On 09/16/2010 02:57 PM, Michael S. Tsirkin wrote:
>
> > > If you want to split parts that asserts irq and de-asserts it then we
> > > should have irqfd that tracks line status and knows interrupt line
> > > polarity.
> >
> > Yes, it can know about polarity even though I think it's cleaner to do
this
> > per gsi. But it can not track line status as line is shared with
> > other devices.
> It should track only device's line status.
There is no such thing as device's line status on real hardware, either.
Devices do not drive INT# high: they drive it low (all the time)
or do not drive it at all.
That's just an implementation detail. Devices either assert INT# or
they do not. Tying the wires together constitutes an AND gate. This
gate has to be modelled somewhere, currently it's in qemu's pci emulation.
--
error compiling committee.c: too many arguments to function
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