[Bug 250802] bhyve exited with status 134 when GPU PCI passthrough

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250802

--- Comment #55 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: kib
Date: Thu Nov 12 00:46:53 UTC 2020
New revision: 367606
URL: https://svnweb.freebsd.org/changeset/base/367606

Log:
  bhyve: avoid allocating BARs above the end of supported physical addresses.

  Read CPUID leaf 0x8000008 to determine max supported phys address and
  create BAR region right below it, reserving 1/4 of the supported guest
  physical address space to the 64bit BARs mappings.

  PR:    250802 (although the issue from PR is not fixed by the change)
  Noted and reviewed by:        grehan
  Sponsored by: The FreeBSD Foundation
  MFC after:    2 weeks
  Differential revision:        https://reviews.freebsd.org/D27095

Changes:
  head/usr.sbin/bhyve/pci_emul.c

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