From patchwork Fri Nov 13 15:20:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Murzin X-Patchwork-Id: 11903927 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D865BC55ABD for ; Fri, 13 Nov 2020 15:21:12 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7FD302223C for ; Fri, 13 Nov 2020 15:21:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="kvHz00HL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7FD302223C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=pSW4wPJhUB5nTraJdTj1l6ptjsihWnqkSN7Jkut4kic=; b=kvHz00HL3nVnNuBoY1r/gIBM+ 2squTDyerorRRmJ2mxDoQmFV0tnyb5+0Wdh41dhKbxHh3gEPvImlMJpmCAHakrkQsFzl957A84+1G r87O47mSZkz+FPC6DyvZKfWMlOwYLRIm6g37mMlwZVkNky9fn/GxEBcY04TZNrrV198eSWsalgAIA syI6odqFM/Zs1FW+9wNakP7ehyTDms1E72+SAs2RO15fZyV5ANl5yPm1+IBP3SwRtX6K6aiSuUJ4w 2B7BAhBoqlxYAp0BB9pTvPqsnH02Pf4h4yMPaJr25Kea9VRtap1vCUISFpkz+WlT3IpUVsC6hEpwI jXfeu4lxw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kdasc-0001HA-Iw; Fri, 13 Nov 2020 15:20:50 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kdasW-0001FQ-KG for linux-arm-kernel@lists.infradead.org; Fri, 13 Nov 2020 15:20:45 +0000 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 7A3681534; Fri, 13 Nov 2020 07:20:40 -0800 (PST) Received: from login2.euhpc.arm.com (login2.euhpc.arm.com [10.6.27.34]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id DBD863F718; Fri, 13 Nov 2020 07:20:39 -0800 (PST) From: Vladimir Murzin To: linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 2/2] arm64: Expose EPAN support via HWCAPS2_EPAN Date: Fri, 13 Nov 2020 15:20:23 +0000 Message-Id: <20201113152023.102855-3-vladimir.murzin@arm.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20201113152023.102855-1-vladimir.murzin@arm.com> References: <20201113152023.102855-1-vladimir.murzin@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201113_102044_778129_88EE8485 X-CRM114-Status: GOOD ( 14.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: catalin.marinas@arm.com, keescook@chromium.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org So user have a clue whether exec-only permissions will work. Cc: Kees Cook Cc: Catalin Marinas Signed-off-by: Vladimir Murzin --- arch/arm64/include/asm/hwcap.h | 1 + arch/arm64/include/asm/sysreg.h | 1 + arch/arm64/include/uapi/asm/hwcap.h | 1 + arch/arm64/kernel/cpufeature.c | 3 +++ arch/arm64/kernel/cpuinfo.c | 1 + 5 files changed, 7 insertions(+) diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h index 9a5498c..6274c6c 100644 --- a/arch/arm64/include/asm/hwcap.h +++ b/arch/arm64/include/asm/hwcap.h @@ -105,6 +105,7 @@ #define KERNEL_HWCAP_RNG __khwcap2_feature(RNG) #define KERNEL_HWCAP_BTI __khwcap2_feature(BTI) #define KERNEL_HWCAP_MTE __khwcap2_feature(MTE) +#define KERNEL_HWCAP_EPAN __khwcap2_feature(EPAN) /* * This yields a mask that user programs can use to figure out what diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index 19147b6..e7bc373 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -796,6 +796,7 @@ #define ID_AA64MMFR1_VMIDBITS_8 0 #define ID_AA64MMFR1_VMIDBITS_16 2 +#define ID_AA64MMFR1_EPAN 3 /* id_aa64mmfr2 */ #define ID_AA64MMFR2_E0PD_SHIFT 60 diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h index b8f41aa..a99da14 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -75,5 +75,6 @@ #define HWCAP2_RNG (1 << 16) #define HWCAP2_BTI (1 << 17) #define HWCAP2_MTE (1 << 18) +#define HWCAP2_EPAN (1 << 19) #endif /* _UAPI__ASM_HWCAP_H */ diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 2033e0b..bb2016c 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2275,6 +2275,9 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { #ifdef CONFIG_ARM64_MTE HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_MTE_SHIFT, FTR_UNSIGNED, ID_AA64PFR1_MTE, CAP_HWCAP, KERNEL_HWCAP_MTE), #endif /* CONFIG_ARM64_MTE */ +#ifdef CONFIG_ARM64_EPAN + HWCAP_CAP(SYS_ID_AA64MMFR1_EL1, ID_AA64MMFR1_PAN_SHIFT, FTR_UNSIGNED, ID_AA64MMFR1_EPAN, CAP_HWCAP, KERNEL_HWCAP_EPAN), +#endif {}, }; diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 77605ae..9b69b13 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -94,6 +94,7 @@ static const char *const hwcap_str[] = { [KERNEL_HWCAP_RNG] = "rng", [KERNEL_HWCAP_BTI] = "bti", [KERNEL_HWCAP_MTE] = "mte", + [KERNEL_HWCAP_EPAN] = "epan", }; #ifdef CONFIG_COMPAT