Re: [PATCH v8 30/43] arm64: kasan: Allow enabling in-kernel MTE

Catalin Marinas
2020-11-05T17:25:59Z

On Thu, Nov 05, 2020 at 12:18:45AM +0100, Andrey Konovalov wrote:
> diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
> index 06ba6c923ab7..fcfbefcc3174 100644
> --- a/arch/arm64/kernel/mte.c
> +++ b/arch/arm64/kernel/mte.c
> @@ -121,6 +121,13 @@ void *mte_set_mem_tag_range(void *addr, size_t size, u8 tag)
> return ptr;
> }
>
> +void __init mte_init_tags(u64 max_tag)
> +{
> + /* Enable MTE Sync Mode for EL1. */
> + sysreg_clear_set(sctlr_el1, SCTLR_ELx_TCF_MASK, SCTLR_ELx_TCF_SYNC);
> + isb();
> +}

Is this going to be called on each CPU? I quickly went through the rest
of the patches and couldn't see how.

--
Catalin