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

[H. Peter Anvin]

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

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