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Fri, 10 Apr 2026 16:04:47 -0700 Date: Fri, 10 Apr 2026 16:04:46 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , Subject: Re: [PATCH v4 03/10] iommu/arm-smmu-v3: Store IOTLB cache tags in struct arm_smmu_attach_state Message-ID: References: <20260409234223.GX3357077@nvidia.com> <20260410204709.GB2588311@nvidia.com> <20260410214115.GC2588311@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@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: <20260410214115.GC2588311@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002BA50:EE_|SN7PR12MB6863:EE_ X-MS-Office365-Filtering-Correlation-Id: f03c3bcc-27d1-474b-6045-08de97559b27 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|1800799024|7416014|376014|22082099003|18002099003|56012099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: CF6eRqVdcxdRKA4H/nX1BiWUOfHVS78A1Y1oRE9XYfRl4nPkVnV0kAVyTzQy4a4A71OqV+XtpKsZ1/l/ph4y+771LkPLO+Unf49FN6etQJYGc9l98kO0Cs1z1ptFr2x2GL0XJHQBOz/6IzmDz9yo5AyOy9wrTkjHiCqjApC+3RfFBGyoSL05oL/ybYQmM+jH5XoI06RCDVvijM8a3jkEaC70c1MXU98b5sIWd7/M9yoJbe7xYshiExsKoz3x0TmJX6h/lpea+3UGEtmrTR+aZH9FtJXn1pwmDc4BQUtIqKwAQ5VAOJ1UUVWZQWN6JllIdhw4rWCCNClfjnmggsIQ+iLqVXDFKiOZrV9TX/MXrSib417NPqtmghvvfK9KqPQCyHFqQld9jC37wZgShgHiLN4knJFWoogJ/0iWRQmBfb5uBPoR5FHU3bFAKIaOf0Lt X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Apr 2026 23:05:06.2860 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f03c3bcc-27d1-474b-6045-08de97559b27 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: SN1PEPF0002BA50.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6863 On Fri, Apr 10, 2026 at 06:41:15PM -0300, Jason Gunthorpe wrote: > On Fri, Apr 10, 2026 at 02:23:48PM -0700, Nicolin Chen wrote: > > > Reworking the SVA code, I found arm_smmu_update_s1_domain_cd_entry > > is marked as __maybe_unused and not getting called anywhere(?). Do > > you recall why we kept it? > > I intended to send the vBTM support that uses it, and now that this is > done it can work properly without races. So lets hang on, I was > meaning to look at that soon OK. I assume its caller would hold arm_smmu_asid_mutex, because it's calling arm_smmu_find_iotlb_tag() now. Thanks Nicolin