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Wed, 4 Jun 2025 01:54:45 +0000 Date: Tue, 3 Jun 2025 18:54:42 -0700 From: Dan Williams To: Dan Williams , Alexey Kardashevskiy , Suzuki K Poulose , Aneesh Kumar K.V , Xu Yilun CC: , , , , , , Subject: Re: [PATCH v3 12/13] PCI/TSM: support TDI related operations for host TSM driver Message-ID: <683fa76214ebf_1626e100e1@dwillia2-xfh.jf.intel.com.notmuch> References: <1bcf37cd-0fc4-40fa-bcd1-e499619943bd@amd.com> <5d8483bb-ceb7-4ef3-920c-d6286a7de85d@arm.com> <683f7b6fec30f_1626e100ab@dwillia2-xfh.jf.intel.com.notmuch> <53c7523b-5cf3-4047-831f-12e0422cdf5d@amd.com> <683fa6f622abb_1626e100e0@dwillia2-xfh.jf.intel.com.notmuch> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <683fa6f622abb_1626e100e0@dwillia2-xfh.jf.intel.com.notmuch> X-ClientProxiedBy: CY5PR15CA0068.namprd15.prod.outlook.com (2603:10b6:930:18::31) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|DM4PR11MB7398:EE_ X-MS-Office365-Filtering-Correlation-Id: e9e72789-8e17-4e96-063d-08dda30ac7a0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?HkR148PZ1Xq0IW70KbaGz90juKyWnw5WyhK1LN29mNF9ri4CpykgXd8q3jit?= =?us-ascii?Q?7CQMwaEuEIekUD1NhOBwMnaeZtY8LHTjBNq4eeHMdCA5Uesy1aThwXC2Rx+9?= =?us-ascii?Q?erlmt5PIrD9KOc4d/JgML5TQZeOqIFI6gqDNDDZzEQcGnqkqxyAIuEA2zVcv?= =?us-ascii?Q?gGDAWiAKdfN2wj39XS3KoKXGDJCyLDyvUlmjRXiCuIt0AqBII7XRzx/+zm8E?= =?us-ascii?Q?pkBS4nTEJ4t7GwWhis0+H5MWJ67HJlffpowgZX3FhavxG2ex+UYSCJT8xlsf?= =?us-ascii?Q?w0NFDTKeruznflCHhI6N8oaQRu5WtbE7zvF4Na0hsDbnH7sfKZ9SFigJH1gv?= =?us-ascii?Q?jtvBthaLt+a4nPY2hIKe5g2Mi80OlqS5pGw/yZ53Dpy6xSnVAFro1LL/gNQp?= =?us-ascii?Q?aWfHELPmL4BXSDn48ai21BlL+Ju8t/NzrU7OHvjIK5+4yWbbjOJaUpStFPCI?= =?us-ascii?Q?CUqcZUIan6bGauMa8DZcSq3RsHZfDxTHR8MDsIEFagE3JF6Q8u8Bkhr0Yh2S?= =?us-ascii?Q?7hifTZItbif9/YMe5ix512/e2Cdxhr4Vf3fvqX8r3hLWUZwui2crN+GQzWsg?= =?us-ascii?Q?HOy3qm3sSZ4eyR+OIZ83TRqNMgBqNr9vxqa83nnzDbGkd7LDjwHzXXUjyKA/?= =?us-ascii?Q?P6+3jAPtsSZK71/sAuyhAgWaubWM2O+uggDwrS8kBwTzF2lsJ16qoslSY35S?= =?us-ascii?Q?4HeIlmwiJvmzydD0ECS11NxvxcYVoMOCthUbAa+w5MB2qibW6sNNYyZ1BKlm?= =?us-ascii?Q?9LXYDQqH8FJq/SVNg3BXkKvIdTkvj/lzs8e8vzcbNyzFW22DeuZ3EMDjACNd?= =?us-ascii?Q?jSHJsyaTFosnikzZixMasd7xrhSgmK+wr3nwOHL/5HRKJuchQ2cbAKZdFzJh?= =?us-ascii?Q?bbdqU2FeZZPFe9e9EM0Y/QBpGX8AvzXxLHTSl1NDQGD4WSy70Qae1EGmLgYz?= =?us-ascii?Q?x41XnkHRyK+g2cKaISkggeLXCXBvJf8IVLLUUzyxx96CGMR4X0zWitbXx++P?= =?us-ascii?Q?SZO1HVeE+oD/rUSAjPsEenev+pPXuiXFMUGSYnOrd+6+B+nIMUa1t1lJDjLq?= =?us-ascii?Q?D5x7c7PH15qdjfOM4MP9ezeapWMfS+SuQtx2faG+k8cUnrEDQLncqcKRmsYs?