linux-kernel - Re: [PATCH v4 00/18] KVM nVHE Hypervisor stack unwinder

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Message-ID: <87h73dz8ko.wl-maz@kernel.org>
Date:   Tue, 19 Jul 2022 11:43:35 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Kalesh Singh <kaleshsingh@...gle.com>
Cc:     mark.rutland@....com, broonie@...nel.org,
        madvenka@...ux.microsoft.com, will@...nel.org, qperret@...gle.com,
        tabba@...gle.com, james.morse@....com, alexandru.elisei@....com,
        suzuki.poulose@....com, catalin.marinas@....com,
        andreyknvl@...il.com, russell.king@...cle.com,
        vincenzo.frascino@....com, mhiramat@...nel.org, ast@...nel.org,
        drjones@...hat.com, wangkefeng.wang@...wei.com, elver@...gle.com,
        keirf@...gle.com, yuzenghui@...wei.com, ardb@...nel.org,
        oupton@...gle.com, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
        android-mm@...gle.com, kernel-team@...roid.com
Subject: Re: [PATCH v4 00/18] KVM nVHE Hypervisor stack unwinder

On Fri, 15 Jul 2022 07:10:09 +0100,
Kalesh Singh <kaleshsingh@...gle.com> wrote:
> 
> Hi all,
> 
> This is v4 of the series adding support for nVHE hypervisor stacktraces;
> and is based on arm64 for-next/stacktrace.
> 
> Thanks all for your feedback on previous revisions. Mark Brown, I
> appreciate your Reviewed-by on the v3, I have dropped the tags in this
> new verision since I think the series has changed quite a bit.
> 
> The previous versions were posted at:
> v3: https://lore.kernel.org/r/20220607165105.639716-1-kaleshsingh@google.com/
> v2: https://lore.kernel.org/r/20220502191222.4192768-1-kaleshsingh@google.com/
> v1: https://lore.kernel.org/r/20220427184716.1949239-1-kaleshsingh@google.com/
> 
> The main updates in this version are to address concerens from Marc on the
> memory usage and reusing the common code by refactoring into a shared header.

Overall, the series looks better. I've pointed out a few things that
need changing, but my overall gripe is around the abuse the
stacktrace/nvhe.h as a dumping ground. A lot of the code there could
be pushed to handle_exit.c (or some other compilation unit).

I've pushed an example of a 10 minutes refactor in my tree
(kvm-arm64/nvhe-stacktrace), and I'm sure these are the lowest hanging
fruits.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.