[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 #17 from Peter Grehan <grehan at FreeBSD.org> ---
I guess Speedstep being disabled in CPUID isn't enough for some o/s versions :(

Shouldn't be too hard to ignore those bits in MISC_ENABLE and sink the writes
to PERF_CTL and ENERGY_PERF_BIAS. Would you be able to test out a patch ?

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