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Wed, 23 Apr 2025 00:45:16 -0700 Date: Wed, 23 Apr 2025 00:45:14 -0700 From: Nicolin Chen To: Vasant Hegde CC: , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v1 00/16] iommufd: Add vIOMMU infrastructure (Part-4 vCMDQ) Message-ID: References: Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org 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: BL02EPF0002992E:EE_|IA1PR12MB9466:EE_ X-MS-Office365-Filtering-Correlation-Id: 92e077c5-227a-4d3c-eacb-08dd823ad5ff X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|7416014|376014|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?ptrrVyCrjwBxyOQgE3gVxguJHyGHuJObClihX3QFBca7TAjHnd8GRLtiCfHF?= =?us-ascii?Q?SLCMxNfk3JxnnKydWk8ICZK3vFEXhL5riYj8EpJkXC2BesKrAbm2AHhnbr6C?= =?us-ascii?Q?2FqjEyO+3SMq0EjfXpfOtGsGVVzyAjfeuT3P9OB15bBKeoeOfFxnESEJGM4W?= =?us-ascii?Q?1Z+PSc9Bm2oHJVn29Y5Vy2JL0Dhuo9Dfk9fQr9v77uCDB4yPFaWZdcoj0Rpk?= =?us-ascii?Q?L3ZtlgxCbc3o5En+4Cq7vFKWSF/KgRa2rE5/SAkWyUvK5srbaukpTj47mZKL?= =?us-ascii?Q?B3LGdO8kk8JbCjBY33LDXxJiu9DJiiwUo3+rTpxF384XitDjv2plKUwYIxXR?= =?us-ascii?Q?/WM9/Iir0LKwb/uWUUr/MCsErSJRCZJL6TqI7UDv5E8ouKRZu83vpn0kpFKz?= =?us-ascii?Q?yvtoe2hrIxS4GJH3PtlAeBGUkA4pFzkB/3N2pXrrUI2P3u24I+pHCQzmzK9M?= =?us-ascii?Q?OKpLhUXrwaivy1J5Ka/wW9o+AWEEq0az05EI+X/B+2w5FxJoS+s+trkMSARK?= =?us-ascii?Q?5pC4MbrG93KJFD1yR6sPZ1LbEE9u1hmJ3djEzW1Acbtnall1lGY4grtRbQUo?= =?us-ascii?Q?OiFdvlbTXWVtbqMWGSMt9TesWV4wfM9SuJrvLu6kXWzZ3ECRO+EBfcJ0g/VF?= =?us-ascii?Q?b4LibpvV+L+89QZj8R4YdqzaqGggZ6cSXAFDl4/bwsnZDKz3PGbyMOODTIqn?= =?us-ascii?Q?hVLCtyAglxVU3KBb4AqaBCn8tUSi8ICUkUKL2NhR3veN9ll/p3fQ+M/tZpgx?= =?us-ascii?Q?OIoPUAnj+xZZCakH9Cdtc1Cqfz5xyxMCakgOiaVN+IPj74keH0+1tmodfI9C?= =?us-ascii?Q?o1+U8LHoA147mnq9p7tkt6elGiYAj34+UYn/crWDdsN8MkVmrO2/FmMSAX6Z?= =?us-ascii?Q?YQw+S1VF1XdJKIE2qpYovxwgXdPLNbX+R7M/04T0n1+NZ1avq8FO8T/BfEnv?= =?us-ascii?Q?s0VnBzd4s7NG3IKIEYNJjnCsMs4GH9ylWlJpK+McPzOyo6XXa3c4WLAr58n/?= =?us-ascii?Q?Zyu7olkQ/nxfe4RnhepugXFq9qugkX5vmi812fBR7O/iNXqRorFAIYifrvJy?= =?us-ascii?Q?SLRMErL2SAFK1n5jjVQLX7ydQrierS64iO+o2am7PHNhGfPm2OPy+js9/m2I?= =?us-ascii?Q?htENRTfWZgYlmYXoIL1zyIpgl+DrE0QHRGsovsXXP4Du0BsslzLYHt1IZ17G?= =?us-ascii?Q?n22yuNM4cNL8jjT2VNq5hcVeA05xGvh2meLPGH4VeKDcFYqqg0d6ry8MHn4P?= =?us-ascii?Q?JnC9kDc0wAHlkVqq3qo8z7P4ChfD1PrKn9dYMkWbnmjc6YduN4OUmpH1P9ww?= =?us-ascii?Q?nZMbqWTwinilyH4Edc/doJioOoHGs5a8x3OYHq5OguGGw8tGZKIphsypxzX6?= =?us-ascii?Q?dH5D3cq53sqqKXyHRjDXX1aY8AmBT/dPm49VMGqSPThDmeVkM31npDeG1q9I?= =?us-ascii?Q?tXqZCw2oxO8Fl0nzbDlssSTF/DQU0VWMFcq1jaQN+NshQfHUwt0a2kAyfFow?= =?us-ascii?Q?s39sAT2CVNCEgqWmwZOWbnYcD6FOAKs1eRMu?= X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(1800799024)(7416014)(376014)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Apr 2025 07:45:36.4526 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 92e077c5-227a-4d3c-eacb-08dd823ad5ff 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: BL02EPF0002992E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB9466 On Wed, Apr 23, 2025 at 12:58:19PM +0530, Vasant Hegde wrote: > On 4/11/2025 12:07 PM, Nicolin Chen wrote: > > The vIOMMU object is designed to represent a slice of an IOMMU HW for its > > virtualization features shared with or passed to user space (a VM mostly) > > in a way of HW acceleration. This extended the HWPT-based design for more > > advanced virtualization feature. > > > > A vCMDQ introduced by this series as a part of the vIOMMU infrastructure > > represents a HW supported queue/buffer for VM to use exclusively, e.g. > > - NVIDIA's virtual command queue > > - AMD vIOMMU's command buffer > > I assume we can pass multiple buffer details (like GPA, size) from guest to > hypervisor. Is that correct understanding? Yes. The NVIDIA model passes through a Virtual-Interface to a VM, and the VM can allocate and map multiple command queues (buffers) to the V-Interface, by providing each command queue info in: +struct iommu_vcmdq_tegra241_cmdqv { + __u32 vcmdq_id; + __u32 vcmdq_log2size; // size + __aligned_u64 vcmdq_base; // GPA }; Thanks Nicolin