From ec0288369f0cc6d85837a18f1c4c65451c94477b Mon Sep 17 00:00:00 2001 From: Vincenzo Frascino Date: Wed, 6 Oct 2021 16:47:50 +0100 Subject: 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 Cc: Catalin Marinas Cc: Andrey Konovalov Signed-off-by: Vincenzo Frascino Reviewed-by: Catalin Marinas Acked-by: Andrey Konovalov Link: https://lore.kernel.org/r/20211006154751.4463-5-vincenzo.frascino@arm.com Signed-off-by: Will Deacon --- arch/arm64/include/asm/uaccess.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/arm64/include/asm/uaccess.h') 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(); } -- cgit v1.2.3