| Message ID | 20220407103251.1209606-3-anshuman.khandual@arm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm/mmap: Drop arch_vm_get_page_prot() and arch_filter_pgprot() | expand |
Le 07/04/2022 à 12:32, Anshuman Khandual a écrit : > This defines and exports a platform specific custom vm_get_page_prot() via > subscribing ARCH_HAS_VM_GET_PAGE_PROT. While here, this also localizes > arch_vm_get_page_prot() as powerpc_vm_get_page_prot() and moves it near > vm_get_page_prot(). > > Cc: Michael Ellerman <mpe@ellerman.id.au> > Cc: Paul Mackerras <paulus@samba.org> > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > --- > arch/powerpc/Kconfig | 1 + > arch/powerpc/include/asm/mman.h | 12 ------------ > arch/powerpc/mm/mmap.c | 26 ++++++++++++++++++++++++++ > 3 files changed, 27 insertions(+), 12 deletions(-) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 174edabb74fa..eb9b6ddbf92f 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -140,6 +140,7 @@ config PPC > select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST > select ARCH_HAS_UACCESS_FLUSHCACHE > select ARCH_HAS_UBSAN_SANITIZE_ALL > + select ARCH_HAS_VM_GET_PAGE_PROT > select ARCH_HAVE_NMI_SAFE_CMPXCHG > select ARCH_KEEP_MEMBLOCK > select ARCH_MIGHT_HAVE_PC_PARPORT > diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h > index 7cb6d18f5cd6..1b024e64c8ec 100644 > --- a/arch/powerpc/include/asm/mman.h > +++ b/arch/powerpc/include/asm/mman.h > @@ -24,18 +24,6 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, > } > #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) > > -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) > -{ > -#ifdef CONFIG_PPC_MEM_KEYS > - return (vm_flags & VM_SAO) ? > - __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : > - __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); > -#else > - return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); > -#endif > -} > -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) > - > static inline bool arch_validate_prot(unsigned long prot, unsigned long addr) > { > if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO)) > diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c > index c475cf810aa8..cd17bd6fa36b 100644 > --- a/arch/powerpc/mm/mmap.c > +++ b/arch/powerpc/mm/mmap.c > @@ -254,3 +254,29 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) > mm->get_unmapped_area = arch_get_unmapped_area_topdown; > } > } > + > +#ifdef CONFIG_PPC64 > +static pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) > +{ > +#ifdef CONFIG_PPC_MEM_KEYS > + return (vm_flags & VM_SAO) ? > + __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : > + __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); > +#else > + return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); > +#endif > +} > +#else > +static pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) > +{ > + return __pgprot(0); > +} > +#endif /* CONFIG_PPC64 */ Can we reduce this forest of #ifdefs and make it more readable ? mm/mmap.c is going away with patch https://patchwork.ozlabs.org/project/linuxppc-dev/patch/d6d849621f821af253e777a24eda4c648814a76e.1646847562.git.christophe.leroy@csgroup.eu/ So it would be better to add two versions of vm_get_page_prot(), for instance one in mm/pgtable_64.c and one in mm/pgtable_32.c > + > +pgprot_t vm_get_page_prot(unsigned long vm_flags) > +{ > + return __pgprot(pgprot_val(protection_map[vm_flags & > + (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) | > + pgprot_val(powerpc_vm_get_page_prot(vm_flags))); > +} > +EXPORT_SYMBOL(vm_get_page_prot); By the way I'm a bit puzzled with the name powerpc_vm_get_page_prot(), the name suggests that it's just a powerpc replacement of vm_get_page_prot(). I'd prefer if it was named __vm_get_page_prot(), it would be clearer that it is a complement to vm_get_page_prot() and not a remplacement. Christophe
