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SubjectRe: Use CPUID to communicate with the hypervisor.
Nakajima, Jun wrote:
> 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?
>
>

Features that the guest needs to enable very early on, before ACPI is
up. I don't think there are many of those.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.



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