Hi Hari,
On 28/08/2025 12:12, Hari Limaye wrote:
From: Penny Zheng <[email protected]>
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()?
Cheers,
--
Julien Grall
