Avi Kivity wrote:
> On 06/15/2009 12:09 PM, Mark McLoughlin wrote:
>>>>> I think the point is that you don't need version numbers if you 
>>>>> have a
>>>>> proper device tree.
>>>>>
>>>>>          
>>>> How do you add a new attribute to the device tree and, when a supplied
>>>> device tree lacking said attribute, distinguish between a device tree
>>>> from an old version of qemu (i.e. use the old default) and a partial
>>>> device tree from the VM manager (i.e. use the new default) ?
>>>>
>>>>        
>>> -baseline 0.10
>>>      
>>
>> That's a version number :-)
>>
>> (I was responding to Anthony's "you don't need a version number")
>>    
>
> If you want to prevent incompatibilities, you need to make everything 
> new (potentially including bugfixes) non-default.  Eventually the 
> default configuration becomes increasingly unusable and you need a new 
> baseline.  You must still be able to fall back to the old baseline for 
> older guests.  I don't think games with configuration files can hide 
> that.

-M pc1
-M pc2

etc.

This is pretty easy to maintain with config files.

Regards,

Anthony Liguori


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