The system devices screen is really helpful for looking at IOMMU groups and devices to pass through to VMs. However, it currently does not display which devices are Reset enabled, which is particularly useful for USB controllers.

 

I use SpaceInvaderOne's command to look at this. Adding this extra piece of info to the System Devices would be a simple but welcome addition.

 

for iommu_group in $(find /sys/kernel/iommu_groups/ -maxdepth 1 -mindepth 1 -type d);do echo "IOMMU group $(basename "$iommu_group")"; for device in $(\ls -1 "$iommu_group"/devices/); do if [[ -e "$iommu_group"/devices/"$device"/reset ]]; then echo -n "[RESET]"; fi; echo -n $'\t';lspci -nns "$device"; done; done

 

There is a new plugin called "vfio pci config" that does that plus allow you to comfortably stub devices to prepare them for passthru. Check it out