Re: [RFC] kvm-s390: userspace snapshot

[Oliver Paukstadt <pstadt@sourcentral.org>]

On Fri, 2008-06-06 at 17:54 +0200, Carsten Otte wrote:
> This patch is a full snapshot of "kuli", our current userspace for
> kvm.
> It is <3000 lines of code, and it contains a bootloader as well as
> virtio backeds for console, network, and block. It's command line
> syntax
> is same as the common kvm userspace, but not all options are
> supported.
> See --help for details.
> Our next step will be to get rid of the guest phys == user virt
> address
> mapping, so that we can have the guest memory anywhere on a megabyte
> boundary in userland. After that, we'd like to integrate this into the
> common kvm userspace, it is not intended for customer production use
> but
> is a good starting point to explore what kvm can look alike on s390.
> 
> Have fun reading 
I started playing around with the stuff.

I was able to get a running host kernel based on yesterdays kvm.git +
Christian's VIRTIO_BLK_F_BLK_SIZE patch + Frank's latest qeth fixes.

I decided to use the same kernel/initrd for my first guest system and
expected the kernel to run at least through initial setup code, but
there was an unexpected intercept:

init_logging: KULI logging initialized
do_ipl: perparing for IPL
get_pages: map guest memory at 0x10000000 (pfn: 65536)
get_pages: map guest memory at 0x10001000 (pfn: 65537)
get_pages: map guest memory at 0x10003000 (pfn: 65539)
get_pages: map guest memory at 0x10005000 (pfn: 65541)
load_ipl: Booting from kernel image file
"image-2.6.26-rc5kvm-20080609-01433-gdf4245d-dirty"
load_from_files: loading ramdisk file
initrd-2.6.26-rc5kvm-20080609-01433-gdf4245d-dirty at 800000
load_from_files: loading kernel parameter file parmfile
do_ipl: IPL from address 10000
launch_cpu_ipl: starting guest (ipl)
run_cpu: cpu 0: activated, running work...
handle_should_not_happen: PANIC:cpu 0 caught unexpected intercept. Magic
number: 0x20

Did I miss anything, like setting up virtual consoles, addressing mode
or is there another kernel option for guests I did not see?
Documentation is a little short, any hint appreciated ;-)
I did this test running the host system as guest in z/VM 5.3 on z900, is
this "supported"?

Regards,
Oliver