Re: in-kernel interrupt controller steering

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On 06.03.2013, at 12:57, Paolo Bonzini wrote:

>>> I agree.  But is the device really being created at CREATE_DEVICE
>>> time? What happens if you create N CPUs and N-1 irqchips?
>> 
>> irqchip in CREATE_DEVICE is the IOAPIC, not the LAPIC. The LAPIC gets
>> spawned at vcpu creation.
>> 
>>> On x86, the LAPIC is created magically together with the VCPU.
>> 
>> Yes, and so far I haven't seen any proposal to change this even in
>> the CREATE_DEVICE world.
> 
> But don't you need anyway an id to get/set the device properties of
> the per-VCPU irqchip?  If you were adding the x86 irqchip with the
> new API, what would be the replacement of KVM_GET_LAPIC/KVM_SET_LAPIC?

In the current model, that would be ONE_REG registers on the vcpus.


Alex

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