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

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Date:   Wed, 11 Jul 2018 19:28:30 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
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>,
        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>, Pavel Machek <pavel@....cz>,
        "David H . Gutteridge" <dhgutteridge@...patico.ca>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 00/39 v7] PTI support for x86-32

On Wed, 11 Jul 2018, Linus Torvalds wrote:

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

FWIW we shipped Joerg's 32bit KAISER kernel out to our 32bit users (on old 
product where we still support it) on Apr 25th already (and some issues 
have been identified since then because of that). So it (or its port to 
3.0, to be more precise :p) already did receive some crowd-testing.

-- 
Jiri Kosina
SUSE Labs