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Mon, 8 Sep 2025 13:40:33 +0000 Received: from PH7PR12MB5757.namprd12.prod.outlook.com ([fe80::f012:300c:6bf4:7632]) by PH7PR12MB5757.namprd12.prod.outlook.com ([fe80::f012:300c:6bf4:7632%2]) with mapi id 15.20.9094.017; Mon, 8 Sep 2025 13:40:32 +0000 Date: Mon, 8 Sep 2025 10:40:30 -0300 From: Jason Gunthorpe To: Shameer Kolothum Cc: "eric.auger@redhat.com" , "qemu-arm@nongnu.org" , "qemu-devel@nongnu.org" , "peter.maydell@linaro.org" , Nicolin Chen , "ddutile@redhat.com" , "berrange@redhat.com" , Nathan Chen , Matt Ochs , "smostafa@google.com" , "linuxarm@huawei.com" , "wangzhou1@hisilicon.com" , "jiangkunkun@huawei.com" , "jonathan.cameron@huawei.com" , "zhangfei.gao@linaro.org" , "zhenzhong.duan@intel.com" , "shameerkolothum@gmail.com" Subject: Re: [RFC PATCH v3 07/15] hw/arm/smmuv3: Implement get_viommu_cap() callback Message-ID: <20250908134030.GG616306@nvidia.com> References: <20250714155941.22176-1-shameerali.kolothum.thodi@huawei.com> <20250714155941.22176-8-shameerali.kolothum.thodi@huawei.com> Content-Type: text/plain; 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envelope-from=jgg@nvidia.com; helo=NAM11-BN8-obe.outbound.protection.outlook.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FORGED_SPF_HELO=1, SPF_HELO_PASS=-0.001, SPF_NONE=0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, Sep 08, 2025 at 08:22:59AM +0000, Shameer Kolothum wrote: > > nit: strictly speaking couldn't we have a stage2 being used at guest > > level implemented by a stage1 at physical level? > > but it is totally fair to restrict the support. > > Yeah it is possible I guess. But then we have to use the S2TTB to configure > Host SMMUv3 S1 instead of S1ContextPtr which is used now. S1 and S2 have different PTE formats, you cannot take a guest S2 table with S2 PTEs and have the hypervisor program it to a S1. The guest must see a SMMU with no S2 support in the IDRs. Jason