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Subject[RFC v6 26/62] powerpc: Program HPTE key protection bits
Date
Map the PTE protection key bits to the HPTE key protection bits,
while creating HPTE entries.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
---
arch/powerpc/include/asm/book3s/64/mmu-hash.h | 5 +++++
arch/powerpc/include/asm/pkeys.h | 12 ++++++++++++
arch/powerpc/mm/hash_utils_64.c | 4 ++++
3 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
index 6981a52..f7a6ed3 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
@@ -90,6 +90,8 @@
#define HPTE_R_PP0 ASM_CONST(0x8000000000000000)
#define HPTE_R_TS ASM_CONST(0x4000000000000000)
#define HPTE_R_KEY_HI ASM_CONST(0x3000000000000000)
+#define HPTE_R_KEY_BIT0 ASM_CONST(0x2000000000000000)
+#define HPTE_R_KEY_BIT1 ASM_CONST(0x1000000000000000)
#define HPTE_R_RPN_SHIFT 12
#define HPTE_R_RPN ASM_CONST(0x0ffffffffffff000)
#define HPTE_R_RPN_3_0 ASM_CONST(0x01fffffffffff000)
@@ -104,6 +106,9 @@
#define HPTE_R_C ASM_CONST(0x0000000000000080)
#define HPTE_R_R ASM_CONST(0x0000000000000100)
#define HPTE_R_KEY_LO ASM_CONST(0x0000000000000e00)
+#define HPTE_R_KEY_BIT2 ASM_CONST(0x0000000000000800)
+#define HPTE_R_KEY_BIT3 ASM_CONST(0x0000000000000400)
+#define HPTE_R_KEY_BIT4 ASM_CONST(0x0000000000000200)

#define HPTE_V_1TB_SEG ASM_CONST(0x4000000000000000)
#define HPTE_V_VRMA_MASK ASM_CONST(0x4001ffffff000000)
diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index ad39db0..bbb5d85 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -41,6 +41,18 @@ static inline u64 vmflag_to_page_pkey_bits(u64 vm_flags)
((vm_flags & VM_PKEY_BIT4) ? H_PAGE_PKEY_BIT0 : 0x0UL));
}

+static inline u64 pte_to_hpte_pkey_bits(u64 pteflags)
+{
+ if (!pkey_inited)
+ return 0x0UL;
+
+ return (((pteflags & H_PAGE_PKEY_BIT0) ? HPTE_R_KEY_BIT0 : 0x0UL) |
+ ((pteflags & H_PAGE_PKEY_BIT1) ? HPTE_R_KEY_BIT1 : 0x0UL) |
+ ((pteflags & H_PAGE_PKEY_BIT2) ? HPTE_R_KEY_BIT2 : 0x0UL) |
+ ((pteflags & H_PAGE_PKEY_BIT3) ? HPTE_R_KEY_BIT3 : 0x0UL) |
+ ((pteflags & H_PAGE_PKEY_BIT4) ? HPTE_R_KEY_BIT4 : 0x0UL));
+}
+
static inline int vma_pkey(struct vm_area_struct *vma)
{
if (!pkey_inited)
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index f88423b..1e74529 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -231,6 +231,10 @@ unsigned long htab_convert_pte_flags(unsigned long pteflags)
*/
rflags |= HPTE_R_M;

+#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
+ rflags |= pte_to_hpte_pkey_bits(pteflags);
+#endif
+
return rflags;
}

--
1.7.1
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