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RE: [PATCH v2] xen/arm32: head: Widen the use of the temporary mapping
- To: Julien Grall <julien@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Henry Wang <Henry.Wang@xxxxxxx>
- Date: Tue, 25 Jul 2023 01:30:13 +0000
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- Cc: Luca Fancellu <Luca.Fancellu@xxxxxxx>, "michal.orzel@xxxxxxx" <michal.orzel@xxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Tue, 25 Jul 2023 01:30:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v2] xen/arm32: head: Widen the use of the temporary mapping
Hi Julien,
> -----Original Message-----
> Subject: [PATCH v2] xen/arm32: head: Widen the use of the temporary
> mapping
>
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> At the moment, the temporary mapping is only used when the virtual
> runtime region of Xen is clashing with the physical region.
>
> In follow-up patches, we will rework how secondary CPU bring-up works
> and it will be convenient to use the fixmap area for accessing
> the root page-table (it is per-cpu).
>
> Rework the code to use temporary mapping when the Xen physical address
> is not overlapping with the temporary mapping.
>
> This also has the advantage to simplify the logic to identity map
> Xen.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Henry Wang <Henry.Wang@xxxxxxx>
Kind regards,
Henry
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