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Fri, 18 Jun 2021 15:15:08 +0000 Received: from BL0PR12MB5506.namprd12.prod.outlook.com ([fe80::3d51:a3b9:8611:684e]) by BL0PR12MB5506.namprd12.prod.outlook.com ([fe80::3d51:a3b9:8611:684e%8]) with mapi id 15.20.4242.021; Fri, 18 Jun 2021 15:15:08 +0000 Date: Fri, 18 Jun 2021 12:15:06 -0300 From: Jason Gunthorpe To: Joerg Roedel Cc: "Tian, Kevin" , Alex Williamson , Jean-Philippe Brucker , David Gibson , Jason Wang , "parav@mellanox.com" , "Enrico Weigelt, metux IT consult" , Paolo Bonzini , Shenming Lu , Eric Auger , Jonathan Corbet , "Raj, Ashok" , "Liu, Yi L" , "Wu, Hao" , "Jiang, Dave" , Jacob Pan , Kirti Wankhede , Robin Murphy , "kvm@vger.kernel.org" , "iommu@lists.linux-foundation.org" , David Woodhouse , LKML , Lu Baolu Subject: Re: Plan for /dev/ioasid RFC v2 Message-ID: <20210618151506.GG1002214@nvidia.com> References: <20210612012846.GC1002214@nvidia.com> <20210612105711.7ac68c83.alex.williamson@redhat.com> <20210614140711.GI1002214@nvidia.com> <20210614102814.43ada8df.alex.williamson@redhat.com> <20210615101215.4ba67c86.alex.williamson@redhat.com> <20210616133937.59050e1a.alex.williamson@redhat.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?MHPEVTsMe8iXifQqvM4ODoFdc2NzcS5zgzeJZ7GV3AktPajS+gjb8RfT7afZ?= =?us-ascii?Q?UWYur0sNlZu54J7UPDmitvGY6zHVyWOX6H+WlRqHAOgO+ydBO+aYti6ianEQ?= =?us-ascii?Q?guBBjPu+tdtv9IlLqaP1bktY6ZV+lvcPnbZVYA8VvRbJvfAZLxiyLQARlARD?= =?us-ascii?Q?Ok4s3Pm7Cm+HTBmmM/E50KPbfma0UnKlHHy3sG36leFohdst3PRRg0S84OD/?= =?us-ascii?Q?ZWyl/+rOXE8swZfCJap2IqeYK+ywyVAsIsCIMbZaMJKmgcO/ST2Sq8yuEkSw?= =?us-ascii?Q?lrFAA+1pFlkKqv6FHa3rpeZVLa8Iqxh35ch3jpnDNXA1IXmLvqG6ugo0C0FU?= =?us-ascii?Q?OHW3FdvYAkM7DO6AjqXp6cqG4Kkg+8U+kT92/vxNLRkBG4dfIGWgxK/rKlnO?= =?us-ascii?Q?0j/UH7iSy+joA+T3V3VDPBySvWTBZJRTb1S7cFqlf/T6WI0Zb378Y2yc22o8?= =?us-ascii?Q?wDTlqlk5H2/hNPgSe7x43H1AZdyVaTuLcxQpukJZuej41GvDHX4B2oZgPvMu?= =?us-ascii?Q?/1ed3QEgVd4Fc6WH4nKaEAMmEKjgV3RluHK/aLI5hV4aFW6EDqcs6N0w8F2D?= =?us-ascii?Q?7Y1PbCcF8WaviPHMu/x9kspLu52EcVAJxnW2eTf6FZIi3+oLvrXTlQjy7Nqp?= =?us-ascii?Q?L5r7QZTT84c4RDSo30nLsWq3xKPIe5oui/SYhp4yZM2WzHWIV/8OTBuGW+g+?= =?us-ascii?Q?A+zwDtcx79M+KTDzgeqTTwxHYhmgmzWN8ZQQuNSh/y03FS2ySErXz/Hkatyd?= =?us-ascii?Q?nOkZD2uEp5OKQhUNbiP6E2fDhVahbJKVhH02u98zCz7ylGQRa3JyZYT6VvZS?= =?us-ascii?Q?G9Obpb/Csa9Ac+lQEFk1liAmDlRS7GitJL7eVIHE4/27Y8OWTLY9RewIX3Ra?= =?us-ascii?Q?je3XjnQr1VOHhPHcNf9qc3jLYDnll58Ap/Vcisl5RTjDz4THVvdDAaiA3pez?= =?us-ascii?Q?c+/Cw2Je/yaBPwLBm1Bv+FaG/fdlow33WhaaNZHIzhN8bmBZzDquYALMS6XP?= =?us-ascii?Q?P6lHxH5t1/c7x0uKu86aKT+hEesczte1v5/3Yy55LN/eTz+newfdZSonH/Oa?= =?us-ascii?Q?ATCK3+UHbCTt3mb6npr/jZXr7xQcQFct/jHfjtnRyKH4ompgkFJEN9d9tv2A?= =?us-ascii?Q?2Dqvn/hwsRW5990IaOKvsXR6d5b4dFMDeaulA+3gWhEmUNs2EaIIonL/psGr?= =?us-ascii?Q?EZhSYGLNmyOTco9/843UeERM//yEavecx7qJ/ujSiWAj4LUSB1IW/TbnX4EQ?