Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753898AbdDCPUa (ORCPT ); Mon, 3 Apr 2017 11:20:30 -0400 Received: from foss.arm.com ([217.140.101.70]:60434 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751716AbdDCPU1 (ORCPT ); Mon, 3 Apr 2017 11:20:27 -0400 From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, arnd@arndb.de, catalin.marinas@arm.com, christoffer.dall@linaro.org, jiong.wang@arm.com, kvmarm@lists.cs.columbia.edu, linux-arch@vger.kernel.org, marc.zyngier@arm.com, mark.rutland@arm.com, suzuki.poulose@arm.com, will.deacon@arm.com Subject: [RFC 4/9] arm64/cpufeature: detect pointer authentication Date: Mon, 3 Apr 2017 16:19:20 +0100 Message-Id: <1491232765-32501-5-git-send-email-mark.rutland@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1491232765-32501-1-git-send-email-mark.rutland@arm.com> References: <1491232765-32501-1-git-send-email-mark.rutland@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2144 Lines: 64 So that we can dynamically handle the presence of pointer authentication functionality, wire up probing code in cpufeature.c. Currently, this only detects the presence of an architected algorithm. Signed-off-by: Mark Rutland Cc: Catalin Marinas Cc: Suzuki K Poulose Cc: Will Deacon --- arch/arm64/include/asm/cpucaps.h | 4 +++- arch/arm64/kernel/cpufeature.c | 22 ++++++++++++++++++++++ 2 files changed, 25 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h index fb78a5d..15dd6d6 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -37,7 +37,9 @@ #define ARM64_HAS_NO_FPSIMD 16 #define ARM64_WORKAROUND_REPEAT_TLBI 17 #define ARM64_WORKAROUND_QCOM_FALKOR_E1003 18 +#define ARM64_HAS_ADDRESS_AUTH 19 +#define ARM64_HAS_GENERIC_AUTH 20 -#define ARM64_NCAPS 19 +#define ARM64_NCAPS 21 #endif /* __ASM_CPUCAPS_H */ diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 30255b2..172c80e 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -871,6 +871,28 @@ static bool has_no_fpsimd(const struct arm64_cpu_capabilities *entry, int __unus .min_field_value = 0, .matches = has_no_fpsimd, }, +#ifdef CONFIG_ARM64_POINTER_AUTHENTICATION + { + .desc = "Address authentication (architected algorithm)", + .capability = ARM64_HAS_ADDRESS_AUTH, + .def_scope = SCOPE_SYSTEM, + .sys_reg = SYS_ID_AA64ISAR1_EL1, + .sign = FTR_UNSIGNED, + .field_pos = ID_AA64ISAR1_APA_SHIFT, + .min_field_value = ID_AA64ISAR1_APA_ARCHITECTED, + .matches = has_cpuid_feature, + }, + { + .desc = "Generic authentication (architected algorithm)", + .capability = ARM64_HAS_GENERIC_AUTH, + .def_scope = SCOPE_SYSTEM, + .sys_reg = SYS_ID_AA64ISAR1_EL1, + .sign = FTR_UNSIGNED, + .field_pos = ID_AA64ISAR1_GPA_SHIFT, + .min_field_value = ID_AA64ISAR1_GPA_ARCHITECTED, + .matches = has_cpuid_feature + }, +#endif /* CONFIG_ARM64_POINTER_AUTHENTICATION */ {}, }; -- 1.9.1