linux-kernel - RE: [PATCH v4 10/10] KVM/x86/lbr: lazy save the guest lbr stack II

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Date:   Sat, 29 Dec 2018 04:25:12 +0000
From:   "Wang, Wei W" <wei.w.wang@...el.com>
To:     'Andi Kleen' <ak@...ux.intel.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Liang, Kan" <kan.liang@...el.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "Xu, Like" <like.xu@...el.com>,
        "jannh@...gle.com" <jannh@...gle.com>,
        "arei.gonglei@...wei.com" <arei.gonglei@...wei.com>
Subject: RE: [PATCH v4 10/10] KVM/x86/lbr: lazy save the guest lbr stack II

On Friday, December 28, 2018 4:53 AM, Andi Kleen wrote:
> Actually forgot one case.
> 
> In Arch Perfmon v4 the LBR freezing is also controlled through a
> GLOBAL_CTRL bit.
> I didn't see any code handling that bit?

That GLOBAL_STATUS.LBR_FRZ bit hasn't been supported yet. I'll add that, thanks.

Best,
Wei