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

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

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Closed
         Resolution|---                         |FIXED

--- Comment #6 from Conrad Meyer <cem at freebsd.org> ---
Thanks for the report and MSR access log, Rys!  I think I found the reason this
works on Intel (the CPUID feature bits where SPEC_CTRL would be indicated are
cleared) and not AMD (on AMD, we pass through those feature bits from the
host).  Both Intel and AMD share the same SPEC_CRTL MSR and we do not implement
it on either platform.  Please try the committed change, I believe it should
fix the issue.

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