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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