linux-kernel - Re: [PATCH v4 2/4] arm64: Work around Falkor erratum 1003

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Message-ID: <20170201163358.GG8177@arm.com>
Date:   Wed, 1 Feb 2017 16:33:58 +0000
From:   Will Deacon <will.deacon@....com>
To:     Christopher Covington <cov@...eaurora.org>
Cc:     Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
        shankerd@...eaurora.org, timur@...eaurora.org,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        Jon Masters <jcm@...hat.com>,
        Neil Leeder <nleeder@...eaurora.org>,
        Mark Langsdorf <mlangsdo@...hat.com>
Subject: Re: [PATCH v4 2/4] arm64: Work around Falkor erratum 1003

On Wed, Feb 01, 2017 at 11:29:22AM -0500, Christopher Covington wrote:
> On 01/31/2017 12:56 PM, Marc Zyngier wrote:
> > Given that all ARMv8 CPUs can support SW_PAN, it is more likely to be
> > enabled than the ARMv8.1 PAN. I'd vote for supporting the workaround in
> > that case too, and hope that people do enable the HW version.
> 
> Okay, I'll do my best to add support for the SW PAN case. I rebased and
> submitted v6 of the E1009 patch [1] so that it no longer depends on this
> patch landing first, if you all are inclined to pick it up while work on
> this E1003 patch continues.

The alternative is not enabling SW_PAN (at runtime) if this errata is
present, along with a warning stating that hardware-PAN should be
enabled in kconfig instead. Not sure what distributions will make of that
though.

> 1. https://patchwork.kernel.org/patch/9547923/

Yup, I queued that one locally and I'll push to -next tomorrow.

Thanks,

Will