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SubjectRe: [RFC] CPUID usage for interaction between Hypervisors and Linux.
Anthony Liguori wrote:
> Mmm, cpuid bikeshedding :-)

My shade of blue is better.

>> The space 0x40000000-0x400000ff is reserved for hypervisor usage.
>>
>> This region is divided into 16 16-leaf blocks. Each block has the
>> structure:
>>
>> 0x400000x0:
>> eax: max used leaf within the leaf block (max 0x400000xf)
>
> Why even bother with this? It doesn't seem necessary in your proposal.

It allows someone to incrementally add things to their block in a fairly
orderly way. But more importantly, its the prevailing idiom, and the
existing and proposed cpuid schemes already do this, so they'd fit in as-is.

J


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