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

[Michael S. Tsirkin]

On Sun, Dec 20, 2009 at 05:59:33PM +0200, Avi Kivity wrote:
> 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).

Hmm, then, shouldn't either kvm or qemu mask features that we do not
emulate well enough to make windows not crash?


> -- 
> error compiling committee.c: too many arguments to function