On Fri, Oct 05, 2007 at 06:36:22PM +0100, David Edmondson wrote:
> On Fri, Oct 05, 2007 at 06:30:48PM +0100, Daniel P. Berrange wrote:
> > > The whole "PV and IOEMU" at the same time makes me uncomfortable,
> > > though it looks to be more problematic with disks than network
> > > devices.
> >
> > The key is that the Dom0 configuration of the guest should allow the
> > guest kernel to choose the drivers.
>
> Understood.
>
> > Obviously you don't want both drivers active at once, so one idea is
> > for the PV drivers to 'grab' the PCI resources associated with the
> > emulated NIC.
>
> That seems so wrong.
>
> In Solaris drivers are loaded as a result of a mapping from the PCI ID
> of the device to a driver name (I've no idea if it's the same in
> Linux). What happens if the RTL8139 driver gets in first?
If the PV driver is unable to grab the PCI resources of the RTL NIC
because RTL8139 is already loaded, then it wouldn't try to initialize
the PV nic. So this basically provides the safety net against both
being active (accidentally or by delibrate admuin actions). Then you
need to figure out a way to prioritization the driver you really want.
Dan.
--
|=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=|
|=- Perl modules: http://search.cpan.org/~danberr/ -=|
|=- Projects: http://freshmeat.net/~danielpb/ -=|
|=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=|
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
Home