[PATCH v6 03/22] powerpc/book3s64/kuap/kuep: Make KUAP and KUEP a subfeature of PPC_MEM_KEYS
Christophe Leroy
christophe.leroy at csgroup.eu
Thu Nov 26 00:30:31 AEDT 2020
Le 25/11/2020 à 06:16, Aneesh Kumar K.V a écrit :
> The next set of patches adds support for kuap with hash translation.
> Hence make KUAP a BOOK3S_64 feature. Also make it a subfeature of
> PPC_MEM_KEYS. Hash translation is going to use pkeys to support
> KUAP/KUEP. Adding this dependency reduces the code complexity and
> enables us to move some of the initialization code to pkeys.c
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>
> ---
> .../powerpc/include/asm/book3s/64/kup-radix.h | 4 ++--
> arch/powerpc/include/asm/book3s/64/mmu.h | 2 +-
> arch/powerpc/include/asm/ptrace.h | 7 +++++-
> arch/powerpc/kernel/asm-offsets.c | 3 +++
> arch/powerpc/mm/book3s64/Makefile | 2 +-
> arch/powerpc/mm/book3s64/pkeys.c | 24 ++++++++++++-------
> arch/powerpc/platforms/Kconfig.cputype | 5 ++++
> 7 files changed, 33 insertions(+), 14 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/book3s/64/kup-radix.h b/arch/powerpc/include/asm/book3s/64/kup-radix.h
> index 28716e2f13e3..68eaa2fac3ab 100644
> --- a/arch/powerpc/include/asm/book3s/64/kup-radix.h
> +++ b/arch/powerpc/include/asm/book3s/64/kup-radix.h
> @@ -16,7 +16,7 @@
> #ifdef CONFIG_PPC_KUAP
> BEGIN_MMU_FTR_SECTION_NESTED(67)
> mfspr \gpr1, SPRN_AMR
> - ld \gpr2, STACK_REGS_KUAP(r1)
> + ld \gpr2, STACK_REGS_AMR(r1)
> cmpd \gpr1, \gpr2
> beq 998f
> isync
> @@ -48,7 +48,7 @@
> bne \msr_pr_cr, 99f
> .endif
> mfspr \gpr1, SPRN_AMR
> - std \gpr1, STACK_REGS_KUAP(r1)
> + std \gpr1, STACK_REGS_AMR(r1)
> li \gpr2, (AMR_KUAP_BLOCKED >> AMR_KUAP_SHIFT)
> sldi \gpr2, \gpr2, AMR_KUAP_SHIFT
> cmpd \use_cr, \gpr1, \gpr2
> diff --git a/arch/powerpc/include/asm/book3s/64/mmu.h b/arch/powerpc/include/asm/book3s/64/mmu.h
> index e0b52940e43c..a2a015066bae 100644
> --- a/arch/powerpc/include/asm/book3s/64/mmu.h
> +++ b/arch/powerpc/include/asm/book3s/64/mmu.h
> @@ -199,7 +199,7 @@ extern int mmu_io_psize;
> void mmu_early_init_devtree(void);
> void hash__early_init_devtree(void);
> void radix__early_init_devtree(void);
> -#ifdef CONFIG_PPC_MEM_KEYS
> +#ifdef CONFIG_PPC_PKEY
> void pkey_early_init_devtree(void);
> #else
> static inline void pkey_early_init_devtree(void) {}
> diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
> index e2c778c176a3..e7f1caa007a4 100644
> --- a/arch/powerpc/include/asm/ptrace.h
> +++ b/arch/powerpc/include/asm/ptrace.h
> @@ -53,9 +53,14 @@ struct pt_regs
> #ifdef CONFIG_PPC64
> unsigned long ppr;
> #endif
> + union {
> #ifdef CONFIG_PPC_KUAP
> - unsigned long kuap;
> + unsigned long kuap;
> #endif
> +#ifdef CONFIG_PPC_PKEY
> + unsigned long amr;
> +#endif
> + };
> };
> unsigned long __pad[2]; /* Maintain 16 byte interrupt stack alignment */
> };
> diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
> index c2722ff36e98..418a0b314a33 100644
> --- a/arch/powerpc/kernel/asm-offsets.c
> +++ b/arch/powerpc/kernel/asm-offsets.c
> @@ -354,6 +354,9 @@ int main(void)
> STACK_PT_REGS_OFFSET(_PPR, ppr);
> #endif /* CONFIG_PPC64 */
>
> +#ifdef CONFIG_PPC_PKEY
> + STACK_PT_REGS_OFFSET(STACK_REGS_AMR, amr);
> +#endif
> #ifdef CONFIG_PPC_KUAP
> STACK_PT_REGS_OFFSET(STACK_REGS_KUAP, kuap);
> #endif
> diff --git a/arch/powerpc/mm/book3s64/Makefile b/arch/powerpc/mm/book3s64/Makefile
> index fd393b8be14f..1b56d3af47d4 100644
