On Tue, Nov 20, 2012 at 06:54:20AM +1100, Benjamin Herrenschmidt wrote:
> On Mon, 2012-11-19 at 17:22 +0100, Alexander Graf 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
> > > xics init code can no longer auto-detect the number of cpus ("interrupt
> > > servers" in XICS terminology) and so we must pass that in explicitly from
> > > the platform code.
> >
> > Does this still hold true with the new in-kernel interrupt controller
> > workflow?
>
> We need to look into this. The in-kernel ICPs will still certainly be
> created early along with the VCPUs, however we might be able to delay
> the creation of the qemu emulation when not using the former.
I'd really prefer not to have two different initialization orders in
qemu though. I think we'll want the ICP initialization first for CPU
hotplug one day anyway.
--
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
