| Message ID | 1504910713-7094-10-git-send-email-linuxram@us.ibm.com (mailing list archive) |
|---|---|
| State | Changes Requested |
| Headers | show |
| Series | [01/25] powerpc: initial pkey plumbing | expand |
On Fri, 8 Sep 2017 15:44:49 -0700 Ram Pai <linuxram@us.ibm.com> wrote: > Basic plumbing to initialize the pkey system. > Nothing is enabled yet. A later patch will enable it > ones all the infrastructure is in place. > > Signed-off-by: Ram Pai <linuxram@us.ibm.com> > --- > arch/powerpc/Kconfig | 16 +++++++++++ > arch/powerpc/include/asm/mmu_context.h | 5 +++ > arch/powerpc/include/asm/pkeys.h | 45 ++++++++++++++++++++++++++++++++ > arch/powerpc/kernel/setup_64.c | 4 +++ > arch/powerpc/mm/Makefile | 1 + > arch/powerpc/mm/hash_utils_64.c | 1 + > arch/powerpc/mm/pkeys.c | 33 +++++++++++++++++++++++ > 7 files changed, 105 insertions(+), 0 deletions(-) > create mode 100644 arch/powerpc/include/asm/pkeys.h > create mode 100644 arch/powerpc/mm/pkeys.c > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 9fc3c0b..a4cd210 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -864,6 +864,22 @@ config SECCOMP > > If unsure, say Y. Only embedded should say N here. > > +config PPC64_MEMORY_PROTECTION_KEYS > + prompt "PowerPC Memory Protection Keys" > + def_bool y > + # Note: only available in 64-bit mode > + depends on PPC64 This is not sufficient right, you need PPC_BOOK3S_64 for compile time at-least? > + select ARCH_USES_HIGH_VMA_FLAGS > + select ARCH_HAS_PKEYS > + ---help--- > + Memory Protection Keys provides a mechanism for enforcing > + page-based protections, but without requiring modification of the > + page tables when an application changes protection domains. > + > + For details, see Documentation/vm/protection-keys.txt > + > + If unsure, say y. > + > endmenu > > config ISA_DMA_API > diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h > index 3095925..7badf29 100644 > --- a/arch/powerpc/include/asm/mmu_context.h > +++ b/arch/powerpc/include/asm/mmu_context.h > @@ -141,5 +141,10 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, > /* by default, allow everything */ > return true; > } > + > +#ifndef CONFIG_PPC64_MEMORY_PROTECTION_KEYS > +#define pkey_initialize() > +#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */ > + > #endif /* __KERNEL__ */ > #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ > diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h > new file mode 100644 > index 0000000..c02305a > --- /dev/null > +++ b/arch/powerpc/include/asm/pkeys.h > @@ -0,0 +1,45 @@ > +#ifndef _ASM_PPC64_PKEYS_H > +#define _ASM_PPC64_PKEYS_H > + > +extern bool pkey_inited; > +extern bool pkey_execute_disable_support; > +#define ARCH_VM_PKEY_FLAGS 0 > + > +static inline bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey) > +{ > + return (pkey == 0); > +} > + > +static inline int mm_pkey_alloc(struct mm_struct *mm) > +{ > + return -1; > +} > + > +static inline int mm_pkey_free(struct mm_struct *mm, int pkey) > +{ > + return -EINVAL; > +} > + > +/* > + * Try to dedicate one of the protection keys to be used as an > + * execute-only protection key. > + */ > +static inline int execute_only_pkey(struct mm_struct *mm) > +{ > + return 0; > +} > + > +static inline int arch_override_mprotect_pkey(struct vm_area_struct *vma, > + int prot, int pkey) > +{ > + return 0; > +} > + > +static inline int arch_set_user_pkey_access(struct task_struct *tsk, int pkey, > + unsigned long init_val) > +{ > + return 0; > +} > + > +extern void pkey_initialize(void); > +#endif /*_ASM_PPC64_PKEYS_H */ > diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c > index b89c6aa..3b67014 100644 > --- a/arch/powerpc/kernel/setup_64.c > +++ b/arch/powerpc/kernel/setup_64.c > @@ -37,6 +37,7 @@ > #include <linux/memblock.h> > #include <linux/memory.h> > #include <linux/nmi.h> > +#include <linux/pkeys.h> > > #include <asm/io.h> > #include <asm/kdump.h> > @@ -316,6 +317,9 @@ void __init early_setup(unsigned long dt_ptr) > /* Initialize the hash table or TLB handling */ > early_init_mmu(); > > + /* initialize the key subsystem */ > + pkey_initialize(); > + > /* > * At this point, we can let interrupts