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Mon, 21 Apr 2025 08:38:29 -0700 Received: from Asurada-Nvidia (10.127.8.12) by mail.nvidia.com (10.126.190.180) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14 via Frontend Transport; Mon, 21 Apr 2025 08:38:28 -0700 Date: Mon, 21 Apr 2025 08:38:26 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: "jgg@nvidia.com" , "corbet@lwn.net" , "will@kernel.org" , "robin.murphy@arm.com" , "joro@8bytes.org" , "thierry.reding@gmail.com" , "vdumpa@nvidia.com" , "jonathanh@nvidia.com" , "shuah@kernel.org" , "praan@google.com" , "nathan@kernel.org" , "peterz@infradead.org" , "Liu, Yi L" , "jsnitsel@redhat.com" , "mshavit@google.com" , "zhangzekun11@huawei.com" , "iommu@lists.linux.dev" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-tegra@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , "patches@lists.linux.dev" Subject: Re: [PATCH v1 08/16] iommufd/viommu: Introduce IOMMUFD_OBJ_VCMDQ and its related struct Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Apr 2025 15:38:48.0617 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 18da25bc-a5e5-4529-8f15-08dd80ea9bd6 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015CA.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB8336 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250421_083854_382014_F471F09C X-CRM114-Status: GOOD ( 13.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Apr 21, 2025 at 08:03:01AM +0000, Tian, Kevin wrote: > > From: Nicolin Chen > > Sent: Friday, April 11, 2025 2:38 PM > > > > Add a new IOMMUFD_OBJ_VCMDQ with an iommufd_vcmdq structure, > > representing > > a command queue type of physical HW passed to or shared with a user > > space > > VM. > > what is the implication of "or shared with"? Do you intend to support > an usage in which a CMDQ is coordinated by both guest and host (which > sounds insane)? No. It should have been removed. Was for "vQUEUE" previously for a potential wider use case. Will fix this. Thanks Nicolin