Re: [Xen-devel] Re: [Xen-changelog] [xen-3.1-testing] xend: fix server/netif.py so that it respects type=None.

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

On Fri, Oct 05, 2007 at 05:16:35PM +0100, David Edmondson wrote:
> On Fri, Oct 05, 2007 at 05:06:56PM +0100, Daniel P. Berrange wrote:
> > That would certainly work for Linux, though it would not enable the
> > HVM guests on a Solaris host to be configured with both PV drivers &
> > QEMU at the same time. Upto solaris guys if that's a good enough
> > solution...
> 
> We'll make 'None' mean 'our preferred default' in our implementation.
> 
> 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. 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. So once you load the PV driver, there's 
no way for the RTL8139 driver to get access to the NIC, thus ensuring only
one is ever active at once. The same principle applies to disk adapters.

Regards,
Dan.
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