> I'll have to recheck how Linux handles these

JFYI I was in correspondence with the cpuid utility team lately, and they told 
me that Linux uses vendor-specific MSRs to pull that info out:

> Check out:
> 
>    MSR_IA32_UCODE_REV
>    MSR_AMD64_PATCH_LEVEL
> 
> Both reference MSR 0x8b.

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