> --- a/arch/powerpc/mm/book3s64/Makefile
> +++ b/arch/powerpc/mm/book3s64/Makefile
> @@ -17,7 +17,7 @@ endif
> obj-$(CONFIG_TRANSPARENT_HUGEPAGE) += hash_hugepage.o
> obj-$(CONFIG_PPC_SUBPAGE_PROT) += subpage_prot.o
> obj-$(CONFIG_SPAPR_TCE_IOMMU) += iommu_api.o
> -obj-$(CONFIG_PPC_MEM_KEYS) += pkeys.o
> +obj-$(CONFIG_PPC_PKEY) += pkeys.o
>
> # Instrumenting the SLB fault path can lead to duplicate SLB entries
> KCOV_INSTRUMENT_slb.o := n
> diff --git a/arch/powerpc/mm/book3s64/pkeys.c b/arch/powerpc/mm/book3s64/pkeys.c
> index b1d091a97611..7dc71f85683d 100644
> --- a/arch/powerpc/mm/book3s64/pkeys.c
> +++ b/arch/powerpc/mm/book3s64/pkeys.c
> @@ -89,12 +89,14 @@ static int scan_pkey_feature(void)
> }
> }
>
> +#ifdef CONFIG_PPC_MEM_KEYS
> /*
> * Adjust the upper limit, based on the number of bits supported by
> * arch-neutral code.
> */
> pkeys_total = min_t(int, pkeys_total,
> ((ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT) + 1));
I don't think we need an #ifdef here. I thing an 'if (IS_ENABLED(CONFIG_PPC_MEM_KEYS))' should make it.
> +#endif
> return pkeys_total;
> }
>
> @@ -102,6 +104,7 @@ void __init pkey_early_init_devtree(void)
> {
> int pkeys_total, i;
>
> +#ifdef CONFIG_PPC_MEM_KEYS
> /*
> * We define PKEY_DISABLE_EXECUTE in addition to the arch-neutral
> * generic defines for PKEY_DISABLE_ACCESS and PKEY_DISABLE_WRITE.
> @@ -117,7 +120,7 @@ void __init pkey_early_init_devtree(void)
> BUILD_BUG_ON(__builtin_clzl(ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT) +
> __builtin_popcountl(ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT)
> != (sizeof(u64) * BITS_PER_BYTE));
> -
> +#endif
> /*
> * Only P7 and above supports SPRN_AMR update with MSR[PR] = 1
> */
> @@ -223,14 +226,6 @@ void __init pkey_early_init_devtree(void)
> return;
> }
>
> -void pkey_mm_init(struct mm_struct *mm)
> -{
> - if (!mmu_has_feature(MMU_FTR_PKEY))
> - return;
> - mm_pkey_allocation_map(mm) = initial_allocation_mask;
> - mm->context.execute_only_pkey = execute_only_key;
> -}
> -
> static inline u64 read_amr(void)
> {
> return mfspr(SPRN_AMR);
> @@ -257,6 +252,15 @@ static inline void write_iamr(u64 value)
> mtspr(SPRN_IAMR, value);
> }
>
> +#ifdef CONFIG_PPC_MEM_KEYS
> +void pkey_mm_init(struct mm_struct *mm)
> +{
> + if (!mmu_has_feature(MMU_FTR_PKEY))
> + return;
> + mm_pkey_allocation_map(mm) = initial_allocation_mask;
> + mm->context.execute_only_pkey = execute_only_key;
> +}
> +
> static inline void init_amr(int pkey, u8 init_bits)
> {
> u64 new_amr_bits = (((u64)init_bits & 0x3UL) << pkeyshift(pkey));
> @@ -445,3 +449,5 @@ void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm)
> mm_pkey_allocation_map(mm) = mm_pkey_allocation_map(oldmm);
> mm->context.execute_only_pkey = oldmm->context.execute_only_pkey;
> }
> +
> +#endif /* CONFIG_PPC_MEM_KEYS */
> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
> index c194c4ae8bc7..f255e8f32155 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -395,6 +395,11 @@ config PPC_KUAP_DEBUG
> Add extra debugging for Kernel Userspace Access Protection (KUAP)
> If you're unsure, say N.
>
> +config PPC_PKEY
> + def_bool y
> + depends on PPC_BOOK3S_64
> + depends on PPC_MEM_KEYS || PPC_KUAP || PPC_KUEP
> +
> config ARCH_ENABLE_HUGEPAGE_MIGRATION
> def_bool y
> depends on PPC_BOOK3S_64 && HUGETLB_PAGE && MIGRATION
>
More information about the Linuxppc-dev
mailing list