[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 #41 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: whu
Date: Thu Jul 30 07:26:12 UTC 2020
New revision: 363689
URL: https://svnweb.freebsd.org/changeset/base/363689

Log:
  Prevent framebuffer mmio space from being allocated to other devices on
HyperV.

  On Gen2 VMs, Hyper-V provides mmio space for framebuffer.
  This mmio address range is not useable for other PCI devices.
  Currently only efifb driver is using this range without reserving
  it from system.
  Therefore, vmbus driver reserves it before any other PCI device
  drivers start to request mmio addresses.

  PR:           222996
  Submitted by: weh at microsoft.com
  Reported by:  dmitry_kuleshov at ukr.net
  Reviewed by:  decui at microsoft.com
  Sponsored by: Microsoft

Changes:
  head/sys/dev/hyperv/vmbus/vmbus.c

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