[Bug 222996] FreeBSD 11.1-12 on Hyper-V with PCI Express Pass Through

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222996

--- Comment #35 from Dexuan Cui <decui at microsoft.com> ---
(In reply to Wei Hu from comment #34)
It looks the "bad" MMIO range is from the graphics device, i.e. the legacy PCI
graphics device in a Gen-1 VM, or the UEFI graphics deivce in a Gen-2 VM, or
the synthetic Hyper-V graphics device, and we should make sure the MMIO range
used by the Hyper-V PCIB driver doesn't conflict with the one used by the
related graphics device driver.

In Linux the MMIO range used by the graphics devices is reported by
"screen_info.lfb_base" and "screen_info.lfb_size". I guess FreeBSD should have
something similar, e.g. how does the UEFI graphics device driver in FreeBSD
gets the MMIO range?

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