( We should double check that rdmsr()/wrmsr() results are never left
uninitialized, but are set to zero or so, for cases where the return code is not
checked. )
It sure looks like native_read_msr_safe doesn't clear the output if
the rdmsr fails.
I'd suggest to return some poison not just 0...
less likely to get interesting surprises that are insane hard to debug/diagnose
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