On Tue, Mar 13, 2018 at 08:45:19AM +0000, David Woodhouse wrote:

On Tue, 2018-03-13 at 09:16 +0100, Christoph Hellwig wrote:

quoted

On Tue, Mar 13, 2018 at 08:12:52AM +0000, David Woodhouse wrote:

quoted

I'd also *really* like to see a way to enable this for PFs which don't
have (and don't need) a driver. We seem to have lost that along the
way.

We've been forth and back on that.  I agree that not having any driver
just seems dangerous.  If your PF really does nothing we should just
have a trivial pf_stub driver that does nothing but wiring up
pci_sriov_configure_simple.  We can then add PCI IDs to it either
statically, or using the dynamic ids mechanism.

Or just add it to the existing pci-stub. What's the point in having a
new driver? 

Because binding to pci-stub means that you'd now enable the simple
SR-IOV for any device bound to PCI stub.  Which often might be the wrong
thing.