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Fri, 10 Apr 2026 17:06:17 -0700 Date: Fri, 10 Apr 2026 17:06:16 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , Subject: Re: [PATCH v4 09/10] iommu/arm-smmu-v3: Remove ASID/VMID from arm_smmu_domain Message-ID: References: <20260410002734.GC3357077@nvidia.com> <20260410232500.GD2588311@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260410232500.GD2588311@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE33:EE_|PH7PR12MB8107:EE_ X-MS-Office365-Filtering-Correlation-Id: a6eb531b-4319-4633-e982-08de975e31de X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|82310400026|36860700016|56012099003|18002099003|22082099003; X-Microsoft-Antispam-Message-Info: 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 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)(376014)(7416014)(1800799024)(82310400026)(36860700016)(56012099003)(18002099003)(22082099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: fb299x5173lYveXVcMujEzuP71wyO8az44/EyfpXOdoRY8qrWI5ShbCx135hG3sS3iSJbMegMeX94CRSmoO1wmzNzXgA52CxsoSdwdpMS6v6y26PBwzdnf92NjFn7BH228N/6yMj9ze/JCk+Z7VD6SgLfvAWITINxNNUzFZ0aqIZqXSerdSs1WadPi2m0kjTPmqHhgHuYTiYEQfPToOk+u8/ItjwGDQKehsw1KD4q67lzkl6EdgWKjIjg4L70ynyO/ITIl7JnYEblU4Fhdwdzo6v0QFLX/Ji1ChM2WEqnt+ElxYJAPoBjVtiPe0I57+yTnfyWtpunMdefhpIy8saLmdq6PXz1Y+NvgS63+tafl0n87bjtJQffBO91lTlfVDE9AVafdY7IzEt7r+MLE2exEAvcigt9Z5l6vj2PSEzviBqwBOfuNy6aGvffdxEKl2k X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Apr 2026 00:06:35.1379 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a6eb531b-4319-4633-e982-08de975e31de 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: CY4PEPF0000EE33.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB8107 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260410_170642_536898_B5302A94 X-CRM114-Status: GOOD ( 13.81 ) 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 Fri, Apr 10, 2026 at 08:25:00PM -0300, Jason Gunthorpe wrote: > On Fri, Apr 10, 2026 at 03:06:32PM -0700, Nicolin Chen wrote: > > On Thu, Apr 09, 2026 at 09:27:34PM -0300, Jason Gunthorpe wrote: > > > On Thu, Mar 19, 2026 at 12:51:55PM -0700, Nicolin Chen wrote: > > By taking a closer look, I think either the arm_smmu_domain_inv call > > above or any concurrent arm_smmu_mm_arch_invalidate_secondary_tlbs > > call is a NOP now? > > That sounds right, with all the changes there should be no cache > flushing on the free path since it is now always flushed on detach, so > the arm_smmu_domain_inv() should be deleted here too. Yea, I did that. > > We reworked the ASID lifecycle, which now ends when the last device > > detaches. So, ASID was free-ed in arm_smmu_iotlb_tag_free() that did > > a per-ASID flush also. > > Yes, so the comment is: > > Notice that the arm_smmu_mm_arch_invalidate_secondary_tlbs() op can > still be called/running at this point. Like the normal detach flow > the RCU protected ASID may still experiance harmless invalidation. > However unlike normal domains the SVA invalidation will continue > into free until the mmu_notifier_put(). I updated that in my words but this reads more accurate. I will use this (fixing the typo experiance). Thanks Nicolin