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Re: [PATCH v2 5/5] xen/arm: mm: Reduce the area that xen_second covers
- To: Julien Grall <julien@xxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Thu, 21 Jul 2022 10:47:12 +0000
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Michal Orzel <Michal.Orzel@xxxxxxx>
- Delivery-date: Thu, 21 Jul 2022 10:47:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v2 5/5] xen/arm: mm: Reduce the area that xen_second covers
Hi Julien,
> On 20 Jul 2022, at 19:44, Julien Grall <julien@xxxxxxx> wrote:
>
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> At the moment, xen_second is used to cover the first 2GB of the
> virtual address space. With the recent rework of the page-tables,
> only the first 1GB region (where Xen resides) is effectively used.
>
> In addition to that, I would like to reshuffle the memory layout.
> So Xen mappings may not be anymore in the first 2GB of the virtual
> address space.
>
> Therefore, rework xen_second so it only covers the 1GB region where
> Xen will reside.
>
> With this change, xen_second doesn't cover anymore the xenheap area
> on arm32. So, we first need to add memory to the boot allocator before
> setting up the xenheap mappings.
>
> Take the opportunity to update the comments on top of xen_fixmap and
> xen_xenmap.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
> Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
Cheers
Bertrand
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