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Mon, 17 Mar 2025 19:24:54 +0000 Received: from CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732]) by CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732%4]) with mapi id 15.20.8534.031; Mon, 17 Mar 2025 19:24:54 +0000 Date: Mon, 17 Mar 2025 16:24:53 -0300 From: Jason Gunthorpe To: Nicolin Chen Cc: Eric Auger , Shameer Kolothum , qemu-arm@nongnu.org, qemu-devel@nongnu.org, 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 Subject: Re: [RFC PATCH v2 03/20] hw/arm/smmuv3-accel: Add initial infrastructure for smmuv3-accel device Message-ID: <20250317192453.GR9311@nvidia.com> References: <20250311141045.66620-1-shameerali.kolothum.thodi@huawei.com> <20250311141045.66620-4-shameerali.kolothum.thodi@huawei.com> <71b73212-3d8f-4c9d-93a4-bf07c0f169e3@redhat.com> Content-Type: text/plain; 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envelope-from=jgg@nvidia.com; helo=NAM12-BN8-obe.outbound.protection.outlook.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.335, 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-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, Mar 17, 2025 at 12:10:19PM -0700, Nicolin Chen wrote: > Another question: how does an emulated device work with a vSMMUv3? > I could imagine that all the accel steps would be bypassed since > !sdev->idev. Yet, the emulated iotlb should cache its translation > so we will need to flush the iotlb, which will increase complexity > as the TLBI command dispatching function will need to be aware what > ASID is for emulated device and what is for vfio device.. I think you should block it. We already expect different vSMMU's depending on the physical SMMU under the PCI device, it makes sense that a SW VFIO device would have it's own, non-accelerated, vSMMU model in the guest. Jason