On 2/18/2026 12:05 AM, Shameer Kolothum Thodi wrote:
Introduce support for a "cmdqv" IOMMU attribute which enables NVIDIA Tegra241 CMDQV, an extension for ARM SMMUv3. This supports passthrough of physical SMMU-CMDQ linked command queue from host space to a VM. Currently the v2 QEMU vCMDQ series uses the "tegra241-cmdqv" property to enable NVIDIA Tegra241 CMDQV. There is a suggestion to change this to a generic "cmdqv" property and probe the host CMDQV extension type from the kernel. Also, plan is to change it to ON_OFF_AUTO format like the suggestion for other properties like ril and ats etc
I am currently looking into that. From a libvirt point of view, not sure this will have much impact, but just a heads up.
Ok, I will keep track of the QEMU series refreshes and support the generic "cmdqv" property with ON_OFF_AUTO format when sent to the mailing list. Thanks, Nathan