| Message ID | 20220603101411.488970-2-anshuman.khandual@arm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm/mmap: Enable more platforms with ARCH_HAS_VM_GET_PAGE_PROT | expand |
Le 03/06/2022 à 12:14, Anshuman Khandual a écrit : > Restrict generic protection_map[] array visibility only for platforms which > do not enable ARCH_HAS_VM_GET_PAGE_PROT. For other platforms that do define > their own vm_get_page_prot() enabling ARCH_HAS_VM_GET_PAGE_PROT, could have > their private static protection_map[] still implementing an array look up. > These private protection_map[] array could do without __PXXX/__SXXX macros, > making them redundant and dropping them off. > > But platforms which do not define their custom vm_get_page_prot() enabling > ARCH_HAS_VM_GET_PAGE_PROT, will still have to provide __PXXX/__SXXX macros. > Although this now provides a method for other willing platforms to drop off > __PXXX/__SXX macros completely. > > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Will Deacon <will@kernel.org> > Cc: Michael Ellerman <mpe@ellerman.id.au> > Cc: Paul Mackerras <paulus@samba.org> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Ingo Molnar <mingo@redhat.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: x86@kernel.org > Cc: linux-arm-kernel@lists.infradead.org > Cc: linuxppc-dev@lists.ozlabs.org > Cc: sparclinux@vger.kernel.org > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > --- > arch/arm64/include/asm/pgtable-prot.h | 18 ------------------ > arch/arm64/mm/mmap.c | 21 +++++++++++++++++++++ > arch/powerpc/include/asm/pgtable.h | 2 ++ > arch/powerpc/mm/book3s64/pgtable.c | 20 ++++++++++++++++++++ > arch/sparc/include/asm/pgtable_32.h | 2 ++ > arch/sparc/include/asm/pgtable_64.h | 19 ------------------- > arch/sparc/mm/init_64.c | 20 ++++++++++++++++++++ > arch/x86/include/asm/pgtable_types.h | 19 ------------------- > arch/x86/mm/pgprot.c | 19 +++++++++++++++++++ > include/linux/mm.h | 2 ++ > mm/mmap.c | 2 +- > 11 files changed, 87 insertions(+), 57 deletions(-) > > diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h > index d564d0ecd4cd..8ed2a80c896e 100644 > --- a/arch/powerpc/include/asm/pgtable.h > +++ b/arch/powerpc/include/asm/pgtable.h > @@ -21,6 +21,7 @@ struct mm_struct; > #endif /* !CONFIG_PPC_BOOK3S */ > > /* Note due to the way vm flags are laid out, the bits are XWR */ > +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT Ok, so until now it was common to all powerpc platforms. Now you define a different way whether it is a PPC_BOOK3S_64 or another platform ? What's the point ? > #define __P000 PAGE_NONE > #define __P001 PAGE_READONLY > #define __P010 PAGE_COPY > @@ -38,6 +39,7 @@ struct mm_struct; > #define __S101 PAGE_READONLY_X > #define __S110 PAGE_SHARED_X > #define __S111 PAGE_SHARED_X > +#endif > > #ifndef __ASSEMBLY__ > > diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c > index 7b9966402b25..2cf10a17c0a9 100644 > --- a/arch/powerpc/mm/book3s64/pgtable.c > +++ b/arch/powerpc/mm/book3s64/pgtable.c > @@ -551,6 +551,26 @@ unsigned long memremap_compat_align(void) > EXPORT_SYMBOL_GPL(memremap_compat_align); > #endif > > +/* Note due to the way vm flags are laid out, the bits are XWR */ > +static pgprot_t protection_map[16] __ro_after_init = { I don't think powerpc modifies that at all. Could be const instead of ro_after_init. > + [VM_NONE] = PAGE_NONE, > + [VM_READ] = PAGE_READONLY, > + [VM_WRITE] = PAGE_COPY, > + [VM_WRITE | VM_READ] = PAGE_COPY, > + [VM_EXEC] = PAGE_READONLY_X, > + [VM_EXEC | VM_READ] = PAGE_READONLY_X, > + [VM_EXEC | VM_WRITE] = PAGE_COPY_X, > + [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_X, > + [VM_SHARED] = PAGE_NONE, > + [VM_SHARED | VM_READ] = PAGE_READONLY, > + [VM_SHARED | VM_WRITE] = PAGE_SHARED, > + [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, > + [VM_SHARED | VM_EXEC] = PAGE_READONLY_X, > + [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_X, > + [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_X, > + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_X > +}; That's nice but it could apply to all powerpc platforms. Why restrict it to book3s/64 ? > + > pgprot_t vm_get_page_prot(unsigned long vm_flags) > { > unsigned long prot = pgprot_val(protection_map[vm_flags & > diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h > index 4866625da314..bca98b280fdd 100644 > --- a/arch/sparc/include/asm/pgtable_32.h > +++ b/arch/sparc/include/asm/pgtable_32.h > @@ -65,6 +65,7 @@ void paging_init(void); > extern unsigned long ptr_in_current_pgd; > > /* xwr */ > +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT CONFIG_ARCH_HAS_VM_GET_PAGE_PROT is selected by sparc64 only, is that ifdef needed at all ? > #define __P000 PAGE_NONE > #define __P001 PAGE_READONLY > #define __P010 PAGE_COPY > @@ -82,6 +83,7 @@ extern unsigned long ptr_in_current_pgd; > #define __S101 PAGE_READONLY > #define __S110 PAGE_SHARED > #define __S111 PAGE_SHARED > +#endif > > /* First physical page can be anywhere, the following is needed so that > * va-->pa and vice versa conversions work properly without performance > diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h > index 4679e45c8348..a779418ceba9 100644 > --- a/arch/sparc/include/asm/pgtable_64.h > +++ b/arch/sparc/include/asm/pgtable_64.h > @@ -187,25 +187,6 @@ bool kern_addr_valid(unsigned long addr); > #define _PAGE_SZHUGE_4U _PAGE_SZ4MB_4U > #define _PAGE_SZHUGE_4V _PAGE_SZ4MB_4V > > -/* These are actually filled in at boot time by sun4{u,v}_pgprot_init() */ > -#define __P000 __pgprot(0) > -#define __P001 __pgprot(0) > -#define __P010 __pgprot(0) > -#define __P011 __pgprot(0) > -#define __P100 __pgprot(0) > -#define __P101 __pgprot(0) > -#define __P110 __pgprot(0) > -#define __P111 __pgprot(0) > - > -#define __S000 __pgprot(0) > -#define __S001 __pgprot(0) > -#define __S010 __pgprot(0) > -#define __S011 __pgprot(0) > -#define __S100 __pgprot(0) > -#define __S101 __pgprot(0) > -#define __S110 __pgprot(0) > -#define __S111 __pgprot(0) > - > #ifndef __ASSEMBLY__ > > pte_t mk_pte_io(unsigned long, pgprot_t, int, unsigned long); > diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c > index f6174df2d5af..6edc2a68b73c 100644 > --- a/arch/sparc/mm/init_64.c > +++ b/arch/sparc/mm/init_64.c > @@ -2634,6 +2634,26 @@ void vmemmap_free(unsigned long start, unsigned long end, > } > #endif /* CONFIG_SPARSEMEM_VMEMMAP */ > > +/* These are actually filled in at boot time by sun4{u,v}_pgprot_init() */ > +static pgprot_t protection_map[16] __ro_after_init = { > + [VM_NONE] = __pgprot(0), > + [VM_READ] = __pgprot(0), > + [VM_WRITE] = __pgprot(0), > + [VM_WRITE | VM_READ] = __pgprot(0), > + [VM_EXEC] = __pgprot(0), > + [VM_EXEC | VM_READ] = __pgprot(0), > + [VM_EXEC | VM_WRITE] = __pgprot(0), > + [VM_EXEC | VM_WRITE | VM_READ] = __pgprot(0), > + [VM_SHARED] = __pgprot(0), > + [VM_SHARED | VM_READ] = __pgprot(0), > + [VM_SHARED | VM_WRITE] = __pgprot(0), > + [VM_SHARED | VM_WRITE | VM_READ] = __pgprot(0), > + [VM_SHARED | VM_EXEC] = __pgprot(0), > + [VM_SHARED | VM_EXEC | VM_READ] = __pgprot(0), > + [VM_SHARED | VM_EXEC | VM_WRITE] = __pgprot(0), > + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __pgprot(0) > +}; __pgprot(0) is 0 so you don't need to initialise the fields at all, it is zeroized at startup as part of BSS section. > + > static void prot_init_common(unsigned long page_none, > unsigned long page_shared, > unsigned long page_copy, > diff --git a/include/linux/mm.h b/include/linux/mm.h > index bc8f326be0ce..2254c1980c8e 