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Re: [PATCH v2] xen/arm: p2m: fix pa_range_info for 52-bit pa range
- To: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Wed, 19 Oct 2022 17:01:22 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Wed, 19 Oct 2022 15:01:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Xenia,
On 19/10/2022 16:49, Xenia Ragiadakou wrote:
>
>
> Currently, the fields 'root_order' and 'sl0' of the pa_range_info for
> the 52-bit pa range have the values 3 and 3, respectively.
> This configuration does not match any of the valid root table configurations
> for 4KB granule and t0sz 12, described in ARM DDI 0487I.a D8.2.7.
>
> More specifically, according to ARM DDI 0487I.a D8.2.7, in order to support
> the 52-bit pa size with 4KB granule, the p2m root table needs to be configured
> either as a single table at level -1 or as 16 concatenated tables at level 0.
> Since, currently there is not support for level -1, set the 'root_order' and
> 'sl0' fields of the 52-bit pa_range_info according to the second approach.
>
> Note that the values of those fields are not used so far. This patch updates
> their values only for the sake of correctness.
>
> Fixes: 407b13a71e32 ("xen/arm: p2m don't fall over on FEAT_LPA enabled hw")
> Signed-off-by: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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