[Xen-devel] Re: [Xen-ia64-devel] PCI backend and slot functions

[Alex Williamson <alex.williamson@xxxxxx>]

On Wed, 2006-08-02 at 15:12 +0200, Tristan Gingold wrote:
> Hi,
> 
> Currently PCI slot functions are not virtualized.  When I hide 0000:06:01.1 
> it 
> appears as 0000:00:00.1 and there is no function 0 for the slot.  This is an 
> issue because on linux/ia64, functions > 0 are not probed if there is no 
> function 0.
> 
> How is it handled on x86 ?
> 
> Should I add an option to virtualize slot functions ?

   Yes, I think so.  The ia64 PCI discovery appears to more closely
follow the PCI spec.  Both multi-function and single-function PCI
devices must have configuration space at function 0.  I would guess x86
may probe all functions to deal with old, buggy hardware.

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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