Re: [Xen-devel] [PATCH v2 3/9] xen: arm: handle concatenated root tables in dump_pt_walk

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian,

On 04/09/14 09:14, Ian Campbell wrote:
> ARM allows for the concatenation of pages at the root of a p2m (but not a
> regular page table) in order to support a larger IPA space than the number of
> levels in the P2M would normally support. We use this to support 40-bit guest
> addresses.
>
> Previously we were unable to dump IPAs which were outside the first page of the
> root. To fix this we adjust dump_pt_walk to take the machine address of the
> page table root instead of expecting the caller to have mapper it. This allows
NIT: s/mapper/mapped/ ?

[..]

> -    mappings[root_level] = root;
> +    if ( nr_root_tables > 1 )
> +    {
> +        /*
> +         * Concatenated root-level tables. The table number will be
> +         * the offset at the previous level. It is not possible to
> +         * concatenate a level-0 root.
> +         */
> +        BUG_ON(root_level == 0);
> +        root_table = offsets[root_level - 1];
> +        printk("Using concatenated root table %d\n", root_table);
NIT: %u

Other than this 2 minor comments:

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

Regards,

--
Julien Grall

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