Re: [Qemu-devel] [Qemu-ppc] [PATCH 1/1] Support ppc64le binfmt registration

[Serge E. Hallyn]

Quoting Alexander Graf (address@hidden):
> 
> 
> On 27.08.14 23:35, Peter Maydell wrote:
> > On 27 August 2014 22:30, Alexander Graf <address@hidden> wrote:
> >>
> >>
> >> On 27.08.14 21:01, Peter Maydell wrote:
> >>> [adding qemu-ppc]
> >>>
> >>> On 27 August 2014 19:45, Serge E. Hallyn <address@hidden> wrote:
> >>>> Quoting Peter Maydell (address@hidden):
> >>>>> On 27 August 2014 18:55, Serge E. Hallyn <address@hidden> 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.