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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Apr 2025 07:59:06.7762 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8563886d-54c0-46d2-30ff-08dd87bce1d7 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015CC.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB9102 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250430_085916_674709_DAAF6348 X-CRM114-Status: GOOD ( 18.92 ) 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 Wed, Apr 30, 2025 at 05:54:53PM +1000, Alexey Kardashevskiy wrote: > On 4/10/24 21:41, Jason Gunthorpe wrote: > > On Fri, Oct 04, 2024 at 02:32:28PM +1000, Alexey Kardashevskiy wrote: > > > > > > + __u32 __reserved; > > > > + __aligned_u64 vdev_id; > > I believe this ended up being "virt_id"... Yes. > > > > > > What is the nature of this id? > > > > It should be the vIOMMU's HW representation for the virtual device. > > > > On ARM it is the stream id, the index into the Stream Table > > > > On AMD it would be the "DeviceID" the index in the Device Table > > > ... and I just hit a problem with it - this is basically guest BDFn > and it works as long as I'm hotplugging the TEE-IO VF into an SNP VM > but does not when I pass through via the QEMU cmdline - bus numbers > are not assigned yet. So I have to postpone the vdevice allocation > till run time, did I miss something here? Thanks, I have a similar case with QEMU ARM64's VM: so vDEVICE on ARM is allocated at runtime as well because the BDF number isn't ready at the boot time. Nicolin