linux-kernel - Re: [PATCH 00/39 v7] PTI support for x86-32

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Date:   Wed, 11 Jul 2018 23:07:02 +0200
From:   Pavel Machek <pavel@....cz>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jürgen 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 Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>,
        Hugh Dickins <hughd@...gle.com>,
        Kees Cook <keescook@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>,
        "David H . Gutteridge" <dhgutteridge@...patico.ca>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 00/39 v7] PTI support for x86-32

On Wed 2018-07-11 09:28:39, Linus Torvalds wrote:
> On Wed, Jul 11, 2018 at 4:30 AM Joerg Roedel <joro@...tes.org> wrote:
> >
> > I did the load-testing again with 'perf top', the ldt_gdt
> > self-test and a kernel-compile running in a loop again.
> 
> So none of the patches looked scary to me, but then, neither did
> earlier versions.
> 
> It's the testing that worries me most. Pretty much no developers run
> 32-bit any more, and I'd be most worried about the odd interactions
> that might be hw-specific. Some crazy EFI mapping setup or the similar
> odd case that simply requires a particular configuration or setup.

I tested previous version of the series, and I keep testing -next on
thinkpad X60 every week or so. I try to test every major release on
T40p.

> But I guess those issues will never be found until we just spring this
> all on the unsuspecting public.

Sounds like a plan. Testing gets easier once patch reaches -next or
mainline...

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

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