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Date: Wed, 07 Oct 2009 18:28:20 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] Re: [PATCH v2 9/9] Add -kvm option
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To: Glauber Costa <glommer@redhat.com>
Cc: Andre Przywara <andre.przywara@amd.com>, Anthony Liguori <aliguori@us.ibm.com>, qemu-devel@nongnu.org, Gerd Hoffmann <kraxel@redhat.com>

Glauber Costa wrote:
> On Wed, Oct 07, 2009 at 06:00:34PM -0500, Anthony Liguori wrote:
>   
>> Glauber Costa wrote:
>>     
>>> This option deprecates --enable-kvm. It is a more flexible option,
>>> that makes use of qemu-opts, and allow us to pass on options to enable or
>>> disable kernel irqchip, for example.
>>>   
>>>       
>> With proper qdev support, you could select kvm device models based on  
>> -device so I think this option isn't all that useful.
>>
>> What I'd like to see in the interim is a kvm specific machine type  
>> that's defaulted to if kvm is enabled.  I think this would be useful not  
>> only for enabling things like in-kernel apic, but also for selecting a  
>> default cpu model.
>>     
> I don't really follow.
>
> even if we have qdev on the irq controllers, one could still come up with
> situations in which we'd like to force the use of one device over another.
>   

Right, my assumption is that the devices will have different qdev names 
and therefore a user can select which one gets used.

Right now, -device is just additive.  I'm not sure the best way to 
express something like, replace this existing device with this new 
device.  Maybe some trickery with id=.  Gerd, any thoughts?

Regards,

Anthony Liguori