Re: [Qemu-devel] qemu-system-s390x command line

["Richard W.M. Jones" <rjones@redhat.com>]

On Mon, Aug 31, 2015 at 07:09:34PM +0200, Thomas Huth wrote:
> On 30/08/15 23:27, Richard W.M. Jones wrote:
> > On Sun, Aug 30, 2015 at 11:02:17PM +0200, Alexander Graf wrote:
> >>
> >>
> >>> Am 30.08.2015 um 22:11 schrieb Richard W.M. Jones <rjones@redhat.com>:
> >>>
> >>> Hi Alex,
> >>>
> >>> Do you or anyone have a working qemu-system-s390x command line I can
> >>> use as a starting point to boot a [TCG] guest?
> >>>
> >>> So far I have tried variations of:
> >>>
> >>> ~/d/qemu/s390x-softmmu/qemu-system-s390x -M s390-ccw-virtio -m 1024 -smp 1 -drive file=s390x.img,if=none,id=disk0 -device virtio-blk-ccw,drive=disk0,id=hd0,bootindex=1 -drive file=Fedora-Server-DVD-s390x-22.iso
> >>
> >> Ok, 2 problems here. I'm not sure the iso is bootable - you are
> >> definitely best off to just use -kernel until you have sonething
> >> working and then move on to booting without. CD boot is something
> >> real mainframes don't do very often, so it's a pretty unmaintained
> >> code path in installation media.
> >>
> >> The other one is that we emulate most fancy new user level
> >> instructions of an ec12, but we only advertise ourselves as a z9 to
> >> the kernel. So you need to make sure that your kernel is compiled
> >> with support for old CPUs (RHEL7 for example is not).
> > 
> > Thanks Alex.  Stripping this back to the basics:
> > 
> >   ~/d/qemu/s390x-softmmu/qemu-system-s390x -M s390-ccw-virtio -m 1024 -smp 1 -kernel kernel.img
> > 
> > with the kernel.img downloaded from
> > 
> >   http://mirrors.nic.cz/fedora-secondary/releases/22/Server/s390x/os/images/
> > 
> > just opens a window for a fraction of a second and then qemu exits.
> > 
> > I'm not married to that particular kernel, nor even to Fedora.  I just
> > want to get something that works as a starting point.  Is there a SUSE
> > or Debian kernel which boots?
> 
> Either try http://www.qemu-advent-calendar.org/#day-22 or the following:
> 
>  wget http://ftp.nl.debian.org/debian/dists/Debian8.1/main/installer-s390x/current/images/generic/initrd.debian
>  wget http://ftp.nl.debian.org/debian/dists/Debian8.1/main/installer-s390x/current/images/generic/kernel.debian
> 
> Then:
> 
>  qemu-system-s390x -M s390-ccw-virtio -kernel kernel.debian -initrd initrd.debian -m 512 -nographic

That works well, thanks!

Rich.

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