diff options
| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2021-10-06 16:47:50 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-10-07 09:30:24 +0100 |
| commit | ec0288369f0cc6d85837a18f1c4c65451c94477b (patch) | |
| tree | 7f102511697c947cd6e96c1438f7e50ad05e6d13 /arch/arm64/include/asm/mte-kasan.h | |
| parent | d73c162e073376dd207d716cb4b9cfc809be7e80 (diff) | |
arm64: mte: Add asymmetric mode support
MTE provides an asymmetric mode for detecting tag exceptions. In
particular, when such a mode is present, the CPU triggers a fault
on a tag mismatch during a load operation and asynchronously updates
a register when a tag mismatch is detected during a store operation.
Add support for MTE asymmetric mode.
Note: If the CPU does not support MTE asymmetric mode the kernel falls
back on synchronous mode which is the default for kasan=on.
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Andrey Konovalov <andreyknvl@gmail.com>
Link: https://lore.kernel.org/r/20211006154751.4463-5-vincenzo.frascino@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/mte-kasan.h')
| -rw-r--r-- | arch/arm64/include/asm/mte-kasan.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/mte-kasan.h b/arch/arm64/include/asm/mte-kasan.h index 22420e1f8c03..478b9bcf69ad 100644 --- a/arch/arm64/include/asm/mte-kasan.h +++ b/arch/arm64/include/asm/mte-kasan.h @@ -130,6 +130,7 @@ static inline void mte_set_mem_tag_range(void *addr, size_t size, u8 tag, void mte_enable_kernel_sync(void); void mte_enable_kernel_async(void); +void mte_enable_kernel_asymm(void); #else /* CONFIG_ARM64_MTE */ @@ -161,6 +162,10 @@ static inline void mte_enable_kernel_async(void) { } +static inline void mte_enable_kernel_asymm(void) +{ +} + #endif /* CONFIG_ARM64_MTE */ #endif /* __ASSEMBLY__ */ |