linux-kernel - Re: [RFC PATCH 00/16] PTI support for x86-32

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Date:   Fri, 26 Jan 2018 13:36:16 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Alan Cox <gnomes@...rguk.ukuu.org.uk>
Cc:     Nadav Amit <nadav.amit@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>, aliguori@...zon.com,
        daniel.gruss@...k.tugraz.at, hughd@...gle.com, keescook@...gle.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>, jroedel@...e.de
Subject: Re: [RFC PATCH 00/16] PTI support for x86-32

Hi Alan,

On Thu, Jan 25, 2018 at 05:09:25PM +0000, Alan Cox wrote:
> On Mon, 22 Jan 2018 09:56:25 +0100
> Joerg Roedel <joro@...tes.org> wrote:
> 
> > Hey Nadav,
> > 
> > On Sun, Jan 21, 2018 at 03:46:24PM -0800, Nadav Amit wrote:
> > > It does seem that segmentation provides sufficient protection from Meltdown.  
> > 
> > Thanks for testing this, if this turns out to be true for all affected
> > uarchs it would be a great and better way of protection than enabling
> > PTI.
> > 
> > But I'd like an official statement from Intel on that one, as their
> > recommended fix is still to use PTI.
> 
> It is: we don't think segmentation works on all processors as a defence.

Thanks for checking and the official statement. So the official
mitigation recommendation is still to use PTI.


Regards,

	Joerg