Le 08/04/2022 à 14:53, Christophe Leroy a écrit : > > > Le 07/04/2022 à 12:32, Anshuman Khandual a écrit : >> This defines and exports a platform specific custom vm_get_page_prot() >> via >> subscribing ARCH_HAS_VM_GET_PAGE_PROT. While here, this also localizes >> arch_vm_get_page_prot() as powerpc_vm_get_page_prot() and moves it near >> vm_get_page_prot(). >> >> Cc: Michael Ellerman <mpe@ellerman.id.au> >> Cc: Paul Mackerras <paulus@samba.org> >> Cc: linuxppc-dev@lists.ozlabs.org >> Cc: linux-kernel@vger.kernel.org >> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> >> --- >> arch/powerpc/Kconfig | 1 + >> arch/powerpc/include/asm/mman.h | 12 ------------ >> arch/powerpc/mm/mmap.c | 26 ++++++++++++++++++++++++++ >> 3 files changed, 27 insertions(+), 12 deletions(-) >> >> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig >> index 174edabb74fa..eb9b6ddbf92f 100644 >> --- a/arch/powerpc/Kconfig >> +++ b/arch/powerpc/Kconfig >> @@ -140,6 +140,7 @@ config PPC >> select ARCH_HAS_TICK_BROADCAST if >> GENERIC_CLOCKEVENTS_BROADCAST >> select ARCH_HAS_UACCESS_FLUSHCACHE >> select ARCH_HAS_UBSAN_SANITIZE_ALL >> + select ARCH_HAS_VM_GET_PAGE_PROT >> select ARCH_HAVE_NMI_SAFE_CMPXCHG >> select ARCH_KEEP_MEMBLOCK >> select ARCH_MIGHT_HAVE_PC_PARPORT >> diff --git a/arch/powerpc/include/asm/mman.h >> b/arch/powerpc/include/asm/mman.h >> index 7cb6d18f5cd6..1b024e64c8ec 100644 >> --- a/arch/powerpc/include/asm/mman.h >> +++ b/arch/powerpc/include/asm/mman.h >> @@ -24,18 +24,6 @@ static inline unsigned long >> arch_calc_vm_prot_bits(unsigned long prot, >> } >> #define arch_calc_vm_prot_bits(prot, pkey) >> arch_calc_vm_prot_bits(prot, pkey) >> -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) >> -{ >> -#ifdef CONFIG_PPC_MEM_KEYS >> - return (vm_flags & VM_SAO) ? >> - __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : >> - __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); >> -#else >> - return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); >> -#endif >> -} >> -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) >> - >> static inline bool arch_validate_prot(unsigned long prot, unsigned >> long addr) >> { >> if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | >> PROT_SAO)) >> diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c >> index c475cf810aa8..cd17bd6fa36b 100644 >> --- a/arch/powerpc/mm/mmap.c >> +++ b/arch/powerpc/mm/mmap.c >> @@ -254,3 +254,29 @@ void arch_pick_mmap_layout(struct mm_struct *mm, >> struct rlimit *rlim_stack) >> mm->get_unmapped_area = arch_get_unmapped_area_topdown; >> } >> } >> + >> +#ifdef CONFIG_PPC64 >> +static pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) >> +{ >> +#ifdef CONFIG_PPC_MEM_KEYS >> + return (vm_flags & VM_SAO) ? >> + __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : >> + __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); >> +#else >> + return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); >> +#endif >> +} >> +#else >> +static pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) >> +{ >> + return __pgprot(0); >> +} >> +#endif /* CONFIG_PPC64 */ > > Can we reduce this forest of #ifdefs and make it more readable ? > > mm/mmap.c is going away with patch > https://patchwork.ozlabs.org/project/linuxppc-dev/patch/d6d849621f821af253e777a24eda4c648814a76e.1646847562.git.christophe.leroy@csgroup.eu/ > > > So it would be better to add two versions of vm_get_page_prot(), for > instance one in mm/pgtable_64.c