Jeremy Kerr <j...@ozlabs.org> writes:
> Change ac29c64089b7 swapped _PAGE_USER for _PAGE_PRIVILEGED, and
> introduced check_pte_access() which denied kernel access to
> non-_PAGE_PRIVILEGED pages.
>
> However, it didn't add _PAGE_PRIVILEGED to the hash fault handler for
> spufs' kernel accesses, so the DMAs required to establish SPE memory
> no longer work.
>
> This change adds _PAGE_PRIVILEGED to the hash fault handler for
> kernel accesses.
>
> Signed-off-by: Jeremy Kerr <j...@ozlabs.org>
> Reported-by: Sombat Tragolgosol <sombat3...@gmail.com>
> CC: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
> ---
> arch/powerpc/platforms/cell/spu_base.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/platforms/cell/spu_base.c
> b/arch/powerpc/platforms/cell/spu_base.c
> index 96c2b8a..0c45cdb 100644
> --- a/arch/powerpc/platforms/cell/spu_base.c
> +++ b/arch/powerpc/platforms/cell/spu_base.c
> @@ -197,7 +197,9 @@ static int __spu_trap_data_map(struct spu *spu, unsigned
> long ea, u64 dsisr)
> (REGION_ID(ea) != USER_REGION_ID)) {
>
> spin_unlock(&spu->register_lock);
> - ret = hash_page(ea, _PAGE_PRESENT | _PAGE_READ, 0x300, dsisr);
> + ret = hash_page(ea,
> + _PAGE_PRESENT | _PAGE_READ | _PAGE_PRIVILEGED,
> + 0x300, dsisr);
> spin_lock(&spu->register_lock);
>
> if (!ret) {
> --
> 2.7.4
