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From:   Mark D Rustad <mrustad@gmail.com>
Message-Id: <6FB16384-7597-474E-91A1-1AF09201CEAC@gmail.com>
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Subject: Re: [PATCH 00/31 v2] PTI support for x86_32
Date:   Sun, 11 Feb 2018 09:40:41 -0800
In-Reply-To: <20180211105909.53bv5q363u7jgrsc@angband.pl>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Joerg Roedel <jroedel@suse.de>,
        Andy Lutomirski <luto@kernel.org>,
        Joerg Roedel <joro@8bytes.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        "H . Peter Anvin" <hpa@zytor.com>, X86 ML <x86@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux-MM <linux-mm@kvack.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Juergen Gross <jgross@suse.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Borislav Petkov <bp@alien8.de>, Jiri Kosina <jkosina@suse.cz>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Brian Gerst <brgerst@gmail.com>,
        David Laight <David.Laight@aculab.com>,
        Denys Vlasenko <dvlasenk@redhat.com>,
        Eduardo Valentin <eduval@amazon.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        Will Deacon <will.deacon@arm.com>,
        "Liguori, Anthony" <aliguori@amazon.com>,
        Daniel Gruss <daniel.gruss@iaik.tugraz.at>,
        Hugh Dickins <hughd@google.com>,
        Kees Cook <keescook@google.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Waiman Long <llong@redhat.com>, Pavel Machek <pavel@ucw.cz>
To:     Adam Borowski <kilobyte@angband.pl>
References: <1518168340-9392-1-git-send-email-joro@8bytes.org>
 <CALCETrUF61fqjXKG=kwf83JWpw=kgL16UvKowezDVwVA1=YVAw@mail.gmail.com>
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> On Feb 11, 2018, at 2:59 AM, Adam Borowski <kilobyte@angband.pl> =
wrote:
>=20
>> Does Debian make it easy to upgrade to a 64-bit kernel if you have a
>> 32-bit install?
>=20
> 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.

--
Mark Rustad, MRustad@gmail.com


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