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

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Message-ID: <20190405160351.5l4wbmool5m4rkua@treble>
Date:   Fri, 5 Apr 2019 11:03:51 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Will Deacon <will.deacon@....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

On Fri, Apr 05, 2019 at 03:44:14PM +0100, Will Deacon wrote:
> 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.

Thanks for the heads up Will.  I will drop the arm64 patch for now then.

-- 
Josh