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Wed, 5 Mar 2025 11:46:25 -0800 Date: Wed, 5 Mar 2025 11:46:18 -0800 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , Subject: Re: [PATCH v1 0/4] iommu/arm-smmu-v3: Allocate vmid per vsmmu instead of s2_parent Message-ID: References: <20250305165452.GY133783@nvidia.com> <20250305183151.GE133783@nvidia.com> <20250305192950.GA354511@nvidia.com> Precedence: bulk X-Mailing-List: iommu@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: <20250305192950.GA354511@nvidia.com> X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS3PEPF000099E0:EE_|CH1PPFC8B3B7859:EE_ X-MS-Office365-Filtering-Correlation-Id: b7f96686-3290-4cdd-c595-08dd5c1e70f8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|376014|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?mcNIUgMRv4vDLfJZqVzEwP1ViNC1TytvkcqcN65OpNLInSDdzXrbQPdzw1Rw?= =?us-ascii?Q?K+yQ7uQM33mlcV5gaViHh4tcW01tGmwu5X95CpaYnxnWtMeNk9JZ862Q4deM?= =?us-ascii?Q?P2XxKN1tjakGC9mlc0g6lvb+wN04GiZe1mkw10guUA+rggYWsiy8cdm9wUrj?= =?us-ascii?Q?KquoPS8WZPAX7qm9DjYfiAugLT/DGA7DVElJ1lQZq/AWyh3bSBN/EaCZftvw?= =?us-ascii?Q?hmmopbKIJblPzgqzhWBhekahJKSoTbl8JNwLOnDZXMd6xYrt2PbIJ9+mwxqZ?= =?us-ascii?Q?rREUvUnu03EF5pZND7kWJuSdvfMB5EJN7RGzH/3eiOB2qTMmVc+U0ClqRI2q?= =?us-ascii?Q?0tfyNaFiFn4HNgXpDdgBBSjq4QJ1x0b8UH+tHiGUDjJl/g6h1+BJod3KG0vO?= =?us-ascii?Q?booyhdiTbB/dQa4HGx7ZCekCLaNTRV1NuJUOyuJJYghzv2U8IArBLJw8Wc7F?= =?us-ascii?Q?zcdwOuOM0nHjV2vbCCJI3fKNmDlTfefH/hbJoEI/dRD/1kIR5LWX6sf02lAx?= =?us-ascii?Q?mpCbmMIHjDRH+WcZLW8gsDEs4HRu3MotHKY26Oroz3i+dGikWsNGWGgYcyV7?= =?us-ascii?Q?oXXozNAIXrWBHOAQp+uH3d/LG1goG0aj6ajatP1Au6Nxfroz16zv8rJqTNdX?= =?us-ascii?Q?vWmeU9LcnvnKuPZGiApbrU/n8SfFvxnzelBW2KOT1zGYzidH7dAchsvIt5gN?= =?us-ascii?Q?fyo9zcRXH/kiQqXOOlAzp2Huc9WUut5x2KXgPawrc2N6MsbcF3PawTQhuzYS?= =?us-ascii?Q?mj21pnjaE0fDn/CP+wmMIu36bihnj2EeNhs75HKmoh3TkUOt5fJlZaWTaBZS?= =?us-ascii?Q?H3UANDOfXB5zQRuA2GBWYlWvbwpKodkxXGmf4oP3jT5qfjqxC2DpQZ26xJpc?= =?us-ascii?Q?rj5C/Hs6PkFgs6H7HtinlY9rGABwNm07+1AichCnqZf3so6qRlyNTM99Icga?= =?us-ascii?Q?cGy5uvIoZ7qSLZ6xZh/4GRWD+Hc3J0Nbxd2rd+BIUdTuh46bcnGQSyMzeqrc?= =?us-ascii?Q?/86c/xHEwsmwqWJSZQ43nyAknTWmI+O5SMSII1IOxpO5rqX8TKcvHYFFNhAT?= =?us-ascii?Q?OX7gmLzgB6FMcXj/8MzhbRjcjaIkiAaoSU34XqTF5t9mtktGpglpuEs3VKhh?= =?us-ascii?Q?sJ/fiiJZkMJZQtq1v6263tUt9On2CFjN82iHlHWNKW2sbqcFRb3BXP4KVoI3?= =?us-ascii?Q?VKnnGgYSaYMR+NlUZCBVd8zfpqeWBTUZTKKybvuytie/unRbE8LgyuhoIjP5?= =?us-ascii?Q?6EV5K7to9teZ7YFPEoIIKnLlSE4X2WJFFFyEMhMvRlckrXLVry1vZb/MLOZk?= =?us-ascii?Q?8VoIMrKHoeq+HiW+h3ozmi1JBvAw6Mcuu0s1aIAbqoTYVDWSebRboQtWGuvk?= =?us-ascii?Q?H7qlVBmSojMIVznkb0orgvw9jSkf8ksJsL9AJuttxRAokKgxecKWI9hM5/vC?= =?us-ascii?Q?wDzRH0YUwjgjO6xRqz2ok3weYptEbqr/qgvwgbe4w2GC7vyjsjAZhY0IzYvx?= =?us-ascii?Q?N9Bt3/yIZgzRpiM=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)(1800799024)(36860700013)(376014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Mar 2025 19:46:36.9041 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b7f96686-3290-4cdd-c595-08dd5c1e70f8 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: DS3PEPF000099E0.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH1PPFC8B3B7859 On Wed, Mar 05, 2025 at 03:29:50PM -0400, Jason Gunthorpe wrote: > On Wed, Mar 05, 2025 at 10:51:38AM -0800, Nicolin Chen wrote: > > > > I mean a normal S2 domain attaching to multiple devices on multiple > > > instances. > > > > Oh, I haven't thought about a !nest_parent S2 case. > > > > A nest_parent case will not allow devices to attach the S2 but > > always to a proxy nested S1 as we discussed previously. So, I > > think the implementation could be very different? > > It could, and that is what you show here > > But also, it could be the same implementation. OK. Obviously I underestimated this part of work. Implementation aside, this at lease needs some assessment of any invalidation impact. I should do some extra tracing. Thanks Nicolin