Add a new device tree property `v8r_el1_msa` to select the MSA (memory
system architecture) at EL1 for Armv8-R architecture: MPU or MMU, the
former is the default if the property is not passed.
Implement the dom0less path to parse the new device tree property, add
a new domctl hypercall input parameter `v8r_el1_msa` for arm and
add the sanitisation in arch_sanitise_domain_config(), the parameter
is intended to be used on CONFIG_MPU systems and returns an error if
selected for MMU.
While there, add explicit padding and check that it's zero during
arch domain config sanitisation, given the breaking change, bump the
XEN_DOMCTL_INTERFACE_VERSION.
Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
Implement reference counting to enable inclusive MPU regions. An
inclusive region is defined as a region encapsulated inside a
previously allocated region sharing the same permissions.
Reference counts are incremented and decremented in
xen_mpumap_update_entry. A region will be destroyed if the reference
count is 0 upon calling destroy_xen_mappings and if the full region
range is specified.
Additionally XEN_MPUMAP_ENTRY_SHIFT and XEN_MPUMAP_ENTRY_SHIFT_ZERO are
no longer hardcoded and defined inside asm-offsets.c.
Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
Implement `setup_mm` for MPU systems. This variant does not require
setting up a direct map.
To reduce code duplication the common initalisation code for both MPU
and MMU Arm64 configurations is refactored into `setup_mm`. Platform-specific
setup steps are now handled by a new helper function `setup_mm_helper`.
Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
Harry Ramsey