linux-kernel - Re: [PATCH] x86/speculation: Add document to describe Spectre and its mitigations

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Message-ID: <20190114130153.GC21544@amd>
Date:   Mon, 14 Jan 2019 14:01:54 +0100
From:   Pavel Machek <pavel@....cz>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jon Masters <jcm@...hat.com>,
        Waiman Long <longman9394@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        x86@...nel.org, stable@...r.kernel.org
Subject: Re: [PATCH] x86/speculation: Add document to describe Spectre and
 its mitigations

On Mon 2019-01-14 13:06:24, Jiri Kosina wrote:
> On Mon, 14 Jan 2019, Pavel Machek wrote:
> 
> > > > That one really is Intel-specific (not even all x86s are affectd). Same 
> > > > for Meltdown.
> > > 
> > > At least for Meltdown, your claim is simply not correct.
> > 
> > You are right, there may be few ARM chips affected by meltdown.
> 
> And some of the powerpc64s as well.

Do you mean this?

https://lkml.org/lkml/2018/1/8/649

Frankly I'd not call it Meltdown, as it works only on data in the
cache, so the defense is completely different. Seems more like a l1tf
:-).

									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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