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Message-ID: <alpine.LFD.2.03.1304051536250.1171@syhkavp.arg>
Date: Fri, 5 Apr 2013 15:41:36 -0400 (EDT)
From: Nicolas Pitre <nicolas.pitre@...aro.org>
To: Stefano Stabellini <stefano.stabellini@...citrix.com>
cc: "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>,
"will.deacon@....com" <will.deacon@....com>,
"arnd@...db.de" <arnd@...db.de>,
"rob.herring@...xeda.com" <rob.herring@...xeda.com>
Subject: Re: [PATCH v6 4/4] xen/arm: introduce xen_early_init, use PSCI on
xen
On Fri, 5 Apr 2013, Stefano Stabellini wrote:
> On Fri, 5 Apr 2013, Stefano Stabellini wrote:
> > - we are running on Xen
> > Xen is running on the platform, we are running as a guest on Xen and an
> > hypervisor node is available on device tree.
> > Let's also assume that there aren't any "arm,cci" compatible nodes on
> > device tree because Xen wouldn't export this kind of information to any
> > guests right now. Therefore PSCI should be used to boot secondary cpus.
>
> Just in case this isn't clear enough: we don't have big.LITTLE support
> in Xen right now, not in the hypervisor and certainly not in guests.
> I'm keen on having big.LITTLE support in the hypervisor (thus some
> code similar to your MCPM patch series will probably end up in Xen at
> some point) but I doubt we'll expose big.LITTLE to guests any time
> soon. It's going to be years, so I am not particularly worried about
> it right now.
I fully understand that it is unlikely that a Xen guest will "see" a
big.LITTLE environment in the near future.
My concern is about a kernel that is _configured_ to run either on a
native VExpress machine that might or might not be b.L, or as a Xen
guest, in the same zImage binary.
Nicolas
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