On Thu, Sep 18, 2014 at 12:07 PM, Andy Lutomirski <[email protected]> wrote:

> Might Intel be willing to extend that range to 0x40000000 -
> 0x400fffff?  And would Microsoft be okay with using this mechanism for
> discovery?

So, for CPUID, the SDM (Table 3-17. Information Returned by CPUID) says today:
"No existing or future CPU will return processor identification or
feature information if the initial EAX value is in the range 40000000H
to 4FFFFFFFH."

We can define a cross-VM CPUID range from there. The CPUID can return
the index of the MSR if needed.

-- 
Jun
Intel Open Source Technology Center
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