arm64: Block hibernate and kexec while RMM is active

RMM can be deactivated only after all delegated granules have been
reclaimed. If a new kernel is entered while any granules remain in the
Realm PAS, accesses to that memory can raise a Granule Protection Fault
and be fatal to the new kernel.

Crash kexec/kdump needs separate handling. It can be supported only once
the crash kernel can tolerate delegated memory inherited from the primary
kernel. i.e., be able to read the pages safely and fixup the GPF. Until
then disable the kexec completely.

Hibernate has a similar problem. The image cannot be safely saved for
delegated pages, as the RMM doesn't support exporting the pages.
Also, on the resume path, if the RMM is active, there could be delegated
granules and overwriting them is fatal.

Disable both kexec and hiberation while the RMM is active.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

0 files changed, 0 insertions, 0 deletions