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.stabell...@eu.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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