3.16.37-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
commit aac55d7573c5d46ed9a62818d5d3e69dd2060105 upstream.
With Linux page size of 64K and hardware only supporting 4K HPTE, if we
use subpage protection, we always fail for the subpage 0 as shown
below (using the selftest subpage_prot test):
520175565: (4520111850): Failed at 0x3fffad4b0000 (p=13,sp=0,w=0), want=fault, got=pass !
4520890210: (4520826495): Failed at 0x3fffad5b0000 (p=29,sp=0,w=0), want=fault, got=pass !
4521574251: (4521510536): Failed at 0x3fffad6b0000 (p=45,sp=0,w=0), want=fault, got=pass !
4522258324: (4522194609): Failed at 0x3fffad7b0000 (p=61,sp=0,w=0), want=fault, got=pass !
This is because hash preload wrongly inserts the HPTE entry for subpage
0 without looking at the subpage protection information.
Fix it by teaching should_hash_preload() not to preload if we have
subpage protection configured for that range.
It appears this has been broken since it was introduced in 2008.
Fixes: fa28237cfcc5 ("[POWERPC] Provide a way to protect 4k subpages when using 64k pages")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
[mpe: Rework into should_hash_preload() to avoid build fails w/SLICES=n]
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
arch/powerpc/mm/hash_utils_64.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -1199,8 +1199,16 @@ EXPORT_SYMBOL_GPL(hash_page);
#ifdef CONFIG_PPC_MM_SLICES
static bool should_hash_preload(struct mm_struct *mm, unsigned long ea)
{
+ int psize = get_slice_psize(mm, ea);
+
/* We only prefault standard pages for now */
- if (unlikely(get_slice_psize(mm, ea) != mm->context.user_psize))
+ if (unlikely(psize != mm->context.user_psize))
+ return false;
+
+ /*
+ * Don't prefault if subpage protection is enabled for the EA.
+ */
+ if (unlikely((psize == MMU_PAGE_4K) && subpage_protection(mm, ea)))
return false;
return true;
--
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