[Bug 235010] bhyve: Linux guest crash due to unhandled MSR

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235010

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: cem
Date: Fri Jan 18 23:54:51 UTC 2019
New revision: 343166
URL: https://svnweb.freebsd.org/changeset/base/343166

Log:
  vmm(4): Mask Spectre feature bits on AMD hosts

  For parity with Intel hosts, which already mask out the CPUID feature
  bits that indicate the presence of the SPEC_CTRL MSR, do the same on
  AMD.

  Eventually we may want to have a better support story for guests, but
  for now, limit the damage of incorrectly indicating an MSR we do not yet
  support.

  Eventually, we may want a generic CPUID override system for
  administrators, or for minimum supported feature set in heterogenous
  environments with failover.  That is a much larger scope effort than
  this bug fix.

  PR:           235010
  Reported by:  Rys Sommefeldt <rys AT sommefeldt.com>
  Sponsored by: Dell EMC Isilon

Changes:
  head/sys/amd64/vmm/x86.c

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