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Re: [Xen-devel] [PATCH] xen/events: Support event channel rebind on ARM

On 25/07/15 18:34, Julien Grall wrote:
> Currently, the event channel rebind code is gated with the presence of
> the vector callback.
> The virtual interrupt controller on ARM has the concept of per-CPU
> interrupt (PPI) which allow us to support per-VCPU event channel.
> Therefore there is no need of vector callback for ARM.
> Xen is already using a free PPI to notify the guest VCPU of an event.
> Furthermore, the xen code initialization in Linux (see
> arch/arm/xen/enlighten.c) is requesting correctly a per-CPU IRQ.
> Introduce new macro xen_support_evtchn_rebind to allow architecture
> decide whether rebind an event is support or not. It will always return
> 1 on ARM and keep the same behavior on x86.
> This is also allow us to drop the usage of xen_have_vector_callback
> entirely in the ARM code.

Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>

Provided you make xen_support_evtchn_rebind() an inline function.


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