[Xen-devel] [PATCH] xen/events: Support event channel rebind on ARM
David Vrabel
david.vrabel at citrix.com
Mon Jul 27 03:02:03 PDT 2015
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 at citrix.com>
Provided you make xen_support_evtchn_rebind() an inline function.
David
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