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Thu, 26 Jun 2025 11:51:15 -0700 Received: from Asurada-Nvidia (10.127.8.13) by mail.nvidia.com (10.126.190.181) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14 via Frontend Transport; Thu, 26 Jun 2025 11:51:14 -0700 Date: Thu, 26 Jun 2025 11:51:13 -0700 From: Nicolin Chen To: , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v6 24/25] iommu/tegra241-cmdqv: Add user-space use support Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9CF:EE_|PH8PR12MB7181:EE_ X-MS-Office365-Filtering-Correlation-Id: a518ae83-7768-4082-46c3-08ddb4e2761e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|376014|7416014|82310400026|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?cQtAq2u/2m5DzWtVIrjppZq4S29bDmQhdJidlFnXp1s0xBtjEwLNCfteCg4X?= =?us-ascii?Q?gUytKLph04XIWkhFLn2DgL1VQrOBYcL6AgGk0T34hDozQa5SDOd6w1vSPo7e?= =?us-ascii?Q?fGSMqi65LyEtEub4VbRSN7Py0S2kk81A6ycfa5a+ROUz85EgGRbtRQXj0M51?= =?us-ascii?Q?bHP02/y4VbBKP/ERAIg2/nR7kUWkSIWWZz/UBFGqo6yCwXGgz+UcQg53+UGZ?= =?us-ascii?Q?c4sYZ0SInCKTDUwtwXbMkNZKv37gohq2SvW6uJAkCTxGfsQY/ERoNQmsvRve?= =?us-ascii?Q?khx/CGXz4ewWdaxA+WuQYwni4bt7gVXAcZndgmnjJA1l/VNKOTnWyi0Ji5+i?= =?us-ascii?Q?wTNbDQUe7s0j8GCXsnbA6ZLCQ5qvR1bNhr0WP/WVv39Z5KASW8qQJKvYmFMF?= =?us-ascii?Q?g21u0UnMX1AIhrYyscFNcv4pHU9US3NVfEGv4KZEZVuMyPhQR1s7xkv6K1x1?= =?us-ascii?Q?HDWc1I6m+S3FQUhKEX0IvEmSKd+CG+0mB6CyxXE20iJu8QH3VqLs8fCVS5b0?= =?us-ascii?Q?yiCDTCoq0h6sPIgjR8x3j64gfWhE33f1aT6JOCA/1rD4vXacuhFZeiL32KAB?= =?us-ascii?Q?XSSC6elhHf0tuAnBU9IG4PHzJp89/0d/lHNllWC60vxLKEgrq0rZG+2RuSKD?= =?us-ascii?Q?kcgr6fUoexQTeBxnd6cdkbPvQBifCmWAIF3/sSwGkRsKmENW6J9IGsKx/L0q?= =?us-ascii?Q?Py+HYhJPFmUUcDwpJaBhlgLZgWZ0cU2E6jjidN2rvH916U8JwiHwfYJ9hSnt?= =?us-ascii?Q?HkcbpqTrSF8xQaQiCrWz1gYC/N2SE6vajPTezeo8xlL01Nzsb/oPGh1erYVp?= =?us-ascii?Q?yL46DXTC37CsKHuNQVDOPRcdyJwPLmbiSJBgpVjDvPCYRCwryHX6WJdP8dvg?= =?us-ascii?Q?l0GR3MY8EdHe1OB9HPTjOqq4EE/Kd5Itf0JXqLzQ7Nhj8+1i2Gy9DmZXX1L7?= =?us-ascii?Q?xIPOE7Llku0ekQm8ceZhXEs0HYUtX7d4NhGcZfkDLrwWn9KzTy9yCzJNLcwd?= =?us-ascii?Q?ZjWmc760gU1tiqbVrBxAaQb+LGdg0WfD1TKF++NcXt7AAo7OadKXDsjTYStE?= =?us-ascii?Q?946x6GVH4HoeRdykeWWhInA7RNE10t83YG5v+EkUfjXAmgLGcyOt7EnKHiaF?= =?us-ascii?Q?u8lk0U1vF4AE1qo1rJI8/pzLAItBNMrnp5IJ9KfnIWRzH+zmqphr951VjLJG?= =?us-ascii?Q?vGkGgs6cTzp0wTEr89WUUNwjpvFUua29kYlGnVZ2swEpcWyWIjoOMsNpx3N/?= =?us-ascii?Q?ZC3I81COxWJzj9DtqT3U34cU3vubgf2Q6E7pM4x1pNoNaQ2X/tSCA7IIK+ba?= =?us-ascii?Q?iTnV3ZidKYhpj8vD1en3uL5T8CxLtq0XWAR6Sr7dk4xM9GN+hZHGv9PZXEsD?