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

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

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 :-)

Daniel
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