On 03/12/2012 01:01 PM, Eric W. Biederman wrote:
>
> The basic problem is which source do we block this at? How many
> sources are their? And architecturally last I looked x86 no longer
> has a NMI disable EFI and similar systems want to get away without
> a CMOS legacy clock because designers so often get them wrong.
>
On all processors which have an LAPIC you can block all NMI sources at
the LAPIC. I think it's safe to assume that if you don't have an LAPIC
-- an ancient system by now -- you have port 70h.
-hpa
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