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -420,11 +420,13 @@ extern unsigned int kobjsize(const void *objp); > #endif > #define VM_FLAGS_CLEAR (ARCH_VM_PKEY_FLAGS | VM_ARCH_CLEAR) > > +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > /* > * mapping from the currently active vm_flags protection bits (the > * low four bits) to a page protection mask.. > */ > extern pgprot_t protection_map[16]; > +#endif > > /* > * The default fault flags that should be used by most of the > diff --git a/mm/mmap.c b/mm/mmap.c > index 61e6135c54ef..e66920414945 100644 > --- a/mm/mmap.c > +++ b/mm/mmap.c > @@ -101,6 +101,7 @@ static void unmap_region(struct mm_struct *mm, > * w: (no) no > * x: (yes) yes > */ > +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > pgprot_t protection_map[16] __ro_after_init = { > [VM_NONE] = __P000, > [VM_READ] = __P001, > @@ -120,7 +121,6 @@ pgprot_t protection_map[16] __ro_after_init = { > [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __S111 > }; > > -#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT Why not let architectures provide their protection_map[] and keep that function ? > pgprot_t vm_get_page_prot(unsigned long vm_flags) > { > return protection_map[vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
On 6/3/22 17:48, Christophe Leroy wrote: > > > Le 03/06/2022 à 12:14, Anshuman Khandual a écrit : >> Restrict generic protection_map[] array visibility only for platforms which >> do not enable ARCH_HAS_VM_GET_PAGE_PROT. For other platforms that do define >> their own vm_get_page_prot() enabling ARCH_HAS_VM_GET_PAGE_PROT, could have >> their private static protection_map[] still implementing an array look up. >> These private protection_map[] array could do without __PXXX/__SXXX macros, >> making them redundant and dropping them off. >> >> But platforms which do not define their custom vm_get_page_prot() enabling >> ARCH_HAS_VM_GET_PAGE_PROT, will still have to provide __PXXX/__SXXX macros. >> Although this now provides a method for other willing platforms to drop off >> __PXXX/__SXX macros completely. >> >> Cc: Catalin Marinas <catalin.marinas@arm.com> >> Cc: Will Deacon <will@kernel.org> >> Cc: Michael Ellerman <mpe@ellerman.id.au> >> Cc: Paul Mackerras <paulus@samba.org> >> Cc: "David S. Miller" <davem@davemloft.net> >> Cc: Thomas Gleixner <tglx@linutronix.de> >> Cc: Ingo Molnar <mingo@redhat.com> >> Cc: Andrew Morton <akpm@linux-foundation.org> >> Cc: x86@kernel.org >> Cc: linux-arm-kernel@lists.infradead.org >> Cc: linuxppc-dev@lists.ozlabs.org >> Cc: sparclinux@vger.kernel.org >> Cc: linux-mm@kvack.org >> Cc: linux-kernel@vger.kernel.org >> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> >> --- >> arch/arm64/include/asm/pgtable-prot.h | 18 ------------------ >> arch/arm64/mm/mmap.c | 21 +++++++++++++++++++++ >> arch/powerpc/include/asm/pgtable.h | 2 ++ >> arch/powerpc/mm/book3s64/pgtable.c | 20 ++++++++++++++++++++ >> arch/sparc/include/asm/pgtable_32.h | 2 ++ >> arch/sparc/include/asm/pgtable_64.h | 19 ------------------- >> arch/sparc/mm/init_64.c | 20 ++++++++++++++++++++ >> arch/x86/include/asm/pgtable_types.h | 19 ------------------- >> arch/x86/mm/pgprot.c | 19 +++++++++++++++++++ >> include/linux/mm.h | 2 ++ >> mm/mmap.c | 2 +- >> 11 files changed, 87 insertions(+), 57 deletions(-) >> > >> diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h >> index d564d0ecd4cd..8ed2a80c896e 100644 >> --- a/arch/powerpc/include/asm/pgtable.h >> +++ b/arch/powerpc/include/asm/pgtable.h >> @@ -21,6 +21,7 @@ struct mm_struct; >> #endif /* !CONFIG_PPC_BOOK3S */ >> >> /* Note due to the way vm flags are laid out, the bits are XWR */ >> +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > > Ok, so until now it was