xen/arm: Allow hypervisor access to mem_access protected pages
The hypervisor may use the MMU to verify that the given guest has read/write
access to a given page during hypercalls. As we may have custom mem_access
permissions set on these pages, we do a software-based type checking in case
the MMU based approach failed, but only if mem_access_enabled is set.
These memory accesses are not forwarded to the mem_event listener. Accesses
performed by the hypervisor are currently not part of the mem_access scheme.
This is consistent behaviour with the x86 side as well.
Signed-off-by: Tamas K Lengyel <tklengyel@sec.in.tum.de>
Reviewed-by: Julien Grall <julien.grall@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
projects / xen.git / commit