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Re: [PATCH 5/5] xen/arm: map static memory on demand
- To: Hari Limaye <hari.limaye@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Fri, 22 Aug 2025 09:50:24 +0200
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- Cc: <luca.fancellu@xxxxxxx>, Penny Zheng <Penny.Zheng@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Chen <wei.chen@xxxxxxx>
- Delivery-date: Fri, 22 Aug 2025 07:50:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30/07/2025 10:45, Hari Limaye wrote:
> From: Penny Zheng <Penny.Zheng@xxxxxxx>
>
> In the function `init_staticmem_pages` we need to have mapped static
> memory banks for initialization. Unlike on an MMU system, we cannot map
> the entire RAM on an MPU system as we have a limited number of MPU
> memory regions. To solve this, transiently map the static memory banks
> for initialization.
How does this correspond to Arm32 MPU (R52), where all of the RAM will be
covered? I don't think 'transient' mappings will be needed there but all of your
work targets common (i.e. not only Arm64) MPU code.
~Michal
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