linux-kernel - Re: 32-bit PTI with THP = userspace corruption

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Message-ID: <20181022205603.GA13595@amd>
Date:   Mon, 22 Oct 2018 22:56:03 +0200
From:   Pavel Machek <pavel@....cz>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Meelis Roos <mroos@...ux.ee>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        linux-mm@...ck.org, Andrea Arcangeli <aarcange@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: 32-bit PTI with THP = userspace corruption

On Mon 2018-10-22 09:56:42, Joerg Roedel wrote:
> On Sun, Oct 21, 2018 at 02:37:45PM +0200, Pavel Machek wrote:
> > On Tue 2018-09-18 14:00:30, Alan Cox wrote:
> > > There are pretty much no machines that don't support PAE and are still
> > > even vaguely able to boot a modern Linux kernel. The oddity is the
> > > Pentium-M but most distros shipped a hack to use PAE on the Pentium M
> > > anyway as it seems to work fine.
> > 
> > I do have some AMD Geode here, in form of subnotebook. Definitely
> > newer then Pentium Ms, but no PAE...
> 
> Are the AMD Geode chips affected by Meltdown?

Probably not.

I'm not saying this has meltdown/spectre etc. I'm just saying there
are relatively new machines without PAE.

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

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