switch to virtual mode > * (the MMU has been setup), so adjust the MSR in the PACA to > diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile > index fb844d2..927620a 100644 > --- a/arch/powerpc/mm/Makefile > +++ b/arch/powerpc/mm/Makefile > @@ -43,3 +43,4 @@ obj-$(CONFIG_PPC_COPRO_BASE) += copro_fault.o > obj-$(CONFIG_SPAPR_TCE_IOMMU) += mmu_context_iommu.o > obj-$(CONFIG_PPC_PTDUMP) += dump_linuxpagetables.o > obj-$(CONFIG_PPC_HTDUMP) += dump_hashpagetable.o > +obj-$(CONFIG_PPC64_MEMORY_PROTECTION_KEYS) += pkeys.o > diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c > index 0dff57b..67f62b5 100644 > --- a/arch/powerpc/mm/hash_utils_64.c > +++ b/arch/powerpc/mm/hash_utils_64.c > @@ -35,6 +35,7 @@ > #include <linux/memblock.h> > #include <linux/context_tracking.h> > #include <linux/libfdt.h> > +#include <linux/pkeys.h> > > #include <asm/debugfs.h> > #include <asm/processor.h> > diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c > new file mode 100644 > index 0000000..418a05b > --- /dev/null > +++ b/arch/powerpc/mm/pkeys.c > @@ -0,0 +1,33 @@ > +/* > + * PowerPC Memory Protection Keys management > + * Copyright (c) 2015, Intel Corporation. > + * Copyright (c) 2017, IBM Corporation. > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms and conditions of the GNU General Public License, > + * version 2, as published by the Free Software Foundation. > + * > + * This program is distributed in the hope it will be useful, but WITHOUT > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for > + * more details. > + */ > +#include <linux/pkeys.h> /* PKEY_* */ > + > +bool pkey_inited; > +bool pkey_execute_disable_support; > + > +void __init pkey_initialize(void) > +{ > + /* disable the pkey system till everything > + * is in place. A patch further down the > + * line will enable it. > + */ Comment style is broken > + pkey_inited = false; > + > + /* > + * disable execute_disable support for now. > + * A patch further down will enable it. > + */ > + pkey_execute_disable_support = false; > +} Balbir Singh.
On Thu, Sep 14, 2017 at 01:32:05PM +1000, Balbir Singh wrote: > On Fri, 8 Sep 2017 15:44:49 -0700 > Ram Pai <linuxram@us.ibm.com> wrote: > > > Basic plumbing to initialize the pkey system. > > Nothing is enabled yet. A later patch will enable it > > ones all the infrastructure is in place. > > > > Signed-off-by: Ram Pai <linuxram@us.ibm.com> > > --- > > arch/powerpc/Kconfig | 16 +++++++++++ > > arch/powerpc/include/asm/mmu_context.h | 5 +++ > > arch/powerpc/include/asm/pkeys.h | 45 ++++++++++++++++++++++++++++++++ > > arch/powerpc/kernel/setup_64.c | 4 +++ > > arch/powerpc/mm/Makefile | 1 + > > arch/powerpc/mm/hash_utils_64.c | 1 + > > arch/powerpc/mm/pkeys.c | 33 +++++++++++++++++++++++ > > 7 files changed, 105 insertions(+), 0 deletions(-) > > create mode 100644 arch/powerpc/include/asm/pkeys.h > > create mode 100644 arch/powerpc/mm/pkeys.c > > > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > > index 9fc3c0b..a4cd210 100644 > > --- a/arch/powerpc/Kconfig > > +++ b/arch/powerpc/Kconfig > > @@ -864,6 +864,22 @@ config SECCOMP > > > > If unsure, say Y. Only embedded should say N here. > > > > +config PPC64_MEMORY_PROTECTION_KEYS > > + prompt "PowerPC Memory Protection Keys" > > + def_bool y > > + # Note: only available in 64-bit mode > > + depends on PPC64 > > This is not sufficient right, you need PPC_BOOK3S_64 > for compile time at-least? Ok. Not thought too deep about this. Thanks for the input. > > > + select ARCH_USES_HIGH_VMA_FLAGS > > + ..... > > +void __init pkey_initialize(void) > > +{ > > + /* disable the pkey system till everything > > + * is in place. A patch further down the > > + * line will enable it. > > + */ > > Comment style is broken > checkpatch.pl does not complain. So is it really a broken comment style, or is it checkpatch.pl needs to be fixed? RP
