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Re: [Xen-devel] [PATCH v3 10/24] xen/arm: gic: Add sanity checks gic_route_irq_to_guest

On Mon, 2015-02-23 at 15:47 +0000, Julien Grall wrote:
> Hi Ian,
> On 23/02/15 15:20, Ian Campbell wrote:
> > On Fri, 2015-02-20 at 17:28 +0000, Julien Grall wrote:
> >> The priority is controlled by route_irq_to_guest and set statically
> >> using GIC_PRI_IRQ.
> >>
> >> If we decide to hardcoded the priority here, we should drop the
> >> parameter on gic_route_irq_guest. But not keeping both.
> > 
> > There is a middle ground, which is for guest-routed IRQs to be allowed a
> > subset of the real priorities, but until those associated checks are in
> > place I think hardcoding in gic_route_irq_to_guest leaves less scope for
> > mistakes.
> The interface for routing an IRQ to xen (gic_route_irq_to_xen) is taking
> the priority in parameter.

It's useful and safe in the route to xen case.

> I would prefer if we keep the same interface for guest and then hardcode
> the value in route_irq_to_guest.

In which case I think route_irq_to_guest should complain/error-out if
the priority given is not the default one until such a time as it
understands which inputs are safe.


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