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Re: [PATCH v3 5/5] xen/arm: map static memory on demand
- To: Julien Grall <julien@xxxxxxx>
- From: Luca Fancellu <Luca.Fancellu@xxxxxxx>
- Date: Fri, 29 Aug 2025 07:28:31 +0000
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- Cc: Hari Limaye <Hari.Limaye@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Penny Zheng <Penny.Zheng@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Michal Orzel <michal.orzel@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, 29 Aug 2025 07:29:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v3 5/5] xen/arm: map static memory on demand
Hi Julien,
> On 29 Aug 2025, at 08:22, Julien Grall <julien@xxxxxxx> wrote:
>
> Hi Hari,
>
> On 28/08/2025 12:12, 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
>
> Even on the MMU system we don't always map the full RAM (for instance on
> arm32). This is why we have infrastructure like map_domain_page() (Temporary
> mapping) and map_domain_page_global() (more permanent).
>
> 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.
>
> I am guessing you implemented the helper because in
> unmap_staticmem_pages_to_xen(), we are calling scrub_one_page(). This will be
> using map_domain_page() and unmap_domain_page(). I am a bit confused why we
> end up with brand new helpers rather than implementation map_domain_page()
> and unmap_domain_page()?
yes I agree, scrub_one_page is already using {un}map_domain_page(), we will
investigate about it.
Cheers,
Luca
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