linux-kernel - Re: [PATCH v5 05/13] xen/arm,arm64: move Xen initialization earlier

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Message-ID: <alpine.DEB.2.02.1309051755560.6397@kaball.uk.xensource.com>
Date:	Thu, 5 Sep 2013 17:59:52 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"Ian.Campbell@...rix.com" <Ian.Campbell@...rix.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>
Subject: Re: [PATCH v5 05/13] xen/arm,arm64: move Xen initialization
 earlier

On Thu, 5 Sep 2013, Catalin Marinas wrote:
> On Thu, Aug 29, 2013 at 07:32:26PM +0100, Stefano Stabellini wrote:
> > Move Xen initialization earlier, before any DMA requests can be made.
> > 
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> 
> I guess you should cc the corresponding maintainers here.

Thanks for the reminder, I'll do that.


> >  arch/arm/include/asm/xen/hypervisor.h |    8 ++++++++
> >  arch/arm/kernel/setup.c               |    2 ++
> >  arch/arm/xen/enlighten.c              |   21 ++++++++++++++-------
> >  arch/arm64/kernel/setup.c             |    2 ++
> >  4 files changed, 26 insertions(+), 7 deletions(-)
> 
> [...]
> 
> > --- a/arch/arm64/kernel/setup.c
> > +++ b/arch/arm64/kernel/setup.c
> > @@ -53,6 +53,7 @@
> >  #include <asm/traps.h>
> >  #include <asm/memblock.h>
> >  #include <asm/psci.h>
> > +#include <asm/xen/hypervisor.h>
> >  
> >  unsigned int processor_id;
> >  EXPORT_SYMBOL(processor_id);
> > @@ -267,6 +268,7 @@ void __init setup_arch(char **cmdline_p)
> >  	unflatten_device_tree();
> >  
> >  	psci_init();
> > +	xen_early_init();
> 
> So Xen guests don't have any hope for single Image? Basically you set
> dma_ops unconditionally in xen_early_init(), even if the kernel is not
> intended to run under Xen.

That should not happen: if we are not running on Xen xen_early_init
returns early, before calling xen_mm_init.
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