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Mon, 2 Sep 2024 18:13:50 -0700 Date: Mon, 2 Sep 2024 18:13:49 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: Mostafa Saleh , , Hanjun Guo , , Joerg Roedel , Kevin Tian , , Len Brown , , , Lorenzo Pieralisi , "Rafael J. Wysocki" , "Robert Moore" , Robin Murphy , "Sudeep Holla" , Will Deacon , Alex Williamson , Eric Auger , Jean-Philippe Brucker , Moritz Fischer , Michael Shavit , , Shameerali Kolothum Thodi Subject: Re: [PATCH v2 8/8] iommu/arm-smmu-v3: Support IOMMU_DOMAIN_NESTED Message-ID: References: <0-v2-621370057090+91fec-smmuv3_nesting_jgg@nvidia.com> <8-v2-621370057090+91fec-smmuv3_nesting_jgg@nvidia.com> <20240830170426.GV3773488@nvidia.com> <20240903003022.GF3773488@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20240903003022.GF3773488@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000989E5:EE_|IA0PR12MB8423:EE_ X-MS-Office365-Filtering-Correlation-Id: 5dfaa07d-fc3e-44e8-a717-08dccbb5ac7a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|7416014|376014|1800799024|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?6k861STF/xgrhzM0NrAAyGMY0kV/IeT70g3VRfBjD6W73xnDvokW4gdkOvqn?= =?us-ascii?Q?9Mtuvti+XsuSG3FafixQN6Yv53lgX4u+3IbtNmQfKAO1gy935f1j/ZxoXZvR?= =?us-ascii?Q?mIwzAzxp42sGnzxDqiDIgwLj0jNKeFAkBzYH1vTu7kA5tNrvBCeqbS8yZtl6?= =?us-ascii?Q?wdmskc3sJyE08NEnkRjFQvwRI6W3BqAUuVjU2sOdybKAb9Rcv4Wzli3Ii0tp?= =?us-ascii?Q?ztD6MY60UrzwPbrsTBlAvLvPPibaUHL0SnoPZ78slL4tRK32QEjbBEQlJDZw?= =?us-ascii?Q?4qpv/94mSo757ZMzzB1g1OU21fHqIaUP39o5UcX1tuOWS942xfDdC9gadd7K?= =?us-ascii?Q?zw7CvQ3Kq3d5uhmmlH29ZDqWM85AqK7c0IFuY8J+23Bc8YwmJAa752lEYOW+?= =?us-ascii?Q?Y8sbO0SUc9rerMui4Yk31wKtTMRQZaAVvh7uN8DQ9m46FhLTDhViHmy8rdrW?= =?us-ascii?Q?8C7LUka1gIP01B9TF084F9GKPXfYfEGYLnyU3N9Zc8H4btBLyeeT8VNsiyMz?= =?us-ascii?Q?ADVaN6gsUafRphZm8X4UUtOlqyRrXSf88UJdU/8OuW1OOTSJhnJe0J/L/mC/?= =?us-ascii?Q?zMuPKTFRot5SOdTcJ1omPIPHltcxyM86BBwQJ+pY27Eo5wrA+OmFiWpI6ols?= =?us-ascii?Q?q+iyQ+EetUSM99PNwwFgvDxVh0/H1/31rqI/E82QkmBtfbMehoNu7XIxDTxW?= =?us-ascii?Q?tIM39RwAOqycvD3oeF0OtwVOQHtkHd4vxbvPDzmDsb5dwZpcYJfdMgTu4D2g?= =?us-ascii?Q?Y42tihC22WEyMZZD6pIPQgVw2XUQs3uDn3D0XkptyTEGGuHgNlaEy/C1JQea?= =?us-ascii?Q?/R0qqOpHseVgSl8OcyLaGjKT2475/JB0J2tTLCdzhcr7HeQ+zGILbLd4R9qe?= =?us-ascii?Q?7jni4aQx0LBN5WkDygIou6CioyFIN1CijZnB4jGIy3EiIVMZKd/f1GeGAK/C?= =?us-ascii?Q?gO2yWJQhCtkw2gENdibFMi4dEiJjXByXQXAF88Bs0ifby6bzvjTpRlJIEu75?= =?us-ascii?Q?sQB2L/qTPREKKPR0cfB9bGUixBHlwi9O047/IKsbUtJvQtmsUHt4tL04nx+a?= =?us-ascii?Q?T3v5lGXUB8cGtxWGx+qBY/lrQg9LCWgeguR/EH6iMADslzrTGXkKBcnp1a2x?= =?us-ascii?Q?aKWgE87dgL9EvQzbkPMOZhNqLqrkKhmGyq/4oWLLJXI5B+3n8cgc/si+mkGP?= =?us-ascii?Q?VPJiZoUCPlOHS2ySrJGSIb/HWBbb2CWhrwYcGUxMrh7q9MTe/NOUonJbfQJS?= =?us-ascii?Q?3Tq9bVAFMS6hNUPk+sQuEPXMX65P7slagWAVgtGlFSyMxfZSCXq/LBTd6eX+?= =?us-ascii?Q?0Fnqcb77tiOy9aPFnhajC62k7mYP/l/UA1M/JiLwrMvG3XohRvlRyQ7Fnava?= =?us-ascii?Q?8t+mIXi/fYqlTOaRY99nKl/JqxOFYzintjEcEs/ynXtGAdGBTloisDYMHUkM?= =?us-ascii?Q?eiNEorY1XdGrlRSEfdCA4iZ5Bb+xIaPx?= 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)(7416014)(376014)(1800799024)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Sep 2024 01:13:52.2068 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5dfaa07d-fc3e-44e8-a717-08dccbb5ac7a 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: MWH0EPF000989E5.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8423 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240902_181410_135031_FC0EA3F6 X-CRM114-Status: GOOD ( 15.86 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Sep 02, 2024 at 09:30:22PM -0300, Jason Gunthorpe wrote: > > I see you are talking in LPC about IOMMUFD: > > https://lore.kernel.org/linux-iommu/0-v1-01fa10580981+1d-iommu_pt_jgg@nvidia.com/T/#m2dbb08f3bf8506a492bc7dda2de662e42371e683 > > > > Do you have any plans to talk about this also? > > Nothing specific, this is LPC so if people in the room would like to > use the session for that then we can talk about it. Last year the room > wanted to talk about PASID mostly. > > I haven't heard if someone is going to KVM forum to talk about > vSMMUv3? Eric? Nicolin do you know? I am not attending for seemingly in-person option only, nor sure if there's a topic: it doesn't seem to have an official schedule yet.. That being said, I think we do need a thread at least, for vSMMU in the QEMU. The multi-vSMMU design requires to change the vSMMU module to a pluggable one via QEMU command line, while the PCI- vSMMU topology should be implemented in libvirt, either of which needs some effort, where I haven't got bandwidth to spare. Given that kernel patches are in a solid shape, I think I could start to borrow some help. I'll draft an email to the qemu-devel list. Folks joining the forum might be able to carry out a discussion. Thanks Nicolin