linux-kernel - Re: [PATCH] KVM: x86/pmu: Zero out pmu->all_valid_pmc

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Message-ID: <168073781051.657542.2486795284440545503.b4-ty@google.com>
Date:   Wed,  5 Apr 2023 16:59:32 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Like Xu <like.xu.linux@...il.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86/pmu: Zero out pmu->all_valid_pmc_idx each time
 it's refreshed

On Tue, 04 Apr 2023 15:17:59 +0800, Like Xu wrote:
> The kvm_pmu_refresh() may be called repeatedly (e.g. configure guest
> CPUID repeatedly or update MSR_IA32_PERF_CAPABILITIES) and each
> call will use the last pmu->all_valid_pmc_idx value, with the residual
> bits introducing additional overhead later in the vPMU emulation.
> 
> 

Applied to kvm-x86 pmu, thanks!

[1/1] KVM: x86/pmu: Zero out pmu->all_valid_pmc_idx each time it's refreshed
      https://github.com/kvm-x86/linux/commit/7e768ce8278b

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes