On 24.04.19 19:59, Julien Grall wrote:
Currently, xen_pt_update_entry() is only able to update the region covered
by xen_second (i.e 0 to 0x7fffffff).
Because of the restriction we end to have multiple functions in mm.c
modifying the page-tables differently.
Furthermore, we never walked the page-tables fully. This means that any
change in the layout may requires major rewrite of the page-tables code.
Lastly, we have been quite lucky that no one ever tried to pass an address
outside this range because it would have blown-up.
xen_pt_update_entry() is reworked to walk over the page-tables every
time. The logic has been borrowed from arch/arm/p2m.c and contain some
limitations for the time being:
- Superpage cannot be shattered
- Only level 3 (i.e 4KB) can be done
Note that the parameter 'addr' has been renamed to 'virt' to make clear
we are dealing with a virtual address.
Signed-off-by: Julien Grall <julien.gr...@arm.com>
---
Reviewed-by: Andrii Anisov <andrii_ani...@epam.com>
--
Sincerely,
Andrii Anisov.
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