Re: [Xen-devel] [PATCH v6 1/4] arm: introduce psci_smp_ops
From: Stefano Stabellini
Date: Wed Apr 24 2013 - 14:13:26 EST
On Mon, 22 Apr 2013, Nicolas Pitre wrote:
> > I think the key thing that non-Xen folks aren't aware of is that
> > although Xen passes the majority of the underlying hardware to the dom0
> > kernel to manage one of the few things it does not expose to guests
> > (where "guests" includes dom0) is the SMP topology of the underlying system.
> I suspect it is unlikely to pass on the DT information about the CCI
> either. Which means that, in the case that started this thread, the
> smp_init function needed by MCPM will simply return false and the next
> priority in the list i.e. plain PSCI will be initialized instead.
> I don't forsee the need to poke at the hardware directly within
> ->smp_init, not since everything is moving to DT now.
> Sure there are ways to screw up Xen support from within this hook, but
> that can be achieved in many other places. Will Xen take over every
> possible hooks in the kernel to prevent that from happening?
> So please let's not cry wolf needlessly.
OK, you convinced me :-)
I'll drop the patch.
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