APIC Doubt

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Hi,

Can anyone explain me the routing from IOAPIC to LAPIC and how the
LAPIC/vcpu is choosen for the given IRQ. 

I found two different structures for IRQ routing and I am little
confused with them. 
	1. kvm_kernel_irq_routing_entry
	2. kvm_irq_routing_entry 

And also it will really helpful if someone can tell me how IRQ is mapped
to specific interrupt vector. I believe it will be programmed by the
guest (i.e. guest can change the mapping) but through which API it is
changing and where exactly it is stored. 

Thanks,
Senthilkumaran R

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