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

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

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

Rodney W. Grimes <[hidden email]> changed:

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--- Comment #4 from Rodney W. Grimes <[hidden email]> ---
(In reply to Conrad Meyer from comment #2)
Your correct in that bhyve does very little to hide CPUID bits of the host from
the guest and this has caused us these types of problems.  This only gets worse
with the addition of mitigation bits.

What we need is a general mechanism to deal with this that would allow both
masking and setting of any of the CPUID bits, something along the lines of
(HOST & mask) | force for each of the cpuid values.

This would even give us the ability to change processor model and type.

IIRC this is how vmware implements the "create least common denominator" CPUid
accross a cluster of servers so that you can do live migration.

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