Ram Pai <linuxram@us.ibm.com> writes: > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 9fc3c0b..a4cd210 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -864,6 +864,22 @@ config SECCOMP > > If unsure, say Y. Only embedded should say N here. > > +config PPC64_MEMORY_PROTECTION_KEYS That's pretty wordy, can we make it CONFIG_PPC_MEM_KEYS ? I think you're a sufficient vim wizard to search and replace all usages at once, if not I can do it before I apply the series. > + prompt "PowerPC Memory Protection Keys" > + def_bool y > + # Note: only available in 64-bit mode We don't need the note, that's exactly what the next line says: > + depends on PPC64 But shouldn't it be BOOK3S_64 ? I don't think it works on BookE does it? > + select ARCH_USES_HIGH_VMA_FLAGS > + select ARCH_HAS_PKEYS > + ---help--- I prefer just "help". > diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h > index 3095925..7badf29 100644 > --- a/arch/powerpc/include/asm/mmu_context.h > +++ b/arch/powerpc/include/asm/mmu_context.h > @@ -141,5 +141,10 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, > /* by default, allow everything */ > return true; > } > + > +#ifndef CONFIG_PPC64_MEMORY_PROTECTION_KEYS > +#define pkey_initialize() > +#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */ You don't need ifdefs around that. But you also don't need it (see below). > diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h > new file mode 100644 > index 0000000..c02305a > --- /dev/null > +++ b/arch/powerpc/include/asm/pkeys.h > @@ -0,0 +1,45 @@ > +#ifndef _ASM_PPC64_PKEYS_H > +#define _ASM_PPC64_PKEYS_H _ASM_POWERPC_KEYS_H Missing copyright header here. > + > +extern bool pkey_inited; > +extern bool pkey_execute_disable_support; > +#define ARCH_VM_PKEY_FLAGS 0 > + > +static inline bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey) > +{ > + return (pkey == 0); That means pkey 1 is not allocated and pkey 0 is? Surely this should just return false for now? > +} > + > +static inline int mm_pkey_alloc(struct mm_struct *mm) > +{ > + return -1; > +} > + > +static inline int mm_pkey_free(struct mm_struct *mm, int pkey) > +{ > + return -EINVAL; > +} > + > +/* > + * Try to dedicate one of the protection keys to be used as an > + * execute-only protection key. > + */ > +static inline int execute_only_pkey(struct mm_struct *mm) > +{ > + return 0; > +} > + > +static inline int arch_override_mprotect_pkey(struct vm_area_struct *vma, > + int prot, int pkey) static inline int arch_override_mprotect_pkey(struct vm_area_struct *vma, int prot, int pkey) > diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c > index b89c6aa..3b67014 100644 > --- a/arch/powerpc/kernel/setup_64.c > +++ b/arch/powerpc/kernel/setup_64.c > @@ -316,6 +317,9 @@ void __init early_setup(unsigned long dt_ptr) > /* Initialize the hash table or TLB handling */ > early_init_mmu(); > > + /* initialize the key subsystem */ > + pkey_initialize(); > + I'm not sure we need to initialise this that early, but if we do, it should be done in early_init_mmu(), not here. > diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c > index 0dff57b..67f62b5 100644 > --- a/arch/powerpc/mm/hash_utils_64.c > +++ b/arch/powerpc/mm/hash_utils_64.c > @@ -35,6 +35,7 @@ > #include <linux/memblock.h> > #include <linux/context_tracking.h> > #include <linux/libfdt.h> > +#include <linux/pkeys.h> This should go in a later patch when it's needed. > diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c > new file mode 100644 > index 0000000..418a05b > --- /dev/null > +++ b/arch/powerpc/mm/pkeys.c > @@ -0,0 +1,33 @@ > +/* > + * PowerPC Memory Protection Keys management > + * Copyright (c) 2015, Intel Corporation. Is any of it really copyright Intel? > + * Copyright (c) 2017, IBM Corporation. > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms and conditions of the GNU General Public License, > + * version 2, as published by the Free Software Foundation. We're meant to use "or later" on new code. > + * > + * This program is distributed in the hope it will be useful, but WITHOUT > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for > + * more details. But not this part. > + */ Blank line. > +#include <linux/pkeys.h> /* PKEY_* */ Comment is wrong and unnecessary. > +bool pkey_inited; > +bool pkey_execute_disable_support; > + > +void __init pkey_initialize(void) > +{ > + /* disable the pkey system till everything > + * is in place. A patch further down the > + * line will enable it. > + */ /* * Disable the pkey system till everything is in place. A patch * further down the line will enable it. */ I'm going to stop commenting on every badly formatted comment :) > + pkey_inited = false; > + > + /* > + * disable execute_disable support for now. > + * A patch further down will enable it. > + */ > + pkey_execute_disable_support = false; Those are both false anyway, so I'm not sure we really needed to initialise them to false again, but I don't feel that strongly about it. cheers
