linux-kernel - Re: [PATCH v2 1/3] arm64: add FEAT_MTE_TAGGED

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Message-ID: <Z_O_SHiQwr-ZWw52@arm.com>
Date: Mon, 7 Apr 2025 13:04:24 +0100
From: Yury Khrustalev <yury.khrustalev@....com>
To: Yeoreum Yun <yeoreum.yun@....com>
CC: <catalin.marinas@....com>, <will@...nel.org>, <broonie@...nel.org>,
	<anshuman.khandual@....com>, <joey.gouly@....com>, <maz@...nel.org>,
	<oliver.upton@...ux.dev>, <frederic@...nel.org>,
	<shameerali.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 v2 1/3] arm64: add FEAT_MTE_TAGGED_FAR feature

On Thu, Apr 03, 2025 at 06:27:56PM +0100, Yeoreum Yun wrote:
> Add FEAT_MTE_TAGGED_FAR cpucap which makes FAR_ELx report
> all non-address bits on a synchronous MTE tag check fault since Armv8.9
> 
> Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
> ---
>  ...
>  arch/arm64/include/asm/hwcap.h               |  1 +
>  ...
> 
> diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h
> index 705a7afa8e58..7d22527a7975 100644
> --- a/arch/arm64/include/uapi/asm/hwcap.h
> +++ b/arch/arm64/include/uapi/asm/hwcap.h
> @@ -143,5 +143,6 @@
>  /*
>   * HWCAP3 flags - for AT_HWCAP3
>   */
> +#define HWCAP3_MTE_FAR		(1UL << 0)

Acked-by: Yury Khrustalev <yury.khrustalev@....com>