How do I add an entire USB controller to a VM?

[kryptys100]

Hi everyone! I'm having trouble figuring out how to bind an entire usb controller to a VM, rather than being limited to just 5 usb ports per VM. Any thoughts? If you need any information about my kernel version and such, I'd be more than happy to supply that info, although I don't know how to give it out at the moment. I'm fairly new to this. Thanks a bunch in advance!

 

[Dunuin]

See PCI Passthrough: https://pve.proxmox.com/wiki/Pci_passthrough
But passing through onboard USB controller will probably not work because of shared IOMMU groups. You might need to buy a USB-PCIe-card and put it in your primary PCIe 16x slot if you are using a consumer mainboard.

 

[psyyo]

Hi everyone! I'm having trouble figuring out how to bind an entire usb controller to a VM, rather than being limited to just 5 usb ports per VM. Any thoughts? If you need any information about my kernel version and such, I'd be more than happy to supply that info, although I don't know how to give it out at the moment. I'm fairly new to this. Thanks a bunch in advance!

as Den mentioned IOMMU groups likely limit this.

Can view your groups with shell script :

#!/bin/bash
shopt -s nullglob
for g in $(find /sys/kernel/iommu_groups/* -maxdepth 0 -type d | sort -V); do
    echo "IOMMU Group ${g##*/}:"
    for d in $g/devices/*; do
        echo -e "\t$(lspci -nns ${d##*/})"
    done;
done;

^ in my case motherboard lan controller shares group with usb controller - so full passthrough was not possible.

you can however, edit the VMs .conf file to explicitly add additional usb (up to 12 total, despite GUIs limit of 4) as xhci devices.
this thread should help >> https://forum.proxmox.com/threads/increase-maximum-usb-devices-in-vm-conf.26551/page-2

 

[kryptys100]

as Den mentioned IOMMU groups likely limit this.

Can view your groups with shell script :

#!/bin/bash
shopt -s nullglob
for g in $(find /sys/kernel/iommu_groups/* -maxdepth 0 -type d | sort -V); do
    echo "IOMMU Group ${g##*/}:"
    for d in $g/devices/*; do
        echo -e "\t$(lspci -nns ${d##*/})"
    done;
done;

^ in my case motherboard lan controller shares group with usb controller - so full passthrough was not possible.

you can however, edit the VMs .conf file to explicitly add additional usb (up to 12 total, despite GUIs limit of 4) as xhci devices.
this thread should help >> https://forum.proxmox.com/threads/increase-maximum-usb-devices-in-vm-conf.26551/page-2

Oh ok thank you! I’ll probably try the second one first because that seems easier to me personally. I’ll try those out tomorrow! I’ll get back to you!