linux-kernel - Re: [PATCH RFC 1/5] cpu/speculation: Add 'cpu_spec

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Message-ID: <87bm1cufbm.fsf@concordia.ellerman.id.au>
Date:   Fri, 12 Apr 2019 12:29:01 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        x86@...nel.org, Ingo Molnar <mingo@...nel.org>,
        "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>,
        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>,
        Will Deacon <will.deacon@....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 1/5] cpu/speculation: Add 'cpu_spec_mitigations=' cmdline options

Thomas Gleixner <tglx@...utronix.de> writes:
> On Wed, 10 Apr 2019, Michael Ellerman wrote:
>> Josh Poimboeuf <jpoimboe@...hat.com> writes:
>> 
>> > On Fri, Apr 05, 2019 at 06:01:36PM +0200, Borislav Petkov wrote:
>> >> Thinking about this more, we can shave off the first 4 chars and have it
>> >> be:
>> >> 
>> >> spec_mitigations=
>> >> 
>> >> I think it is painfully clear which speculation mitigations we mean. And
>> >> the other switches don't have "cpu_" prefixes too so...
>> >
>> > Sure, I'm ok with renaming it to that, if there are no objections.
>> 
>> What about when we have a mitigation for a non-speculation related bug :)
>
> Those kind of silicon bugs are usually mitigated unconditionally.

I guess that's true, usually :)

cheers