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

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