diff options
| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2021-03-15 13:20:11 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2021-04-11 10:55:30 +0100 |
| commit | f3b7deef8dcaf84fd659108ae300626ea5420f87 (patch) | |
| tree | 78e07172909ac4406713dbd9e31b182e475ac759 /arch/arm64/include/asm/memory.h | |
| parent | 1e28eed17697bcf343c6743f0028cc3b5dd88bf0 (diff) | |
arm64: mte: Add asynchronous mode support
MTE provides an asynchronous mode for detecting tag exceptions. In
particular instead of triggering a fault the arm64 core updates a
register which is checked by the kernel after the asynchronous tag
check fault has occurred.
Add support for MTE asynchronous mode.
The exception handling mechanism will be added with a future patch.
Note: KASAN HW activates async mode via kasan.mode kernel parameter.
The default mode is set to synchronous.
The code that verifies the status of TFSR_EL1 will be added with a
future patch.
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lore.kernel.org/r/20210315132019.33202-2-vincenzo.frascino@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/memory.h')
| -rw-r--r-- | arch/arm64/include/asm/memory.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 0aabc3be9a75..8fbc8dab044f 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -243,7 +243,9 @@ static inline const void *__tag_set(const void *addr, u8 tag) } #ifdef CONFIG_KASAN_HW_TAGS -#define arch_enable_tagging() mte_enable_kernel() +#define arch_enable_tagging_sync() mte_enable_kernel_sync() +#define arch_enable_tagging_async() mte_enable_kernel_async() +#define arch_enable_tagging() arch_enable_tagging_sync() #define arch_set_tagging_report_once(state) mte_set_report_once(state) #define arch_init_tags(max_tag) mte_init_tags(max_tag) #define arch_get_random_tag() mte_get_random_tag() |