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Ip=[216.228.118.233]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000010.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4422 Received-SPF: permerror client-ip=2a01:111:f403:c105::1; envelope-from=nicolinc@nvidia.com; helo=CH1PR05CU001.outbound.protection.outlook.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.444, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FORGED_SPF_HELO=1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, SPF_NONE=0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org On Wed, Apr 15, 2026 at 11:55:29AM +0100, Shameer Kolothum wrote: > Add support for selecting and initializing a CMDQV backend based on the > cmdqv OnOffAuto property. > > If set to OFF, CMDQV is not used and the default IOMMUFD-backed allocation > path is taken. > > If set to AUTO, QEMU attempts to probe a CMDQV backend during device setup. > If probing succeeds, the selected ops are stored in the accelerated SMMUv3 > state and used. If probing fails, QEMU silently falls back to the default > path. > > If set to ON, QEMU requires CMDQV support. Probing is performed during > setup and failure results in an error. > > When a CMDQV backend is active, its callbacks are used for vIOMMU > allocation, free, and reset handling. Otherwise, the base implementation > is used. > > The current implementation wires up the Tegra241 CMDQV backend through the > generic ops interface. Functional CMDQV behaviour is added in subsequent > patches. > > No functional change. > > Signed-off-by: Shameer Kolothum With Eric's comments addressed, Reviewed-by: Nicolin Chen