I have noticed that Windows 10 guests fail to boot when attempting to pass
through a network card. I believe I have observed this with both cxgbe
(t580) and mlx5en cards, but only have a cxgbe to test with now. Without
passthrough, the Windows 10 guest boots and operates normally.

FreeBSD guests (12.0-RELEASE) have no issue when booting with the cxgbe
card passed through - I can kldload cxgbe and I get both cxl ports showing
up in the FreeBSD guest.

I have tested this with both 12.0-RELEASE and head (13-CURRENT r347883) as
the host OS with no change in behavior. The bhyve output is:
Unhandled ps2 keyboard command 0x02
Unhandled ps2 keyboard command 0x02
Assertion failed: (error == 0), function modify_bar_registration, file
/usr/src/usr.sbin/bhyve/pci_emul.c, line 504.
fbuf frame buffer base: 0x943600000 [sz 16777216]

Two main suggestions from discussions at BSDCan this week were:
- Capture pciconf -lvb from the FreeBSD guest
- Add some printf to pci_emul.c to capture some values when there is an
error

I've captured the above, and a lot of other relevant info, in a Google Doc
here (too big to post directly):
https://docs.google.com/document/d/1t-UVIO9Aq0TPUFHyo1nVscqaW1LoPuNhfLPitL8oeTs/edit?usp=sharing

`nap
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