From nobody Sun Feb 8 18:48:57 2026 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2043.outbound.protection.outlook.com [40.107.237.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1AB44245006 for ; Mon, 10 Mar 2025 16:41:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.237.43 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741624883; cv=fail; b=PS74paQIgavblesTMdvbjNFlVMkiLX8Arylkqyfhq4uUFBcVAl0s63aBkcYfTjBzFl1odEZ+9vjJJEB1iyPrVSYHXF6iScO0etjZGZXIJayai1zrfbU/sFzsef65VVEagvP7tMiJpUK8mhPpItQTATvSf+7JRaWXblzBJmwRHgQ= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741624883; c=relaxed/simple; bh=jJct9cB5vi3B/m2+kL3nnhIeOVvQsLn6DMfmyjSjQrs=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=rO2D5uS/kFf6LNtNMIKJ9NLLmElJHwQGNtuQbY1PcYhiGXMzmmc57fCdEOSArBv9M41x1x+0GAMIe74uz/ANkV8tWFBHXRTHsdtYuNfuNK9qGxgRrByS4jzeBGDDg5NVt5UvAklsFSk2ZrzgSXgk5NYnQ5tWbCw6L925y0bL6dU= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=4rtTgXcL; arc=fail smtp.client-ip=40.107.237.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="4rtTgXcL" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=hMHSXTUSsaoXq848w4sc6kH4myoA1AX21O3oguf2unLWgjRn9VP0voqKzwh54BAnHsvFLTbJYSYpuZDjN9D3xDciYyuolvXjdaP8T9GmrILmZfhCoM51AIFAjPTqK4p/0HiYoYpkUpGeaFzCoR5NBUaNQYhGb+dOH9VVdNNHs/jRCH/4uIbjSk3LUomN5Ai6hP6YkBz01GTIKoz91koYkNVYW9azXsQLiv55cs3IL6CedAMuv2WFfJGeyCPbqFuYhDLuZwRkUlBlGUHkR9LinqHNB3jh8Ti4jV2l8DB7IqHCzU3Qgna5Cf99dTIinJ/pqm7LFCkeRSSt9ANW3w5/nw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=XSmgqJpoj0MFr38gouY77aAf9dVJitIpFUj2d3jphjE=; b=MIdah0On+AEK/Mu7DMztWV7dvAEACxD4SXSGV6lDOPGc6XieTEy1rVyRDRx8j+EbBPALfxxR4LTeLXBvMM4lVSPekQuyEF+79ieWxClSv1KwaaEX82DpRhyjHyNOKfOeqCZ9ANiRSXGi91LtrOZbREcBxuvrneVDuRr1UO232qeXXL3guHNuWSwIUjfby7460cHtvWktGjADafpFD7FIAg8TE5YHIWxLumb6KXRjCwdsnckq8IbkKttAdkrJijUvBjpJteWf3OePihIv7kd9VQc7wb9sa7f54s6yF3GLv8KA9CFV6MRha83IrD0tX8UCE1RmH3XvniT++RxiRQ71/A== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=linutronix.de smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=XSmgqJpoj0MFr38gouY77aAf9dVJitIpFUj2d3jphjE=; b=4rtTgXcLw021VJcUeB0q9OqYJBGnGSnC6NAsVshvFyTMnX/X0bELNFbbgZi979y4qce+gdmh3zS3/Tt1WK0dufybGfYVtSWjprOe0w6B/JbMes4lc10bDKbSE0GrpOj6aOQw2VfUXwXmS1QjJrBuC6zTM/GVmKprUVtdKoPsyKU= Received: from MN2PR16CA0061.namprd16.prod.outlook.com (2603:10b6:208:234::30) by BY5PR12MB4067.namprd12.prod.outlook.com (2603:10b6:a03:212::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8511.27; Mon, 10 Mar 2025 16:41:13 +0000 Received: from BL6PEPF00022571.namprd02.prod.outlook.com (2603:10b6:208:234:cafe::78) by MN2PR16CA0061.outlook.office365.com (2603:10b6:208:234::30) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8511.26 via Frontend Transport; Mon, 10 Mar 2025 16:41:13 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by BL6PEPF00022571.mail.protection.outlook.com (10.167.249.39) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8534.20 via Frontend Transport; Mon, 10 Mar 2025 16:41:13 +0000 Received: from tiny.