Re: [Xen-devel] [PATCH 1/4] xen/arm: basic PSCI support, implement cpu_on

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 12 Apr 2013, Ian Campbell wrote:
> On Fri, 2013-04-12 at 00:42 +0100, Stefano Stabellini wrote:
> > On Thu, 11 Apr 2013, Ian Campbell wrote:
> > > On Wed, 2013-04-10 at 11:13 +0100, Ian Campbell wrote:
> > > > On Tue, 2013-04-09 at 15:23 +0100, Marc Zyngier wrote:
> > > > > On 09/04/13 14:57, Ian Campbell wrote:
> > > > > > On Thu, 2013-03-21 at 18:42 +0000, Stefano Stabellini wrote:
> > > > > >> Implement support for ARM Power State Coordination Interface, PSCI 
> > > > > >> in
> > > > > >> short. The current implementation is based on HVC and only 
> > > > > >> supports the
> > > > > >> cpu_on call.
> > > > > > 
> > > > > > Doesn't the PSCI interface require the use of SMC not HVC?
> > > > > 
> > > > > You can use both, and KVM uses HVC.
> > > > 
> > > > It makes good sense for Xen to follow suit then I think.
> > > 
> > > Stefano, this means that Xen might need to rewrite the dom0 dtb to
> > > s/smc/hvc/ I think?
> > 
> > We do need to provide a dtb with the right psci method, see this patch
> > for a DomU example:
> > 
> > http://marc.info/?l=linux-arm-kernel&m=136430894810691&w=2
> 
> Right, I was talking about dom0 though which may already have a PSCI
> entry for the physical hardware (which Xen ultimately needs to use), so
> we need to rewrite it.

Yep, that's right.

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