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Tue, 11 Mar 2025 10:43:10 -0700 Date: Tue, 11 Mar 2025 10:43:08 -0700 From: Nicolin Chen To: Will Deacon CC: , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v8 12/14] iommu/arm-smmu-v3: Introduce struct arm_smmu_vmaster Message-ID: References: <20250311155714.GC5138@willie-the-truck> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20250311155714.GC5138@willie-the-truck> X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003F62:EE_|CH3PR12MB8330:EE_ X-MS-Office365-Filtering-Correlation-Id: eb47b2c9-3fae-4e78-4fa5-08dd60c4399e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|36860700013|82310400026|7053199007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?3oXrMpIVHQ5Cfx/LzaxXTHPpkfR5lXHosB6/gn6xuf7XSPVfKjnnDsQknbDL?= =?us-ascii?Q?FIiU/rQQyzzBqDhXv81ZyzW4zqWSrnMDYjeor/wbxX7JcUz+DJb2UaQ0RVhZ?= =?us-ascii?Q?8KEG/HP+PIgNzO1k6apvvsZXSq87PJcbvggEgoXBch6wOUJRaMDEGYRL/4DR?= =?us-ascii?Q?eJdN3PQpt6BgPhCjZij3d0x02RiDy9PjBsEUKOuyBfOy0p9GocyydNb04j8Z?= =?us-ascii?Q?y1z8t7Y8JJUBQjSU6tVqlZu6oAJogwDp87UA1mGaf4036xmKZ9wzpnQ6+Qhs?= =?us-ascii?Q?+O8QBKEUPh8OTsALOBdC7eZLVNZMfWIjsXSaiuhjP3MFReNUZ5uXuNKehLVu?= =?us-ascii?Q?DX60s7Ae6Yeb/WQzZ/xy8L5YXMoRX6Z2YoR3mR17+VgDRoWw6JPQk6IQvm3H?= =?us-ascii?Q?MLAzth7betRHgUrhYMqviyM7Bshc8Yhggn4lRENehdnqzvmFF247EHR5wQpm?= =?us-ascii?Q?aCN4j7sf/NJb6jxHnMgJJ7AsbtIUEs5p+PK6CeCRvSQH13NZft/Vyhi/+Zhl?= =?us-ascii?Q?DnLnaeagW3Jvcygm4XHDKT8ykt2lnm+gt2goJdPPsR/to8A/xnItZmXpUIZe?= =?us-ascii?Q?rLxbTHllvyD2EzvlMWHJQTIAXOE9Cv7to2x8Ad3LdwVgvD/WJzVPVTYWXCtc?= =?us-ascii?Q?mz58JC0q0/6CHsV1ghMQLUwaXOOqSQ+G25WR5rwVTkRSTVVnaWYHLUsNvF2p?= =?us-ascii?Q?C4zOcXJ5PgWSjayipoJFvS78Mo/KQ0W3yhMa93+Zo8gE2l2qZVKOlq1mNo91?= =?us-ascii?Q?KYaMJiKS3sHf+M4iHV7uBbsXxW5xvQxK9wDNNDXXsD6uACPUR+jB+PIwacxN?= =?us-ascii?Q?jIPK+0vTuAXWfO6pNIczXlYoZdacG2NoHSZ9qALWdqMuoToAwePVgZZaNZhf?= =?us-ascii?Q?Qa9PSkUT/BKcx7Y5kaarJjMo4zdaTndIGW6ZZgmwlOx1nIkSd3lw2mmDli4f?= =?us-ascii?Q?fXZp+HIwupwDtpA5Yr/MCQI+GD3mFFueooCfSfONh6Jid/mi/sS8FTSXxncs?= =?us-ascii?Q?MWgM2wHym30ShR3gqz9Gwgptx+Q1soAbq4R/UmCdyuViPkeEnTmD8lQBOfel?= =?us-ascii?Q?apz0w3bDepA+aMktzVYvUShY/LNcF9YDAcRz8JHtkFWdQwpT1KOSm9mXFtND?= =?us-ascii?Q?mHso6Kl8fnL9Fx6/4T2UCr5oyiak2dHriKWqXP9tPly0q7eWyKZqH4XyUweu?= =?us-ascii?Q?vYteoyizJqe4NL9SkB0ufSXtTDeajHvo2XsFHMeS0ZY7sYkUe5Dm25u8u4q0?= =?us-ascii?Q?d2imbJ5omh5lX3altz+awamUCHGCIz3/7qpzaO3r4N7rd7i0DgKGsmbQSYDH?= =?us-ascii?Q?GcJsCsnL1W3AkR0t8TwVB5kxUlavN5VXQHiG97/urobDrsB6h6u4EI8yeMkJ?= =?us-ascii?Q?YcM1fw8pdWJGZXV7cCK1itoSIS50STIucy+H21Ntd4PaIu5+FKXRySSWago6?= =?us-ascii?Q?y0x1H96JZ4p9cm+F0YGb1aQkNntDjsX/25tAhlcHvMvIu9LJuW2PFAZ3TIBv?= =?us-ascii?Q?CSy/ueGllHjMHQY=3D?= 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)(36860700013)(82310400026)(7053199007);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Mar 2025 17:43:25.1605 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: eb47b2c9-3fae-4e78-4fa5-08dd60c4399e 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: SA2PEPF00003F62.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8330 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250311_104332_932553_9D8029E5 X-CRM114-Status: GOOD ( 16.09 ) 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, Mar 11, 2025 at 03:57:16PM +0000, Will Deacon wrote: > On Tue, Feb 25, 2025 at 09:25:40AM -0800, Nicolin Chen wrote: > > Use it to store all vSMMU-related data. The vsid (Virtual Stream ID) will > > be the first use case. Since the vsid reader will be the eventq handler > > that already holds a streams_mutex, reuse that to fenche the vmaster too. > > "fenche"? fence :) And I fixed other nits too. > > +int arm_smmu_attach_prepare_vmaster(struct arm_smmu_attach_state *state, > > + struct arm_smmu_nested_domain *nested_domain) > > +{ > > + struct arm_smmu_vmaster *vmaster; > > + unsigned long vsid; > > + int ret; > > + > > + iommu_group_mutex_assert(state->master->dev); > > + > > + /* Skip invalid vSTE */ > > + if (!(nested_domain->ste[0] & cpu_to_le64(STRTAB_STE_0_V))) > > + return 0; > > Ok, and we don't need to set 'state->vmaster' in this case because we > only report stage-1 faults back to the vSMMU? This is a good question that I didn't ask myself hard enough.. I think we should probably drop it. An invalid STE should trigger a C_BAD_STE event that is in the supported vEVENT list. I'll run some test before removing this line from v9. > With the nits fixed: > > Acked-by: Will Deacon Thanks! Nicolin