Userspace specific host irq?

[Sheng Yang <sheng@linux.intel.com>]

Hi all

This piece of code puzzled me at all time:

virt/kvm/kvm_main.c:assigned_device_update_intx()

> 		if (airq->host_irq)
> 			adev->host_irq = airq->host_irq;
> 		else
> 			adev->host_irq = adev->dev->irq;

I don't know why we can let userspace use a different host_irq rather than the 
real one.

I've queried Amit and Ben-Ami who are the original author about this question, 
and they also think this piece of code is redundancy. Send the question to the 
mailing list, if everyone agree, I would discard this one. 

Thanks!

-- 
regards
Yang, Sheng