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Re: [PATCH v4 5/6] arm/mpu: Implement early_fdt_map support in MPU systems
- To: Hari Limaye <hari.limaye@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Mon, 21 Jul 2025 11:11:45 +0200
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- Cc: luca.fancellu@xxxxxxx, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
- Delivery-date: Mon, 21 Jul 2025 09:11:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21/07/2025 10:31, Hari Limaye wrote:
> From: Luca Fancellu <luca.fancellu@xxxxxxx>
>
> Implement the function early_fdt_map(), which is responsible for mapping
> the Device Tree Blob in the early stages of the boot process, for MPU
> systems.
>
> We make use of the map_pages_to_xen() and destroy_xen_mappings() APIs.
> In particular the latter function is necessary in the case that the
> initial mapping of the fdt_header is insufficient to cover the entire
> DTB, as we must destroy and then remap the region due to the APIs no
> providing support for extending the size of an existing region.
>
> Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
> Signed-off-by: Hari Limaye <hari.limaye@xxxxxxx>
> Reviewed-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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