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envelope-from=jgg@nvidia.com; helo=NAM11-CO1-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+alex.bennee=linaro.org@nongnu.org Sender: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org X-TUID: 5EhXjejQdeNl On Wed, Nov 27, 2024 at 10:21:24AM +0000, Shameerali Kolothum Thodi wrote: > > For SMMUv3, NVIDIA-specific vCMDQ, it needs a parameter to state that > > specifically, > > since I'm concluding from reading the SMMUv3 version G.a spec, that > > ECMDQ was added > > to be able to assign an ECMDQ to a VM, > > Not sure the intention of ECMDQ as per that specification is to assign > it to a VM. I think the main idea behind it is to have one Command Queue > per host CPU to eliminate lock contention while submitting commands > to SMMU. Right > AFAIK it is not safe to assign one of the ECMDQ to guest yet. I think there is no > way you can associate a VMID with ECMDQ. So there is no plan to > support ARM ECMDQ now. Yep > NVIDIA VCMDQ is a completely vendor specific one. Perhaps ARM may come > up with an assignable CMDQ in future though. Yes, it is easy to imagine an ECMDQ extension that provides the same HW features that VCMDQ has in future. I hope ARM will develop one. > > ... and all needs to be per-instance .... > > ... libvirt (or any other VMM orchestrator) will need to determine > > compatibility for > > live migration. e.g., can one live migrate an accel=nv-vcmdq-based VM to > > a host with > > accel=ecmdq support? only nv-vcmdq? what if there are version diffs of > > nv-vcmdq over time? > > -- apologies, but I don't know the minute details of nv-vcmdq to > > determine if that's unlikely or not. > > Yes. This require more thought. But our first aim is get the basic smmuv3-accel > support. Yeah, there is no live migration support yet in the SMMU qmeu driver, AFAIK? When it gets done the supported options will have to be considered Jason