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Wed, 6 Nov 2024 09:10:08 +0000 Message-ID: <982f10e2-5fc7-4b13-9877-77042ce20a11@intel.com> Date: Wed, 6 Nov 2024 17:14:44 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 11/13] iommu/vt-d: Add set_dev_pasid callback for nested domain To: Baolu Lu , "Tian, Kevin" , "joro@8bytes.org" , "jgg@nvidia.com" CC: "alex.williamson@redhat.com" , "eric.auger@redhat.com" , "nicolinc@nvidia.com" , "kvm@vger.kernel.org" , "chao.p.peng@linux.intel.com" , "iommu@lists.linux.dev" , "Duan, Zhenzhong" , "vasant.hegde@amd.com" , "will@kernel.org" References: <20241104131842.13303-1-yi.l.liu@intel.com> <20241104131842.13303-12-yi.l.liu@intel.com> <778d4e7b-cb4f-48d6-9b5d-de5e18c1a367@linux.intel.com> Content-Language: en-US From: Yi Liu In-Reply-To: <778d4e7b-cb4f-48d6-9b5d-de5e18c1a367@linux.intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SI2PR01CA0030.apcprd01.prod.exchangelabs.com (2603:1096:4:192::15) To DS0PR11MB7529.namprd11.prod.outlook.com (2603:10b6:8:141::20) Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7529:EE_|CH0PR11MB8142:EE_ X-MS-Office365-Filtering-Correlation-Id: b96907cc-0978-4c97-6a24-08dcfe42cf22 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014; 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>>> +    if (IS_ERR(dev_pasid)) >>> +        return PTR_ERR(dev_pasid); >>> + >>> +    ret = domain_setup_nested(iommu, dmar_domain, dev, pasid, old); >>> +    if (ret) >>> +        goto out_remove_dev_pasid; >>> + >>> +    domain_remove_dev_pasid(old, dev, pasid); >>> + >> >> forgot one thing. Why not required to create a debugfs entry for >> nested dev_pasid? > > This debugfs node is only created for paging domain. I think Kevin got one point. The debugfs is added when paging domain is attached. How about the paging domains that is only used as nested parent domain. We seem to lack a debugfs node for such paging domains. -- Regards, Yi Liu