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Thu, 17 Oct 2024 10:40:57 -0700 Date: Thu, 17 Oct 2024 10:40:56 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v3 05/11] iommu: Pass in a viommu pointer to domain_alloc_user op Message-ID: References: <781b5bddb195bffa2ba80e5a04cb10336db74c03.1728491453.git.nicolinc@nvidia.com> <20241017165151.GH3559746@nvidia.com> <20241017173855.GO3559746@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20241017173855.GO3559746@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH1PEPF0000AD74:EE_|BY5PR12MB4034:EE_ X-MS-Office365-Filtering-Correlation-Id: 20aa9eeb-367a-4093-9528-08dceed2e73c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|36860700013|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?1f+JOdep8DCewiOtcDkHFXye7wzV+MZov9dY1q5xhcE51mLNXSxGupLMH9IG?= =?us-ascii?Q?ajL4eyq1wnG3zmqRXTBy1FQ+OzarRmT+sAUvEFv5JznXBQbY71hZTG9o9NZB?= =?us-ascii?Q?DZSXA+aWJG5uuf0DGGqi9ecimabm9HDAIqYQ9mZMkXUStF3mEyYbugd7InDa?= =?us-ascii?Q?OpSC3kwrIdiHiKHEIzmhV2wdKkpC5gGa92xaH4Q3rya75Hja1V7beisnTlHK?= =?us-ascii?Q?wh8SyiMq9d2dhBHsJBoBQI90F7nQT23JTpmF8RBSDny7U7HbmsP+FxZXuRMH?= =?us-ascii?Q?wtmb4wWwzhJ4o7x08QVl/SnHwDoDUWLETXaL4WIG2ePRQM/KM8WFrLBIZrAN?= =?us-ascii?Q?OAHA+1THi1XEKC/hMB+0WI0Cnph64dNSZHo4/k90jCACz8CGYTVVo7snGjTV?= =?us-ascii?Q?4SmgOzB193Xmyp8o4xpZXfzYydaXReVD8imXzykABwAWh3rwnOHCmJK+lDCq?= =?us-ascii?Q?SIyqFA2lIDOf63iF2VkVUvBPjmWTnyKtv2qRwo23nzirafQkx8SpQZhpAAQX?= =?us-ascii?Q?6LzSLVMnVSBc9mg93OiFFGWUYfhKGis1vch138rnFzarbMhk2u+A+eXPgy6+?= =?us-ascii?Q?mc7hb+nSh2LCh59F8xFKbTIKlBOGsVIahJLjJ6eKwiRLRcY6PqpbY3AmBDVG?= =?us-ascii?Q?0f9C7f8bsWM2m8midCrPNbaBJyEDfe+qSGbGmPOgRKH7fv+Hcp4aMk9NOu1x?= =?us-ascii?Q?1Zu1JbkTnPM/gB2/oQBuM78NN00UBbG42hfHMvX8UqCJ1KDe39EXZHLHk6oz?= =?us-ascii?Q?jBmE5l6FJHmxvU/gkPArp/IhsMNnYx85UIe60e6tUxkMaWvD5QQUmyqxkUut?= =?us-ascii?Q?VVThhcmz6s51UHsyXQURB+NJqwBIXrJE/o+fqk72nZlqbOemzDBU6AWT5Rqq?= =?us-ascii?Q?zx4Si01BruTIowEJFcGKlej5XODFT2t4325ptCGrgRGsRoAbr7nSKdHGw+eK?= =?us-ascii?Q?rD1+jmJayR1rrA8AN3KaLiqKLtZXgKC3fRKN5nTUCaAAq/fFmpUyCtdxX+jg?= =?us-ascii?Q?RbemZHaiYPxEzmgbSvaI/Ik5IswNvfBloMQTefAao1awlbwtOoI8MqoYA/AS?= =?us-ascii?Q?2QhAdWfuZjmhAGpqO9/oVQqUGSrs6JZjEKVReUQua9Ye2D7iWz/Yxt41Wutz?= =?us-ascii?Q?00Xrzwu/jGQxbkWUp9TYpuN5RJMtkAPjk2W+1V3Exk7GUaqjvv00nqWyCrB4?= =?us-ascii?Q?rZeeCOx9Cc8P/6nYZ5Wcvhg0hOay9qiVEEOifmurqmIFiuC2rgukQj36EFX0?= =?us-ascii?Q?wIrRhCUlnWnrhXC1gY9CO9UUNALK/PiAc+7NOPrck31z+FW+19UXqisq1IV7?= =?us-ascii?Q?FhCqgjZ4XZySszRJHvpli7LwaOzQCufy25v8QcuCAxo3s3jP2vy/uQ7S18q+?= =?us-ascii?Q?M2RLUKDO3hKIX6G+/cjFNF0FDul7VJ7us7x4uv8X/clCeZhhsg=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(376014)(7416014)(36860700013)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Oct 2024 17:41:16.8099 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 20aa9eeb-367a-4093-9528-08dceed2e73c X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH1PEPF0000AD74.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4034 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241017_104125_501783_2AF9ABC1 X-CRM114-Status: GOOD ( 21.27 ) 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 Thu, Oct 17, 2024 at 02:38:55PM -0300, Jason Gunthorpe wrote: > On Thu, Oct 17, 2024 at 10:21:31AM -0700, Nicolin Chen wrote: > > On Thu, Oct 17, 2024 at 01:51:51PM -0300, Jason Gunthorpe wrote: > > > On Wed, Oct 09, 2024 at 09:38:05AM -0700, Nicolin Chen wrote: > > > > With a viommu object wrapping a potentially shareable S2 domain, a nested > > > > domain should be allocated by associating to a viommu instead. > > > > > > > > For drivers without a viommu support, keep the parent domain input, which > > > > should be just viommu->hwpt->common.domain otherwise. > > > > > > > > Signed-off-by: Nicolin Chen > > > > --- > > > > include/linux/iommu.h | 1 + > > > > drivers/iommu/amd/iommu.c | 1 + > > > > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 1 + > > > > drivers/iommu/intel/iommu.c | 1 + > > > > drivers/iommu/iommufd/hw_pagetable.c | 5 +++-- > > > > drivers/iommu/iommufd/selftest.c | 1 + > > > > 6 files changed, 8 insertions(+), 2 deletions(-) > > > > > > > > diff --git a/include/linux/iommu.h b/include/linux/iommu.h > > > > index 3a50f57b0861..9105478bdbcd 100644 > > > > --- a/include/linux/iommu.h > > > > +++ b/include/linux/iommu.h > > > > @@ -573,6 +573,7 @@ struct iommu_ops { > > > > struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); > > > > struct iommu_domain *(*domain_alloc_user)( > > > > struct device *dev, u32 flags, struct iommu_domain *parent, > > > > + struct iommufd_viommu *viommu, > > > > const struct iommu_user_data *user_data); > > > > > > This re-enforces my feeling we should have made a > > > domain_alloc_nested().. > > > > That could make these changes slightly cleaner. Maybe adding a > > small series prior to your initial nesting, and get it merged > > quickly? > > Maybe we should put an op on the viommu_ops to allocate a nested > domain? > > It make some sense and resolves my worries about checking for > driver ownership. Yea, that sounds a smart move to me! Will give it a try. Nicolin