linux-kernel - Re: [PATCH RFC 3/5] powerpc/speculation: Add support for 'cpu_spec

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Message-ID: <401506569.4710878.1554408064001.JavaMail.zimbra@raptorengineeringinc.com>
Date:   Thu, 4 Apr 2019 15:01:04 -0500 (CDT)
From:   Timothy Pearson <tpearson@...torengineering.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        "H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        linux-s390@...r.kernel.org, x86@...nel.org,
        Will Deacon <will.deacon@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Waiman Long <longman@...hat.com>, linux-arch@...r.kernel.org,
        Jon Masters <jcm@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Tyler Hicks <tyhicks@...onical.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH RFC 3/5] powerpc/speculation: Add support for
 'cpu_spec_mitigations=' cmdline options

Will be joining in ~ 5 mins.  Getting Chromium set up here.

----- Original Message -----
> From: "Jiri Kosina" <jikos@...nel.org>
> To: "Josh Poimboeuf" <jpoimboe@...hat.com>
> Cc: "Peter Zijlstra" <peterz@...radead.org>, "Heiko Carstens" <heiko.carstens@...ibm.com>, "Paul Mackerras"
> <paulus@...ba.org>, "H . Peter Anvin" <hpa@...or.com>, "Ingo Molnar" <mingo@...nel.org>, "Andrea Arcangeli"
> <aarcange@...hat.com>, linux-s390@...r.kernel.org, x86@...nel.org, "Will Deacon" <will.deacon@....com>, "Linus
> Torvalds" <torvalds@...ux-foundation.org>, "Catalin Marinas" <catalin.marinas@....com>, "Waiman Long"
> <longman@...hat.com>, linux-arch@...r.kernel.org, "Jon Masters" <jcm@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
> "Andy Lutomirski" <luto@...nel.org>, "Thomas Gleixner" <tglx@...utronix.de>, linux-arm-kernel@...ts.infradead.org,
> "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org, "Tyler Hicks" <tyhicks@...onical.com>,
> "Martin Schwidefsky" <schwidefsky@...ibm.com>, linuxppc-dev@...ts.ozlabs.org
> Sent: Thursday, April 4, 2019 2:49:05 PM
> Subject: Re: [PATCH RFC 3/5] powerpc/speculation: Add support for 'cpu_spec_mitigations=' cmdline options

> On Thu, 4 Apr 2019, Josh Poimboeuf wrote:
> 
>> Configure powerpc CPU runtime speculation bug mitigations in accordance
>> with the 'cpu_spec_mitigations=' cmdline options.  This affects
>> Meltdown, Spectre v1, Spectre v2, and Speculative Store Bypass.
> [ ... snip ... ]
>> -	if (!no_nospec)
>> +	if (!no_nospec && cpu_spec_mitigations != CPU_SPEC_MITIGATIONS_OFF)
> 
> '!no_nospec' is something that I am sure will come back to hunt me in my
> bad dreams.
> 
> But that's been there already, and fixing it is out of scope of this
> patch. Other than that, as discussed previously -- I really like this new
> global option. Feel free to add
> 
>	Reviewed-by: Jiri Kosina <jkosina@...e.cz>
> 
> for the whole set.
> 
> Thanks,
> 
> --
> Jiri Kosina
> SUSE Labs