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Received: from MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) by DS7PR12MB5743.namprd12.prod.outlook.com (2603:10b6:8:72::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5353.18; Mon, 20 Jun 2022 04:03:20 +0000 Received: from MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::ac35:7c4b:3282:abfb]) by MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::ac35:7c4b:3282:abfb%3]) with mapi id 15.20.5353.022; Mon, 20 Jun 2022 04:03:20 +0000 Date: Mon, 20 Jun 2022 01:03:17 -0300 From: Jason Gunthorpe To: Nicolin Chen Cc: "robin.murphy@arm.com" , "Tian, Kevin" , "joro@8bytes.org" , "will@kernel.org" , "marcan@marcan.st" , "sven@svenpeter.dev" , "robdclark@gmail.com" , "baolu.lu@linux.intel.com" , "matthias.bgg@gmail.com" , "orsonzhai@gmail.com" , "baolin.wang7@gmail.com" , "zhang.lyra@gmail.com" , "jean-philippe@linaro.org" , "alex.williamson@redhat.com" , "jordan@cosmicpenguin.net" , "thierry.reding@gmail.com" , "alyssa@rosenzweig.io" , "linux-s390@vger.kernel.org" , "saiprakash.ranjan@codeaurora.org" , "kvm@vger.kernel.org" , "jonathanh@nvidia.com" , "linux-arm-kernel@lists.infradead.org" , "yangyingliang@huawei.com" , "gerald.schaefer@linux.ibm.com" , "linux-arm-msm@vger.kernel.org" , "christophe.jaillet@wanadoo.fr" , "linux-tegra@vger.kernel.org" , "tglx@linutronix.de" , "virtualization@lists.linux-foundation.org" , "isaacm@codeaurora.org" , "cohuck@redhat.com" , "linux-kernel@vger.kernel.org" , "iommu@lists.linux-foundation.org" , "linux-mediatek@lists.infradead.org" , "dwmw2@infradead.org" Subject: Re: [PATCH v2 5/5] vfio/iommu_type1: Simplify group attachment Message-ID: <20220620040317.GD5219@nvidia.com> References: <20220616000304.23890-1-nicolinc@nvidia.com> <20220616000304.23890-6-nicolinc@nvidia.com> Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: MW2PR2101CA0018.namprd21.prod.outlook.com (2603:10b6:302:1::31) To MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 2ffc12fa-3882-4ffd-dd09-08da5271cfd2 X-MS-TrafficTypeDiagnostic: DS7PR12MB5743:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jun 17, 2022 at 04:07:20PM -0700, Nicolin Chen wrote: > > > > > + vfio_iommu_aper_expand(iommu, &iova_copy); > > > > > > > > but now it's done for every group detach. The aperture is decided > > > > by domain geometry which is not affected by attached groups. > > > > > > Yea, I've noticed this part. Actually Jason did this change for > > > simplicity, and I think it'd be safe to do so? > > > > Perhaps detach_destroy() can return a Boolean to indicate whether > > a domain is destroyed. > > It could be a solution but doesn't feel that common for a clean > function to have a return value indicating a special case. Maybe > passing in "&domain" so that we can check if it's NULL after? It is harmless to do every time, it just burns a few CPU cycles on a slow path. We don't need complexity to optmize it. Jason _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel