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From: Ivan Voras <ivoras@freebsd.org>
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Cc: freebsd-hackers@freebsd.org, Sergey Babkin <babkin@verizon.net>
Subject: Re: Patch for MS Hyper V (virtualization)
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2009/4/6 John Baldwin <jhb@freebsd.org>:
> On Sunday 05 April 2009 12:23:39 pm Sergey Babkin wrote:

> Hmm, the problem is we need to be able to write to BARs to size them. =C2=
=A0Any OS
> needs to be able to do this to know what address space regions are being
> decoded by devices. =C2=A0We can't avoid writing to BARs.

I have only vague idea what BARs are and if it's the correct diagnosis
in this case, but the fact is that other operating systems (Windows,
Linux tested) work, so either there is a way around it or the original
premise is wrong-ish.