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

[Thomas Huth <huth@tuxfamily.org>]

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

Hope that helps,
  Thomas