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 <20180110233252.GA14739@amd>
From: Olivier Galibert <galibert@pobox.com>
Date: Thu, 11 Jan 2018 12:29:41 +0100
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Subject: Re: Linux 4.15-rc7
To: Pavel Machek <pavel@ucw.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        jikos@suse.cz
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Wasn't/Isn't the 4G/4G  memory layout for 32 bits essentially KPTI?

  OG.


On Thu, Jan 11, 2018 at 12:32 AM, Pavel Machek <pavel@ucw.cz> wrote:
> Hi!
>
>> The one thing I want to do now that Meltdown and Spectre are public,
>> is to give a *big* shout-out to the x86 people, and Thomas Gleixner in
>> particular for really being on top of this.  It's been one huge
>> annoyance, and honestly, Thomas really went over and beyond in this
>> whole mess.  A lot of other people have obviously been involved too,
>
> As I understand it: KPTI prevents Meltdown attack on x86-64, but
> Spectre means even x86-64 is not expected to be safe?
>
> Ok, so Meltdown is public... And I still have some nice 32-bit
> machines I'd like to keep working.
>
> Proof of concept is out, https://github.com/IAIK/meltdown/ .
>
> Is anyone working on KPTI for x86-32? SLES11 should still be
> supported, and that should have x86-32 version; any chance SUSE can
> share some patches?
>
> Thanks,
>                                                                         Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html