# Re: \[PATCH 26/35\] kasan, arm64: Enable TBI EL1

- From: Catalin Marinas \<catalin.marinas@arm.com\>
- Date: 2020-08-27 10:40:47 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2020/08/6084904
- Thread: https://ratatoskr.run/linux-arm-kernel/2020/08/6068760/t.md

```text
On Fri, Aug 14, 2020 at 07:27:08PM +0200, Andrey Konovalov wrote:
> diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
> index 152d74f2cc9c..6880ddaa5144 100644
> --- a/arch/arm64/mm/proc.S
> +++ b/arch/arm64/mm/proc.S
> @@ -38,7 +38,7 @@
>  /* PTWs cacheable, inner/outer WBWA */
>  #define TCR_CACHE_FLAGS	TCR_IRGN_WBWA | TCR_ORGN_WBWA
>  
> -#ifdef CONFIG_KASAN_SW_TAGS
> +#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
>  #define TCR_KASAN_FLAGS TCR_TBI1
>  #else
>  #define TCR_KASAN_FLAGS 0

I prefer to turn TBI1 on only if MTE is present. So on top of the v8
user series, just do this in __cpu_setup.

-- 
Catalin

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