This is a note to let you know that I've just added the patch titled
powerpc/spufs: Fix hash faults for kernel regions
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-spufs-fix-hash-faults-for-kernel-regions.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d75e4919cc0b6fbcbc8d6654ef66d87a9dbf1526 Mon Sep 17 00:00:00 2001
From: Jeremy Kerr <jk@xxxxxxxxxx>
Date: Wed, 24 May 2017 16:49:59 +1000
Subject: powerpc/spufs: Fix hash faults for kernel regions
From: Jeremy Kerr <jk@xxxxxxxxxx>
commit d75e4919cc0b6fbcbc8d6654ef66d87a9dbf1526 upstream.
Commit ac29c64089b7 ("powerpc/mm: Replace _PAGE_USER with
_PAGE_PRIVILEGED") 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.
Fixes: ac29c64089b7 ("powerpc/mm: Replace _PAGE_USER with _PAGE_PRIVILEGED")
Signed-off-by: Jeremy Kerr <jk@xxxxxxxxxx>
Reported-by: Sombat Tragolgosol <sombat3960@xxxxxxxxx>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/platforms/cell/spu_base.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- 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 sp
(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) {
Patches currently in stable-queue which might be from jk@xxxxxxxxxx are
queue-4.9/powerpc-spufs-fix-hash-faults-for-kernel-regions.patch