Re: [Xen-devel] [PATCH v3 13/24] xen/arm: Implement hypercall PHYSDEVOP_{, un}map_pirq

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian,

On 23/02/15 15:28, Ian Campbell wrote:
> On Mon, 2015-02-23 at 09:33 +0000, Jan Beulich wrote:
>>>>> On 20.02.15 at 17:53, <ian.campbell@xxxxxxxxxx> wrote:
>>> Jan, do you have any feeling for how this is going to play out on x86
>>> with the vapic stuff?
>>
>> The vapic logic shouldn't require any physdevop involvement, so if
>> I read right what you propose (not having such a requirement /
>> connection on ARM) either, I agree that a new domctl should be all
>> that's needed (if XEN_DOMCTL_{,un}bind_pt_irq can't be re-used).
> 
> Actually, I think bind_pt_irq with a new PT_IRQ_TYPE_* would be a good
> option.
> 
> An ARM SPI is a bit like an ISA IRQ, but not close enough to reuse IMHO
> (and the datatype would need widening).

We have to think about MSI and other type too...

In any case a DOMCTL is not suitable here because a guest kernel may
need to map/unmap IRQ too (think about ACPI or device passthrough).

Regards,

-- 
Julien Grall

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