and one in mm/pgtable_32.c Indeed, you don't need anything at all for PPC32. All you need to do is select ARCH_HAS_VM_GET_PAGE_PROT if PPC64 And in fact it could even be PPC_BOOK3S_64 instead of PPC64 because CONFIG_PPC_MEM_KEYS depends on PPC_BOOK3S_64 and _PAGE_SAO is 0 on nohash/64. So you can then put it into arch/powerpc/mm/book3s64/pgtable.c > > >> + >> +pgprot_t vm_get_page_prot(unsigned long vm_flags) >> +{ >> + return __pgprot(pgprot_val(protection_map[vm_flags & >> + (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) | >> + pgprot_val(powerpc_vm_get_page_prot(vm_flags))); >> +} >> +EXPORT_SYMBOL(vm_get_page_prot); > > By the way I'm a bit puzzled with the name powerpc_vm_get_page_prot(), > the name suggests that it's just a powerpc replacement of > vm_get_page_prot(). I'd prefer if it was named __vm_get_page_prot(), it > would be clearer that it is a complement to vm_get_page_prot() and not a > remplacement. > > Christophe
On 4/9/22 17:06, Christophe Leroy wrote: > > > Le 08/04/2022 à 14:53, Christophe Leroy a écrit : >> >> >> Le 07/04/2022 à 12:32, Anshuman Khandual a écrit : >>> This defines and exports a platform specific custom vm_get_page_prot() via >>> subscribing ARCH_HAS_VM_GET_PAGE_PROT. While here, this also localizes >>> arch_vm_get_page_prot() as powerpc_vm_get_page_prot() and moves it near >>> vm_get_page_prot(). >>> >>> Cc: Michael Ellerman <mpe@ellerman.id.au> >>> Cc: Paul Mackerras <paulus@samba.org> >>> Cc: linuxppc-dev@lists.ozlabs.org >>> Cc: linux-kernel@vger.kernel.org >>> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> >>> --- >>> arch/powerpc/Kconfig | 1 + >>> arch/powerpc/include/asm/mman.h | 12 ------------ >>> arch/powerpc/mm/mmap.c | 26 ++++++++++++++++++++++++++ >>> 3 files changed, 27 insertions(+), 12 deletions(-) >>> >>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig >>> index 174edabb74fa..eb9b6ddbf92f 100644 >>> --- a/arch/powerpc/Kconfig >>> +++ b/arch/powerpc/Kconfig >>> @@ -140,6 +140,7 @@ config PPC >>> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST >>> select ARCH_HAS_UACCESS_FLUSHCACHE >>> select ARCH_HAS_UBSAN_SANITIZE_ALL >>> + select ARCH_HAS_VM_GET_PAGE_PROT >>> select ARCH_HAVE_NMI_SAFE_CMPXCHG >>> select ARCH_KEEP_MEMBLOCK >>> select ARCH_MIGHT_HAVE_PC_PARPORT >>> diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h >>> index 7cb6d18f5cd6..1b024e64c8ec 100644 >>> --- a/arch/powerpc/include/asm/mman.h >>> +++ b/arch/powerpc/include/asm/mman.h >>> @@ -24,18 +24,6 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, >>> } >>> #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) >>> -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) >>> -{ >>> -#ifdef CONFIG_PPC_MEM_KEYS >>> - return (vm_flags & VM_SAO) ? >>> - __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : >>> - __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); >>> -#else >>> - return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); >>> -#endif >>> -} >>> -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) >>> - >>> static inline bool arch_validate_prot(unsigned long prot, unsigned long addr) >>> { >>> if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO)) >>> diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c >>> index c475cf810aa8..cd17bd6fa36b 100644 >>> --- a/arch/powerpc/mm/mmap.c >>> +++ b/arch/powerpc/mm/mmap.c >>> @@ -254,3 +254,29 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) >>> mm->get_unmapped_area = arch_get_unmapped_area_topdown; >>> } >>> } >>> + >>> +#ifdef CONFIG_PPC64 >>> +static pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) >>> +{ >>> +#ifdef CONFIG_PPC_MEM_KEYS >>> + return (vm_flags & VM_SAO) ? >>> + __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : >>> + __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); >>> +#else >>> + return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); >>> +#endif >>> +} >>> +#else >>> +static pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) >>> +{ >>> + return __pgprot(0); >>> +} >>> +#endif /* CONFIG_PPC64 */ >> >> Can we reduce this forest of #ifdefs and make it more readable ? >> >> mm/mmap.c is going away with patch https://patchwork.ozlabs.org/project/linuxppc-dev/patch/d6d849621f821af253e777a24eda4c648814a76e.1646847562.git.christophe.leroy@csgroup.eu/ >> >> So it would be better to add two versions of vm_get_page_prot(), for instance one in mm/pgtable_64.c and one in mm/pgtable_32.c > > Indeed, you don't need anything at all for PPC32. All you need to do is > > select ARCH_HAS_VM_GET_PAGE_PROT if PPC64 > > And in fact it could even be PPC_BOOK3S_64 instead of PPC64 because CONFIG_PPC_MEM_KEYS depends on PPC_BOOK3S_64 and _PAGE_SAO is 0 on nohash/64. > > So you can then put it into arch/powerpc/mm/book3s64/pgtable.c Would something like the following change work ? diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index eb9b6ddbf92f..69e44358a235 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -140,7 +140,7 @@ config PPC select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UACCESS_FLUSHCACHE select ARCH_HAS_UBSAN_SANITIZE_ALL - select ARCH_HAS_VM_GET_PAGE_PROT + select ARCH_HAS_VM_GET_PAGE_PROT if PPC_BOOK3S_64 select ARCH_HAVE_NMI_SAFE_CMPXCHG select ARCH_KEEP_MEMBLOCK select ARCH_MIGHT_HAVE_PC_PARPORT diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index 052e6590f84f..59d235519b44 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -7,6 +7,7 @@ #include <linux/mm_types.h> #include <linux/memblock.h> #include <linux/memremap.h> +#include <linux/pkeys.h> #include <linux/debugfs.h> #include <misc/cxl-base.h> @@ -549,3 +550,22 @@ unsigned long memremap_compat_align(void) } EXPORT_SYMBOL_GPL(memremap_compat_align); #endif + +static pgprot_t __vm_get_page_prot(unsigned long vm_flags) +{ +#ifdef CONFIG_PPC_MEM_KEYS + return (vm_flags & VM_SAO) ? + __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : + __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); +#else + return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); +#endif +} + +pgprot_t vm_get_page_prot(unsigned long vm_flags) +{ + return __pgprot(pgprot_val(protection_map[vm_flags & + (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) | + pgprot_val(__vm_get_page_prot(vm_flags))); +} +EXPORT_SYMBOL(vm_get_page_prot);
Le 11/04/2022 à 07:31, Anshuman Khandual a écrit : > > > On 4/9/22 17:06, Christophe Leroy wrote: >> >> >> Le 08/04/2022 à 14:53, Christophe Leroy a écrit : >>> >>> >>> Le 07/04/2022 à 12:32, Anshuman Khandual a écrit : >>>> This defines and exports a platform specific custom vm_get_page_prot() via >>>> subscribing ARCH_HAS_VM_GET_PAGE_PROT. While here, this also localizes >>>> arch_vm_get_page_prot() as powerpc_vm_get_page_prot() and moves it near >>>> vm_get_page_prot(). >>>> >>>> Cc: Michael Ellerman <mpe@ellerman.id.au> >>>> Cc: Paul Mackerras <paulus@samba.org> >>>> Cc: linuxppc-dev@lists.ozlabs.org >>>> Cc: linux-kernel@vger.kernel.org >>>> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> >>>> --- >>>> arch/powerpc/Kconfig | 1 + >>>> arch/powerpc/include/asm/mman.h | 12 ------------ >>>> arch/powerpc/mm/mmap.c | 26 ++++++++++++++++++++++++++ >>>> 3 files changed, 27 insertions(+), 12 deletions(-) >>>> >>>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig >>>> index 174edabb74fa..eb9b6ddbf92f 100644 >>>> --- a/arch/powerpc/Kconfig >>>> +++ b/arch/powerpc/Kconfig >>>> @@ -140,6 +140,7 @@ config PPC >>>> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST >>>> select ARCH_HAS_UACCESS_FLUSHCACHE >>>> select ARCH_HAS_UBSAN_SANITIZE_ALL >>>> + select ARCH_HAS_VM_GET_PAGE_PROT >>>> select ARCH_HAVE_NMI_SAFE_CMPXCHG >>>> select ARCH_KEEP_MEMBLOCK >>>> select ARCH_MIGHT_HAVE_PC_PARPORT >>>> diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h >>>> index 7cb6d18f5cd6..1b024e64c8ec 100644 >>>> --- a/arch/powerpc/include/asm/mman.h >>>> +++ b/arch/powerpc/include/asm/mman.h >>>> @@ -24,18 +24,6 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, >>>> } >>>> #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) >>>> -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) >>>> -{ >>>> -#ifdef CONFIG_PPC_MEM_KEYS >>>> - return (vm_flags & VM_SAO) ? >>>> - __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : >>>> - __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); >>>> -#else >>>> - return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); >>>> -#endif >>>> -} >>>> -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) >>>> - >>>> static inline bool arch_validate_prot(unsigned long prot, unsigned long addr) >>>> { >>>> if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO)) >>>> diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c >>>> index c475cf810aa8..cd17bd6fa36b 100644 >>>> --- a/arch/powerpc/mm/mmap.c >>>> +++ b/arch/powerpc/mm/mmap.c >>>> @@ -254,3 +254,29 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) >>>> mm->get_unmapped_area = arch_get_unmapped_area_topdown; >>>> } >>>> } >>>> + >>>> +#ifdef CONFIG_PPC64 >>>> +static pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) >>>> +{ >>>> +#ifdef CONFIG_PPC_MEM_KEYS >>>> + return (vm_flags & VM_SAO) ? >>>> + __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : >>>> + __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); >>>> +#else >>>> + return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); >>>> +#endif >>>> +} >>>> +#else >>>> +static pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) >>>> +{ >>>> + return __pgprot(0); >>>> +} >>>> +#endif /* CONFIG_PPC64 */ >>> >>> Can we reduce this forest of #ifdefs and make it more readable ? >>> >>> mm/mmap.c is going away with patch https://patchwork.ozlabs.org/project/linuxppc-dev/patch/d6d849621f821af253e777a24eda4c648814a76e.1646847562.git.christophe.leroy@csgroup.eu/ >>> >>> So it would be better to add two versions of vm_get_page_prot(), for instance one in mm/pgtable_64.c and one in mm/pgtable_32.c >> >> Indeed, you don't need anything at all for PPC32. All you need to do is >> >> select ARCH_HAS_VM_GET_PAGE_PROT if PPC64 >> >> And in fact it could even be PPC_BOOK3S_64 instead of PPC64 because CONFIG_PPC_MEM_KEYS depends on PPC_BOOK3S_64 and _PAGE_SAO is 0 on nohash/64. >> >> So you can then put it into arch/powerpc/mm/book3s64/pgtable.c > > Would something like the following change work ? Yes that looks good to me. Thanks Christophe > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index eb9b6ddbf92f..69e44358a235 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -140,7 +140,7 @@ config PPC > select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST > select ARCH_HAS_UACCESS_FLUSHCACHE > select ARCH_HAS_UBSAN_SANITIZE_ALL > - select ARCH_HAS_VM_GET_PAGE_PROT > + select ARCH_HAS_VM_GET_PAGE_PROT if PPC_BOOK3S_64 > select ARCH_HAVE_NMI_SAFE_CMPXCHG > select ARCH_KEEP_MEMBLOCK > select ARCH_MIGHT_HAVE_PC_PARPORT > diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c > index 052e6590f84f..59d235519b44 100644 > --- a/arch/powerpc/mm/book3s64/pgtable.c > +++ b/arch/powerpc/mm/book3s64/pgtable.c > @@ -7,6 +7,7 @@ > #include <linux/mm_types.h> > #include <linux/memblock.h> > #include <linux/memremap.h> > +#include <linux/pkeys.h> > #include <linux/debugfs.h> > #include <misc/cxl-base.h> > > @@ -549,3 +550,22 @@ unsigned long memremap_compat_align(void) > } > EXPORT_SYMBOL_GPL(memremap_compat_align); > #endif > + > +static pgprot_t __vm_get_page_prot(unsigned long vm_flags) > +{ > +#ifdef CONFIG_PPC_MEM_KEYS > + return (vm_flags & VM_SAO) ? > + __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : > + __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); > +#else > + return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); > +#endif > +} > + > +pgprot_t vm_get_page_prot(unsigned long vm_flags) > +{ > + return __pgprot(pgprot_val(protection_map[vm_flags & > + (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) | > + pgprot_val(__vm_get_page_prot(vm_flags))); > +} > +EXPORT_SYMBOL(vm_get_page_prot);
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 174edabb74fa..eb9b6ddbf92f 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -140,6 +140,7 @@ config PPC select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UACCESS_FLUSHCACHE select ARCH_HAS_UBSAN_SANITIZE_ALL + select ARCH_HAS_VM_GET_PAGE_PROT select ARCH_HAVE_NMI_SAFE_CMPXCHG select ARCH_KEEP_MEMBLOCK select ARCH_MIGHT_HAVE_PC_PARPORT diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h index 7cb6d18f5cd6..1b024e64c8ec 100644 --- a/arch/powerpc/include/asm/mman.h +++ b/arch/powerpc/include/asm/mman.h @@ -24,18 +24,6 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, } #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) -{ -#ifdef CONFIG_PPC_MEM_KEYS - return (vm_flags & VM_SAO) ? - __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : - __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); -#else - return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); -#endif -} -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) - static inline bool arch_validate_prot(unsigned long prot, unsigned long addr) { if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO)) diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c index c475cf810aa8..cd17bd6fa36b 100644 --- a/arch/powerpc/mm/mmap.c +++ b/arch/powerpc/mm/mmap.c @@ -254,3 +254,29 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) mm->get_unmapped_area = arch_get_unmapped_area_topdown; } } + +#ifdef CONFIG_PPC64 +static pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) +{ +#ifdef CONFIG_PPC_MEM_KEYS + return (vm_flags & VM_SAO) ? + __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) : + __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags)); +#else + return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); +#endif +} +#else +static pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) +{ + return __pgprot(0); +} +#endif /* CONFIG_PPC64 */ + +pgprot_t vm_get_page_prot(unsigned long vm_flags) +{ + return __pgprot(pgprot_val(protection_map[vm_flags & + (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) | + pgprot_val(powerpc_vm_get_page_prot(vm_flags))); +} +EXPORT_SYMBOL(vm_get_page_prot);
This defines and exports a platform specific custom vm_get_page_prot() via subscribing ARCH_HAS_VM_GET_PAGE_PROT. While here, this also localizes arch_vm_get_page_prot() as powerpc_vm_get_page_prot() and moves it near vm_get_page_prot(). Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@samba.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/mman.h | 12 ------------ arch/powerpc/mm/mmap.c | 26 ++++++++++++++++++++++++++ 3 files changed, 27 insertions(+), 12 deletions(-)