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

[Alexander Graf]

> Am 30.08.2015 um 23:27 schrieb Richard W.M. Jones <address@hidden>:
> 
>> 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 <address@hidden>:
>>> 
>>> 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.

So the guest ran and initiated an exit. Btw, you probably want -nographic.

> 
> 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?

Phew, SLES11 SP4 should work. SLES12 has the same problem as RHEL7. I assume 
Debian may also work, but I haven't tried in quite some time :).

Alex