[Xen-devel] multi-function devices on vPCI bus

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

Hi, Ryan,
        A question here. Why does multi-function devices need special 
handle on vPCI mode for pcibe/pcife? vPCI mode is just to provide 
a full-virtualized PCI hierarchy which already virtualizes busnr/slotnr,

and there's no need to special case the function number. If some rare
driver really has assumption about the multi-function knowledge 
about one specific device, just go to "passthrough" mode.

        Actually there's even no need to keep a third mode ("slot")
which
makes nothing difference but to provide a virtual function number. We 
may keep things simple:
        - passthrough to provide real hierarchy, except adding more root

buses
        - vPCI to provide virtual hierarchy, with vbus/vslot/vfunction 
which have no relationship with real.

        Does it sound OK? :-)

Thanks,
Kevins

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