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

[Avi Kivity]

On 12/20/2009 05:51 PM, Michael S. Tsirkin wrote:
> > Maybe we should make -cpu host the default.  That will give the best
> > performance for casual users, more testing for newer features, and will
> > force management apps to treat migration much more seriously.  The
> > downside is that casual users upgrading their machines might experience
> > issues with Windows.  Feature compatibility is not just about migration.
> >      
> This seems very aggressive.  Can't we whitelist features that we know
> about?  Further, doesn't KVM already do this?
>
>    

It does, but without -cpuid host you're stuck with qemu64 (kvm.ko 
doesn't add features userspace didn't request).

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