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Tue, 5 Dec 2023 07:38:20 +0000 Date: Tue, 5 Dec 2023 15:09:17 +0800 From: Yan Zhao To: Jason Gunthorpe CC: , , , , , , , , , , , , Subject: Re: [RFC PATCH 14/42] iommufd: Enable KVM HW page table object to be proxy between KVM and IOMMU Message-ID: Reply-To: Yan Zhao References: <20231202091211.13376-1-yan.y.zhao@intel.com> <20231202092216.14278-1-yan.y.zhao@intel.com> <20231204183410.GM1493156@nvidia.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20231204183410.GM1493156@nvidia.com> X-ClientProxiedBy: SI1PR02CA0060.apcprd02.prod.outlook.com (2603:1096:4:1f5::17) To DS7PR11MB5966.namprd11.prod.outlook.com (2603:10b6:8:71::6) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR11MB5966:EE_|DM6PR11MB4514:EE_ X-MS-Office365-Filtering-Correlation-Id: 74137d21-beed-4ab7-f860-08dbf56526ff 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:DS7PR11MB5966.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(39860400002)(346002)(376002)(396003)(136003)(366004)(230922051799003)(186009)(64100799003)(1800799012)(451199024)(3450700001)(7416002)(4744005)(2906002)(316002)(66556008)(6916009)(54906003)(66476007)(86362001)(66946007)(8676002)(41300700001)(4326008)(8936002)(5660300002)(38100700002)(82960400001)(6486002)(83380400001)(478600001)(26005)(6666004)(6512007)(6506007);DIR:OUT;SFP:1102; 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Mon, 04 Dec 2023 23:38:45 -0800 (PST) On Mon, Dec 04, 2023 at 02:34:10PM -0400, Jason Gunthorpe wrote: > On Sat, Dec 02, 2023 at 05:22:16PM +0800, Yan Zhao wrote: > > +config IOMMUFD_KVM_HWPT > > + bool "Supports KVM managed HW page tables" > > + default n > > + help > > + Selecting this option will allow IOMMUFD to create IOMMU stage 2 > > + page tables whose paging structure and mappings are managed by > > + KVM MMU. IOMMUFD serves as proxy between KVM and IOMMU driver to > > + allow IOMMU driver to get paging structure meta data and cache > > + invalidate notifications from KVM. > > I'm not sure we need a user selectable kconfig for this.. > > Just turn it on if we have kvm turned on an iommu driver implements it > Got it, thanks!