Re: [Qemu-devel] [PATCH 3/3] S390: Enable -cpu help and QMP query-cpu-definitions

[Alexander Graf]

On 12/12/2012 06:52 PM, Richard Henderson wrote:
> On 12/12/2012 06:03 AM, Alexander Graf wrote:
> > The TCG model is a "z900". We can just have a "z900" model and a
> > "host" model with tcg_enabled() vs kvm_enabled() checks on each.
> My target-s390x tcg rewrite targets something just shy of z196.
>
> The main thing that's missing is actually STORE FACILITY LIST EXTENDED.
> Which I always assumed would go along with a re-vamp of the cpu model,
> just as we're considering here, so that we could in fact emulate z900
> or anything in between.

Yes, and it's definitely something we need to do. I'm just concerned 
about timing. Do we want to hold back a bug fix (libvirt can break with 
empty cpu lists) for a feature (proper cpu list for tcg targets)?

I'd say let's make the -cpu host target work and whoever gets around to 
it first can implement cpu models, store facility list extended, and tcg 
feature masks.


Alex