= =?us-ascii?Q?d09rqmre26Wh58exKg2ha7MS8HJ6VjlWkvHVshYGOWtVM3+Qcbl+mz+IrUDj?= =?us-ascii?Q?gobCvSjyqdsDzXdkbHLxN4b1?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: b7926c17-48ae-4305-13d8-08d9326bdb96 X-MS-Exchange-CrossTenant-AuthSource: BL0PR12MB5506.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jun 2021 15:15:08.0473 (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: znsTRUs8LM6dvU6dxOAq6JtM/vfvtSMdbFx3C1dLkwU1yqfsW9bRncDTT7LkgOkh X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5159 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 18, 2021 at 03:47:51PM +0200, Joerg Roedel wrote: > Hi Kevin, > > On Thu, Jun 17, 2021 at 07:31:03AM +0000, Tian, Kevin wrote: > > Now let's talk about the new IOMMU behavior: > > > > - A device is blocked from doing DMA to any resource outside of > > its group when it's probed by the IOMMU driver. This could be a > > special state w/o attaching to any domain, or a new special domain > > type which differentiates it from existing domain types (identity, > > dma, or unmanged). Actually existing code already includes a > > IOMMU_DOMAIN_BLOCKED type but nobody uses it. > > There is a reason for the default domain to exist: Devices which require > RMRR mappings to be present. You can't just block all DMA from devices > until a driver takes over, we put much effort into making sure there is > not even a small window in time where RMRR regions (unity mapped regions > on AMD) are not mapped. Yes, I think the DMA blocking can only start around/after a VFIO type driver has probed() and bound to a device in the group, not much different from today. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Fri, Jun 18, 2021 at 03:47:51PM +0200, Joerg Roedel wrote: > Hi Kevin, > > On Thu, Jun 17, 2021 at 07:31:03AM +0000, Tian, Kevin wrote: > > Now let's talk about the new IOMMU behavior: > > > > - A device is blocked from doing DMA to any resource outside of > > its group when it's probed by the IOMMU driver. This could be a > > special state w/o attaching to any domain, or a new special domain > > type which differentiates it from existing domain types (identity, > > dma, or unmanged). Actually existing code already includes a > > IOMMU_DOMAIN_BLOCKED type but nobody uses it. > > There is a reason for the default domain to exist: Devices which require > RMRR mappings to be present. You can't just block all DMA from devices > until a driver takes over, we put much effort into making sure there is > not even a small window in time where RMRR regions (unity mapped regions > on AMD) are not mapped. Yes, I think the DMA blocking can only start around/after a VFIO type driver has probed() and bound to a device in the group, not much different from today. Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu