Avi Kivity wrote:
> On 12/15/2009 09:36 AM, Alexander Graf wrote:
>> On 15.12.2009, at 06:29, Sheng Yang wrote:
>>
>>
>>> We don't support these instructions, but guest can execute them even
>>> if the
>>> feature('monitor') haven't been exposed in CPUID. So we would trap
>>> and inject
>>> a #UD if guest try this way.
>>>
>> Wouldn't it be a lot better to emulate them? I actually have
>> emulation of MONITOR/MWAIT on my todo list for some time, since OSX
>> requires it.
>>
>> Basically what they do is they guarantee that a MONITOR'ed region is
>> on a page boundary, so all we need to do is not map the monitor'ed
>> page to wake up from the mwait.
>>
>
> You'll need to break up large page mappings for this.
Right. Same for PCI device assignment. Breaking up large page mappings
should be a fairly normal operation.
Alex
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