[RFC,v6,26/62] powerpc: Program HPTE key protection bits

Message ID 1500177424-13695-27-git-send-email-linuxram@us.ibm.com
State RFC
Headers show

Commit Message

Ram Pai July 16, 2017, 3:56 a.m.
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(-)

Comments

Aneesh Kumar K.V July 20, 2017, 6:28 a.m. | #1
Ram Pai <linuxram@us.ibm.com> writes:

> Map the PTE protection key bits to the HPTE key protection bits,
> while creating HPTE  entries.
>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

> 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

Patch

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;
 }