linux-kernel - Re: [Xen-devel] [PATCH 5/9] ARM: Xen: fix initial build problems:

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Date:	Wed, 10 Oct 2012 08:54:47 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH 5/9] ARM: Xen: fix initial build problems:

On Tue, 2012-10-09 at 19:21 +0100, Arnd Bergmann wrote:
> On Tuesday 09 October 2012, Stefano Stabellini wrote:
> > >  config XEN
> > >       bool "Xen guest support on ARM (EXPERIMENTAL)"
> > >       depends on EXPERIMENTAL && ARM && OF
> > > +     depends on !CPU_V6
> > >       help
> > >         Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
> > 
> > Considering that we rely on the virtualization extensions, this one can
> > be:
> > 
> >     depends on CPU_V7
> > 
> > The rest looks fine. I can submit a second patch to change !CPU_V6 into
> > CPU_V7 later, if you prefer.
> 
> CPU_V6 and CPU_V7 are not exclusive, I saw the problem when building a
> combined kernel for both V6 and V7. The code also needs to depend on ARMv7
> with virtualization extensions, but that is a different issue. We don't
> actually have a configuration symbol for that yet, as far as I can tell.

I don't think the guest kernels (including dom0) need the extensions to
run under Xen, they are only need by Xen itself. The guests should just
see a relatively normal v7 processor. 

Stefano, does that sound right?

Ian.

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