[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 #20 from Dexuan Cui <decui at microsoft.com> ---
(In reply to Wei Hu from comment #19)
> For the broken of PCI passthrough, I have not checked in fix yet.
> I think we can just reserve the MMIO address (0xf8000000, 0xf8800000)
FWIW, we can not hardcode the MMIO range that should be reserved, because the
range's base address can change if the user sets the Low MMIO space size by
something like "Set-VM -LowMemoryMappedIoSpace 3Gb -VMName $vm" (See
https://docs.microsoft.com/en-us/windows-server/virtualization/hyper-v/plan/plan-for-deploying-devices-using-discrete-device-assignment).

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