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 10 Mar 2025 11:41:11 -0500 From: David Kaplan To: Thomas Gleixner , Borislav Petkov , Peter Zijlstra , Josh Poimboeuf , Pawan Gupta , Ingo Molnar , Dave Hansen , , "H . Peter Anvin" CC: , Brendan Jackman , Derek Manwaring Subject: [PATCH v4 36/36] cpu: Show attack vectors in sysfs Date: Mon, 10 Mar 2025 11:40:23 -0500 Message-ID: <20250310164023.779191-37-david.kaplan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250310164023.779191-1-david.kaplan@amd.com> References: <20250310164023.779191-1-david.kaplan@amd.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 X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF00022571:EE_|BY5PR12MB4067:EE_ X-MS-Office365-Filtering-Correlation-Id: efa9dc2a-0ce5-44b9-6aee-08dd5ff25ed5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|7416014|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?Y+vcm4iiI/lErc8HZYb+bHY+k11KvLd5QNMr7DAOXYMu8kmvNLmv7VZw2bPt?= =?us-ascii?Q?m8XMiOeXKIMdGTkDHrrJZJ++n9Dx8oG798E5iiBpm8Ou++qG1Chskt8PMpZW?= =?us-ascii?Q?rxIeR4DjmYTQSuyVtnnQH1unrkBfs5heHNDJ7M2OGhWnoasjranQBtQxjhYy?= =?us-ascii?Q?tuDDzmwTApBMSiu5t1k7VuQgywS4LvA/JcgSuVKgEiiSgqIjDljA/Dh/B+0k?= =?us-ascii?Q?BLO9zOuOlrsj4pdpSMyjFJlV6yb82AtXQpJ7xq8Imv64NT2Au5MV5cF+eVJk?= =?us-ascii?Q?ul8wmWpB/TDAqlvk4nwWNgODOABnDsFN/UUJB+DmKqhR+Tb9PEuw+s29yS2s?= =?us-ascii?Q?XqMZ/jxYn4KQE2p+VTphSuYCK5yyDTVXYZ+WP3g3AtKHdJp9qay4K4EEQoD5?= =?us-ascii?Q?xy1VKYfF5DyMi3pjIpR1IzpiaAZ/f8L3DSIA9Mvo3HPGjnwM3jd32BkzyXRV?= =?us-ascii?Q?41SatfeIbU8peNfDsTYnIZoYiESua+BaZtwI62KKJ+dbPHyUFDnW86B38Jqa?= =?us-ascii?Q?R0TjSoBBSg78gtLekc6opx7ODZyr7k/ClJvgd64Grdl8C0l9fKkLyW/cHul2?= =?us-ascii?Q?mvECKDdP1tGmgdU9aNk/2bxkWtpfc9wKyj4jE2drh9As1AI/pJaCorqxEya3?= =?us-ascii?Q?VLTZMSP3VZBZAxek2ENrsENyNHmeguv6VSIEOIHirikrCQsD762WvQ84KxPG?= =?us-ascii?Q?c0IFo1j5S7syB2gADhRu+o099FxjoYsdy1XZkQtquiKoFC5nGdc3Vn+Gs/k9?= =?us-ascii?Q?M2NV5/xg6HvhcZXnx2VGzRpmYLL3X8ahnOEsyVhnEzUHSHYZWqLLhz4TeHq+?= =?us-ascii?Q?wNDXp8A8txqagASzvXd2aEMkvkcmxMxjpqVOEOlff4o+4PedQC0kFk9wDs0K?= =?us-ascii?Q?fHHSDSTyGmgIE4FSlkQ+/+LoKJAirBXb50wHsd9pI1hu/kPxZM0uh7Y24Fla?= =?us-ascii?Q?7+clCEeqqMRDZVJo6X173q1O9SIYizINCUbEpB/9yn2CRwafTcJrls4znI3b?= =?us-ascii?Q?cl/aQE37Dg9GE3Zy+qd2DjsQWjfPTxdKez1VHK9LQBFalLLUAfIGtHTMX3gb?= =?us-ascii?Q?GjMJKyuieydoB/1JLJGwVXLizeQXXi2cKZS+swxZ8kQbOCs/NW3f80NBJ80h?= =?us-ascii?Q?R0HJ1fjKX5dNNgtZ6q0BOz8fs5+Mk55jtCw5fdDGQOag3hBq6y4sZqw56rv1?= =?us-ascii?Q?gBgPVckX4m37zjv7DWLAtsuv8EXrTgg2s5M64FXFFXNKv9qNZclwXAnlhhy/?= =?us-ascii?Q?A9xQ1aO2w20xlgNuCHWS8Dpn1dt0iUNaDEiSw1AqQGTEA+++wxwqxO9G5AF6?= =?us-ascii?Q?COhcqQ3tYjuUCeOTjKX8JCN+VjYSquz6nAs91RRF8QwA9HXpB0U+k8kYppO7?= =?us-ascii?Q?wmthlINQ1pOnb2nB50nCMrpiZajwMD/KmaURVfMSBrF7d/uTJv0x8VRiGJi2?= =?us-ascii?Q?PL+CE3x4DFqkMV9JzcwXCBtL1NwtaE4RCRmtzmg/g+k3DMu34Tkc3w=3D=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(376014)(7416014)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2025 16:41:13.3778 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: efa9dc2a-0ce5-44b9-6aee-08dd5ff25ed5 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF00022571.