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Thu, 24 Apr 2025 08:54:15 -0700 Date: Thu, 24 Apr 2025 08:54:13 -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 00/16] iommufd: Add vIOMMU infrastructure (Part-4 vCMDQ) Message-ID: References: Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB4A:EE_|DS0PR12MB7996:EE_ X-MS-Office365-Filtering-Correlation-Id: d22c8039-7c04-41d9-e96f-08dd83484ca0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|1800799024|82310400026|376014|7416014; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Apr 2025 15:54:30.0944 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d22c8039-7c04-41d9-e96f-08dd83484ca0 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: BL6PEPF0001AB4A.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7996 On Thu, Apr 24, 2025 at 08:21:08AM +0000, Tian, Kevin wrote: > > From: Nicolin Chen > > Sent: Friday, April 11, 2025 2:38 PM > > > [...] > > This is a big > > improvement since there is no VM Exit during an invalidation, compared to > > the traditional invalidation pathway by trapping a guest-own invalidation > > queue and forwarding those commands/requests to the host kernel that will > > eventually fill a HW-owned queue to execute those commands. > > > > any data to show how big the improvements could be in major > IOMMU usages (kernel dma, user dma and sva)? I thought I mentioned about the percentage of the gain somewhere but seemingly not in this series.. Will add. Thanks! Nicolin