Hi, John and all,
        I updated the blueprint 
https://blueprints.launchpad.net/nova/+spec/pci-extra-info-icehouse  according 
to your feedback, to add the backward compatibility/upgrade issue/examples.

        I try to separate this BP with the SR-IOV NIC support as a standalone 
enhancement, because this requirement is more a generic PCI pass through 
feature, and will benefit other usage scenario as well.

        And the reasons that I want to finish this BP in I release are:

        a) it's a generic requirement, and push it into I release is helpful to 
other scenario.
        b) I don't see upgrade issue, and the only thing will be discarded in 
future is the PCI alias if we all agree to use PCI flavor. But that effort will 
be small and there is no conclusion to PCI flavor yet.
        c) SR-IOV NIC support is complex, it will be really helpful if we can 
keep ball rolling and push the all-agreed items forward. 

        Considering the big patch list for I-3 release, I'm not optimistic to 
merge this in I release, but as said, we should keep the ball rolling and move 
forward.

Thanks
--jyh

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