Re: [Xen-devel] [PATCH v2] docs/arm64: clarify the documention for loading XSM support

[Julien Grall <julien.grall@xxxxxxx>]

Hi Ian,

On 25/04/16 17:38, Ian Jackson wrote:
> From: Fu Wei <fu.wei@xxxxxxxxxx>
>
> Improve the clarity of the wording introduced in 67831c4c
> "docs/arm64: update the documentation for loading XSM support"
>
> Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> CC: Fu Wei <fu.wei@xxxxxxxxxx>
> CC: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxx>

Regards,

> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> ---
> v2: Tabify (to conform to the rest of the file)
> ---
>   docs/misc/arm/device-tree/booting.txt |   29 +++++++++++++++++------------
>   1 file changed, 17 insertions(+), 12 deletions(-)
>
> diff --git a/docs/misc/arm/device-tree/booting.txt 
> b/docs/misc/arm/device-tree/booting.txt
> index cae46eda..ce2d0dc 100644
> --- a/docs/misc/arm/device-tree/booting.txt
> +++ b/docs/misc/arm/device-tree/booting.txt
> @@ -26,19 +26,24 @@ Each node contains the following properties:
>         Xen will assume that the first module which lacks a more
>         specific compatible string is a "multiboot,kernel".
>
> -       Xen will check all the modules for the XSM Magic from the second
> -       module that lacks a specific compatible string. According to the
> -       result of the detection:
> -       - if it's an XSM, Xen will assume its compatible string is
> +       Xen will examine each module, starting from the second
> +       module that lacks a specific compatible string.  Xen will
> +       check each such module for the XSM Magic number:
> +
> +       - For a module which has the XSM Magic number: it will be
> +         treated by Xen as if its compatible string was
>           "xen,xsm-policy";
> -       - if it's not an XSM, for the second module that lacks a specific
> -         compatible string, Xen will assume its compatible string is
> -         "multiboot,ramdisk"; the third and subsequent modules that
> -         lack a specific compatible string will not receive any special
> -         treatment.
> -       This means that if the ramdisk module is present and does not have
> -       the compatible string "multiboot,ramdisk", then it must always be
> -       the second module.
> +
> +       - For a module which does not have the XSM Magic: the second
> +         module lacking a compatible string will be treated by Xen as
> +         if its compatible string was "multiboot,ramdisk"; for the
> +         third and subsequent modules which lack a specific
> +         compatible string, Xen will not apply any special treatment.
> +
> +       This means if the ramdisk module is present and does not have the
> +       compatible string "multiboot,ramdisk", then it must always be the
> +       second module.
> +
>         Note: This XSM Magic detection behavior was introduced by Xen 4.7.
>         Xen 4.6 (and downwards) still requires the XSM module to have the
>         compatible string "xen,xsm-policy".
--
Julien Grall

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