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Peter Anvin" CC: , Brendan Jackman , Derek Manwaring Subject: [PATCH v4 09/36] x86/bugs: Only allow retbleed=stuff on Intel Date: Mon, 10 Mar 2025 11:39:56 -0500 Message-ID: <20250310164023.779191-10-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: BL6PEPF00022572:EE_|IA0PR12MB7554:EE_ X-MS-Office365-Filtering-Correlation-Id: 0f9f5cb1-adfa-42cb-e86e-08dd5ff24d1e 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?yprC64ISb4kevj5ZVB5DaeBSnNhTz8dvXAfdFbPdOOGCe1PbZ9LZ907J8Rh8?= =?us-ascii?Q?+n7zyh5Nz4GWwyPHNzAKyxK/nZU8tlpKDuMu+4RAf1zhpoOZOqrJpMcxcFSW?= =?us-ascii?Q?q6RMEuQWmO9L6qWjcaIbWLfKefgS2YvOvLtp4zGbvHK+1u73wIS5zgFSc8Ex?= =?us-ascii?Q?psjWJgx1j4nYx5YCMHowhNWnwiTaSLCM6dl0XYjLEtmwLmizT3X5Fg4Kp/+X?= =?us-ascii?Q?F9PUGu+b1Zb0kiW5skqFFbd9Mzucl2nLaq+HsQDO/1izk9oPY4D01tAX538q?= =?us-ascii?Q?T85H/baQMTqsg1Mdac48znraP0VeWan3CtcmY2UniBdQwyOxUy42r2gDFvXL?= =?us-ascii?Q?aDC9mm82l5akWxvDScoaxHLJ/mBdEVXE4kpOQO/GbsKsH1ddjqFIXuMwlqTt?= =?us-ascii?Q?zH2FlBEU8Tat7DX/PQ0n7ImRxMbmHuMRG4o81anVLUVGs4AqZtpHa7lAmRiN?= =?us-ascii?Q?GAM6VWN/CmEX8Rjo/2lvPxNxKmdLJ0kvbw1LKZN9orFmLPZhFwIcsUNKNty4?= =?us-ascii?Q?h1pTR39LVlAnb0FsMaY3+kLc1+2vwVzuzSyf/73CEXPfrN3AwBVCr/4idvsc?= =?us-ascii?Q?1CPB6FYdixJ2R1nOkeQwBiLXFbJmxEx7TeNvXTHpBa3yzUdIyUPBQPb0E+FT?= =?us-ascii?Q?J4z5w3GO5HRXEqr+3d2Sp8E/CocNVtleCB/mFGv3FGfeiVwKTnSpRIN0LSIr?= =?us-ascii?Q?lHQJmiee4o4/xICzWHywKipsMOuAi7xI6crmN147nczaXfCDt+Ne8XG1dzuc?= =?us-ascii?Q?09c8Xd3VUBmY+wjG7nR3gUERir5Cyck4YPko5dX+eiwmKuFNC01AET0qOPeK?= =?us-ascii?Q?hPwQ/fdcamAOowE7SBDs0ispOyUEO/MXA0hihRQnIhIi1DnGpuuvwjvqPwyT?= =?us-ascii?Q?vg0nDzt8GZsaajonOm9DLPZ+zPX+8K1Lh3uZa8Jjhpu9IDXBbcftnWr4/K+F?= =?us-ascii?Q?ono+ArLqo4gkCYVL5kZ2No+iPQNAloBO/F56ECMaubeSBFWaRNWXzj9ueuYB?= =?us-ascii?Q?+oxSyHfXOeTLuNLGDpybf8VPNSBdfN5kPWDmCl+PtdYKci1wKvlyTDZbUXOi?= =?us-ascii?Q?Yoj6yz3qVX3tu/0xxH38nuTDi8qNBwbazCSFDF69zEQgDBtH1P3r21sdlOid?= =?us-ascii?Q?OORVXIStiSKAZOFAge/hPAouDYczc3RTDWhUhGCUt74L8DVqgBHQzYqPSUar?= =?us-ascii?Q?Tgl+LQPmAqU0BDFqKh67lLpHWTSTeneZOYOHOxcQmsPGsdpNUrG5co+EQQzT?= =?us-ascii?Q?50hlILBce252Obez8reHvkBEi4LKq1CUyMs6GdAVTl/Bb8czzD1kOJ7tGhoZ?= =?us-ascii?Q?/rCEVK1qd7Xq/29wAkw2iF8qDu+uuA3eS2bnZVYkcPfLaPIJo9lSuONZqiQX?= =?us-ascii?Q?TjsI2mBAK4CQgs0SVszwhn5pA81RD6py2DXh13KB/DjCjaR12ZMpOhQus0jU?= =?us-ascii?Q?FLdbB0tmxORKUco5J/JyxPtGuHRbkLAtmrvcxcmNRrk36BhG/5OkRrafcaBn?= =?us-ascii?Q?pWuwlu3HJp6epmI=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 16:40:43.6605 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0f9f5cb1-adfa-42cb-e86e-08dd5ff24d1e 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: BL6PEPF00022572.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7554 Content-Type: text/plain; charset="utf-8" The retbleed=3Dstuff mitigation is only applicable for Intel CPUs affected by retbleed. If this option is selected for another vendor, print a warning and fall back to the AUTO option. Signed-off-by: David Kaplan --- arch/x86/kernel/cpu/bugs.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index de120ecb752d..4af342d226c8 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1178,6 +1178,10 @@ static void __init retbleed_select_mitigation(void) case RETBLEED_CMD_STUFF: if (IS_ENABLED(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) && spectre_v2_enabled =3D=3D SPECTRE_V2_RETPOLINE) { + if (boot_cpu_data.x86_vendor !=3D X86_VENDOR_INTEL) { + pr_err("WARNING: retbleed=3Dstuff only supported for Intel CPUs.\n"); + goto do_cmd_auto; + } retbleed_mitigation =3D RETBLEED_MITIGATION_STUFF; =20 } else { --=20 2.34.1