[Qemu-devel] TCG optimizations broke ppc64 target

[Qemu-devel] TCG optimizations broke ppc64 target

[David Gibson]

Commit 22613af4a6d9602001e6d0e7b6d98aa40aa018dc 'Add copy and constant
propagation' seems to break TCG emulation of the ppc64 target, at
least as we use it on the pseries machine.

After this patch, attempting to boot a kernel results in an abort() a
short way into the boot:

/home/dwg/ibm/kvm/qemu/tcg/tcg.c:1646: tcg fatal error
Aborted

I'm not very familiar with TCG - can anyone give me some pointers on
how to get the information necessary to debug this?

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

Re: [Qemu-devel] TCG optimizations broke ppc64 target

[Stefan Weil]

Am 05.08.2011 05:45, schrieb David Gibson:
> Commit 22613af4a6d9602001e6d0e7b6d98aa40aa018dc 'Add copy and constant
> propagation' seems to break TCG emulation of the ppc64 target, at
> least as we use it on the pseries machine.
>
> After this patch, attempting to boot a kernel results in an abort() a
> short way into the boot:
>
> /home/dwg/ibm/kvm/qemu/tcg/tcg.c:1646: tcg fatal error
> Aborted
>
> I'm not very familiar with TCG - can anyone give me some pointers on
> how to get the information necessary to debug this?

The same bug occurs with x86_64-softmmu, mips64el-softmmu
and mips64-softmmu targets.

See this discussion thread for more information:
http://lists.nongnu.org/archive/html/qemu-devel/2011-08/msg00758.html