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SubjectRe: A set of "standard" virtual devices?
On Monday 02 April 2007 23:33:01 Jeff Garzik wrote:
> Andi Kleen wrote:
> >> How would that work in the case where virtualized guests don't have a
> >> visible PCI bus, and the virtual environment doesn't pretend to emulate
> >> a PCI bus?
> >
> > If they emulated one with the appropiate device
> > then distribution driver auto probing would just work transparently for them.
> Yes, but, ideally with paravirtualization you should be able to avoid
> the overhead of emulating many major classes of device (storage,
> network, RNG, etc.) by developing a low-overhead passthrough interface
> that does not involve PCI at all.

The implementation wouldn't need to use PCI at all. There wouldn't
even need to be PCI like registers internally. Just a pci device
with an ID somewhere in sysfs. PCI with unique IDs
is just a convenient and well established key into the driver module
collection. Once you have the right driver it can do what it wants.

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