Re: [Xen-devel] Re: [Qemu-devel] [PATCH 1/7] xen: groundwork for xen support

[Anthony Liguori <anthony@codemonkey.ws>]

Daniel P. Berrange wrote:
> On Mon, Jul 28, 2008 at 04:52:28PM +0200, Gerd Hoffmann wrote:
>   
>>>> +/* xen_machine.c */
>>>> +extern QEMUMachine xenpv_machine;
>>>> +extern QEMUMachine xenfv_machine;
>>>>         
>>> Why does xenfv need its own machine type?
>>>       
>> This is how xen's qemu-dm handles it at the moment and I've decided to
>> do it the same way for simplicity.  I think qemu could also figure it
>> using a hypercall.
>>     
>
> This is something I originally added to QEMU in Xen's tree. The basic
> idea is that the 'xenpv' macjine is a machine which /only/ provides the
> paravirtualized Xen backends drivers. The 'xenfv' machine type is just
> the same as the 'pc' machine type, but with the /addition/ of the Xen
> paravirtualized backends. Perhaps the latter could be thought of as
> more of a 'xenpc' (cf 'pc' and 'isapc') becasue its a variation on the
> regular PC machine type. Annoying that all the acronyms I come up with
> only differ by one letter :-)
>   

Why wouldn't the Xen backends be added by appropriate -net or -drive 
options?  For instance, qemu -drive file=foo.img,if=xen -net nic,model=xen

Regards,

Anthony Liguori

> Daniel
>