Peter Grehan fcbec69157 Respect and track the enable bit in the PCI configuration address word.
Ignore writes, and return 0xff's, on config accesses when not set.
Behaviour now matches that seen on h/w.

Found with a NetBSD/amd64 guest.

Reviewed by:	tychon
MFC after:	3 weeks
2014-04-25 17:35:34 +00:00
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