powerpc: Program HPTE key protection bits

Map the PTE protection key bits to the HPTE key protection bits,
while creating HPTE  entries.
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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_R_KEY		(HPTE_R_KEY_LO | HPTE_R_KEY_HI)
 
 #define HPTE_V_1TB_SEG		ASM_CONST(0x4000000000000000)

arch/powerpc/include/asm/mmu_context.h

@@ -203,6 +203,12 @@ static inline int vma_pkey(struct vm_area_struct *vma)
 {
 	return 0;
 }
+
+static inline u64 pte_to_hpte_pkey_bits(u64 pteflags)
+{
+	return 0x0UL;
+}
+
 #endif /* CONFIG_PPC_MEM_KEYS */
 
 #endif /* __KERNEL__ */

arch/powerpc/include/asm/pkeys.h

@@ -62,6 +62,15 @@ static inline int vma_pkey(struct vm_area_struct *vma)
 
 #define arch_max_pkey() pkeys_total
 
+static inline u64 pte_to_hpte_pkey_bits(u64 pteflags)
+{
+	return (((pteflags & H_PTE_PKEY_BIT0) ? HPTE_R_KEY_BIT0 : 0x0UL) |
+		((pteflags & H_PTE_PKEY_BIT1) ? HPTE_R_KEY_BIT1 : 0x0UL) |
+		((pteflags & H_PTE_PKEY_BIT2) ? HPTE_R_KEY_BIT2 : 0x0UL) |
+		((pteflags & H_PTE_PKEY_BIT3) ? HPTE_R_KEY_BIT3 : 0x0UL) |
+		((pteflags & H_PTE_PKEY_BIT4) ? HPTE_R_KEY_BIT4 : 0x0UL));
+}
+
 #define pkey_alloc_mask(pkey) (0x1 << pkey)
 
 #define mm_pkey_allocation_map(mm) (mm->context.pkey_allocation_map)

arch/powerpc/mm/hash_utils_64.c

@@ -233,6 +233,7 @@ unsigned long htab_convert_pte_flags(unsigned long pteflags)
 		 */
 		rflags |= HPTE_R_M;
 
+	rflags |= pte_to_hpte_pkey_bits(pteflags);
 	return rflags;
 }