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Peter Anvin" CC: Subject: [PATCH v3 28/35] x86/bugs: Add attack vector controls for spectre_v1 Date: Wed, 8 Jan 2025 14:25:08 -0600 Message-ID: <20250108202515.385902-29-david.kaplan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250108202515.385902-1-david.kaplan@amd.com> References: <20250108202515.385902-1-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: DS3PEPF000099E2:EE_|SJ0PR12MB6757:EE_ X-MS-Office365-Filtering-Correlation-Id: fbd07725-b656-47d5-829f-08dd3022a61b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|36860700013|82310400026|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?r+gszPayQzZcyOoLItjicqEy0LglzdtjL3UvRg9Di2XRPS//7c0qBcpT3BNP?= =?us-ascii?Q?RMj8qKnowx5/DX7MT2xF2OLzQNaG3OHoY0nVDe7W9qw2gUlU/gH7LEbVmXNu?= =?us-ascii?Q?cl9C5Cg+htTEV2UCMXUN9MCZ+zifGbx1kAO55JhztETI9XocgwJqdFCQNrTk?= =?us-ascii?Q?PVDCKiICVy7pEt7Sf7fUyyWMbR7Mx3lVkPpLhIPATr902NQFs07aMnnjB8ft?= =?us-ascii?Q?13Fs1lbFLxAHKSczNzv/y0BmmPW2SjCTNsOSGStNnCu3JzNasmI/taXGYJCc?= =?us-ascii?Q?H2bHAYHGfJLxkaILAe5wy1omHhY3R4AbgN5LIktefX0P9+GlPWVe4RrPasWo?= =?us-ascii?Q?CyLqxNriCYa3o41RiSBpkcIul+saxI7O/zdmOhUkWb1tlWiqE8TQ1CG6g81d?= =?us-ascii?Q?f/yobQHh1Dslbx2Xj1cLDKjpCrn4802WlNclIDqL95lbQtmn/t0MeT/srbDR?= =?us-ascii?Q?nXeff4AhPyXL0v+Gmy52mnO2UyRzQBj22ngy496/8T/EhW7fJX8UkIso4BlI?= =?us-ascii?Q?RAdm6ilEiBcjbblRlYpDcv9WJ4GLVjnBhz7cjgiaJJND5FzqF0DNqzFOZSrn?= =?us-ascii?Q?a8QZzOpCCM6V60xreqdC4v2ukLf/E5FDvHj0NP1qq3KHZ7HNxhIX20XEdKQo?= =?us-ascii?Q?MtTBBYN5LuMd/nCOfhDoH7ZclZH+1yl52Hl24d4F9uw+6EY3KlvDaD6xChRG?= =?us-ascii?Q?eelH1t7vNCZ+9ld4MZvZIVRdfLVqgXTNng4HknFm9SeKNCFMdpSgAaGRmJV+?= =?us-ascii?Q?Lp11+fFsbXJzCYLcUMrmJ5Bh7gKXzsZBU6ZnEByekS5KCSODAt5Ht4XzYA0b?= =?us-ascii?Q?g/Us4IT5Ffhn+NOn3561DSgzoq3AgSN09OHo124Sk55EIVF3Ejka/M9Mgym0?= =?us-ascii?Q?H9M4j+D1dvvv3iqwL+ALiTKERFHWcjYlbcFGgIlplTUKf0CfkHZ7oEIoOvmD?= =?us-ascii?Q?1Dqxa5yWLDp/OpUizyNV0jwR5oDOf6fQRonjY42beXjIDtMhkAY9ymq2XnWF?= =?us-ascii?Q?JKfyXBMk7Vmc6Q6Sojuwfy3yZqnO3NkBqYav3eOY11rClk13Vnialud6nKqX?= =?us-ascii?Q?mW8xa8Ul1rYWKB6F/1T5u0feXplDataNXu7wRv+3DkseDnyn9h/yo9DgskSn?= =?us-ascii?Q?CtnLdwnynNtoIIk12aAZi94wEjnrcxcqf5X/e2ogrw/LPQBhP9+sw8sAIb/y?= =?us-ascii?Q?5pEc+b0Y6MS01VcqNZBL92ggfS69FcpLhEwt3uc+Y2TAMaZYrb0oymQSscac?= =?us-ascii?Q?miE2hoa9NEtP7L5X3WCKmAjEHLRoS8+FEbwqPQ4OcbFeLOO8R8A2TS4zyjKz?= =?us-ascii?Q?w/BGfb8FXpEASpWpCwOL0kwsqJUaJdjw1tn8EVhx44U6bNNS6G0xXkYzY95w?= =?us-ascii?Q?jniaSJ1YksS9GDnvb9ZeWVGINdw54IVrBDWu/l0HIokfDDh+V8mlub4GHYO7?= =?us-ascii?Q?dYPqPSquWRd3ktH0KKaNAhl0y/h/LzCVL+DKbCIsoSZdkmKhdASSHyDrHJpw?= =?us-ascii?Q?uSWJO1gGoRdqS6k=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)(376014)(7416014)(36860700013)(82310400026)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jan 2025 20:25:52.9383 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fbd07725-b656-47d5-829f-08dd3022a61b 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: DS3PEPF000099E2.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6757 Content-Type: text/plain; charset="utf-8" Use attack vector controls to determine if spectre_v1 mitigation is required. Signed-off-by: David Kaplan --- arch/x86/kernel/cpu/bugs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 9c9299b988d1..41c8a9dad411 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1172,6 +1172,9 @@ static void __init spectre_v1_select_mitigation(void) { if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1) || cpu_mitigations_off()) spectre_v1_mitigation =3D SPECTRE_V1_MITIGATION_NONE; + + if (!should_mitigate_vuln(X86_BUG_SPECTRE_V1)) + spectre_v1_mitigation =3D SPECTRE_V1_MITIGATION_NONE; } =20 static void __init spectre_v1_apply_mitigation(void) --=20 2.34.1