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Tsirkin" , Nicolin Chen , Shameerali Kolothum Thodi , "Liu, Yi L" , Keqian Zhu , Sean Mooney Subject: Re: [PATCH RFC 04/12] kernel/user: Allow user::locked_vm to be usable for iommufd Message-ID: <20220329114611.GC1716663@nvidia.com> References: <20220324114605.GX11336@nvidia.com> <20220328122239.GL1342626@nvidia.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: MN2PR11CA0022.namprd11.prod.outlook.com (2603:10b6:208:23b::27) 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: 10f36012-7081-4276-68ef-08da1179b975 X-MS-TrafficTypeDiagnostic: SN6PR12MB2704: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)(508600001)(86362001)(66476007)(66946007)(2906002)(8676002)(33656002)(4326008)(6506007)(7416002)(66556008)(4744005)(8936002)(26005)(316002)(54906003)(5660300002)(186003)(1076003)(36756003)(6916009)(38100700002)(2616005)(83380400001)(6486002)(6512007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?+8BmzVfWzBBPLG3BRsvhMJtbIYkplBRO60duLOxPQqWuPLOYB9CsAAB7C8Pc?= =?us-ascii?Q?O6cqGcrWP604dnvpdCk3l1McFpXqxZI0XMj/S82xjh3ePRIbJw1YrxKlCsOp?= =?us-ascii?Q?aI7UKucLarz5+RfJfWzhzHHhlcHgvw/EXAT5EUR5afOKHSz1s1FACCbZ/NTj?= =?us-ascii?Q?HtlfxFzXZ4/OiS9rBIrQxlqcuoKf3gUnlIaHL26IBximz4V8w5zf3Y6q7L7n?= =?us-ascii?Q?tMDb2w8p3g4683AAemqeBDjXaZNeHHtOTImzTz85mCDhU/K8NpC0k+UzmSMA?= =?us-ascii?Q?ukyLVwiLTN78B3ROy7DbGK7PX9J++IaD4mTRHybnpS1ksP/IgQxikTo0Wh4A?= =?us-ascii?Q?hHJWCQ2Y5hBhgvq7lqYDngD4i1g1pz37tgRYQVH1VRp77MaCkFh7CUsSFlo2?= =?us-ascii?Q?7Mc+2mEFvzt5iV7I+iyaxdcztANHHw1tvYBlDs+N1D0zWAVhrgE6Ymd+Zce4?= =?us-ascii?Q?WB3/aRkM0oOnsKQaOxk6znbGhhgt6U/unLF5Ke8qt/opI9VEIMzUf7oHjLY8?= =?us-ascii?Q?LXwpNZAXWTvPjB4NcGhb72TfNuYU1tPrPzgYOuUG7Vw9+EQriuzbh5QDCgFL?= =?us-ascii?Q?trGACCP4aGj4YaWq37NQOPXswkwuqYlE59Ws/8bLL1IKPmXptysaBdYerWrq?= =?us-ascii?Q?Zx4VVbo7oto59qVhVsQl64228Jl8Jg6sKak6jDm27xIQj+XlDrEdzro1CpoC?= =?us-ascii?Q?1PzCSGBP2k5BAhAJ04ruy7pixjTlOvqU3wJ1xGB7+/E0xaOqWfZ+n7T+wkIF?= =?us-ascii?Q?j75eS0OLKyXTZcs5LwfbjhLk4+A7U1iYbEzlAyyRRwv54nlv6jcp4ixUb2Ak?= =?us-ascii?Q?KXDyTJggkTUc49wgXJaMTVbG/9dWH37I2QStYAoYI/xbGkuXQv3Xw6dW2lKg?= =?us-ascii?Q?qG7NPvOGTC4I2a+iuDf9Iw0otoAiHwLlb6YvecUy0og6m6ILk0XZNB5ZuQD8?= =?us-ascii?Q?x3xCI9brREmWq7Dp9+0PkJm91fVZaYLTozfiDBz9HNKPWHu6Z5LSNoD9Xvak?= =?us-ascii?Q?zi6q72+rp06H7w/jmgOLe2moA+Q91IowqJ9tTbSL874Hrq0KLeSNulEqNn04?= =?us-ascii?Q?LHXre0QQvjVgqhOD4EZKBi1hVYldIgu/BdITGo8b0N/hshOG1UiXDaU2sOmE?= =?us-ascii?Q?Ui2FOUKHJV1L5qfq0ulJB2LVCgONCOIxb/igK91FiqxblmROjoHMlDk0KvzH?= =?us-ascii?Q?VFzszc9wQUn+3YxDT6QrFtro5hBw7xVyPOzR6sr8OYwOtH5Y3EPhagDDoxlN?= =?us-ascii?Q?8LcrIXBXVQw5azK5xGifqbEW5TWTCp4ZdG8vOFU6G+5FldeN2NfhSB2mugpV?= =?us-ascii?Q?CXcvK2Z19WtVTx6IdfoELHgpCVFfn7ybAmnJslqPc2eUjC9Kxgum2taMmLPz?= =?us-ascii?Q?1DbhvRIsDgf66Wx2TIH3m9Mv/8ffsMYhg3iT0VPPoRGDsr6N4j58klzjQQGG?= =?us-ascii?Q?AoHkrfI8jUOcn/mqMU2PkO4ke9XGTpMmGIdu5mzIpl7C0yGg2VhOvDsbUss7?= =?us-ascii?Q?PhhsdHgHjzsdNZxW61lZynFbsWo6a1Z/P9xmLP9/1kHNiCgdfbzLjy066Rxo?= =?us-ascii?Q?hUIoceU943OtSqVR+RbG6l05QhGbdKtNv6QqhGlVlbMSDBOg0ynXvGQVMISP?= =?us-ascii?Q?RT2zpNUuxXBpeVhu/WC7Ls5yQJ6HV2hgCnKImupVnDk5pIIiqzeNgbi908Z2?= =?us-ascii?Q?3k9nWS9ND/0npweShhDjlUL1C6Q3r9I6IE+i8D44TTUBK19JcThCWPpt8c85?= =?us-ascii?Q?WwsDLIhMKA=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 10f36012-7081-4276-68ef-08da1179b975 X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB4192.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Mar 2022 11:46:12.8728 (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: unPdhkDJKfFrPiHeVK1D0wkcpJFE4h0IpzW0oAaxo3yyYALdy1qrziMjYG+J+ULj X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR12MB2704 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Tue, Mar 29, 2022 at 12:59:52PM +0800, Jason Wang wrote: > vDPA has a backend feature negotiation, then actually, userspace can > tell vDPA to go with the new accounting approach. Not sure RDMA can do > the same. A security feature userspace can ask to turn off is not really a security feature. Jason