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Re: [Xen-devel] [PATCH v2 5/6] xenvm: add a simple PSCI node and a second cpu

On Tue, 26 Mar 2013, Arnd Bergmann wrote:
> On Tuesday 26 March 2013, Stefano Stabellini wrote:
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > CC: rob.herring@xxxxxxxxxxx
> > CC: will.deacon@xxxxxxx
> > CC: marc.zyngier@xxxxxxx
> > CC: arnd@xxxxxxxx
> I wonder how this is supposed to work on real systems. Shouldn't the dt
> blob be filled out with the correct number of CPUs at the time you start
> the guest? 
> This change looks like you just make all guests use a hardcoded
> set of two CPUs instead of just one, but you probably want to allow any
> number between 1 and the number of physically present cores.

That's right, the DT passed on to the guests is generated by the
hypervisor. This is just an example, adding a cpu and a psci node is
just meant to make it clear that Xen supports multi-vcpu guests using
PSCI to bootstrap secondary cpus.

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