common to all powerpc platforms. Now you define > a different way whether it is a PPC_BOOK3S_64 or another platform ? > What's the point ? On powerpc, select ARCH_HAS_VM_GET_PAGE_PROT if PPC_BOOK3S_64 Currently protection_map[] which requires __PXXX/__SXXX macros, is applicable on all platforms, irrespective whether they enable ARCH_HAS_VM_GET_PAGE_PROT or not. But because protection_map[] is being made private for ARCH_HAS_VM_GET_PAGE_PROT enabling platforms, they will not require __PXXX/__SXXX macros anymore. In this case, PPC_BOOK3S_64 does not require the macros anymore, where as other powerpc platforms will still require them as they depend on the generic protection_map[]. > >> #define __P000 PAGE_NONE >> #define __P001 PAGE_READONLY >> #define __P010 PAGE_COPY >> @@ -38,6 +39,7 @@ struct mm_struct; >> #define __S101 PAGE_READONLY_X >> #define __S110 PAGE_SHARED_X >> #define __S111 PAGE_SHARED_X >> +#endif >> >> #ifndef __ASSEMBLY__ >> >> diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c >> index 7b9966402b25..2cf10a17c0a9 100644 >> --- a/arch/powerpc/mm/book3s64/pgtable.c >> +++ b/arch/powerpc/mm/book3s64/pgtable.c >> @@ -551,6 +551,26 @@ unsigned long memremap_compat_align(void) >> EXPORT_SYMBOL_GPL(memremap_compat_align); >> #endif >> >> +/* Note due to the way vm flags are laid out, the bits are XWR */ >> +static pgprot_t protection_map[16] __ro_after_init = { > > I don't think powerpc modifies that at all. Could be const instead of > ro_after_init. Sure, will change that. > >> + [VM_NONE] = PAGE_NONE, >> + [VM_READ] = PAGE_READONLY, >> + [VM_WRITE] = PAGE_COPY, >> + [VM_WRITE | VM_READ] = PAGE_COPY, >> + [VM_EXEC] = PAGE_READONLY_X, >> + [VM_EXEC | VM_READ] = PAGE_READONLY_X, >> + [VM_EXEC | VM_WRITE] = PAGE_COPY_X, >> + [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_X, >> + [VM_SHARED] = PAGE_NONE, >> + [VM_SHARED | VM_READ] = PAGE_READONLY, >> + [VM_SHARED | VM_WRITE] = PAGE_SHARED, >> + [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, >> + [VM_SHARED | VM_EXEC] = PAGE_READONLY_X, >> + [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_X, >> + [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_X, >> + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_X >> +}; > > That's nice but it could apply to all powerpc platforms. Why restrict it > to book3s/64 ? Because as mentioned earlier, others powerpc platforms do not enable ARCH_HAS_VM_GET_PAGE_PROT. > >> + >> pgprot_t vm_get_page_prot(unsigned long vm_flags) >> { >> unsigned long prot = pgprot_val(protection_map[vm_flags & >> diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h >> index 4866625da314..bca98b280fdd 100644 >> --- a/arch/sparc/include/asm/pgtable_32.h >> +++ b/arch/sparc/include/asm/pgtable_32.h >> @@ -65,6 +65,7 @@ void paging_init(void); >> extern unsigned long ptr_in_current_pgd; >> >> /* xwr */ >> +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > > CONFIG_ARCH_HAS_VM_GET_PAGE_PROT is selected by sparc64 only, is that > ifdef needed at all ? Not really necessary, but added just to tighten up. > >> #define __P000 PAGE_NONE >> #define __P001 PAGE_READONLY >> #define __P010 PAGE_COPY >> @@ -82,6 +83,7 @@ extern unsigned long ptr_in_current_pgd; >> #define __S101 PAGE_READONLY >> #define __S110 PAGE_SHARED >> #define __S111 PAGE_SHARED >> +#endif >> >> /* First physical page can be anywhere, the following is needed so that >> * va-->pa and vice versa conversions work properly without performance >> diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h >> index 4679e45c8348..a779418ceba9 100644 >> --- a/arch/sparc/include/asm/pgtable_64.h >> +++ b/arch/sparc/include/asm/pgtable_64.h >> @@ -187,25 +187,6 @@ bool kern_addr_valid(unsigned long addr); >> #define _PAGE_SZHUGE_4U _PAGE_SZ4MB_4U >> #define _PAGE_SZHUGE_4V _PAGE_SZ4MB_4V >> >> -/* These are actually filled in at boot time by sun4{u,v}_pgprot_init() */ >> -#define __P000 __pgprot(0) >> -#define __P001 __pgprot(0) >> -#define __P010 __pgprot(0) >> -#define __P011 __pgprot(0) >> -#define __P100 __pgprot(0) >> -#define __P101 __pgprot(0) >> -#define __P110 __pgprot(0) >> -#define __P111 __pgprot(0) >> - >> -#define __S000 __pgprot(0) >> -#define __S001 __pgprot(0) >> -#define __S010 __pgprot(0) >> -#define __S011 __pgprot(0) >> -#define __S100 __pgprot(0) >> -#define __S101 __pgprot(0) >> -#define __S110 __pgprot(0) >> -#define __S111 __pgprot(0) >> - >> #ifndef __ASSEMBLY__ >> >> pte_t mk_pte_io(unsigned long, pgprot_t, int, unsigned long); >> diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c >> index f6174df2d5af..6edc2a68b73c 100644 >> --- a/arch/sparc/mm/init_64.c >> +++ b/arch/sparc/mm/init_64.c >> @@ -2634,6 +2634,26 @@ void vmemmap_free(unsigned long start, unsigned long end, >> } >> #endif /* CONFIG_SPARSEMEM_VMEMMAP */ >> >> +/* These are actually filled in at boot time by sun4{u,v}_pgprot_init() */ >> +static pgprot_t protection_map[16] __ro_after_init = { >> + [VM_NONE] = __pgprot(0), >> + [VM_READ] = __pgprot(0), >> + [VM_WRITE] = __pgprot(0), >> + [VM_WRITE | VM_READ] = __pgprot(0), >> + [VM_EXEC] = __pgprot(0), >> + [VM_EXEC | VM_READ] = __pgprot(0), >> + [VM_EXEC | VM_WRITE] = __pgprot(0), >> + [VM_EXEC | VM_WRITE | VM_READ] = __pgprot(0), >> + [VM_SHARED] = __pgprot(0), >> + [VM_SHARED | VM_READ] = __pgprot(0), >> + [VM_SHARED | VM_WRITE] = __pgprot(0), >> + [VM_SHARED | VM_WRITE | VM_READ] = __pgprot(0), >> + [VM_SHARED | VM_EXEC] = __pgprot(0), >> + [VM_SHARED | VM_EXEC | VM_READ] = __pgprot(0), >> + [VM_SHARED | VM_EXEC | VM_WRITE] = __pgprot(0), >> + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __pgprot(0) >> +}; > > __pgprot(0) is 0 so you don't need to initialise the fields at all, it > is zeroized at startup as part of BSS section. Sure, will change. > >> + >> static void prot_init_common(unsigned long page_none, >> unsigned long page_shared, >> unsigned long page_copy, > >> diff --git a/include/linux/mm.h b/include/linux/mm.h >> index bc8f326be0ce..2254c1980c8e 100644 >> --- a/include/linux/mm.h >> +++ b/include/linux/mm.h >> @@ -420,11 +420,13 @@ extern unsigned int kobjsize(const void *objp); >> #endif >> #define VM_FLAGS_CLEAR (ARCH_VM_PKEY_FLAGS | VM_ARCH_CLEAR) >> >> +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT >> /* >> * mapping from the currently active vm_flags protection bits (the >> * low four bits) to a page protection mask.. >> */ >> extern pgprot_t protection_map[16]; >> +#endif >> >> /* >> * The default fault flags that should be used by most of the >> diff --git a/mm/mmap.c b/mm/mmap.c >> index 61e6135c54ef..e66920414945 100644 >> --- a/mm/mmap.c >> +++ b/mm/mmap.c >> @@ -101,6 +101,7 @@ static void unmap_region(struct mm_struct *mm, >> * w: (no) no >> * x: (yes) yes >> */ >> +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT >> pgprot_t protection_map[16] __ro_after_init = { >> [VM_NONE] = __P000, >> [VM_READ] = __P001, >> @@ -120,7 +121,6 @@ pgprot_t protection_map[16] __ro_after_init = { >> [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __S111 >> }; >> >> -#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > > Why not let architectures provide their protection_map[] and keep that > function ? Just to understand this correctly. All platforms provide their private protection_map[] array, drop __SXXX, __PXXX macros which will not be required anymore, depend on generic vm_get_page_prot() array look up, unless they need custom function via ARCH_HAS_VM_GET_PAGE_PROT ? > >> pgprot_t vm_get_page_prot(unsigned long