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Wed, 25 Feb 2026 06:50:40 -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 v2 0/2] KVM: x86: Fix UBSAN bool warnings in module parameters Date: Wed, 25 Feb 2026 16:50:48 +0200 Message-ID: <20260225145050.2350278-1-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: SJ5PEPF00000203:EE_|BY5PR12MB4035:EE_ X-MS-Office365-Filtering-Correlation-Id: f4ed6c69-a9f3-4ecc-ea98-08de747d4cae X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|376014|82310400026|7416014|1800799024|13003099007|921020; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(36860700013)(376014)(82310400026)(7416014)(1800799024)(13003099007)(921020);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 3PTKPKOL1aiH/ODUEq6lK0NGXHOrMCkQf3ec38W2LUeJKBZtIpisDnq8GnZ7Kd/+JuUb72lq6/5cGMAy67+CmPQMESXh3LZ6IJppwK0obOu/5pFGCu8tDmbw9VSAaJWMOmqLUTsD1y5QmON0Msqkz5atUqLCXL4YjDnuP4qkKPHPUwZOSxAeorevxFAGDkR6W0qYh7BNpZ08bYM8xxgZOnVf8P7cPx3VlCpCRYpSs9gGGYEeldLIqQK/0J/shN2H/jU7zi3EDCWbTVQCu3RhsP4g8usipPxTZXZ+o4OayUaUs5qDwxZDmlmzoazr3MEuHnyKUx+L08U8lrzh56tHkRMwy474GhXn/JCUEg4+m61v3P1DsruD0aaa/1+PRGomLo5hOsp5Pnj9oBKC1IebroMroJEnCn1aBF9PWsy5LpVh6YfVe6tE64nG3q9Q7Pet X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Feb 2026 14:51:03.8112 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f4ed6c69-a9f3-4ecc-ea98-08de747d4cae X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF00000203.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4035 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(). Changelog - v1->v2: https://lore.kernel.org/all/20260210064621.1902269-1-gal@nvidia.com/ * Show auto avic as 'N' (Naveen) 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