linux-kernel - Re: [PATCH 1/2] arm64: smp: Fix pseudo NMI issues w/ broken Mediatek FW

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Message-ID: <864jj4njb7.wl-maz@kernel.org>
Date:   Fri, 06 Oct 2023 11:20:44 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Doug Anderson <dianders@...omium.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Valentin Schneider <vschneid@...hat.com>,
        Chen-Yu Tsai <wenst@...omium.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        D Scott Phillips <scott@...amperecomputing.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Misono Tomohiro <misono.tomohiro@...itsu.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] arm64: smp: Fix pseudo NMI issues w/ broken Mediatek FW

On Thu, 05 Oct 2023 11:27:26 +0100,
Mark Rutland <mark.rutland@....com> wrote:

> 3) Partial fix: make the ARM64_HAS_GIC_PRIO_MASKING cpucap depend on the
>    absence of a "mediatek,broken-save-restore-fw" property in the DT. I believe
>    we can check that in early_enable_pseudo_nmi() or can_use_gic_priorities().
> 
>    That'll avoid potential issues if/when we change the priorities used for
>    pNMI (which is something I've been looking at).
> 
> I'm happy with (3) if Marc is.

Definitely worth investigating if you have the bandwidth.

	M.

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