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Peter Anvin" CC: Subject: [PATCH v5 06/20] x86/bugs: Add attack vector controls for TAA Date: Fri, 9 May 2025 11:28:25 -0500 Message-ID: <20250509162839.3057217-7-david.kaplan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250509162839.3057217-1-david.kaplan@amd.com> References: <20250509162839.3057217-1-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: BN3PEPF0000B072:EE_|CH3PR12MB8354:EE_ X-MS-Office365-Filtering-Correlation-Id: 5efa7740-52c2-4ee3-a43a-08dd8f16969f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|7416014|1800799024|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?p+VnyJfVqeX/67oKZY3kfuFJHuh9+umlWcXyNLlugU+CoJadU4MQPP9ynp3d?= =?us-ascii?Q?hszqEYqn3qrxx9TXpYwk02W9ar0X0i0eNIi8LUhxnxt/iUwz2lIG5wJoF0vp?= =?us-ascii?Q?8yDErMIibHpAt0rT6WOm+jH2dVi2oJhC/GNf0ghWpiSzg0Zb3ocXrooXaJ3t?= =?us-ascii?Q?EZOpT8yMuCzm89Ho8MMxUxxDz0WuQruqssIwnGAYvLqDeSbzwY44bx9QFuF/?= =?us-ascii?Q?rFy1G7fEW/aeXtaj6qqje4PlqD72/P8MI8XooUfKKXWuuB4I4FIOYyFPt2II?= =?us-ascii?Q?Cvwa3tm6hGmhZyX2NloGxnMBfRBc3bMutsmlB1inVcz/D14WJLqXT6ijgrpl?= =?us-ascii?Q?RL8jdJrZ5a8SfC/zFZqEgj4WnAjmKfx1CDMsL9Ufy8Rh1dSXXLcHmPYGUV8u?= =?us-ascii?Q?bjYwcax+UGRFSrEe9Fi22dDzE2/1FjPmKCQ+THFNV+xOWQqfApR7Q7x/QDk9?= =?us-ascii?Q?pWQfBQDD2vuRqhHNcX88EoiietGFrY612T20LeW4XOPFyTZBpiW/FNUevfko?= =?us-ascii?Q?tGlUgfwRRFvC/q4ddkQxHhSm+kOTD1URtdS1rSaW9rV7CE4K1UIhblfJpCtm?= =?us-ascii?Q?9qVI63np5ao4mFVWw77LaiLpV7DcQs3XNXL8oPRn/1UmL6hAee/+gabHJzwN?= =?us-ascii?Q?yy95CgoJR7ioyj9Bn0hNR2Vb1vq169Qw8PK3wnjHcap4qpOFr0pB1R/g58Qp?= =?us-ascii?Q?//crfDBqJ5O/gWKh78aIrsfe+NyHL+SOB7KbdZ7184+BPzGj6w31Sr+TIZ4z?= =?us-ascii?Q?HaCFJR2dtgO2AlnCm/iwVVdvWmOLshGn8wSNUoJYbeihTvMz7q37ECkDCPBT?= =?us-ascii?Q?iTEox6zU8JWrTnhSvjtAe5SXIHiYRzKqDnnb6TyJvtDzvFdHQV51U17LeKIy?= =?us-ascii?Q?FctXVuTZ0GfR8HVqhGYl1+pKbaiRFoXmMmpeCbPaGOgtb08zrQpOMVb1eOMM?= =?us-ascii?Q?ZBJEyZf0jv6WbbAblNldazP/uios6q33RMy+2KaKeMSpUZ59mPoytkbUgb+z?= =?us-ascii?Q?QrJwcFrsKc0qUEA/WGny+yPZgwGS7PvIjsIpmv6gQptq+ec6Sf2HFxupMgII?= =?us-ascii?Q?qzVubtHjWiwV/AfGEgplzdDq6pW4ryjHIkQBp6+IKsrQtMO+dGLaBcUNB1uE?= =?us-ascii?Q?5vbte97tiazfY2oHF7AFJ7nZt+VsWbBAfoWjwtW+zXw1xhIDKU1UEy59dFt/?= =?us-ascii?Q?SdnErQMAcUra7pvv+Ta1DOQSOKBlZIL5OqkR5o80I8Ujn5z5S0PUF9vrzAE3?= =?us-ascii?Q?4QBXm85T2ipWUqdAnIBuIJ2WA1jUx3QM2eEEHOIv1oWwz99GkqZY7JySzw21?= =?us-ascii?Q?pwFtXIQUSo40ApT2/m2zsJVf5l5Z6aq5yoona2PvOwi/FJewDwNz4z6IHVxu?= =?us-ascii?Q?wNMdCQmVm+YYIBHcL6F+v05ssU6Lfuu9qPaKA1zHtc9Mr7g4I2AAv+QvdUlI?= =?us-ascii?Q?GxF2wuZiLvZfs+S6ufU+3OuzpFPwMj+YNJ54rCamCi2KjY987kVq2EOxYgPV?= =?us-ascii?Q?emZf+LJiRfRkKixIn821LVBmLsPMZhSRI3Nk?= 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)(376014)(82310400026)(7416014)(1800799024)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 May 2025 16:28:53.5157 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5efa7740-52c2-4ee3-a43a-08dd8f16969f 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: BN3PEPF0000B072.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8354 Content-Type: text/plain; charset="utf-8" Use attack vector controls to determine if TAA mitigation is required. Signed-off-by: David Kaplan --- arch/x86/kernel/cpu/bugs.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 97d152c33e9e..d57132cdbc21 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -516,12 +516,13 @@ static void __init taa_select_mitigation(void) return; } =20 - if (cpu_mitigations_off()) - taa_mitigation =3D TAA_MITIGATION_OFF; - /* Microcode will be checked in taa_update_mitigation(). */ - if (taa_mitigation =3D=3D TAA_MITIGATION_AUTO) - taa_mitigation =3D TAA_MITIGATION_VERW; + if (taa_mitigation =3D=3D TAA_MITIGATION_AUTO) { + if (should_mitigate_vuln(X86_BUG_TAA)) + taa_mitigation =3D TAA_MITIGATION_VERW; + else + taa_mitigation =3D TAA_MITIGATION_OFF; + } =20 if (taa_mitigation !=3D TAA_MITIGATION_OFF) verw_clear_cpu_buf_mitigation_selected =3D true; @@ -529,7 +530,7 @@ static void __init taa_select_mitigation(void) =20 static void __init taa_update_mitigation(void) { - if (!taa_vulnerable() || cpu_mitigations_off()) + if (!taa_vulnerable()) return; =20 if (verw_clear_cpu_buf_mitigation_selected) @@ -570,7 +571,7 @@ static void __init taa_apply_mitigation(void) */ setup_force_cpu_cap(X86_FEATURE_CLEAR_CPU_BUF); =20 - if (taa_nosmt || cpu_mitigations_auto_nosmt()) + if (taa_nosmt || smt_mitigations =3D=3D SMT_MITIGATIONS_ON) cpu_smt_disable(false); } } --=20 2.34.1