On Tue, 12 Jul 2011 04:59:33 +0900
Grant Likely [off-list ref] wrote:

However, compatible values are cheap and while theoretically any
hypervisor could create a similar machine, the reality is probably
subtle difference between the implementations.  I'd rather see the
compatible reflect the specific implementation.

That's what the hypervisor node is for.  We have a tree, let's use it. :-)

-Scott