Given how the meaning of the attribute bits for page table entry types is slightly awkward, and changes between levels, add some helpers to abstract from this. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Leif Lindholm <leif@nuviainc.com> Reviewed-by: Ashish Singhal <ashishsingha@nvidia.com> Tested-by: Ashish Singhal <ashishsingha@nvidia.com> Tested-by: Laszlo Ersek <lersek@redhat.com>