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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Aug 2025 15:08:39.6464 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6876a271-1d93-4db5-450e-08dde644c53c 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: SJ1PEPF000026CA.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB5838 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250828_080857_622781_DFD159B5 X-CRM114-Status: GOOD ( 14.46 ) 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 Thu, Aug 28, 2025 at 09:51:49AM -0300, Jason Gunthorpe wrote: > On Fri, Aug 22, 2025 at 11:50:58AM -0700, Nicolin Chen wrote: > > > It feels like we need a no-fail re-attach operation, or at least an > > unlikely-to-fail one. I recall years ago we tried a can_attach op > > to test the compatibility but it didn't get merged. Maybe we'd need > > it so that a concurrent attach can test compatibility, allowing the > > re-attach in iommu_dev_reset_done() to more likely succeed. > > This is probably the cleanest option to split these things Yea, that could avoid failing a concurrent attach_dev during FLR unless the dryrun fails, helping non-SRIOV cases too. So, next version could have some new preparatory patches: - Pass in old domain to attach_dev - Add a can_attach_dev op Thanks Nicolin