[Xen-devel] [DOM0 KERNELS] pciback: Fix SR-IOV VF passthrough

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

Vendor/device and BAR fields in a VF's host-level PCI config space are dummy
and must always be virtualised/emulated. Implement this in pciback by always
extracting the values installed in dom0 kernel's own PCI structures, rather
than interrogating the underlying PCI config space directly.

AFAIK, this patch should apply to any kernel that implements pciback: That
includes pv_ops, SLES, and the XS/XCP kernels. It should be applied to all
of them. It is already applied to linux-2.6.18-xen.hg as 998:693c40564c8d.

Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>

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