= =?us-ascii?Q?W1ITLeiMQwRBGCKBjA2qmP2RZjkZ+eZlJcj/dN+a1hC8vokEKRUp1INH+LlU?= =?us-ascii?Q?nuzLvZIFUweVdoobcKSGVIzfNb/whgo/8tKNCqClHsFFwDZn2dBkYH3lPdbT?= =?us-ascii?Q?+b0PRQeDfJTmJ2UVKslB8Mko0J/3DJ/xfVwrGD1R+pM/ssSqjkJX0bAdEwru?= =?us-ascii?Q?BMIgufFg//g1jHaUs3DlOrW8sRq6rAVnoyPbwwmS9LiU7+CNdjJ8S/09Tkhd?= =?us-ascii?Q?sx/Bx0jeUaStU3YaSD+NLtsaCuDqQVrTU/WfwyaycMGud9uF/N1ptxCq6ix3?= =?us-ascii?Q?GRQ5lYiOhmqLsSyUk1N49lAK0fUESKeNTn+sXHvhMP0n4umWweAB9bg5h8oO?= =?us-ascii?Q?h/SUYRWCKtkZWflo9wgf8DDw+suLgTlodjdaqS+W8z8UqDgfeAA9i18dDS5/?= =?us-ascii?Q?dmjiQOekhaDnBvwa14Z7G2hnfRwY/1xfu5C8imjXMYVbE0Sm49guW7JJGeYF?= =?us-ascii?Q?1A=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: e9e72789-8e17-4e96-063d-08dda30ac7a0 X-MS-Exchange-CrossTenant-AuthSource: PH8PR11MB8107.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jun 2025 01:54:45.1979 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: rcyX4RHLdxOfl4aRKTZ5WzGFxfuDhw8L9m2WCnUq2EgAL881mEryfRylIDGmlYTvKatrH2FqPC7XmDBgU+oatQWMbdhFasdQy3+d0E6HurY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB7398 X-OriginatorOrg: intel.com Dan Williams wrote: > Alexey Kardashevskiy wrote: > > > > > > On 4/6/25 08:47, Dan Williams wrote: > > > Suzuki K Poulose wrote: > > > [..] > > >>> Ok, something like this? and iommufd will call tsm_bind()? > > >> > > >> Remember that there may be other devices, AMBA CHI based devices > > >> being assigned. Not sure if they pretend to be PCI or not. > > > > > > I have been thinking about this especially with the relative ease of > > > creating samples/devsec/ given the existing Linux infrastructure > > > emulating PCI host bridges. > > > > > > Why not require PCI emulation for non-PCI devices? The tipping point is > > > whether the relative maintenance burden of not needing to maintain > > > multi-bus Device Security infrastructure outweighs the complexity of > > > impedance matching those other buses to PCI. > > > > > > Make "PCI" the lingua franca of Device Security. > > > > This is how virtio started, and now it has to behave like a proper PCI > > device, i.e. use DMA API. Or ivshmem which maps memory as "PCI" (which > > it is not PCI but the guest does not know it) and is deprecated now. > > Not the best idea to enforce PCI from day1 imho. > > VFIO is a Linux convention. PCIe TDISP is an industry standard protocol. Oh, sorry you said "virtio" not "vfio", but the point is still that we have not even got one implementation of a bus Device Security protocol upstream, let alone multiple.