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Wed, 11 Sep 2024 00:20:42 -0700 Date: Wed, 11 Sep 2024 00:20:39 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: Jason Gunthorpe , "will@kernel.org" , "joro@8bytes.org" , "suravee.suthikulpanit@amd.com" , "robin.murphy@arm.com" , "dwmw2@infradead.org" , "baolu.lu@linux.intel.com" , "shuah@kernel.org" , "linux-kernel@vger.kernel.org" , "iommu@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-kselftest@vger.kernel.org" , "eric.auger@redhat.com" , "jean-philippe@linaro.org" , "mdf@kernel.org" , "mshavit@google.com" , "shameerali.kolothum.thodi@huawei.com" , "smostafa@google.com" , "Liu, Yi L" Subject: Re: [PATCH v2 17/19] iommu/arm-smmu-v3: Add arm_smmu_viommu_cache_invalidate Message-ID: References: <4b61aba3bc6c1cce628d9db44d5b18ea567a8be1.1724776335.git.nicolinc@nvidia.com> <20240905162039.GT1358970@nvidia.com> <20240905182148.GA1358970@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00001CE3:EE_|SA0PR12MB7463:EE_ X-MS-Office365-Filtering-Correlation-Id: 62b299f7-3f38-458c-1947-08dcd23249f2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|82310400026|36860700013|7416014; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Sep 2024 07:21:01.0257 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 62b299f7-3f38-458c-1947-08dcd23249f2 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CE3.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB7463 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240911_002109_598444_90689EF7 X-CRM114-Status: GOOD ( 29.34 ) 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 Wed, Sep 11, 2024 at 06:25:16AM +0000, Tian, Kevin wrote: > > From: Jason Gunthorpe > > Sent: Friday, September 6, 2024 2:22 AM > > > > On Thu, Sep 05, 2024 at 11:00:49AM -0700, Nicolin Chen wrote: > > > On Thu, Sep 05, 2024 at 01:20:39PM -0300, Jason Gunthorpe wrote: > > > > On Tue, Aug 27, 2024 at 09:59:54AM -0700, Nicolin Chen wrote: > > > > > > > > > +static int arm_smmu_viommu_cache_invalidate(struct > > iommufd_viommu *viommu, > > > > > + struct iommu_user_data_array > > *array) > > > > > +{ > > > > > + struct iommu_domain *domain = > > iommufd_viommu_to_parent_domain(viommu); > > > > > + > > > > > + return __arm_smmu_cache_invalidate_user( > > > > > + to_smmu_domain(domain), viommu, array); > > > > > > > > I'd like to have the viommu struct directly hold the VMID. The nested > > > > parent should be sharable between multiple viommus, it doesn't make > > > > any sense that it would hold the vmid. > > > > > > > > This is struggling because it is trying too hard to not have the > > > > driver allocate the viommu, and I think we should just go ahead and do > > > > that. Store the vmid, today copied from the nesting parent in the vmid > > > > private struct. No need for iommufd_viommu_to_parent_domain(), just > > > > rework the APIs to pass the vmid down not a domain. > > > > > > OK. When I designed all this stuff, we still haven't made mind > > > about sharing the s2 domain, i.e. moving the VMID, which might > > > need a couple of more patches to achieve. > > > > Yes, many more patches, and don't try to do it now.. But we can copy > > the vmid from the s2 and place it in the viommu struct during > > allocation time. > > > > does it assume that a viommu object cannot span multiple physical > IOMMUs so there is only one vmid per viommu? I think so. One the reasons of introducing vIOMMU is to maintain the shareability across physical IOMMUs at the s2 HWPT_PAGING. Thanks Nicolin