linux-kernel - Re: [PATCH RFC 5/5] arm64/speculation: Add support for 'cpu_spec

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Message-ID: <20190405144414.GB7662@fuggles.cambridge.arm.com>
Date:   Fri, 5 Apr 2019 15:44:14 +0100
From:   Will Deacon <will.deacon@....com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Kosina <jikos@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jon Masters <jcm@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-s390@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tyler Hicks <tyhicks@...onical.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH RFC 5/5] arm64/speculation: Add support for
 'cpu_spec_mitigations=' cmdline options

Hi Josh,

On Thu, Apr 04, 2019 at 11:44:15AM -0500, Josh Poimboeuf wrote:
> Configure arm64 runtime CPU speculation bug mitigations in accordance
> with the 'cpu_spec_mitigations=' cmdline options.  This affects
> Meltdown and Speculative Store Bypass.
> 
> The default behavior is unchanged.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 2 ++
>  arch/arm64/kernel/cpu_errata.c                  | 4 ++++
>  arch/arm64/kernel/cpufeature.c                  | 6 ++++++
>  3 files changed, 12 insertions(+)

Just wanted to make you aware that this is probably going to conflict badly
with some patches we have pending to hook up the sysfs entries:

http://lists.infradead.org/pipermail/linux-arm-kernel/2019-March/640326.html

That patch series isn't quite there yet, so I'm expecting a v7, but I think
it will change the shape of this patch quite a lot.

Will