Re: Live Migration of 32-bit Linux guest broken since 2.6.35-rc2

Avi Kivity
2010-06-09T15:17:55Z

On 06/09/2010 06:12 PM, Gleb Natapov wrote:
>
>>> a) i remember that there (have been) are instructions that have a
>>> high virtualization penalty.
>>> are there flags that should better not be offered to a VM?
>>>
>> Not that I know of.
>>
>>
> rdtscp? I think it's always emulated.
>

No, it executes natively. It does increase the msr switching cost since
we need to switch MSR_TSC_AUX in addition.

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