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Thu, 6 Feb 2025 18:22:04 +0000 Received: from CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732]) by CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732%6]) with mapi id 15.20.8398.025; Thu, 6 Feb 2025 18:22:02 +0000 Date: Thu, 6 Feb 2025 14:22:01 -0400 From: Jason Gunthorpe To: Shameerali Kolothum Thodi Cc: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= , "qemu-arm@nongnu.org" , "qemu-devel@nongnu.org" , "eric.auger@redhat.com" , "peter.maydell@linaro.org" , "nicolinc@nvidia.com" , "ddutile@redhat.com" , Linuxarm , "Wangzhou (B)" , jiangkunkun , Jonathan Cameron , "zhangfei.gao@linaro.org" , "nathanc@nvidia.com" Subject: Re: [RFC PATCH 0/5] hw/arm/virt: Add support for user-creatable nested SMMUv3 Message-ID: <20250206182201.GL2960738@nvidia.com> References: <71116749d1234ab48a205fd2588151ec@huawei.com> <20250206170238.GG2960738@nvidia.com> <20250206174647.GA3480821@nvidia.com> <20250206175843.GI2960738@nvidia.com> <13b1d8b97a314cb28b87563fa9b45299@huawei.com> <20250206181306.GK2960738@nvidia.com> <02a0080a4a1642d69b7f5dd4707a5b3d@huawei.com> Content-Type: text/plain; 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envelope-from=jgg@nvidia.com; helo=NAM10-BN7-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, Feb 06, 2025 at 06:18:14PM +0000, Shameerali Kolothum Thodi wrote: > > So even if you invent an iommu ID we cannot accept it as a handle to > > create viommu in iommufd. > > Creating the vIOMMU only happens when the user does a cold/hot plug of > a VFIO device. At that time Qemu checks whether the assigned id matches > with whatever the kernel tell it. This is not hard up until the guest is started. If you boot a guest without a backing viommu iommufd object then there will be some more complexities. Jason