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Wed, 5 Mar 2025 10:23:37 -0800 Date: Wed, 5 Mar 2025 10:23:36 -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> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20250305165452.GY133783@nvidia.com> X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B06A:EE_|MN0PR12MB5905:EE_ X-MS-Office365-Filtering-Correlation-Id: 8cdec9aa-bbb7-40ef-018e-08dd5c12e550 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|376014|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?3mclzFo72Gvt1Uu2hmZwWf5omGLR2PjH8arp+TImYMuDIWgyaWV5ttL1HoXj?= =?us-ascii?Q?8fAocu+tT+2NfGDvvKZYefu495Hi63JSRocu/J3sRVvYzk0Z6qv0Jahi4bRr?= =?us-ascii?Q?i9anQetyCN47GwiOmXdy8/n6xK3cqzuQ4EWtia7dMkHg+GcWsA5CSAl2ttlp?= =?us-ascii?Q?dLO5YcSJYAKTrediZAKR7JieiBkwamWkTHggT6a+bClvu+OMnVrT5Fhib7gl?= =?us-ascii?Q?0ifqMTFFVISDekNlrSLrVjuruOKzXRYkl1hYO2JXgBNE0SCUO0qQm/Ygz6y8?= =?us-ascii?Q?liBZU0Lsf7beJ+ACpoRi54pn8aQfOODCn7XN905UDLU8gMK90AFcc+A5fx/j?= =?us-ascii?Q?+pZFD/99+Atan+XN2IygwYNDHEHe8RN53i9lHGq5qnYnhLILHEdiyTqYAjCt?= =?us-ascii?Q?6BmTANagEKrtaZCJfwaYe/XOX8E9SyngnJC5nSY/I5tTQFbVRFmOJTtlkavY?= =?us-ascii?Q?bzNwQ9hxYkP4KbdJ77/9Vlpz+aw15KexE59BuhLj2VlSkJKdsbxWqnj+4s2C?= =?us-ascii?Q?zWBcc6feNWgqtTPFJziC7x5tcn7Rjajvd0jsL9FeSWUitqhpcRnu8g3Yvr5W?= =?us-ascii?Q?nDVicb2iI0086/lVfT5ixUo1kneiH260EsPbe1nhjKEQTMXbbCHTLkXxjc34?= =?us-ascii?Q?VDrgkEJQJAXr7DF8FGv6Hh3bMrOjFk8FkGydJvEmpon41xazC5Ps0Xm7/RZV?= =?us-ascii?Q?PRrTWLTAqZipk9zfT413eO3yNmNC0TbT4kC3nyaZPDuz5Ttt85PZ9nNlGE/p?= =?us-ascii?Q?jDyx6TaqYm/HPjBMs28JpkouMmGOqQtDFgMkCHh6+6zMqz1f8xDqVeIykacA?= =?us-ascii?Q?Vw2tNqY9CzXtqIX5rQ0Qe8oe0qKBXspA86dcGbs7ysSgqbgMzpa8uZ75M+0h?= =?us-ascii?Q?qMmDLV68zSiZGSV5vXhJ260/Qhgm0/Q5P1ko+b7G3JTNXL6Ykoxezffv4JIn?= =?us-ascii?Q?fxgAr6+/YRKAXDAFE973WCXdSQrlp2zNGG6/KgMjcRuK1u8mmG1alevHH8u6?= =?us-ascii?Q?VB84GWKjIDu5bX6AcUlDyy8dTX/pShsGNzv7asoCaRo9MyCm0xJ7nmOC9sgx?= =?us-ascii?Q?lK2saxgW2AMPCvZukQatFUwmQkwZx3BSgMr6v1JghFjpDrbYPM8vNQ2Tm/4Y?= =?us-ascii?Q?iyZAz/ALFkRxjJVoxAuD9X6YiPLMOKOie7NpIB1Gz+oAWjryFwlDSREe2/g1?= =?us-ascii?Q?nZFnUQaf3wAmQOsBs/qQyXMxfSPsIQI/3TwLFcMU8gZK0glCtSeuD02DoCB9?= =?us-ascii?Q?ZJq5Zj83NyNDlGTv30r8518iKmrjkc9r76J/M1aE41ChVGEL6lC/+quGXpP8?= =?us-ascii?Q?buQTtL6kOPgd237Ntvzm814ETzDJGJewrPRYiT18hJ4K9LYt9B278Z6jF5hD?= =?us-ascii?Q?/J3aidwHtb+Odf0IYikddttsVR/c8crCKygnAB0hexBPMXmVhdD7NMBpEGjE?= =?us-ascii?Q?5ScFHSQ8edH3vagAWYs6SW89+fcrIBx+MhEeSlUKOH5JBPqD2xI2pA0Vw+Sc?= =?us-ascii?Q?xqUuWFDgpMgW94E=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(1800799024)(376014)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Mar 2025 18:23:58.1464 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8cdec9aa-bbb7-40ef-018e-08dd5c12e550 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: BN3PEPF0000B06A.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB5905 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250305_102405_169874_097C8C16 X-CRM114-Status: GOOD ( 16.43 ) 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 Wed, Mar 05, 2025 at 12:54:52PM -0400, Jason Gunthorpe wrote: > On Tue, Mar 04, 2025 at 09:03:59PM -0800, Nicolin Chen wrote: > > > Have a pair of patches getting the functions ready for the vmid migration. > > Decouple the vmid from S2 parent domains and move its allocation to vSMMU > > instances. Note that a regular S2 domain (!nest_parent) has to retain the > > s2_cfg and vmid for non-nesting use cases, if the SMMU HW doesn't support > > stage 1. Then, an S2 invalidation has to be iterated for all the vmids in > > the vSMMU list introduced in the S2 parent domain. > > I was planning to also fix the S2 to be able to attach to multiple > IOMMU instances at the same time as getting VMID to the viommu.. It > doesn't quite make sense to me that viommu would allow multi-attach > but the normal cases wouldn't. Did you find a shortcut? Hmm, not quite following the question. You mean vIOMMU attaching to multiple S2 domains? > The main issue here was to do this without degrading the invalidation > workflow and harming SVA and DMA API performance.. I see.. The ATC_INV and TLBI_NH_ALL will be increased for the shared S2, even if the S2 change is about a device behind one physical SMMU. Thanks Nicolin