Comment 30 for bug 886521

Stefan: To be clear, we are talking about domU HVM with PV drivers.

In Precise, the HVM drivers are built in for all flavours. This is logical because at least on domU installs which have an HVM backend (as any cloud will), the PCI unplug mechanism will occur whether or not you have PV driver modules available (i.e. whether 'y', 'm', or 'n') so otherwise you end up with no drivers. So I agree with you, built-in is the way to go for Natty and Oneiric (this is what my patch does).

If the concern about a bigger kernel wins the day, then I would suggest turning off XEN_PLATFORM_PCI (or perhaps XEN support in total) so the kernel will at least boot without PV drivers (i.e. disabling the PCI bridge so the unplug mechanism deliberately fails). But I think built-in is a much better answer.