Re: Standardizing an MSR or other hypercall to get an RNG seed?

Nakajima, Jun
2014-09-18T21:21:39Z

On Thu, Sep 18, 2014 at 12:07 PM, Andy Lutomirski <luto@amacapital.net> 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