From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:38242)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <serge@mail.hallyn.com>) id 1XMmHS-0008W3-63
	for qemu-devel@nongnu.org; Wed, 27 Aug 2014 19:05:34 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <serge@mail.hallyn.com>) id 1XMmHO-0003lv-3d
	for qemu-devel@nongnu.org; Wed, 27 Aug 2014 19:05:30 -0400
Date: Thu, 28 Aug 2014 01:05:24 +0200
From: "Serge E. Hallyn" <serge@hallyn.com>
Message-ID: <20140827230524.GA28935@mail.hallyn.com>
References: <20140827175556.GA24631@mail.hallyn.com>
	<CAFEAcA9JFLFRvy_R_sdgwp=ayRcuCDs8hULiDO4JuqaJiab=bA@mail.gmail.com>
	<20140827184557.GB24631@mail.hallyn.com>
	<CAFEAcA_E0_vbX_kbNL=vzVeG01ZbEh2tAjSeBMOzcoD0Oo1kiQ@mail.gmail.com>
	<53FE4E13.1060803@suse.de>
	<CAFEAcA-bCc9Ka9KR8Cj8fw9zsmeb+69E_Kx8EXEpgpikvO_oDw@mail.gmail.com>
	<53FE5E44.1070900@suse.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <53FE5E44.1070900@suse.de>
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH 1/1] Support ppc64le binfmt
 registration
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Alexander Graf <agraf@suse.de>
Cc: Peter Maydell <peter.maydell@linaro.org>, Benjamin Herrenschmidt <benh@au1.ibm.com>, "qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>, QEMU Developers <qemu-devel@nongnu.org>, "Serge E. Hallyn" <serge@hallyn.com>

Quoting Alexander Graf (agraf@suse.de):
> 
> 
> On 27.08.14 23:35, Peter Maydell wrote:
> > On 27 August 2014 22:30, Alexander Graf <agraf@suse.de> wrote:
> >>
> >>
> >> On 27.08.14 21:01, Peter Maydell wrote:
> >>> [adding qemu-ppc]
> >>>
> >>> On 27 August 2014 19:45, Serge E. Hallyn <serge@hallyn.com> wrote:
> >>>> Quoting Peter Maydell (peter.maydell@linaro.org):
> >>>>> On 27 August 2014 18:55, Serge E. Hallyn <serge@hallyn.com> wrote:
> >>>>>> This is a part of a patch proposed by jaejunh at
> >>>>>> https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1358268
> >>>>>> which enables running ppc64le binaries through qemu-user.
> >>>>>
> >>>>> I'm confused -- wouldn't these be handled by the existing
> >>>>> "ppc64le" support?
> >>>
> >>>> It looks to me like the point was to add a TARGET_ABI32=y
> >>>> version (and I dunno, something about CONFIG_LIBDECNUMBER=y
> >>>> for 32-bit).
> >>>
> >>> Wouldn't that be a "ppc64leabi32" target?
> >>
> >> There is no LE support for 32bit on PPC :).
> > 
> > ...in that case what is the original bug reporter actually
> > asking for?
> 
> Not sure - the only thing that remotely resembles what he's describing
> would be if you enable the 32bit personality:
> 
>   $ /uname-a.sh
>   Linux tempranillo 3.17.0-rc1-2-default+ #1 SMP Thu Jan 1 01:04:00 CET
>   1970 ppc64le ppc64le ppc64le GNU/Linux
> 
>   $ perl -e 'syscall(136, 8); exec "/uname-a.sh"'
>   Linux tempranillo 3.17.0-rc1-2-default+ #1 SMP Thu Jan 1 01:04:00 CET
>   1970 ppcle ppcle ppcle GNU/Linux
> 
> but that doesn't mean that there is an actual ABI change. The ABI is
> still ppc64le, as all binaries are still running in 64bit mode.
> 
> So before we add anything to QEMU, I would like to first see someone
> point me to kernel patches that actually enable LE on Linux for 32bit
> user space. So far I'm not aware of any (and I doubt it makes much sense).

Thanks, guys, I'll ping him for that.