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CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc7edge2.nvidia.com; CAT:NONE; SFS:(13230040)(1800799024)(82310400026)(7416014)(36860700013)(376014); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2025 20:04:13.5792 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fdb28c24-f472-472f-7612-08ddc3119aeb 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: BN3PEPF0000B06E.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ5PPFDDE56F72B Received-SPF: permerror client-ip=2a01:111:f403:2415::617; envelope-from=nicolinc@nvidia.com; helo=NAM11-DM6-obe.outbound.protection.outlook.com X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Nicolin Chen From: Nicolin Chen via Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, Jul 14, 2025 at 04:59:40PM +0100, Shameer Kolothum wrote: > From: Nicolin Chen > > Not all fields in the SMMU IDR registers are meaningful for userspace. > Only the following fields can be used: > >   - IDR0: ST_LEVEL, TERM_MODEL, STALL_MODEL, TTENDIAN, CD2L, ASID16, TTF   >   - IDR1: SIDSIZE, SSIDSIZE   >   - IDR3: BBML, RIL   >   - IDR5: VAX, GRAN64K, GRAN16K, GRAN4K > > Use the relevant fields from these to check whether the host and emulated > SMMUv3 features are sufficiently aligned to enable accelerated SMMUv3 > support. > > To retrieve this information from the host, at least one vfio-pci device > must be assigned with "arm-smmuv3,accel=on" usage. Add a check to enforce > this. > > Note: > > ATS, PASID, and PRI features are currently not supported. Only devices > that do not require or make use of these features are expected to work. Can we support ATS/PASID at least? I need to double check intel's series, but I somehow recall that there is a PASID cap support in the VFIO level, so VM could actually report ATS/PASID caps? The invalidation part could forward ATC_INV command too, as kernel supports that. Thanks Nicolin