From nobody Thu Oct 9 13:21:35 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 12BBD27FB19; Wed, 18 Jun 2025 08:45:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750236322; cv=none; b=D97zsXcpGFCRzh/KhwgApyOaRJUTBGBNvj6i1ANO/tfj7Fx8qbLbJ7xmNhU7IFhLSVZFhQazSKaL1fva6vxc0f9oEXJuu/JIyJHT9c41hc605x1KsODPmsKaIfcNjA9GTICnP+2jDgfXKJVAylG8LcYCt0bd85TmO+Vwp6OAQCs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750236322; c=relaxed/simple; bh=+JIrPuGS8nUD4SB8FQOcnnhPfYRc/S7ugJdAbyTE1SM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=cIykp9rsbU7EdRl72jrYHW67bB5q4kfXPRim9Lm0Mgg2q+YHCEZ7Zg7TptROeX9E1lbHzgy8kwDyYBeLn/dccExx0jzcO70J7syrdZH01/CaKJgnQ+rkQs6S/8y45ZYoHFgFgYXiljEwQg/Pi0N7+lBMoXbtisoYq66a2ZkxXXw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D8C0F1BC0; Wed, 18 Jun 2025 01:44:59 -0700 (PDT) Received: from e129823.cambridge.arm.com (e129823.arm.com [10.1.197.6]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 3ED393F66E; Wed, 18 Jun 2025 01:45:18 -0700 (PDT) From: Yeoreum Yun To: catalin.marinas@arm.com, pcc@google.com, will@kernel.org, broonie@kernel.org, anshuman.khandual@arm.com, joey.gouly@arm.com, yury.khrustalev@arm.com, maz@kernel.org, oliver.upton@linux.dev, frederic@kernel.org, akpm@linux-foundation.org, surenb@google.com Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Yeoreum Yun Subject: [PATCH v9 01/10] arm64/cpufeature: add FEAT_MTE_TAGGED_FAR feature Date: Wed, 18 Jun 2025 09:45:04 +0100 Message-Id: <20250618084513.1761345-2-yeoreum.yun@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250618084513.1761345-1-yeoreum.yun@arm.com> References: <20250618084513.1761345-1-yeoreum.yun@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Acked-by: Yury Khrustalev --- arch/arm64/kernel/cpufeature.c | 8 ++++++++ arch/arm64/tools/cpucaps | 1 + 2 files changed, 9 insertions(+) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index b34044e20128..af6a6924a3e8 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -320,6 +320,7 @@ static const struct arm64_ftr_bits ftr_id_aa64pfr1[] = =3D { =20 static const struct arm64_ftr_bits ftr_id_aa64pfr2[] =3D { ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL1_F= PMR_SHIFT, 4, 0), + ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL= 1_MTEFAR_SHIFT, 4, ID_AA64PFR2_EL1_MTEFAR_NI), ARM64_FTR_END, }; =20 @@ -2874,6 +2875,13 @@ static const struct arm64_cpu_capabilities arm64_fea= tures[] =3D { .matches =3D has_cpuid_feature, ARM64_CPUID_FIELDS(ID_AA64PFR1_EL1, MTE, MTE3) }, + { + .desc =3D "FAR on MTE Tag Check Fault", + .capability =3D ARM64_MTE_FAR, + .type =3D ARM64_CPUCAP_SYSTEM_FEATURE, + .matches =3D has_cpuid_feature, + ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, MTEFAR, IMP) + }, #endif /* CONFIG_ARM64_MTE */ { .desc =3D "RCpc load-acquire (LDAPR)", diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps index 10effd4cff6b..fe8f4f8ce95c 100644 --- a/arch/arm64/tools/cpucaps +++ b/arch/arm64/tools/cpucaps @@ -68,6 +68,7 @@ MPAM MPAM_HCR MTE MTE_ASYMM +MTE_FAR SME SME_FA64 SME2 --=20 LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}