linux-kernel - Re: [PATCH] KVM: VMX: Micro-optimize vmexit time when not exposing PMU

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Message-ID: <CALMp9eTSBpaPYKE6toPCbSfCQGhM9M4=1Z1FFBGQ9Bm_pKSpuQ@mail.gmail.com>
Date:   Thu, 12 Mar 2020 09:21:56 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Wanpeng Li <kernellwp@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH] KVM: VMX: Micro-optimize vmexit time when not exposing PMU

On Thu, Mar 12, 2020 at 3:36 AM Vitaly Kuznetsov <vkuznets@...hat.com> wrote:

> Also, speaking about cloud providers and the 'micro' nature of this
> optimization, would it rather make sense to introduce a static branch
> (the policy to disable vPMU is likely to be host wide, right)?

Speaking for a cloud provider, no, the policy is not likely to be host-wide.