RE: Use CPUID to communicate with the hypervisor.

[Nakajima, Jun]

On 9/29/2008 12:37:23 AM, Avi Kivity wrote:
> Gleb Natapov wrote:
> > Can this interface be used to pass variable sized data from a
> > hypervisor to a gust? ACPI or DMI tables for instance.
> >
>
> In theory it can, but it would be a bad idea.  cpuid is best used to
> communicate cpu features; ACPI and DMI are (mostly) system features.

Also, we have reserved the MSRs from 0x40000000 - 0x400000FF for software use. We could use such MSRs, but what's the benefits of using those when ACPI already defined the detection mechanism?

             .
Jun Nakajima | Intel Open Source Technology Center
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