= =?us-ascii?Q?225F5TmgjtWrW9qe33cjo2DwoH84KP2PSTNNkMj3xWYfTbhv1a/s8BLMdTKs?= =?us-ascii?Q?6UmoliutnF8gQj/efEuUxDr+kYw+ZVYbd9LcmpSIWZECMsOraSRfbLR2J8zq?= =?us-ascii?Q?l2qzbLB5YW3e/m/Oh5wzuDUMREnSMp+OYuCd?= 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)(36860700013)(376014)(7416014)(82310400026)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jun 2025 18:51:29.2763 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a518ae83-7768-4082-46c3-08ddb4e2761e 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: CY4PEPF0000E9CF.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7181 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250626_115136_745237_09F5C531 X-CRM114-Status: GOOD ( 15.04 ) 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 Sat, Jun 14, 2025 at 12:14:49AM -0700, Nicolin Chen wrote: I made some small changes: > /** > * struct tegra241_vintf - Virtual Interface > + * @vsmmu: Embedded arm_vsmmu structure > * @idx: Global index in the CMDQV > * @enabled: Enable status > * @hyp_own: Owned by hypervisor (in-kernel) > * @cmdqv: Parent CMDQV pointer > * @lvcmdqs: List of logical VCMDQ pointers Added: + * @lvcmdq_mutex: Lock to serialize user-allocated lvcmdq for the following change: > @@ -154,19 +172,41 @@ struct tegra241_vintf { > > struct tegra241_cmdqv *cmdqv; > struct tegra241_vcmdq **lvcmdqs; > + struct mutex lvcmdq_mutex; /* user space race */ [...] > +static void > +tegra241_vintf_destroy_lvcmdq_user(struct iommufd_hw_queue *hw_queue) > +{ > + struct tegra241_vcmdq *vcmdq = hw_queue_to_vcmdq(hw_queue); > + > + tegra241_vcmdq_hw_deinit(vcmdq); > + tegra241_vcmdq_unmap_lvcmdq(vcmdq); > + tegra241_vintf_free_lvcmdq(vcmdq->vintf, vcmdq->lidx); > + if (vcmdq->prev) > + iommufd_hw_queue_undepend(vcmdq, vcmdq->prev, core); Added mutex to pair with tegra241_vintf_alloc_lvcmdq_user(): mutex_lock(&vcmdq->vintf->lvcmdq_mutex); ... mutex_unlock(&vcmdq->vintf->lvcmdq_mutex); > + /* > + * Initialize the user-owned VINTF without a LVCMDQ, because it has to > + * wait for the allocation of a user-owned LVCMDQ, for security reason. > + * It is different than the kernel-owned VINTF0, which had pre-assigned > + * and pre-allocated global VCMDQs that would be mapped to the LVCMDQs > + * by the tegra241_vintf_hw_init() call. > + */ > + ret = tegra241_vintf_hw_init(vintf, false); Revised a bit: + /* + * Initialize the user-owned VINTF without a LVCMDQ, as it cannot pre- + * allocate a LVCMDQ until user space wants one, for security reasons. [...] Thanks Nicolin