Re: [PATCH][KVM][retry 3] Add support for Pause Filtering to AMDSVM

[Avi Kivity]

Peter Zijlstra wrote:

 

> > It's a fully virtualized guest.  There's no way to get this without 
> > patching the guest kernel.
> >     
>
> Yes there is.. virtualized monitor-wait stuff coupled with a
> monitor-wait based spinlock implementation.
>   

That only works if the guest uses monitor/mwait.  Not all of the guests 
are under our control.  I don't know whether Windows uses 
monitor/mwait.  Further, we don't have timed exits on mwait like we do 
with pause.

I've also heard that monitor/mwait are very slow and only usable on idle 
loop stuff.

> Once we go change silicon, you might as well do it right.
>   

None of the major x86 vendors are under my control.

--
error compiling committee.c: too many arguments to function

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