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1. PCI pass-through often has problems with IOMMU groups
2. Individual devices connected to USB ports (on the USB ports same controller) cannot be passed through to different virtual machines
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In particular the usbmanager is interacting with several components:
Usage
Pass-
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Through by USB Port
Use lsusb -vt to see which device is connected to which port:
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| Code Block |
|---|
"ioMemberList": [
{
"ztype": "IO_TYPE_USB_CONTROLLER",
"phylabel": "USB Controller Phy",
"assigngrp": "USB-controller-1",
"phyaddrs": {
"PciLong": "0000:14:00.0",
},
"logicallabel": "USB Controller",
"usagePolicy": { }
},
{
"ztype": "IO_TYPE_USB_DEVICE",
"phylabel": "USB device 9",
"assigngrp": "USB",
"phyaddrs": {
"usbaddr": "003:9",
},
"logicallabel": "USB device 9",
"parentassigngrp": "USB-controller-1"
} |
Please note parentassigngrp which makes the dependency between the USB device and the USB controller (connected via PCI).
Pass-
...
Through by USB Vendor ID / Product ID
Use lsusb to see the connected USB devices:
...
| Code Block |
|---|
"ioMemberList": [
{
"ztype": "IO_TYPE_USB_CONTROLLER",
"phylabel": "USB Controller Phy",
"assigngrp": "USB-controller-1",
"phyaddrs": {
"PciLong": "0000:14:00.0",
},
"logicallabel": "USB Controller",
"usagePolicy": { }
},
{
"ztype": "IO_TYPE_USB_DEVICE",
"phylabel": "IntelliMouse",
"assigngrp": "USB",
"phyaddrs": {
"usbproduct": "045e:0823",
},
"logicallabel": "IntelliMouse",
"parentassigngrp": "USB-controller-1"
} |
Restrictions
- Devices connected to a USB hub can be forwarded, but USB hubs themselves unfortunately cannot be forwarded
- The physical port on the device might have a different bus number and port number depending on the usb version of the connected device!
- It (currently) only works with Qemu.
- Pass-through of devices that do PCI over Thunderbolt/USB4 is not supported (might work with PCI pass-through, though)