Re: [PATCH 4/4] x86: properly handle kvm emulation of hyperv

H. Peter Anvin
2013-07-24T04:48:28Z

On 07/23/2013 09:37 PM, Jason Wang wrote:
> On 07/23/2013 10:48 PM, H. Peter Anvin wrote:
>> On 07/23/2013 06:55 AM, KY Srinivasan wrote:
>>> This strategy of hypervisor detection based on some detection order IMHO is not
>>> a robust detection strategy. The current scheme works since the only hypervisor emulated
>>> (by other hypervisors happens to be Hyper-V). What if this were to change.
>>>
>> One strategy would be to pick the *last* one in the CPUID list, since
>> the ones before it are logically the one(s) being emulated...
>>
>> -hpa
>>
>
> How about simply does a reverse loop from 0x40010000 to 0x40010000?
>

Not all systems like being poked too far into hyperspace. Just remember
the last match and walk the list.

-hpa