vm_flags) >> { >> return protection_map[vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h index 62e0ebeed720..9b165117a454 100644 --- a/arch/arm64/include/asm/pgtable-prot.h +++ b/arch/arm64/include/asm/pgtable-prot.h @@ -89,24 +89,6 @@ extern bool arm64_use_ng_mappings; #define PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN) #define PAGE_EXECONLY __pgprot(_PAGE_DEFAULT | PTE_RDONLY | PTE_NG | PTE_PXN) -#define __P000 PAGE_NONE -#define __P001 PAGE_READONLY -#define __P010 PAGE_READONLY -#define __P011 PAGE_READONLY -#define __P100 PAGE_READONLY_EXEC /* PAGE_EXECONLY if Enhanced PAN */ -#define __P101 PAGE_READONLY_EXEC -#define __P110 PAGE_READONLY_EXEC -#define __P111 PAGE_READONLY_EXEC - -#define __S000 PAGE_NONE -#define __S001 PAGE_READONLY -#define __S010 PAGE_SHARED -#define __S011 PAGE_SHARED -#define __S100 PAGE_READONLY_EXEC /* PAGE_EXECONLY if Enhanced PAN */ -#define __S101 PAGE_READONLY_EXEC -#define __S110 PAGE_SHARED_EXEC -#define __S111 PAGE_SHARED_EXEC - #endif /* __ASSEMBLY__ */ #endif /* __ASM_PGTABLE_PROT_H */ diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c index 78e9490f748d..8f5b7ce857ed 100644 --- a/arch/arm64/mm/mmap.c +++ b/arch/arm64/mm/mmap.c @@ -13,6 +13,27 @@ #include <asm/cpufeature.h> #include <asm/page.h> +static pgprot_t protection_map[16] __ro_after_init = { + [VM_NONE] = PAGE_NONE, + [VM_READ] = PAGE_READONLY, + [VM_WRITE] = PAGE_READONLY, + [VM_WRITE | VM_READ] = PAGE_READONLY, + /* PAGE_EXECONLY if Enhanced PAN */ + [VM_EXEC] = PAGE_READONLY_EXEC, + [VM_EXEC | VM_READ] = PAGE_READONLY_EXEC, + [VM_EXEC | VM_WRITE] = PAGE_READONLY_EXEC, + [VM_EXEC | VM_WRITE | VM_READ] = PAGE_READONLY_EXEC, + [VM_SHARED] = PAGE_NONE, + [VM_SHARED | VM_READ] = PAGE_READONLY, + [VM_SHARED | VM_WRITE] = PAGE_SHARED, + [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, + /* PAGE_EXECONLY if Enhanced PAN */ + [VM_SHARED | VM_EXEC] = PAGE_READONLY_EXEC, + [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_EXEC, + [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC, + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC +}; + /* * You really shouldn't be using read() or write() on /dev/mem. This might go * away in the future. diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index d564d0ecd4cd..8ed2a80c896e 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -21,6 +21,7 @@ struct mm_struct; #endif /* !CONFIG_PPC_BOOK3S */ /* Note due to the way vm flags are laid out, the bits are XWR */ +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT #define __P000 PAGE_NONE #define __P001 PAGE_READONLY #define __P010 PAGE_COPY @@ -38,6 +39,7 @@ struct mm_struct; #define __S101 PAGE_READONLY_X #define __S110 PAGE_SHARED_X #define __S111 PAGE_SHARED_X +#endif #ifndef __ASSEMBLY__ diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index 7b9966402b25..2cf10a17c0a9 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -551,6 +551,26 @@ unsigned long memremap_compat_align(void) EXPORT_SYMBOL_GPL(memremap_compat_align); #endif +/* Note due to the way vm flags are laid out, the bits are XWR */ +static pgprot_t protection_map[16] __ro_after_init = { + [VM_NONE] = PAGE_NONE, + [VM_READ] = PAGE_READONLY, + [VM_WRITE] = PAGE_COPY, + [VM_WRITE | VM_READ] = PAGE_COPY, + [VM_EXEC] = PAGE_READONLY_X, + [VM_EXEC | VM_READ] = PAGE_READONLY_X, + [VM_EXEC | VM_WRITE] = PAGE_COPY_X, + [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_X, + [VM_SHARED] = PAGE_NONE, + [VM_SHARED | VM_READ] = PAGE_READONLY, + [VM_SHARED | VM_WRITE] = PAGE_SHARED, + [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, + [VM_SHARED | VM_EXEC] = PAGE_READONLY_X, + [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_X, + [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_X, + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_X +}; + pgprot_t vm_get_page_prot(unsigned long vm_flags) { unsigned long prot = pgprot_val(protection_map[vm_flags & diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h index 4866625da314..bca98b280fdd 100644 --- a/arch/sparc/include/asm/pgtable_32.h +++ b/arch/sparc/include/asm/pgtable_32.h @@ -65,6 +65,7 @@ void paging_init(void); extern unsigned long ptr_in_current_pgd; /* xwr */ +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT #define __P000 PAGE_NONE #define __P001 PAGE_READONLY #define __P010 PAGE_COPY @@ -82,6 +83,7 @@ extern unsigned long ptr_in_current_pgd; #define __S101 PAGE_READONLY #define __S110 PAGE_SHARED #define __S111 PAGE_SHARED +#endif /* First physical page can be anywhere, the following is needed so that * va-->pa and vice versa conversions work properly without performance diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index 4679e45c8348..a779418ceba9 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -187,25 +187,6 @@ bool kern_addr_valid(unsigned long addr); #define _PAGE_SZHUGE_4U _PAGE_SZ4MB_4U #define _PAGE_SZHUGE_4V _PAGE_SZ4MB_4V -/* These are actually filled in at boot time by sun4{u,v}_pgprot_init() */ -#define __P000 __pgprot(0) -#define __P001 __pgprot(0) -#define __P010 __pgprot(0) -#define __P011 __pgprot(0) -#define __P100 __pgprot(0) -#define __P101 __pgprot(0) -#define __P110 __pgprot(0) -#define __P111 __pgprot(0) - -#define __S000 __pgprot(0) -#define __S001 __pgprot(0) -#define __S010 __pgprot(0) -#define __S011 __pgprot(0) -#define __S100 __pgprot(0) -#define __S101 __pgprot(0) -#define __S110 __pgprot(0) -#define __S111 __pgprot(0) - #ifndef __ASSEMBLY__ pte_t mk_pte_io(unsigned long, pgprot_t, int, unsigned long); diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index f6174df2d5af..6edc2a68b73c 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -2634,6 +2634,26 @@ void vmemmap_free(unsigned long start, unsigned long end, } #endif /* CONFIG_SPARSEMEM_VMEMMAP */ +/* These are actually filled in at boot time by sun4{u,v}_pgprot_init() */ +static pgprot_t protection_map[16] __ro_after_init = { + [VM_NONE] = __pgprot(0), + [VM_READ] = __pgprot(0), + [VM_WRITE] = __pgprot(0), + [VM_WRITE | VM_READ] = __pgprot(0), + [VM_EXEC] = __pgprot(0), + [VM_EXEC | VM_READ] = __pgprot(0), + [VM_EXEC | VM_WRITE] = __pgprot(0), + [VM_EXEC | VM_WRITE | VM_READ] = __pgprot(0), + [VM_SHARED] = __pgprot(0), + [VM_SHARED | VM_READ] = __pgprot(0), + [VM_SHARED | VM_WRITE] = __pgprot(0), + [VM_SHARED | VM_WRITE | VM_READ] = __pgprot(0), + [VM_SHARED | VM_EXEC] = __pgprot(0), + [VM_SHARED | VM_EXEC | VM_READ] = __pgprot(0), + [VM_SHARED | VM_EXEC | VM_WRITE] = __pgprot(0), + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __pgprot(0) +}; + static void prot_init_common(unsigned long page_none, unsigned long page_shared, unsigned long page_copy, diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index bdaf8391e2e0..aa174fed3a71 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -230,25 +230,6 @@ enum page_cache_mode { #endif /* __ASSEMBLY__ */ -/* xwr */ -#define __P000 PAGE_NONE -#define __P001 PAGE_READONLY -#define __P010 PAGE_COPY -#define __P011 PAGE_COPY -#define __P100 PAGE_READONLY_EXEC -#define __P101 PAGE_READONLY_EXEC -#define __P110 PAGE_COPY_EXEC -#define __P111 PAGE_COPY_EXEC - -#define __S000 PAGE_NONE -#define __S001 PAGE_READONLY -#define __S010 PAGE_SHARED -#define __S011 PAGE_SHARED -#define __S100 PAGE_READONLY_EXEC -#define __S101 PAGE_READONLY_EXEC -#define __S110 PAGE_SHARED_EXEC -#define __S111 PAGE_SHARED_EXEC - /* * early identity mapping pte attrib macros. */ diff --git a/arch/x86/mm/pgprot.c b/arch/x86/mm/pgprot.c index 763742782286..7eca1b009af6 100644 --- a/arch/x86/mm/pgprot.c +++ b/arch/x86/mm/pgprot.c @@ -4,6 +4,25 @@ #include <linux/mm.h> #include <asm/pgtable.h> +static pgprot_t protection_map[16] __ro_after_init = { + [VM_NONE] = PAGE_NONE, + [VM_READ] = PAGE_READONLY, + [VM_WRITE] = PAGE_COPY, + [VM_WRITE | VM_READ] = PAGE_COPY, + [VM_EXEC] = PAGE_READONLY_EXEC, + [VM_EXEC | VM_READ] = PAGE_READONLY_EXEC, + [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC, + [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC, + [VM_SHARED] = PAGE_NONE, + [VM_SHARED | VM_READ] = PAGE_READONLY, + [VM_SHARED | VM_WRITE] = PAGE_SHARED, + [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, + [VM_SHARED | VM_EXEC] = PAGE_READONLY_EXEC, + [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_EXEC, + [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC, + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC +}; + pgprot_t vm_get_page_prot(unsigned long vm_flags) { unsigned long val = pgprot_val(protection_map[vm_flags & diff --git a/include/linux/mm.h b/include/linux/mm.h index bc8f326be0ce..2254c1980c8e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -420,11 +420,13 @@ extern unsigned int kobjsize(const void *objp); #endif #define VM_FLAGS_CLEAR (ARCH_VM_PKEY_FLAGS | VM_ARCH_CLEAR) +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT /* * mapping from the currently active vm_flags protection bits (the * low four bits) to a page protection mask.. */ extern pgprot_t protection_map[16]; +#endif /* * The default fault flags that should be used by most of the diff --git a/mm/mmap.c b/mm/mmap.c index 61e6135c54ef..e66920414945 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -101,6 +101,7 @@ static void unmap_region(struct mm_struct *mm, * w: (no) no * x: (yes) yes */ +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT pgprot_t protection_map[16] __ro_after_init = { [VM_NONE] = __P000, [VM_READ] = __P001, @@ -120,7 +121,6 @@ pgprot_t protection_map[16] __ro_after_init = { [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __S111 }; -#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT pgprot_t vm_get_page_prot(unsigned long vm_flags) { return protection_map[vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
Restrict generic protection_map[] array visibility only for platforms which do not enable ARCH_HAS_VM_GET_PAGE_PROT. For other platforms that do define their own vm_get_page_prot() enabling ARCH_HAS_VM_GET_PAGE_PROT, could have their private static protection_map[] still implementing an array look up. These private protection_map[] array could do without __PXXX/__SXXX macros, making them redundant and dropping them off. But platforms which do not define their custom vm_get_page_prot() enabling ARCH_HAS_VM_GET_PAGE_PROT, will still have to provide __PXXX/__SXXX macros. Although this now provides a method for other willing platforms to drop off __PXXX/__SXX macros completely. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@samba.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: x86@kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linuxppc-dev@lists.ozlabs.org Cc: sparclinux@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> --- arch/arm64/include/asm/pgtable-prot.h | 18 ------------------ arch/arm64/mm/mmap.c | 21 +++++++++++++++++++++ arch/powerpc/include/asm/pgtable.h | 2 ++ arch/powerpc/mm/book3s64/pgtable.c | 20 ++++++++++++++++++++ arch/sparc/include/asm/pgtable_32.h | 2 ++ arch/sparc/include/asm/pgtable_64.h | 19 ------------------- arch/sparc/mm/init_64.c | 20 ++++++++++++++++++++ arch/x86/include/asm/pgtable_types.h | 19 ------------------- arch/x86/mm/pgprot.c | 19 +++++++++++++++++++ include/linux/mm.h | 2 ++ mm/mmap.c | 2 +- 11 files changed, 87 insertions(+), 57 deletions(-)