Re: [Qemu-devel] Qemu s390x emulation

[Rob Landley <rob@landley.net>]

On 01/15/2013 05:45:44 AM, Alexander Graf wrote:
> 
> On 15.01.2013, at 12:39, Suzuki K. Poulose wrote:
> 
> > On 01/15/2013 04:39 PM, Alexander Graf wrote:
> >>
> >> On 15.01.2013, at 12:05, Suzuki K. Poulose wrote:
> >>
> >>> Hi
> >>>
> >>> I have been trying to setup a qemu session for qemu-system-s390x  
> (on
> >>> x86_64) using a kernel (with initramfs built-in the kernel)  
> without a
> >>> disk image. The kernel was built with s390 defconfig + disabled  
> loadable
> >>> modules (just to keep everything inside the kernel).
> >>>
> >>> $ qemu-system-s390x -M s390 -kernel vmlinux -m 1024
> >>>
> >>>
> >>> The session dies in say 2 secs, with an exit code of 0. I  
> searched for
> >>> some hints / success stories, couldn't find any.
> >>>
> >>> Am I doing something wrong here ? Please let me know the right  
> procedure
> >>> for getting this up and running.
> >>
> >> S390 boots using an "image" file. Please try -kernel <kernel  
> dir>/arch/s390/boot/image.
> >>
> > Tried that even, but not any better. btw, moved to the upstream git  
> for qemu.
> >
> > 0
> > $/data/src/qemu/s390x-softmmu/qemu-system-s390x  -m 1024 -kernel  
> ./image -nographic
> > $echo $?
> > 0
> > $file ./image
> > ./image: Linux S390
> >
> > $ cd /data/src/qemu/ ; git log | head -n1
> > commit cf7c3f0cb5a7129f57fa9e69d410d6a05031988c
> 
> Does this one work for you?
> 
> http://ftp.nl.debian.org/debian/dists/stable/main/installer-s390/current/images/generic/kernel.debian

I tried grabbing that and grabbing the initrd image in the same  
directory, booting them with:

qemu-system-s390x -kernel kernel.debian -nographic -m 1024 -initrd  
initrd.debian \
  -append "rdinit=/bin/ash"

And it booted to a shell prompt... with a broken console. When I did  
"ls -l" at the resulting prompt it echoed back an ANSI escape sequence,  
one character at a time, which looks like the response to the ansi  
screen size probe busybox does (to query the display size of an xterm  
across a virtual serial console).

I.E. qemu is getting deeply confused that what comes from stdin and  
what you type on the keyboard aren't quite the same thing. Some kind of  
strange ncurses hackage, looks like?

I tried sticking "cat |" in front of the above qemu pipeline and it got  
REALLY confused.

Rob