linux-kernel - Re: [PATCH 00/31 v2] PTI support for x86

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Date:   Sun, 11 Feb 2018 23:34:18 +0100
From:   Pavel Machek <pavel@....cz>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Mark D Rustad <mrustad@...il.com>,
        Adam Borowski <kilobyte@...band.pl>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.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>,
        "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>
Subject: Re: [PATCH 00/31 v2] PTI support for x86_32

On Sun 2018-02-11 11:42:47, Andy Lutomirski wrote:
> 
> 
> On Feb 11, 2018, at 9:40 AM, Mark D Rustad <mrustad@...il.com> wrote:
> 
> >> On Feb 11, 2018, at 2:59 AM, Adam Borowski <kilobyte@...band.pl> wrote:
> >> 
> >>> Does Debian make it easy to upgrade to a 64-bit kernel if you have a
> >>> 32-bit install?
> >> 
> >> Quite easy, yeah.  Crossgrading userspace is not for the faint of the heart,
> >> but changing just the kernel is fine.
> > 
> > ISTR that iscsi doesn't work when running a 64-bit kernel with a 32-bit userspace. I remember someone offered kernel patches to fix it, but I think they were rejected. I haven't messed with that stuff in many years, so perhaps the userspace side now has accommodation for it. It might be something to check on.
> > 

It might make sense to retry those patches... if we want people to
move to 64bit kernels, it makes sense to provide complete emulation
for 32bit distros...

> At the risk of suggesting heresy, should we consider removing x86_32
> support at some point?

Heresy!

We still support 486s. I don't know if anyone really uses them, but
T40p is an acceptable machine to ssh from. X60 is still the machine I
prefer for traveling. Fast enough if you don't compile, and nicer
keyboard/screen than X220...

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