APIC lookups

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Hi,

I've noticed that kvm_irq_delivery_to_apic() is locating the destination
APIC by running through kvm_for_each_vcpu() which becomes a scalability
issue with a large number if vcpus.

I'm thinking about speeding that up using a radix tree for lookups, and
was wondering if it sounds right.

-- 

Sasha.

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