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

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Message-ID: <20130905162026.GJ11887@arm.com>
Date:	Thu, 5 Sep 2013 17:20:27 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	"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, 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.

>  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.

-- 
Catalin
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