Feedback: PCI device spec

[Pawel Moll <pawel.moll@arm.com>]

Greetings,

A colleague of mine, implementing a virtio PCI device now, asked me to
pass some feedback on his behalf (a trick to avoid legals & IPR :-)

P. 6.1. "Configuration Space Organization" of the "PCI Local Bus
Specification, REV. 3.0" (page 215) states that "All PCI compliant
devices must support the [..] Class Code" and the WD01 does not define
what class should it be.

I had a look at the spec and appendix D. "Class Codes" defines "00h
Device was built before Class Code definitions were finalized" and a
brief look at Linux kernel shows that it would work. At the same time
native KVM tools use "01h Mass storage controller" with
subclass/interface "80h 00h Other mass storage controller" which
probably makes sense.

I'm far from being any kind of PCI expert, so the question is: Should
the spec clarify this matter? Maybe a table in the PCI chapter showing
virtio ID -> PCI class?

Paweł