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Mon, 28 Apr 2025 12:00:16 -0700 Date: Mon, 28 Apr 2025 12:00:14 -0700 From: Nicolin Chen To: Bagas Sanjaya CC: , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v2 15/22] Documentation: userspace-api: iommufd: Update vCMDQ Message-ID: References: <820dfdee121292fe4cf891feb86f82ceea521e22.1745646960.git.nicolinc@nvidia.com> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B06D:EE_|PH8PR12MB7280:EE_ X-MS-Office365-Filtering-Correlation-Id: e584fedd-2e6a-4dc7-0024-08dd8686fb95 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|7416014|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?r/2ctnPy9/Wn6DUvR4XrwTt4kMFBYcRFQESF9l1ba9xEowVEwuozopGAVFM7?= =?us-ascii?Q?x2e/VRzQJ4gVV0nBvDWO9yLSe0Lo9RAJDFPbXBDhGBKC4XcPa8z3fNd4L4fb?= =?us-ascii?Q?LuSwp5pAVeD/bOx1qdvlsumuzYldqU5w0fi99eUvihT6jf5XSydG2rXIU70e?= =?us-ascii?Q?/gAAp2vaig2ALgAvQoPH7HcCHAZfqr5CQazMNYOb6TX76do+3e3+ceZsBzHD?= =?us-ascii?Q?C5q1X8EP0J9uLsq7fiOjens5SDQE6CAEPxMfK6+arrxh8qlQ67McU3MGmpKi?= =?us-ascii?Q?sIOT5cQS8V4PIpBRoQKEb1z+SnuSXfFJJZp+Ong9oLrkAi3Wmsfrls+tXxmI?= =?us-ascii?Q?CY7TgeWHSY0xhrNa8VaMNrIY+MgYx3ZbOKkheBt9L/a8hWnh+AmIsjKuMBPy?= =?us-ascii?Q?HZZjdIhJIVdZOqtlTi+4r/Ei0YvR2dwMOMVF9TXV6TrEfyWbiYMz585pbTW7?= =?us-ascii?Q?JfXYhMMCZQzzeMKIDRds0HADbe/eAVobQPoxfJLhev74qPDAP7wz1m6DAyp5?= =?us-ascii?Q?2Ydu77zUDDpHxkbuhs+BHSTKB01SGfn4rIQec/2C6LFgdTncM7W3dRQ5HMTR?= =?us-ascii?Q?IGlgKQbdkoJdbkYgkt0x4bKL4XhJ4O06tkW5r2tlG8/vqhLNsB/qlGxZvHN0?= =?us-ascii?Q?p5KBs5+d+epyLKrqIxiAcJj9TqrAuxP29F+ikITlUIaQ96q4o4vtjC4705Mw?= =?us-ascii?Q?YPOjdvjJzpOb6X1YeoK54G2q3SHwKgKTQkm2dufS3T+3NPiURrAWk+WyYTDa?= =?us-ascii?Q?S5PH8iaIdaQdYFrw2dpuwEutbWtw0Iq5mCvcTwBdQYmnoBYODUU0S64qlXgo?= =?us-ascii?Q?Jc+CrBcqWwanYUNVxfH2v6CapODHJrlBAv8RVpoqpcvSRCsrph0nQ9GBC66N?= =?us-ascii?Q?rFl3mEP8OBa/g3CQRDUnDeRxeH6jksddkFsVt4cbF7FzSDIv9A2wZ4dLGyzj?= =?us-ascii?Q?ZrrBYzNJOEY99sWcoOMcRkD5cmSRbINyPAEqtvyjDIrHjM8VkSp8Y22IH+CG?= =?us-ascii?Q?ktg+fE2ut7tUaUph3jtdQwFCbY3G9BrS3Obrk9ZiTlzgyLHoRpEzYOk/RZcf?= =?us-ascii?Q?sLNsdlsAvjcWDNnMbc5WtbnqRfugQErk84YAGhPEH4q7BDQoRUoHCxoWKcEw?= =?us-ascii?Q?cAYDJRYVo/ijt7j+pkvh5IUHpjpJcv/8TqFcOefj/lIvyDuayMsrT38rDrzt?= =?us-ascii?Q?/Ae37CGQ0hzem5qkYXGcNSbmVIj/PJt8B88eqMdIuUQdFQ/xBZr7F+Czjhd+?= =?us-ascii?Q?Tr5QaKZFLu2H/XmKs/0NI0/XU5KUNmdWIKb217kjMQwXGEn1jMmQQqQ3eKBl?= =?us-ascii?Q?wv6+9bIkwu5qXrCuKAMEPZjztUQudHk7a8VMux1wf7qp/2fun2adr89t5r1k?= =?us-ascii?Q?0iWl2nvCAsWdNYaFWfKM5U4FNpM1NKSxXQvpgU5mM7v7o8JEFX/7xmHe44+0?= =?us-ascii?Q?oJI5fEdvvHnv0twAjIyO/WDZtWwFqbDkTGlGFw1WFHN1Q/fNV6gUbttaBl3N?= =?us-ascii?Q?rhH+9c+XkbUF8sobaSeveA6UeeQL+ps2WHwc?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(7416014)(376014)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Apr 2025 19:00:45.9083 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e584fedd-2e6a-4dc7-0024-08dd8686fb95 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: BN3PEPF0000B06D.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7280 On Mon, Apr 28, 2025 at 09:31:31PM +0700, Bagas Sanjaya wrote: > On Fri, Apr 25, 2025 at 10:58:10PM -0700, Nicolin Chen wrote: > > +- IOMMUFD_OBJ_VCMDQ, representing a hardware queue as a subset of a vIOMMU's > > + virtualization feature for a VM to directly execute guest-issued commands to > > + invalidate HW cache entries holding the mappings or translations of a guest- > > + owned stage-1 page table. Along with this queue object, iommufd provides the > > + user space an mmap interface for VMM to mmap a physical MMIO region from the > > + host physical address space to a guest physical address space, to exclusively > > + control the allocated vCMDQ HW. Thus, when allocating a vCMDQ, the VMM must > > + request a pair of VMA info (vm_pgoff/size) for a later mmap call. The length > > + argument of an mmap call could be smaller than the given size for a paritial > > + mmap, but the given vm_pgoff (as the addr argument of the mmap call) should > "... partial mmap, ..." Fixed. Thanks! Nicolin