On 12/06/2010 03:39 PM, Srivatsa Vaddagiri wrote:
> >Also, just curious how this would work for idle vcpus that use mwait rather > >than hlt. > > We don't expose mwait to the guest (emulating mwait is very expensive). We seem to be queuing an exception upon mwait (EXIT_REASON_MWAIT_INSTRUCTION being handled by a handle_invalid_op()). Does that kill the guest?
It sends a #UD, which tells the guest mwait isn't supported. Usually the guest will fall on its sword at this point, but that's not mandated.
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