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4067 Content-Type: text/plain; charset="utf-8" Show the status of currently mitigated attack vectors in /sys/devices/system/cpu/vector_mitigations/ Note that these files are not under the vulnerabilities directory so they will not be printed by 'lscpu'. Signed-off-by: David Kaplan --- drivers/base/cpu.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index a7e511849875..e9bb9c3edf91 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -20,6 +20,7 @@ #include #include #include +#include #include =20 #include "base.h" @@ -641,6 +642,70 @@ static const struct attribute_group cpu_root_vulnerabi= lities_group =3D { .attrs =3D cpu_root_vulnerabilities_attrs, }; =20 +static const char *attack_vector_state(enum cpu_attack_vectors v) +{ + return str_on_off(cpu_mitigate_attack_vector(v)); +} + +static ssize_t cpu_show_user_kernel_vector(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%s\n", attack_vector_state(CPU_MITIGATE_USER_KER= NEL)); +} + +static ssize_t cpu_show_user_user_vector(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%s\n", attack_vector_state(CPU_MITIGATE_USER_USER= )); +} + +static ssize_t cpu_show_guest_host_vector(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%s\n", attack_vector_state(CPU_MITIGATE_GUEST_HOS= T)); +} + +static ssize_t cpu_show_guest_guest_vector(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%s\n", attack_vector_state(CPU_MITIGATE_GUEST_GUE= ST)); +} + +static ssize_t cpu_show_smt_vector(struct device *dev, + struct device_attribute *attr, char *buf) +{ + switch (smt_mitigations) { + case SMT_MITIGATIONS_OFF: + return sysfs_emit(buf, "off\n"); + case SMT_MITIGATIONS_ON: + return sysfs_emit(buf, "on\n"); + case SMT_MITIGATIONS_AUTO: + return sysfs_emit(buf, "auto\n"); + } + + return 0; +} + +static DEVICE_ATTR(user_kernel, 0444, cpu_show_user_kernel_vector, NULL); +static DEVICE_ATTR(user_user, 0444, cpu_show_user_user_vector, NULL); +static DEVICE_ATTR(guest_host, 0444, cpu_show_guest_host_vector, NULL); +static DEVICE_ATTR(guest_guest, 0444, cpu_show_guest_guest_vector, NULL); +static DEVICE_ATTR(smt, 0444, cpu_show_smt_vector, NULL); + +static struct attribute *cpu_vector_mitigations_attrs[] =3D { + &dev_attr_user_kernel.attr, + &dev_attr_user_user.attr, + &dev_attr_guest_host.attr, + &dev_attr_guest_guest.attr, + &dev_attr_smt.attr, + NULL +}; + +static const struct attribute_group cpu_vector_mitigations_group =3D { + .name =3D "vector_mitigations", + .attrs =3D cpu_vector_mitigations_attrs, +}; + static void __init cpu_register_vulnerabilities(void) { struct device *dev =3D bus_get_dev_root(&cpu_subsys); @@ -648,6 +713,8 @@ static void __init cpu_register_vulnerabilities(void) if (dev) { if (sysfs_create_group(&dev->kobj, &cpu_root_vulnerabilities_group)) pr_err("Unable to register CPU vulnerabilities\n"); + if (sysfs_create_group(&dev->kobj, &cpu_vector_mitigations_group)) + pr_err("Unable to register CPU attack vectors\n"); put_device(dev); } } --=20 2.34.1