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.
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