Hi!

> But personally I would prefer we
> check irqchip routing entries have flat mapping, ie gsi = irqchip.pin
> since in any case we don't want/expect the userspace to play with that.

 Why? On x86 userspace perfectly can play with it. We can imagine some very new 
qemu version in
future which has all arch-specific kludges like "direct mapping" removed and 
relying fully on
routing which it sets up from scratch, in the same way as x86 qemu does this. 
Or we can imagine some
new, legacy-free hypervisor implementation. The gsi == irqchip.pin limitation 
is just what we have
now by default, for backwards compatibility. But by design we were never 
obliged to stick to this.
 Well, it's just MHO...

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia


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