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Re: [Xen-devel] [PATCH for-4.5 7/8] xen/irq: Handle multiple action per IRQ

Hi Ian,

On 02/19/2014 11:55 AM, Ian Campbell wrote:
> On Fri, 2014-01-24 at 16:43 +0000, Julien Grall wrote:
>> On ARM, it may happen (eg ARM SMMU) to setup multiple handler for the same
>> interrupt.
> Mention here that you are therefore creating a linked list of actions
> for each interrupt.
> If you use xen/list.h for this then you get a load of helpers and
> iterators which would save you open coding them.

I will use it on the next version.

> Some discussion of the behaviour wrt acking the physical interrupt might
> also be interesting, especially in the case where the shared IRQ is
> routed to the guest and to the hypervisor or to multiple guests.

For now, it's forbidden by the patch #3 of this series. Sharing IRQ
between Xen and guest will need a bit of rework, mainly when the
Stefano's patch series to remove the maintenance interrupt will be applied.


Julien Grall

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