RE: [Xen-devel] [RFC] Disable xen platform device when it is not needed.

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> Thank you for your comments.
> 
> On Wed, 18 Feb 2009 11:29:54 +1100
> "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:
> 
> > >
> > > I plan to create the patch to disable xen platform device when it
> > > is not needed. Please let me know if anyone has a comment.
> > >
> > > Windows guest shows xen platform device as unknown
> > > device with "!" mark in the device manager, when PV drivers are
not
> > > loaded. So I'd like to disable xen platform device.
> > >
> > > If following conditions are all true, I will disable xen platform
> > > device. Otherwise, xen platform device will be enabled.
> > >
> > >     - All entries in "disk" parameter have "ioemu:" prefix in DEV
> > field.
> > >         Example:
> > >         disk = [ '/var/images/guest.img,ioemu:hda,w',
> > ',ioemu:hdc:cdrom,r'
> > > ]
> > >
> > >     - All entries in "vif" parameter have "type=ioemu".
> > >         Example:
> > >         vif = [ 'type=ioemu, bridge=eth0', 'type=ioemu,
bridge=eth1' ]
> > >
> > >     - "vscsi" parameter is not specified.
> >
> > I still leave my disks and network as ioemu even when using PV
drivers,
> > as I simply need to use the /NOGPLPV boot option to switch back to
them.
> 
> When "ioemu:" or "type=ioemu" are not specified, both emulated device
> and PV device are enabled. This is current xen's behavior.
> 
> So my idea does not break your usage.

Maybe I don't understand your idea, but I think you are saying that if
ioemu is specified then the PV drivers won't work because you will
disable the platform pci device.

James


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