On Thu, Oct 19, 2017 at 03:20:36PM +1100, Michael Ellerman wrote: > Ram Pai <linuxram@us.ibm.com> writes: > > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > > index 9fc3c0b..a4cd210 100644 > > --- a/arch/powerpc/Kconfig > > +++ b/arch/powerpc/Kconfig > > @@ -864,6 +864,22 @@ config SECCOMP > > > > If unsure, say Y. Only embedded should say N here. > > > > +config PPC64_MEMORY_PROTECTION_KEYS > > That's pretty wordy, can we make it CONFIG_PPC_MEM_KEYS ? > > I think you're a sufficient vim wizard to search and replace all > usages at once, I take that as a compliment for now ;) > if not I can do it before I apply the series. Will change it...just that I was trying to keep it similar to what intel has X86_INTEL_MEMORY_PROTECTION_KEYS > > > + prompt "PowerPC Memory Protection Keys" > > + def_bool y > > + # Note: only available in 64-bit mode > > We don't need the note, that's exactly what the next line says: > > + depends on PPC64 > > But shouldn't it be BOOK3S_64 ? > > I don't think it works on BookE does it? > > > + select ARCH_USES_HIGH_VMA_FLAGS > > + select ARCH_HAS_PKEYS > > + ---help--- > > I prefer just "help". ok. > > > diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h > > index 3095925..7badf29 100644 > > --- a/arch/powerpc/include/asm/mmu_context.h > > +++ b/arch/powerpc/include/asm/mmu_context.h > > @@ -141,5 +141,10 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, > /* ....snip... > * Disable the pkey system till everything is in place. A patch > * further down the line will enable it. > */ > > I'm going to stop commenting on every badly formatted comment :) did not realize I had acquired a habit for badly formatted comments. :-( Sorry for causing the pain. Will fix it. RP
Ram Pai <linuxram@us.ibm.com> writes: > On Thu, Oct 19, 2017 at 03:20:36PM +1100, Michael Ellerman wrote: >> Ram Pai <linuxram@us.ibm.com> writes: >> >> > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig >> > index 9fc3c0b..a4cd210 100644 >> > --- a/arch/powerpc/Kconfig >> > +++ b/arch/powerpc/Kconfig >> > @@ -864,6 +864,22 @@ config SECCOMP >> > >> > If unsure, say Y. Only embedded should say N here. >> > >> > +config PPC64_MEMORY_PROTECTION_KEYS >> >> That's pretty wordy, can we make it CONFIG_PPC_MEM_KEYS ? >> >> I think you're a sufficient vim wizard to search and replace all >> usages at once, > > I take that as a compliment for now ;) > >> if not I can do it before I apply the series. > > Will change it...just that I was trying to keep it similar to what intel > has X86_INTEL_MEMORY_PROTECTION_KEYS Yeah I realise that's why you chose that name, but I'd still prefer something shorter. I don't think it matters that the CONFIG names are slightly different between the arches, it's still pretty clear what it's for I think. cheers
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 9fc3c0b..a4cd210 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -864,6 +864,22 @@ config SECCOMP If unsure, say Y. Only embedded should say N here. +config PPC64_MEMORY_PROTECTION_KEYS + prompt "PowerPC Memory Protection Keys" + def_bool y + # Note: only available in 64-bit mode + depends on PPC64 + select ARCH_USES_HIGH_VMA_FLAGS + select ARCH_HAS_PKEYS + ---help--- + Memory Protection Keys provides a mechanism for enforcing + page-based protections, but without requiring modification of the + page tables when an application changes protection domains. + + For details, see Documentation/vm/protection-keys.txt + + If unsure, say y. + endmenu config ISA_DMA_API diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h index 3095925..7badf29 100644 --- a/arch/powerpc/include/asm/mmu_context.h +++ b/arch/powerpc/include/asm/mmu_context.h @@ -141,5 +141,10 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, /* by default, allow everything */ return true; } + +#ifndef CONFIG_PPC64_MEMORY_PROTECTION_KEYS +#define pkey_initialize() +#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */ + #endif /* __KERNEL__ */ #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h new file mode 100644 index 0000000..c02305a --- /dev/null +++ b/arch/powerpc/include/asm/pkeys.h @@ -0,0 +1,45 @@ +#ifndef _ASM_PPC64_PKEYS_H +#define _ASM_PPC64_PKEYS_H + +extern bool pkey_inited; +extern bool pkey_execute_disable_support; +#define ARCH_VM_PKEY_FLAGS 0 + +static inline bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey) +{ + return (pkey == 0); +} + +static inline int mm_pkey_alloc(struct mm_struct *mm) +{ + return -1; +} + +static inline int mm_pkey_free(struct mm_struct *mm, int pkey) +{ + return -EINVAL; +} + +/* + * Try to dedicate one of the protection keys to be used as an + * execute-only protection key. + */ +static inline int execute_only_pkey(struct mm_struct *mm) +{ + return 0; +} + +static inline int arch_override_mprotect_pkey(struct vm_area_struct *vma, + int prot, int pkey) +{ + return 0; +} + +static inline int arch_set_user_pkey_access(struct task_struct *tsk, int pkey, + unsigned long init_val) +{ + return 0; +} + +extern void pkey_initialize(void); +#endif /*_ASM_PPC64_PKEYS_H */ diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index b89c6aa..3b67014 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -37,6 +37,7 @@ #include <linux/memblock.h> #include <linux/memory.h> #include <linux/nmi.h> +#include <linux/pkeys.h> #include <asm/io.h> #include <asm/kdump.h> @@ -316,6 +317,9 @@ void __init early_setup(unsigned long dt_ptr) /* Initialize the hash table or TLB handling */ early_init_mmu(); + /* initialize the key subsystem */ + pkey_initialize(); + /* * At this point, we can let interrupts switch to virtual mode * (the MMU has been setup), so adjust the MSR in the PACA to diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile index fb844d2..927620a 100644 --- a/arch/powerpc/mm/Makefile +++ b/arch/powerpc/mm/Makefile @@ -43,3 +43,4 @@ obj-$(CONFIG_PPC_COPRO_BASE) += copro_fault.o obj-$(CONFIG_SPAPR_TCE_IOMMU) += mmu_context_iommu.o obj-$(CONFIG_PPC_PTDUMP) += dump_linuxpagetables.o obj-$(CONFIG_PPC_HTDUMP) += dump_hashpagetable.o +obj-$(CONFIG_PPC64_MEMORY_PROTECTION_KEYS) += pkeys.o diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 0dff57b..67f62b5 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -35,6 +35,7 @@ #include <linux/memblock.h> #include <linux/context_tracking.h> #include <linux/libfdt.h> +#include <linux/pkeys.h> #include <asm/debugfs.h> #include <asm/processor.h> diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c new file mode 100644 index 0000000..418a05b --- /dev/null +++ b/arch/powerpc/mm/pkeys.c @@ -0,0 +1,33 @@ +/* + * PowerPC Memory Protection Keys management + * Copyright (c) 2015, Intel Corporation. + * Copyright (c) 2017, IBM Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ +#include <linux/pkeys.h> /* PKEY_* */ + +bool pkey_inited; +bool pkey_execute_disable_support; + +void __init pkey_initialize(void) +{ + /* disable the pkey system till everything + * is in place. A patch further down the + * line will enable it. + */ + pkey_inited = false; + + /* + * disable execute_disable support for now. + * A patch further down will enable it. + */ + pkey_execute_disable_support = false; +}
Basic plumbing to initialize the pkey system. Nothing is enabled yet. A later patch will enable it ones all the infrastructure is in place. Signed-off-by: Ram Pai <linuxram@us.ibm.com> --- arch/powerpc/Kconfig | 16 +++++++++++ arch/powerpc/include/asm/mmu_context.h | 5 +++ arch/powerpc/include/asm/pkeys.h | 45 ++++++++++++++++++++++++++++++++ arch/powerpc/kernel/setup_64.c | 4 +++ arch/powerpc/mm/Makefile | 1 + arch/powerpc/mm/hash_utils_64.c | 1 + arch/powerpc/mm/pkeys.c | 33 +++++++++++++++++++++++ 7 files changed, 105 insertions(+), 0 deletions(-) create mode 100644 arch/powerpc/include/asm/pkeys.h create mode 100644 arch/powerpc/mm/pkeys.c