[Bug 196093] bhyve error "wrmsr to register 0x1a0" with Ubuntu 13.10

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196093

--- Comment #15 from Conrad E. Meyer <cem at freebsd.org> ---
Fwiw, the guest is attempting to configure Enhanced SpeedStep after detecting
the host as SandyBridge{,-E} or IveBridge{,-E}.

We are setting the SS_ENABLE bit and TB_DISABLE bits of IA32_MISC_ENABLE.

Finally, we also write the IA32_PERF_CTL register (haven't gotten that far
in boot yet, don't know if Bhyve handles that or not.

Pretty much all of these should just be ignored rather than trapping, IMO.

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