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CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc6edge1.nvidia.com; CAT:NONE; SFS:(13230040)(1800799024)(36860700013)(82310400026)(7416014)(376014); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Mar 2025 17:55:14.0495 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8e12aef1-84b5-412c-145c-08dd657cdea3 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.160]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000989EB.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4435 Received-SPF: permerror client-ip=2a01:111:f403:2009::624; envelope-from=nicolinc@nvidia.com; helo=NAM10-BN7-obe.outbound.protection.outlook.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.335, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham 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+alex.bennee=linaro.org@nongnu.org Sender: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org X-TUID: +4okPcQ934Kf On Wed, Mar 12, 2025 at 04:15:10PM +0100, Eric Auger wrote: > On 3/11/25 3:10 PM, Shameer Kolothum wrote: > > Based on SMMUv3 as a parent device, add a user-creatable smmuv3-accel > > device. In order to support vfio-pci dev assignment with a Guest > guest > > SMMUv3, the physical SMMUv3 has to be configured in nested(S1+s2) > nested (s1+s2) > > mode, with Guest owning the S1 page tables. Subsequent patches will > the guest > > add support for smmuv3-accel to provide this. > > Can't this -accel smmu also works with emulated devices? Do we want an > exclusive usage? Is there any benefit from emulated devices working in the HW- accelerated nested translation mode? Thanks Nicolin