linux-kernel - Re: [PATCH v3 3/3] tools/kselftest: add MTE

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Message-ID: <aBT9yiaLF9LisLR6@arm.com>
Date: Fri, 2 May 2025 18:15:54 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Yeoreum Yun <yeoreum.yun@....com>
Cc: will@...nel.org, broonie@...nel.org, anshuman.khandual@....com,
	joey.gouly@....com, yury.khrustalev@....com, maz@...nel.org,
	oliver.upton@...ux.dev, frederic@...nel.org,
	shmeerali.kolothum.thodi@...wei.com, james.morse@....com,
	mark.rutland@....com, huangxiaojia2@...wei.com,
	akpm@...ux-foundation.org, surenb@...gle.com, robin.murphy@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, nd@....com
Subject: Re: [PATCH v3 3/3] tools/kselftest: add MTE_FAR hwcap test

On Thu, Apr 10, 2025 at 08:47:21AM +0100, Yeoreum Yun wrote:
> diff --git a/tools/testing/selftests/arm64/abi/hwcap.c b/tools/testing/selftests/arm64/abi/hwcap.c
> index 35f521e5f41c..a539eeb0bfc0 100644
> --- a/tools/testing/selftests/arm64/abi/hwcap.c
> +++ b/tools/testing/selftests/arm64/abi/hwcap.c
> @@ -1098,6 +1098,12 @@ static const struct hwcap_data {
>  		.sigill_fn = hbc_sigill,
>  		.sigill_reliable = true,
>  	},
> +	{
> +		.name = "MTE_FAR",
> +		.at_hwcap = AT_HWCAP3,
> +		.hwcap_bit = HWCAP3_MTE_FAR,
> +		.cpuinfo = "mte_far",
> +	},
>  };

This is all good but I'd also like to see a test to check the FAR_EL1
bits are actually exposed to the signal handler when the hwcap is
present.

-- 
Catalin