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 <rjo...@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? > Once you get past these points, things should be very > self-explanatory. Oh - and -kernel is 0 overhead on s390x, unlike > x86. Heh heh :-) Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top
