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| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2021-10-06 17:47:50 +0200 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-10-07 10:30:24 +0200 |
| commit | ec0288369f0cc6d85837a18f1c4c65451c94477b (patch) | |
| tree | 7f102511697c947cd6e96c1438f7e50ad05e6d13 /arch/arm64/include/asm/uaccess.h | |
| parent | arm64: mte: CPU feature detection for Asymm MTE (diff) | |
| download | linux-ec0288369f0cc6d85837a18f1c4c65451c94477b.tar.xz linux-ec0288369f0cc6d85837a18f1c4c65451c94477b.zip | |
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/uaccess.h')
| -rw-r--r-- | arch/arm64/include/asm/uaccess.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 190b494e22ab..315354047d69 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -196,13 +196,13 @@ static inline void __uaccess_enable_tco(void) */ static inline void __uaccess_disable_tco_async(void) { - if (system_uses_mte_async_mode()) + if (system_uses_mte_async_or_asymm_mode()) __uaccess_disable_tco(); } static inline void __uaccess_enable_tco_async(void) { - if (system_uses_mte_async_mode()) + if (system_uses_mte_async_or_asymm_mode()) __uaccess_enable_tco(); } |