Re: [Qemu-devel] cpuid problem in upstream qemu with kvm

[Avi Kivity]

On 01/06/2010 03:49 PM, Anthony Liguori wrote:
> > > I think that's workable but I think there may be some subtle issues 
> > > especially across qemu versions.  Can you give an example of what 
> > > you would expect the output to be?
> >
> > -> { command: query-cpu-capabalities }
> > <- { result: { features: [vm, fpu, lm, sse2, sse3, sssse3, ssssssse3, 
> > sse3.14 ], cache: { ... }, vendor: { .... }, etc. } }
> >
> > Or something.  We'd need similar queries for the number of PCI slots, 
> > for example, so the GUI can tell the user when adding hardware is no 
> > longer an option instead of trying it blindly and returning an error.
>
>
> Yeah, the trick with this is that we don't have such a thing as a bare 
> bones CPU in qemu right now.
>
> So you can't really say -cpu qemu64+vm+fpu+lm....
>
> Because some extra features might sneak in.  What I'm getting at is 
> that we need a way to make the results of this command translate into 
> a -cpu invocation that works reliably across multiple versions of qemu.

Well, we can freeze qemu64 if we wish.  That's still not 100% accurate 
since kvm can remove features from qemu64.

-cpu none,+flags,vendor=foo,cache=bar,ad=nauseum?

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error compiling committee.c: too many arguments to function