Re: Remaining passthrough/VT-d tasks list

["Yang, Sheng" <sheng.yang@intel.com>]

On Wednesday 24 September 2008 16:53:15 Avi Kivity wrote:
> Yang, Sheng wrote:
> >> Shared guest interrupts is a prerequisite for merging into mainline.
> >> Without this, device assignment is useless in anything but a benchmark
> >> scenario.  I won't push device assignment for 2.6.28 without it.
> >>
> >> Shared host interrupts are a different matter; which one did you mean?
> >
> > Got confused...
> >
> > I think we are talking about share host interrupts, that is pre-assigned
> > device shared IRQ with other devices.
> >
> > Why share guest interrupts is a prerequisite...
>
> We only have three pci interrupts at this point (though this could be
> easily extended); if you start the guest with a non-trivial number of
> devices, you will have shared guest interrupts.
>
> (of course, when I pointed this out during review, people said it could
> be done later, then forgot all about it)
>
...... 

I think it's a performance issue, not break it? How about do it like Xen side? 
Try best to avoid the share, extended the pci interrupts, improve hash 
algorithm. Is there anything else we can do?

-- 
regards
Yang, Sheng