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

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Message-Id: <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net>
Date:   Sun, 11 Feb 2018 11:42:47 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Mark D Rustad <mrustad@...il.com>
Cc:     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>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH 00/31 v2] PTI support for x86_32



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.
> 

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