linux-kernel - Re: [PATCH v8 00/13] KVM: arm64: PMU: Allow userspace to limit the number of PMCs on vCPU

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Date:   Mon, 23 Oct 2023 10:58:19 -0700
From:   Raghavendra Rao Ananta <rananta@...gle.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Oliver Upton <oliver.upton@...ux.dev>,
        Alexandru Elisei <alexandru.elisei@....com>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Shaoqin Huang <shahuang@...hat.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        Colton Lewis <coltonlewis@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v8 00/13] KVM: arm64: PMU: Allow userspace to limit the
 number of PMCs on vCPU

On Mon, Oct 23, 2023 at 6:09 AM Marc Zyngier <maz@...nel.org> wrote:
>
> On Fri, 20 Oct 2023 22:40:40 +0100,
> Raghavendra Rao Ananta <rananta@...gle.com> wrote:
> >
> > Hello,
> >
> > The goal of this series is to allow userspace to limit the number
> > of PMU event counters on the vCPU.  We need this to support migration
> > across systems that implement different numbers of counters.
>
> [...]
>
> I've gone through the initial patches, and stopped before the tests
> (which I usually can't be bothered to review anyway).
>
> The comments I have a relatively minor and could be applied as fixes
> on top if Oliver can be convinced to do so. Note that patch #4 has an
> attribution issue.
>
> > base-commit: 0a3a1665cbc59ee8d6326aa6c0b4a8d1cd67dda3
>
> maz@...ley-girl:~/hot-poop/arm-platforms$ git describe 0a3a1665cbc59ee8d6326aa6c0b4a8d1cd67dda3
> fatal: 0a3a1665cbc59ee8d6326aa6c0b4a8d1cd67dda3 is neither a commit nor blob
>
> Can you please make an effort to base your postings on a known, stable
> commit? A tagged -rc would be best. but certainly not a random commit.
>
I usually do base on a known -rc. But this series needed a couple of
series from kvmarm/next (mentioned in the original patch), and hence I
rebased on top of them. How do you suggest I handle this in the
future? Rebase to a known -rc on mainline, apply the required series,
and then my series on top?

Thank you.
Raghavendra