From: Ma Wupeng <mawupeng1@huawei.com> hulk inclusion category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/9826 -------------------------------- Introduce VM_PBHA_BIT0 to enable pbha bit0 for single vma. Signed-off-by: Ma Wupeng <mawupeng1@huawei.com> Signed-off-by: Fanhua Li <lifanhua5@huawei.com> Signed-off-by: Jiacheng Yu <yujiacheng3@huawei.com> --- Changes in v3: - use VM_HIGH_ARCH_5 (bit 37) instead of bit 39 - document the p0 mnemonic in Documentation/filesystems/proc.rst - drop the unused <uapi/asm/mman.h> include - fix the VM_PBHA_BIT0 comment --- Documentation/filesystems/proc.rst | 1 + arch/arm64/Kconfig | 1 + arch/arm64/include/asm/mman.h | 7 +++++++ arch/arm64/include/uapi/asm/mman.h | 1 + arch/arm64/mm/mmap.c | 3 +++ fs/proc/task_mmu.c | 3 +++ include/linux/mm.h | 6 ++++++ include/uapi/asm-generic/mman-common.h | 1 + tools/include/uapi/asm-generic/mman-common.h | 1 + 9 files changed, 24 insertions(+) diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst index a0062574e2ce..17c2c79d70c4 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -572,6 +572,7 @@ encoded manner. The codes are the following: mg mergeable advise flag bt arm64 BTI guarded page mt arm64 MTE allocation tags are enabled + p0 arm64 PBHA bit 0 is enabled um userfaultfd missing tracking uw userfaultfd wr-protect tracking ss shadow stack page diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 56f05c78c9d4..18ad070d5b8e 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2199,6 +2199,7 @@ config ARM64_CNP config ARM64_PBHA bool "Enable support for Page Based Hardware Attributes (PBHA)" default n + select ARCH_USES_HIGH_VMA_FLAGS help Page Based Hardware Attributes (PBHA) allow the SoC hardware to change behaviour depending on which mapping was used to access diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h index 5966ee4a6154..ff95d6c65fb7 100644 --- a/arch/arm64/include/asm/mman.h +++ b/arch/arm64/include/asm/mman.h @@ -5,6 +5,7 @@ #include <linux/compiler.h> #include <linux/types.h> #include <uapi/asm/mman.h> +#include <linux/pbha.h> static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, unsigned long pkey __always_unused) @@ -17,6 +18,9 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, if (system_supports_mte() && (prot & PROT_MTE)) ret |= VM_MTE; + if (system_support_pbha_bit0() && (prot & PROT_PBHA_BIT0)) + ret |= VM_PBHA_BIT0; + return ret; } #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) @@ -46,6 +50,9 @@ static inline bool arch_validate_prot(unsigned long prot, if (system_supports_mte()) supported |= PROT_MTE; + if (system_support_pbha_bit0()) + supported |= PROT_PBHA_BIT0; + return (prot & ~supported) == 0; } #define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr) diff --git a/arch/arm64/include/uapi/asm/mman.h b/arch/arm64/include/uapi/asm/mman.h index 1e6482a838e1..07e6f340a2f3 100644 --- a/arch/arm64/include/uapi/asm/mman.h +++ b/arch/arm64/include/uapi/asm/mman.h @@ -6,5 +6,6 @@ #define PROT_BTI 0x10 /* BTI guarded page */ #define PROT_MTE 0x20 /* Normal Tagged mapping */ +#define PROT_PBHA_BIT0 0x1000 /* PBHA 59 bit */ #endif /* ! _UAPI__ASM_MMAN_H */ diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c index 8f5b7ce857ed..75d099699c8c 100644 --- a/arch/arm64/mm/mmap.c +++ b/arch/arm64/mm/mmap.c @@ -98,6 +98,9 @@ pgprot_t vm_get_page_prot(unsigned long vm_flags) if (vm_flags & VM_MTE) prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED); + if (vm_flags & VM_PBHA_BIT0) + prot |= PTE_PBHA0; + return __pgprot(prot); } EXPORT_SYMBOL(vm_get_page_prot); diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 35c6a736e11c..09bacd826511 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -684,6 +684,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) [ilog2(VM_MTE)] = "mt", [ilog2(VM_MTE_ALLOWED)] = "", #endif +#ifdef CONFIG_ARM64_PBHA + [ilog2(VM_PBHA_BIT0)] = "p0", +#endif #ifdef CONFIG_ARCH_HAS_PKEYS /* These come out via ProtectionKey: */ [ilog2(VM_PKEY_BIT0)] = "", diff --git a/include/linux/mm.h b/include/linux/mm.h index dfe362127354..c94c8f43f8a0 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -411,6 +411,12 @@ extern unsigned int kobjsize(const void *objp); # define VM_SHARE_POOL VM_NONE #endif +#if defined(CONFIG_ARM64_PBHA) +# define VM_PBHA_BIT0 VM_HIGH_ARCH_5 /* Page Based Hardware Attributes bit 0 */ +#else +# define VM_PBHA_BIT0 VM_NONE +#endif + #ifndef VM_GROWSUP # define VM_GROWSUP VM_NONE #endif diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h index 559ad7c50b60..25c5170d6c26 100644 --- a/include/uapi/asm-generic/mman-common.h +++ b/include/uapi/asm-generic/mman-common.h @@ -13,6 +13,7 @@ #define PROT_SEM 0x8 /* page may be used for atomic ops */ /* 0x10 reserved for arch-specific use */ /* 0x20 reserved for arch-specific use */ +/* 0x1000 reserved for arch-specific use */ #define PROT_NONE 0x0 /* page can not be accessed */ #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */ diff --git a/tools/include/uapi/asm-generic/mman-common.h b/tools/include/uapi/asm-generic/mman-common.h index 6ce1f1ceb432..e397d1224747 100644 --- a/tools/include/uapi/asm-generic/mman-common.h +++ b/tools/include/uapi/asm-generic/mman-common.h @@ -13,6 +13,7 @@ #define PROT_SEM 0x8 /* page may be used for atomic ops */ /* 0x10 reserved for arch-specific use */ /* 0x20 reserved for arch-specific use */ +/* 0x1000 reserved for arch-specific use */ #define PROT_NONE 0x0 /* page can not be accessed */ #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */