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

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Message-ID: <alpine.DEB.2.02.1303261637140.4430@kaball.uk.xensource.com>
Date:	Tue, 26 Mar 2013 16:39:30 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"will.deacon@....com" <will.deacon@....com>,
	"marc.zyngier@....com" <marc.zyngier@....com>
Subject: Re: [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@...citrix.com>
> > CC: rob.herring@...xeda.com
> > CC: will.deacon@....com
> > CC: marc.zyngier@....com
> > CC: arnd@...db.de
> 
> 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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