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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.02.15 at 16:53, <julien.grall@xxxxxxxxxx> wrote:
> 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...

Which that domctl already provides for.

> 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).

But not the physical IRQ I suppose. The virtual counterpart is what
should be used there, and that's what said domctl extablishes.

Jan


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