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Wed, 16 Jul 2025 18:42:40 +0000 Received: from CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732]) by CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732%7]) with mapi id 15.20.8901.033; Wed, 16 Jul 2025 18:42:40 +0000 Date: Wed, 16 Jul 2025 15:42:39 -0300 From: Jason Gunthorpe To: Nicolin Chen Cc: Shameer Kolothum , qemu-arm@nongnu.org, qemu-devel@nongnu.org, eric.auger@redhat.com, peter.maydell@linaro.org, ddutile@redhat.com, berrange@redhat.com, nathanc@nvidia.com, mochs@nvidia.com, 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 14/15] Read and validate host SMMUv3 feature bits Message-ID: <20250716184239.GC2177622@nvidia.com> References: <20250714155941.22176-1-shameerali.kolothum.thodi@huawei.com> <20250714155941.22176-15-shameerali.kolothum.thodi@huawei.com> <20250716115123.GW2067380@nvidia.com> <20250716174506.GB2177622@nvidia.com> Content-Type: text/plain; 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envelope-from=jgg@nvidia.com; helo=NAM10-MW2-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@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-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org On Wed, Jul 16, 2025 at 11:09:45AM -0700, Nicolin Chen wrote: > OK. I see your point. That will leads to a very long list of > parameters. I would have some useful prebaked ones. Realistically there are not that many combinations of HW capabilities that are interesting/exist. > So, a vSMMU model is defined following the parameters in the > command line. A device (and its attaching SMMU HW) that's not > compatibile should just fail the cold-plug at the beginning. Yes And if you want to do hotplug the SMMU is already fully defined so you don't need to discover anything at VM startup time. Jason