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Tsirkin" , Nicolin Chen , Niklas Schnelle , Shameerali Kolothum Thodi , Yi Liu , Keqian Zhu Subject: [PATCH RFC 04/12] kernel/user: Allow user::locked_vm to be usable for iommufd Date: Fri, 18 Mar 2022 14:27:29 -0300 Message-Id: <4-v1-e79cd8d168e8+6-iommufd_jgg@nvidia.com> In-Reply-To: <0-v1-e79cd8d168e8+6-iommufd_jgg@nvidia.com> References: Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BL1PR13CA0222.namprd13.prod.outlook.com (2603:10b6:208:2bf::17) To MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 1635b9d3-f7a0-452e-2802-08da09049a73 X-MS-TrafficTypeDiagnostic: MN2PR12MB3951:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MN2PR12MB4192.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(83380400001)(7416002)(4326008)(2906002)(86362001)(508600001)(8676002)(6512007)(6506007)(6666004)(5660300002)(8936002)(109986005)(66946007)(26005)(66476007)(186003)(316002)(66556008)(2616005)(36756003)(38100700002)(6486002)(54906003)(4216001)(266003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?S2yhHRj0f6P1CUo2fSoLvXo11IFr4DMNN71inpv6buePjayjaoDyymA8uS8K?= =?us-ascii?Q?O68MBezijp/OxcIN+h8MI1X8F1VdagiM9qfr5Jr8HOWbTg3NNCpylneABgfS?= =?us-ascii?Q?jpNcxsszrIm1PADVPwWRjVaLu5/5bzVQ0zrGgOFVcx9urefSb3OvGZXDVL7s?= =?us-ascii?Q?IErWHVVpMzcISSyTfWZOZYW6k3ewTwLaUrDpjbWROI1UX7driGiuUbHbvPRr?= =?us-ascii?Q?AsADiIvW2w69+UeoceCyB/3NQBhEY+rbJ0FCRnB+v9KAcJVRQBa5js+iMkzA?= =?us-ascii?Q?ZlaEvXcf71X7aCzegvg51ciIbRD/Cyt+aQ2pL3dHy+j39lGE25ql7mZzLQO/?= =?us-ascii?Q?tyOzVQPtXWkMPysDM0HPCZzgeTOIed2kpTzp9umXbrvd7QZfOarUCe+u2XQz?= =?us-ascii?Q?/xAKkARsunKOvp6H+OjPu9xgsjKMDrW35RhVnURtsSG/SjBXRmf3Db0H62Bk?= =?us-ascii?Q?/LXN1WxZbkDoKjNGeJ/FEINhJsx617uhmMHP7MhFx6cXbUCtp5YFzsQnmHPY?= =?us-ascii?Q?gBFc08AK+pe35pNIZ8X6670sMU6QIWpAuSbKBoIm1GiNVDDb+EUlcXTA79k2?= =?us-ascii?Q?USs2FmW66skeIkIiE+Y0IIaMv2AxPaKGbN9zerRlV7VEuWYd73poMuyxyg4Z?= =?us-ascii?Q?uhuLDFeaI/JMt8ybxBfQJC2cZNG5A7Fp8O9xqpTQw/T83n3mEosGxjGbCART?= =?us-ascii?Q?+PWZxYmt7QCbY2m5arqfQXhs1eJEPR4SVNwi6ZfCkjV7atPFmaVNdzMdOWq5?= =?us-ascii?Q?WqWoC/zjFBi54L0dn4sDj+orZjrdiXRdzSI7urNQE/fmHgeAPCchOtnBUGbI?= =?us-ascii?Q?AIlmkXeqvCk71sG+VvRvtSe8MgIDO8b6G3lhggwbLGEJb09fWO+igV6xVa5S?= =?us-ascii?Q?J1NMGpVMtbCrG5mIYnnyXb56jpeLicMkaN1MHtKjhn1+8v7APE0/L1ecKxE+?= =?us-ascii?Q?UtB2+7f2rVOzFY5FGNN//uFNJK+VHvGqVt5qoSxiGPaJcmNZJF9pZjmblZ1+?= =?us-ascii?Q?B9kKMSPtNWUc88Jm6ySiiV0SYN2bWnbUE3gJeCJmwM1pYXAV9x/a+M2FLZnd?= =?us-ascii?Q?IyQB0m1/TEre4dhbZSzuPOqzB4g8SxdRQrZuhAMlkjPCXPKa88S7FbQ8D1HB?= =?us-ascii?Q?P6GiDV+ARDBF5q2aWa0RMiQwJeMBpj8rAaZwS1nIow6psXO6LKOzVsMictcv?= =?us-ascii?Q?0NqUu/JH7S0GSgQk4vWtH/CTFeFLihE635uvvPH+Emka6/zDmQMrvzoxkCff?= =?us-ascii?Q?tljs6O3G1YC0/KQP6XlNNYNK7+4OxiIiL98lEhSok4HOFAX1hB4p9BJmpBQV?= =?us-ascii?Q?ErCVlrOBhSzeKaMnh4KqJBF+Kj+7IcOP4wal7w1dtPX/I24bY08WI+V2MKsj?= =?us-ascii?Q?guv9xhQ3JKJgBetZ8Thfzfzdfv1gtEnx1oqtpg2dWaAlHfm7Txm46Ns75ld+?= =?us-ascii?Q?TmvWrQuEvvA8SZJo9K0F+uZj9gKRskqF?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1635b9d3-f7a0-452e-2802-08da09049a73 X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB4192.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Mar 2022 17:27:40.3666 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: C0ElHAne2/uvwNxXc1zyaJLrmZqu/IWeDmq+AkrXvqD/oNqznDHFKABLjK6Y0llu X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3951 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Following the pattern of io_uring, perf, skb, and bpf iommfd will use user->locked_vm for accounting pinned pages. Ensure the value is included in the struct and export free_uid() as iommufd is modular. user->locked_vm is the correct accounting to use for ulimit because it is per-user, and the ulimit is not supposed to be per-process. Other places (vfio, vdpa and infiniband) have used mm->pinned_vm and/or mm->locked_vm for accounting pinned pages, but this is only per-process and inconsistent with the majority of the kernel. Signed-off-by: Jason Gunthorpe --- include/linux/sched/user.h | 2 +- kernel/user.c | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/sched/user.h b/include/linux/sched/user.h index 00ed419dd46413..c47dae71dad3c8 100644 --- a/include/linux/sched/user.h +++ b/include/linux/sched/user.h @@ -24,7 +24,7 @@ struct user_struct { kuid_t uid; #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \ - defined(CONFIG_NET) || defined(CONFIG_IO_URING) + defined(CONFIG_NET) || defined(CONFIG_IO_URING) || IS_ENABLED(CONFIG_IOMMUFD) atomic_long_t locked_vm; #endif #ifdef CONFIG_WATCH_QUEUE diff --git a/kernel/user.c b/kernel/user.c index e2cf8c22b539a7..d667debeafd609 100644 --- a/kernel/user.c +++ b/kernel/user.c @@ -185,6 +185,7 @@ void free_uid(struct user_struct *up) if (refcount_dec_and_lock_irqsave(&up->__count, &uidhash_lock, &flags)) free_user(up, flags); } +EXPORT_SYMBOL_GPL(free_uid); struct user_struct *alloc_uid(kuid_t uid) { -- 2.35.1