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Tue, 1 Oct 2024 11:40:11 -0700 Date: Tue, 1 Oct 2024 11:40:10 -0700 From: Nicolin Chen To: Yi Liu , Jason Gunthorpe CC: , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v2 00/19] iommufd: Add VIOMMU infrastructure (Part-1) Message-ID: References: <82632802-c55a-4199-b685-8b594a8e7104@intel.com> <8440cd72-ced6-4887-b724-ce6a1650db13@intel.com> <20240927122051.GY9417@nvidia.com> <20241001134815.GG1365916@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20241001134815.GG1365916@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF000055E0:EE_|SN7PR12MB7856:EE_ X-MS-Office365-Filtering-Correlation-Id: c13dc103-2239-4fe7-4d48-08dce2488686 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?6HZp8rwpTcNE9qihyXrZvk99HrweR6+JuRxYW4KesYub1RCyZm2F4vCbNNue?= =?us-ascii?Q?ybglHRUtreslOqcAiOlFYcL7RUMq/bNIWE0kI887CsWyKIiBXyCBS7scYFHE?= =?us-ascii?Q?civVcViEk3L33Vp0b7RbC9BwLL/1VE6jDetRkuMwI/HUdFsbJpbAt5xCmhQS?= =?us-ascii?Q?YNdCueu+4sLyfrzKlb+8AdFWajRJ/k6m26kRYrOAEk6oxvxUdgvG4g4PDkBt?= =?us-ascii?Q?Amav96050/YQrWwdUVAX9JlMPJAfPxY6hDFVJjrysd60aYDQh4zaJCQPgbBo?= =?us-ascii?Q?2Xt/vHPmbLNKjUZfeItR5pVmQkcO3J5o5aXAEIj5jxuX3rGjjQl/bUA+82Jk?= =?us-ascii?Q?mO0nDtSAWRhVRqz2xwWYuSWHOyYUrr0YlVU4kJ070/B3U+/L4+aPqUg2uci5?= =?us-ascii?Q?MDPQ256Ng7/zXz7jc43UjRXQ4c212UZAJQtRuc+LXnXCd4hwqNMQnlAmgd+S?= =?us-ascii?Q?VNpD92oAm9D1/Pe7SQXXmAf2q3a5daoQSOrxmC6d9Ft5jO98K3svBROD7VC+?= =?us-ascii?Q?SLu+VhuoE63vEybYtF5LMCvGPbY9WXR/+AYpIURYunR/zUNb1JVfQRMi+bQV?= =?us-ascii?Q?gkpaast4XsAmAYV2WsB6n42Oc4olLkXhz/KqThbTkXfDIXMjAtcDk4uU2oTH?= =?us-ascii?Q?PMGhS4LjwC3cr9HOgV+1Q15swKgHOuk8t1gii3N3BGZM5UDDgeLpFe38mGmj?= =?us-ascii?Q?byHyl2SF5/4ixmin1XOgYvPLaxdd/nYe0u3LKj9Kl6yVAdSNGbQvyPs4PKRR?= =?us-ascii?Q?AxhfJcvYNdoqdBqx+Wzr2NyUn8sUaQ5BQG3JMVLnK0ynARwP3L9xtYTQTmh3?= =?us-ascii?Q?x2AwNEQE/0xvuBrBlh+H4nb5ghj7EIow0t8eSUfEfS9bNdeZdCOGzTEXUexx?= =?us-ascii?Q?VV8KEwTOaDOAsEQWrfRjD98cD/mqRjOEr581hx4Du85NbIxDo3bC9D1dW6UW?= =?us-ascii?Q?f1HnjViQ3y6cw88v4wWwOTvBNjKU5e1CAi87NbVu6STVYh0wnzXKGqW6gibP?= =?us-ascii?Q?NubezQAg2/rhnEXr1Fr6I+wjyhVKbNRF379L0t7yGkpSv2qnyAJMONawqbyD?= =?us-ascii?Q?/U62yAancU6HGP8whKuqLEaj3AnAjNiNc2KC/qkW3Lm62Hsqr5DBXNDfDpBd?= =?us-ascii?Q?qQsbMP+kQWPXMMnUy9PUVYVyBlKfB0BYCaosFbuwlc9GbsmHj8nW5wnenoLf?= =?us-ascii?Q?koLTjSDyNSsRvCvQmWGOB2SO0cIaVN9BPA8wg7bSuOhjE2cmQVrEsgztXqw8?= =?us-ascii?Q?1oUtnF23NXMzAlk+PLXoJo505Lkz/+pgsz2/ABAJ9WabS+ddbfb3+PflYqje?= =?us-ascii?Q?kroGKcV7ei3iqasdV45F2+szP2HptudeOKa62YpHHWzL4G4wLrckTmqVAfiK?= =?us-ascii?Q?7kdYd0U=3D?= 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)(376014)(7416014)(82310400026)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Oct 2024 18:40:30.0364 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c13dc103-2239-4fe7-4d48-08dce2488686 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: BN2PEPF000055E0.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7856 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241001_114037_423651_C33A0F91 X-CRM114-Status: GOOD ( 15.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Oct 01, 2024 at 10:48:15AM -0300, Jason Gunthorpe wrote: > On Sun, Sep 29, 2024 at 03:19:42PM +0800, Yi Liu wrote: > > > So their viommu HW concepts come along with a requirement that there > > > be a fixed translation for the VM, which we model by attaching a S2 > > > HWPT to the VIOMMU object which get's linked into the IOMMU HW as > > > the translation for the queue memory. > > > > Is the mapping of the S2 be static? or it an be unmapped per userspace? > > In principle it should be dynamic, but I think the vCMDQ stuff will > struggle to do that Yea. vCMDQ HW requires a setting of the physical address of the base address to a queue in the VM's ram space. If the S2 mapping changes (resulting a different queue location in the physical memory), VMM should notify the kernel for a HW reconfiguration. I wonder what all the user cases are, which can cause a shifting of S2 mappings? VM migration? Any others? Thanks Nicolin