linux-kernel - Re: [PATCH v12 00/11] Guest Last Branch Recording Enabling

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Date:   Thu, 2 Jul 2020 15:58:42 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
Cc:     Like Xu <like.xu@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, ak@...ux.intel.com,
        wei.w.wang@...el.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, "Liang, Kan" <kan.liang@...el.com>
Subject: Re: [PATCH v12 00/11] Guest Last Branch Recording Enabling

On Thu, Jul 02, 2020 at 09:11:06AM -0400, Liang, Kan wrote:
> On 7/2/2020 3:40 AM, Peter Zijlstra wrote:
> > On Sat, Jun 13, 2020 at 04:09:45PM +0800, Like Xu wrote:
> > > Like Xu (10):
> > >    perf/x86/core: Refactor hw->idx checks and cleanup
> > >    perf/x86/lbr: Add interface to get LBR information
> > >    perf/x86: Add constraint to create guest LBR event without hw counter
> > >    perf/x86: Keep LBR records unchanged in host context for guest usage
> > 
> > > Wei Wang (1):
> > >    perf/x86: Fix variable types for LBR registers
> > 
> > >   arch/x86/events/core.c            |  26 +--
> > >   arch/x86/events/intel/core.c      | 109 ++++++++-----
> > >   arch/x86/events/intel/lbr.c       |  51 +++++-
> > >   arch/x86/events/perf_event.h      |   8 +-
> > >   arch/x86/include/asm/perf_event.h |  34 +++-
> > 
> > These look good to me; but at the same time Kan is sending me
> > Architectural LBR patches.
> > 
> > Kan, if I take these perf patches and stick them in a tip/perf/vlbr
> > topic branch, can you rebase the arch lbr stuff on top, or is there
> > anything in the arch-lbr series that badly conflicts with this work?
> > 
> 
> Yes, I can rebase the arch lbr patches on top of them.
> Please push the tip/perf/vlbr branch, so I can pull and rebase my patches.

For now I have:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/vlbr

Once the 0day robot comes back all-green, I'll push it out to
tip/perf/vlbr and merge it into tip/perf/core.

Thanks!