On Fri, Mar 15, 2013 at 01:33:18PM +0100, Alexander Graf wrote: > > On 14.03.2013, at 02:53, David Gibson wrote: > > > Currently, the pseries machine initializes the cpus, then the XICS > > interrupt controller. However, to support the upcoming in-kernel XICS > > implementation we will need to initialize the irq controller before the > > vcpus. This patch makes the necesssary rearrangement. This means the > > We're changing that notion in the in-kernel XICS discussions. The flow will > look like this: > > * create vcpus > * create XICS > * foreach (vcpu) > * enable_cap(vcpu, CAP_XICS_SERVER, xics_handle) > > However, that means we still need to know the maximum number of > supported vcpus during the create phase. That number can be bigger > than smp_cpus though, since you probably want to support hotplug add > of CPUs later on. > > Can't we just make the number of supported "interrupt servers" a > constant?
I suppose, but we need an allocation for each one, so its a bit ugly.
In any case although the comment is a bit out of date, this patch also
creates a logical place to put per-cpu XICS initialization which we
will still need for the new interface.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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