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b=zlo5++Du9+gLqF2Y3KKfy5o1bAMvW3ER05prHaViwvFJdxbLG1ZrOJdtWfrYZ2vuuxE5RFnMsKzomljTaZ1RQjhpNqgzX5zliPaxr+axvucQmCp4MZ2fhLkQGQQy/o+oVqBrV7UGRAAq8z5o7DVuuhpImETNH/JvFcM0jn3re4I= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from MN0PR12MB6101.namprd12.prod.outlook.com (2603:10b6:208:3cb::10) by CH3PR12MB7691.namprd12.prod.outlook.com (2603:10b6:610:151::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9520.10; Wed, 21 Jan 2026 02:08:35 +0000 Received: from MN0PR12MB6101.namprd12.prod.outlook.com ([fe80::94eb:4bdb:4466:27ce]) by MN0PR12MB6101.namprd12.prod.outlook.com ([fe80::94eb:4bdb:4466:27ce%4]) with mapi id 15.20.9520.011; Wed, 21 Jan 2026 02:08:35 +0000 Message-ID: <870872aa-28e9-412a-bac6-8020bf560e4f@amd.com> Date: Tue, 20 Jan 2026 20:08:33 -0600 User-Agent: Mozilla Thunderbird Content-Language: en-US To: regressions , stable@vger.kernel.org Cc: iommu@lists.linux.dev, "Hegde, Vasant" , "Hou, Lizhi" From: Mario Limonciello Subject: IOMMU regression in linux-6.18.y Content-Type: text/plain; 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This is because of this commit in linux-6.18.y: commit c341dee80b5d ("iommu: disable SVA when CONFIG_X86 is set") That was originally backported from upstream: commit 72f98ef9a4be ("iommu: disable SVA when CONFIG_X86 is set") --- SVA support is a requirement for amdxdna. The series that this commit came from was part of a larger 8 patch series, but this was the only commit that was CC'ed to stable. As a result this is not broken in 6.19-rc, but it is broken in linux-6.18.y (and presumably any older stable kernels still around that picked it up). So there are two options I see: 1) Revert c341dee80b5d in linux-6.18.y (and any other stable kernel that picked it up but has amdxdna) 2) Bring the entire 8 patch series to linux-6.18.y. This is the entire series (I didn't look up the hashes from mainline, but they should have all landed): https://lore.kernel.org/linux-iommu/20251022082635.2462433-1-baolu.lu@linux.intel.com/ What should we do?