Re: How can I help?

[Chris Stromblad <chris.stromblad-yx4YqRIVDag@public.gmane.org>]

Few years ago I did a fair bit of x86 programming, but with the more
recent CPUs and all the new instructions, I'd probably be bit out of it.
Then again, wouldn't hurt having a look at it... who knows, maybe in a
few years I could actually do something ;)

The problem.

Basically I get the problem immediately when attempting to boot from an
ISO image (the installation step). The image is a UBUNTU x86_64
installation disk. Pretty much instantly when I attempt to boot the
window flashes by and in the original window I get the CPU reg dump with
the exception 12.

It works when using the unmodified version of QEMU.

/ Chris

On Sun, 2007-02-25 at 07:25 +0200, Avi Kivity wrote:
> Chris Stromblad wrote:
> > Hi there,
> >
> > Just wanted to introduce myself to the list and also ask a few
> > questions. My name is Chris, currently living in the UK, nerd by day and
> > even more so at night.
> >
> > Today I thought about playing with KVM for the first time, but without
> > much luck. Reading the archives I noticed someone else was experiencing
> > the same problem, it's the "exception 12" problem in qemu/kvm.
> >
> > While I am an okay C-programmer, I've got little experience with
> > kernel-development but would be happy to learn or assist in anyway I
> > can.
> >
> >   
> 
> Unfortunately hacking on the code requires much poring over ancient 
> manuscripts, a thorough understanding of the glorious history of the x86 
> architecture, and much banging of heads against walls.  So unless you're 
> prepared to spend quite a bit of time on kvm, your best bet is in testing.
> 
> Having a regression test of a real workload with timing measurements 
> always helps, prefereably with multiple virtual machines running 
> concurrently.
> 
> 
> > I'm currently working on an Intel Core 2 CPU, with Archlinux as choice
> > of distribution. If there is anything I can do to help, please let me
> > know!
> >
> > / Chris
> >
> > PS: Ops, almost forgot. Are there any solutions for the "exception 12"
> > problem, or something I can do?
> >
> >   
> 
> What guest are you running?  At what stage are you seeing the problem?  
> Usually the workaround involves disabling the bootloader splashscreen or 
> switching bootloaders.
> 



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