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dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.160) by BN7PEPF00000092.mail.protection.outlook.com (10.167.245.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.451.8 via Frontend Transport; Thu, 17 Sep 2026 10:48:53 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.49; Thu, 17 Sep 2026 03:48:38 -0700 Received: from sonangrm.nvidia.com (10.126.230.37) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.49; Thu, 17 Sep 2026 03:48:36 -0700 Date: Thu, 17 Sep 2026 16:18:16 +0530 From: sonang patel To: Nicolin Chen CC: Jason Gunthorpe , Catalin Marinas , Will Deacon , , Robin Murphy , , Danilo Krummrich , Marek Szyprowski , , Mark Rutland , "Greg Kroah-Hartman" , Suzuki K Poulose , Gavin Shan , Vikram Sethi , Anshuman Khandual , "Shanker Donthineni" , Mostafa Saleh , , Thomas Huth , Marc Zyngier , Ryan Roberts , , Kohei Enju , Shaopeng Tan , Ard Biesheuvel , James Morse , Steven Price , Sang-Heon Jeon , Omar Sandoval , Andrew Morton , Jinjie Ruan , Sam Edwards , Douglas Anderson , "Florian Fainelli" , Chen-Yu Tsai , Huacai Chen , Thomas Zimmermann , Pranjal Shrivastava , Ashish Mhetre , Shameer Kolothum , , , , , Ankit Agrawal Subject: Re: [PATCH v1 6/8] iommu: Introduce TDISP T=0 state for confidential IOMMUs Message-ID: References: <0421799346a09bf7f32727330ca1044de05f46ba.1789010941.git.nicolinc@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: xOiblAuzD+2r769So9PEU+2nSQI2z61yjNHb4pJaAcRTxeS1g0OE9ePaB6gOmFWkDP1y147UlXbceGnGMzyYocWivhlCp7Zokco92+ZJ80fEfpOvXlzhpI2jfkEm87i3vwrU160bxwANeRngCGINT3C903B7XvaJw6GPDO1SQXqEM4yFTXe+f0npI7J5Qu60khbvPb6Rt45frEd3fHzR051sy7dC8f7i7dXY7D1/CGTJZLnUiBF6U3Ll7I3lmxWB94Dqu/nGsc+f0SJJ9EP9ckLvM7fSQf3qmUsUuxtY84P4y0kh1KaxIicJfUou4rCFO2y2y4cm9Q0Mql8pk39QXAqH/to/lvMZ285qBBe824t5wdssn7Yphn7t0/wfpTBS8NzpETnyc7MMY1i6b9bay9ikoGsXAu3oVBz+fMoCxSlOOMcZOLnZKEJXKLk/VOqP X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Sep 2026 10:48:53.1057 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 17fd890d-418e-413e-9fb6-08df14a943fc 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: BN7PEPF00000092.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4147 On Wed, 9 Sep 2026 20:32:49 -0700, Nicolin Chen wrote: > + * @tdisp_t1: device uses its confidential IOMMU's T=1 stream. A zero value > + * means T=0, where the T=1 stream remains blocked while the core > + * owns required DMA operations such as ATS. What happens when the TDI transitions to ERROR, and how does this bit signify it? A TDI can drop to ERROR asynchronously, and at that point the device is outside the trust boundary again. Thanks, Sonang