Re: [Xen-devel] [PATCH v5] xen/arm64: check XSM Magic from the second unknown module.

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

On 04/05/2016 12:46 PM, fu.wei@xxxxxxxxxx wrote:
> From: Fu Wei <fu.wei@xxxxxxxxxx>
>
> This patch adds a has_xsm_magic helper function for detecting XSM
> from the second unknown module.
>
> If Xen can't get the kind of module from compatible, we guess the kind of
> these unknowns respectively:
>      (1) The first unknown must be kernel.
>      (2) Detect the XSM Magic from the 2nd unknown:
>          a. If it's XSM, set the kind as XSM, and that also means we
>         won't load ramdisk;
>         b. if it's not XSM, set the kind as ramdisk.
>         So if user want to load ramdisk, it must be the 2nd unknown.
> We also detect the XSM Magic for the following unknowns, then set its kind
> according to the return value of has_xsm_magic.
>
> By this way, arm64 behavior can be compatible to x86 and can simplify
> multi-arch bootloader such as GRUB.
>
> Signed-off-by: Fu Wei <fu.wei@xxxxxxxxxx>
Acked-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>


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