linux-kernel - Re: [PATCH v2 5/5] arm64/speculation: Support 'mitigations=' cmdline option

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Message-ID: <20190416213920.GC11724@brain-police>
Date:   Tue, 16 Apr 2019 22:39:21 +0100
From:   Will Deacon <will.deacon@....com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, 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>,
        Randy Dunlap <rdunlap@...radead.org>,
        Steven Price <steven.price@....com>,
        Phil Auld <pauld@...hat.com>
Subject: Re: [PATCH v2 5/5] arm64/speculation: Support 'mitigations=' cmdline
 option

On Tue, Apr 16, 2019 at 09:26:13PM +0200, Thomas Gleixner wrote:
> On Fri, 12 Apr 2019, Josh Poimboeuf wrote:
> 
> > Configure arm64 runtime CPU speculation bug mitigations in accordance
> > with the 'mitigations=' cmdline option.  This affects Meltdown, Spectre
> > v2, and Speculative Store Bypass.
> > 
> > The default behavior is unchanged.
> > 
> > Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> > ---
> > NOTE: This is based on top of Jeremy Linton's patches:
> >       https://lkml.kernel.org/r/20190410231237.52506-1-jeremy.linton@arm.com
> 
> So I keep that out and we have to revisit that once the ARM64 stuff hits a
> tree, right? I can have a branch with just the 4 first patches applied
> which ARM64 folks can pull in when they apply Jeremy's patches before te
> merge window.

Yes, that would work for us, cheers. I should get to Jeremy's latest version
next week and I'm certainly planning to get them queued up for 5.2.

Will