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Thu, 30 Jun 2022 15:45:31 +0000 Received: from drhqmail203.nvidia.com (10.126.190.182) by drhqmail203.nvidia.com (10.126.190.182) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.26; Thu, 30 Jun 2022 08:45:31 -0700 Received: from Asurada-Nvidia (10.127.8.11) by mail.nvidia.com (10.126.190.182) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.26 via Frontend Transport; Thu, 30 Jun 2022 08:45:30 -0700 Date: Thu, 30 Jun 2022 08:45:29 -0700 From: Nicolin Chen To: Yong Wu CC: "Tian, Kevin" , Jason Gunthorpe , Baolu Lu , "linux-s390@vger.kernel.org" , "cohuck@redhat.com" , "jordan@cosmicpenguin.net" , "linux-tegra@vger.kernel.org" , "thierry.reding@gmail.com" , "will@kernel.org" , "alyssa@rosenzweig.io" , "jean-philippe@linaro.org" , "kvm@vger.kernel.org" , "zhang.lyra@gmail.com" , "iommu@lists.linux-foundation.org" , "jonathanh@nvidia.com" , "yangyingliang@huawei.com" , "orsonzhai@gmail.com" , "gerald.schaefer@linux.ibm.com" , "linux-arm-msm@vger.kernel.org" , "alex.williamson@redhat.com" , "christophe.jaillet@wanadoo.fr" , "matthias.bgg@gmail.com" , "tglx@linutronix.de" , "virtualization@lists.linux-foundation.org" , "linux-arm-kernel@lists.infradead.org" , "dwmw2@infradead.org" , "marcan@marcan.st" , "linux-kernel@vger.kernel.org" , "baolin.wang7@gmail.com" , "linux-mediatek@lists.infradead.org" , "robin.murphy@arm.com" Subject: Re: [PATCH v3 1/5] iommu: Return -EMEDIUMTYPE for incompatible domain and device/group Message-ID: References: <20220623200029.26007-1-nicolinc@nvidia.com> <20220623200029.26007-2-nicolinc@nvidia.com> <270eec00-8aee-2288-4069-d604e6da2925@linux.intel.com> <8a5e9c81ab1487154828af3ca21e62e39bcce18c.camel@mediatek.com> <19cfb1b85a347c70c6b0937bbbca4a176a724454.camel@mediatek.com> <20220624181943.GV4147@nvidia.com> <63969062a55b1c520f276b9a4b5f79faa12da20b.camel@mediatek.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <63969062a55b1c520f276b9a4b5f79faa12da20b.camel@mediatek.com> X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: c416e8ca-8cec-4914-84e6-08da5aaf9130 X-MS-TrafficTypeDiagnostic: BL1PR12MB5875:EE_ 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 Thu, Jun 30, 2022 at 05:33:16PM +0800, Yong Wu wrote: > External email: Use caution opening links or attachments > > > On Wed, 2022-06-29 at 12:47 -0700, Nicolin Chen wrote: > > On Fri, Jun 24, 2022 at 03:19:43PM -0300, Jason Gunthorpe wrote: > > > On Fri, Jun 24, 2022 at 06:35:49PM +0800, Yong Wu wrote: > > > > > > > > > It's not used in VFIO context. "return 0" just satisfy the > > > > > > iommu > > > > > > framework to go ahead. and yes, here we only allow the shared > > > > > > "mapping-domain" (All the devices share a domain created > > > > > > internally). > > > > > > What part of the iommu framework is trying to attach a domain and > > > wants to see success when the domain was not actually attached ? > > > > > > > > What prevent this driver from being used in VFIO context? > > > > > > > > Nothing prevent this. Just I didn't test. > > > > > > This is why it is wrong to return success here. > > > > Hi Yong, would you or someone you know be able to confirm whether > > this "return 0" is still a must or not? > > > > Considering that it's an old 32-bit platform for MTK, if it would > > take time to do so, I'd like to drop the change in MTK driver and > > note in commit log for you or other MTK folks to change in future. > > Yes. Please help drop the change in this file. > > Sorry I don't have the board at hand right now and I could not list the > backtrace where this is needed(should be bus_iommu_probe from the > previous debug...) OK. Thanks for the reply. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel