2cd-2c1e-22e8-2f67-3fc334ef2a40@redhat.com> (raw)
In-Reply-To: <c2979d05-4536-e3b5-e2f6-3e6740c1a82d@linux.intel.com>
On 21/10/19 16:04, Like Xu wrote:
>
>>
>> 2) introduce a new callback msr_idx_to_pmc that returns a struct
>> kvm_pmc*, and change kvm_pmu_is_valid_msr to do
>
> For callback msr_idx_to_pmc,
> how do we deal with the input 'MSR_CORE_PERF_FIXED_CTR_CTRL'
> which may return several fixed kvm_pmcs not just one?
For RDMSR, do not do anything. For WRMSR, you can handle it in the
set_msr callback.
>>
>> static int kvm_pmu_mark_pmc_in_use(struct kvm_vcpu *vcpu, u32 msr)
>
> s/static int/static void/.
>
>> {
>> struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
>> struct kvm_pmc *pmc = kvm_x86_ops->pmu_ops->msr_idx_to_pmc(vcpu, msr);
>
> We need 'if(pmc)' here.
Agreed, sorry for the sloppiness. Never interpret my suggestions as
more than pseudocode. :)
Paolo
next prev parent reply other threads:[~2019-10-21 15:28 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-13 9:15 [PATCH v2 0/4] KVM: x86/vPMU: Efficiency optimization by reusing last created perf_event Like Xu
2019-10-13 9:15 ` [PATCH v2 1/4] perf/core: Provide a kernel-internal interface to recalibrate event period Like Xu
2019-10-13 9:15 ` [PATCH v2 2/4] perf/core: Provide a kernel-internal interface to pause perf_event Like Xu
2019-10-14 11:51 ` Peter Zijlstra
2019-10-15 1:47 ` Like Xu
2019-10-13 9:15 ` [PATCH v2 3/4] KVM: x86/vPMU: Reuse perf_event to avoid unnecessary pmc_reprogram_counter Like Xu
2019-10-21 8:12 ` Paolo Bonzini
2019-10-21 8:16 ` Like Xu
2019-10-13 9:15 ` [PATCH v2 4/4] KVM: x86/vPMU: Add lazy mechanism to release perf_event per vPMC Like Xu
2019-10-21 8:45 ` Paolo Bonzini
2019-10-21 14:04 ` Like Xu
2019-10-21 15:28 ` Paolo Bonzini [this message]
2019-10-21 10:55 ` [PATCH] KVM: x86/vPMU: Declare kvm_pmu->reprogram_pmi field using DECLARE_BITMAP Like Xu
2019-10-22 11:40 ` Paolo Bonzini
2019-10-21 2:26 ` [PATCH v2 0/4] KVM: x86/vPMU: Efficiency optimization by reusing last created perf_event Like Xu
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