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Re: [Xen-devel] [PATCH] xen: arm: Document xenheap_megabytes limitation

Hi Chris,

Thank you for patch.

On 23/07/15 17:31, Chris (Christopher) Brand wrote:
> In setup_mm(), the value passed as xenheap_megabytes gets
> converted to pages and passed to setup_xenheap_mappings(),
> which in turn passes it to create_32mb_mappings(), which
> contains an ASSERT that the value passed is a multiple of
> 32MB. So specifying any value that is not an integer multiple
> of 32 will cause Xen to hit this assert and fail to boot.
> Signed-off-by: Chris Brand <chris.brand@xxxxxxxxxxxx>

I wondering if it would worth to add a check in the code to ensure that
it's a multiple of 32MB?


Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>

> ---
>  docs/misc/xen-command-line.markdown | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> diff --git a/docs/misc/xen-command-line.markdown 
> b/docs/misc/xen-command-line.markdown
> index 4889e27626d4..f3d3bd6ce56a 100644
> --- a/docs/misc/xen-command-line.markdown
> +++ b/docs/misc/xen-command-line.markdown
> @@ -242,7 +242,7 @@ the NMI watchdog is also enabled.
>  > Default: `0` (1/32 of RAM)
> -Amount of RAM to set aside for the Xenheap.
> +Amount of RAM to set aside for the Xenheap. Must be an integer multiple of 
> 32.
>  By default will use 1/32 of the RAM up to a maximum of 1GB and with a
>  minimum of 32M, subject to a suitably aligned and sized contiguous


Julien Grall

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