linux-kernel - RE: [PATCH v8 00/14] Guest LBR Enabling

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Message-ID: <286AC319A985734F985F78AFA26841F73E3F9B0D@shsmsx102.ccr.corp.intel.com>
Date:   Fri, 31 Jan 2020 01:01:56 +0000
From:   "Wang, Wei W" <wei.w.wang@...el.com>
To:     Eduardo Habkost <ehabkost@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "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>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Jiri Olsa <jolsa@...hat.com>
Subject: RE: [PATCH v8 00/14] Guest LBR Enabling

On Friday, January 31, 2020 4:14 AM, Eduardo Habkost wrote:
> On Tue, Aug 06, 2019 at 03:16:00PM +0800, Wei Wang wrote:
> > Last Branch Recording (LBR) is a performance monitor unit (PMU)
> > feature on Intel CPUs that captures branch related info. This patch
> > series enables this feature to KVM guests.
> >
> > Each guest can be configured to expose this LBR feature to the guest
> > via userspace setting the enabling param in KVM_CAP_X86_GUEST_LBR
> (patch 3).
> 
> Are QEMU patches for enabling KVM_CAP_X86_GUEST_LBR being planned?
> 
Yes, we have a couple of qemu patches. That's planned to be reviewed after the kernel part gets finalized 😊

Best,
Wei