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Mon, 9 Feb 2026 22:46:19 -0800 From: Gal Pressman To: Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , , "H. Peter Anvin" , Naveen N Rao , , CC: Gal Pressman Subject: [PATCH 0/2] KVM: x86: Fix UBSAN bool warnings in module parameters Date: Tue, 10 Feb 2026 08:46:19 +0200 Message-ID: <20260210064621.1902269-1-gal@nvidia.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002316:EE_|SN7PR12MB6689:EE_ X-MS-Office365-Filtering-Correlation-Id: 6dd1c2fc-5a27-4752-cf17-08de687020b7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|7416014|376014|1800799024|921020; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?9FKAILBtsVurfij2vCQpzMwIqVtfB20TbCff2SHKrpixGiAqlN11BQAOyeiK?= =?us-ascii?Q?Cvq3gdltV89aws+8VARpvJAk4aaXs7lcbsToZ1eyQJJrnWepZO8F0hv9aH8w?= =?us-ascii?Q?7gtBJTz1/l1IJT/NjxVATJzNY12NfG6GUrTV3U/Ix4ysmdUMrdm7yQu+h6ek?= =?us-ascii?Q?couRYYfEXKOBBOhGZZNnQNr4lPpHXViwiuILjqcBiAe1TVJpax1INLEEwtG7?= =?us-ascii?Q?ibTZ8TTfJkNMeBt6m5ntXDnYpIpMcftTTrvn4SMh6UfEFkc3xcJE1KLVr72J?= =?us-ascii?Q?CHsW4TUU1dH5LTjTHz71aTYTVux8DpvBv1DR367ncEHKUi+0EvReNUaUuyXn?= =?us-ascii?Q?HmQdj6w/TWEQ9YgI0ctWmQ/vpac+yEuOxcp/lStNNup1uSdE/RuNa8R9rsdZ?= =?us-ascii?Q?+BRJUpAy5ffHwiUvV6Aik4W+qYP5qjqqafXuk8+/8yZ7B2ymLz8e2dnUwjHW?= =?us-ascii?Q?0vB5GtBtoi0lQiEwL414efyCJN5XpHdBDXhM7+dTovVrSFdf7QDpu3Gl0PaF?= =?us-ascii?Q?QsiMFXLO9gdS3WN8J4vZaM5F6+ko7hZido+dsbPl4s0orAbxxY3uX6gYLrp5?= =?us-ascii?Q?QwpkXW9tjpWeB6OaBqdzKXKsGvdie+YjGAa7oGKqbyKNK5jpIFlEr6AXeTIq?= =?us-ascii?Q?Zd+4LZlZNn7tidqNcj48/btVWhwJuQVLdXLPpYmbiwWRIBNbqSFNV7Kq4JXT?= =?us-ascii?Q?n/fPOP41vb9mApyr6XKPpvoJPyxIVogdd2Ez4d9ZEMTjz5DiKgSdRQ4d4Vp0?= =?us-ascii?Q?i+4B0kc8Lyn14wk/ebdoCe9gFq3A5rPJ0ImH4qej0yKZ2KehVnoSbuTEHQ4Q?= =?us-ascii?Q?DguzIwZ+Q9pI/BMRatO5teNilZjjay8LM/KyP9hNpZze/+IFuwg4nrGg6nqm?= =?us-ascii?Q?3PT2E+xQ34EDO9n/AsMmH/3jtBZDaDGjtT8msSS9vjY+AOg14BSFWR1tMU80?= =?us-ascii?Q?cZFqeio0fmUeLqHCdDkaTOMpzZwfNucrvIU/eWD4vvsvVxGWJN3hDhLHzwpE?= =?us-ascii?Q?Y4uEGvdZ0d/wQo90jffcfTsA0RPIZ+5zuycI4pxRU4HvLJUwTNcUEac0pBql?= =?us-ascii?Q?MWyQpRzwUbvgeb0FqlQ8NLETwpaNu9tOeiC+ykFB0uZBWNtzYd/P47KEjfbr?= =?us-ascii?Q?G1bXJ1ahqeYl78v/rHAjVg2dnzunN4jMAjyLBzozgVofCOUzLVjamcQO07+W?= =?us-ascii?Q?Oit/MdZ4rDCsNzKaopd87SLdvpjXC3lknoHZeuovshvgSPr331Iluz19usyc?= =?us-ascii?Q?lJnIamT3YZUJoznEp3pXJdZqW8mDdIw6wYLnttCMhfL8hfWYIeiY+64nMqPB?= =?us-ascii?Q?mWIlkEnicCHz17ULRQo3T1wk3moIfyuXaMS0TmfNiY3VhCAQ6e35llkUN4rL?= =?us-ascii?Q?lA/bDq4Befl1hvzyUDISXOJ5qDHHFrG3/eC+NDosIyv/1mToMPc3864hzoCA?= =?us-ascii?Q?sr01gCGOmTDJ4W00pWOH2W+DOrAcIfLLz1xHz/ie6euLO+URCDcs99pI6TTF?= =?us-ascii?Q?baI+/wlFPzCfWUcMxFqPKKaxKk9Qnyl/hSEz3DWG1NwG/BQzDltBBaQqwbEY?= =?us-ascii?Q?qAi+tGyhSfkYb9w9G9UPUc0rE8f+bKQVSazQ2bNu2OMG6uQvegIzru6p/mX2?= =?us-ascii?Q?xYyGkDGORrqXSX91bHiURhV85lGWBlsb7ThZGc05womcUwXbkMTONuTLORxA?= =?us-ascii?Q?P1GdBJrqV030n4Xt1qieZSAW6tg=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(7416014)(376014)(1800799024)(921020);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: lzKR/IRVVFLFT9L6//xoRVVqFetNQvcPsoXwjGb+u645LiiKbnHOnq54wSwDm1qBovi4ZmD/09X1eX5BXHMzmvlVEdaA9GFq1wV2ABj4Tfb0ietCLKtLb3hgKBrPgogs/JdCt86/AhfwlWmVISDJyvwIBdKawZRGdDvDqrdP6PXIXVDNVrbAX5k9GcsFR0nCxBj5jTSTNPp0HrNJtnT8QrzikIpRNDuhCD1P92AnnDpFipUqKdZ26Cws6sTEUuvSBKC1xLdsa0hj201mVCaeBS+LSCU763BJ36QTotWJlTFIn0vUZyWE2JK28i2RRlEN9JfPFaWBKo6ml8jkXGIYdw3Qf1RxazQsJocVhs7IU2tqs3rLWQZxAOhl6lzbloK7vMBbMGLCqCZniOGAGd5ph35+v+1lL0lJ97tOLhvuHLEGKFufZKJreAMx5s8XmEI7 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Feb 2026 06:46:32.7467 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6dd1c2fc-5a27-4752-cf17-08de687020b7 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002316.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6689 Several KVM module parameters use int to support a special -1 (auto) value, but rely on param_get_bool() for the sysfs getter. When userspace reads these parameters before the auto value is resolved, param_get_bool() interprets the int as a bool, triggering UBSAN "load of value 255 is not a valid value for type '_Bool'" warnings. Fix both instances by implementing getter functions that handle the -1 case before falling through to param_get_bool(). Gal Pressman (2): KVM: SVM: Fix UBSAN warning when reading avic parameter KVM: x86/mmu: Fix UBSAN warning when reading nx_huge_pages parameter arch/x86/kvm/mmu/mmu.c | 5 +++++ arch/x86/kvm/svm/avic.c | 13 ++++++++++++- 2 files changed, 17 insertions(+), 1 deletion(-) -- 2.52.0