I have been running a hybrid Linux/Windows box for some time now, using Xen. Xen is a bare-metal hypervisor with many powerful features, including the ability to map physical hardware (say, a graphics card) to guest VMs. I have struggled with getting USB to work seamlessly, however. My hardware prevents me from mapping a physical USB device to the guest, so I needed a different solution.
Xen allows emulated USB controllers to be mapped to the guest, and this works well. One important feature is missing, however. It is not possible to automatically connect a device to the guest when it is plugged in.
A lot of research and some diving into the code brought me to a solution, however. Utilizing the udev interface in linux and the low-level hypervisor interfaces, I can hot-plug devices at run-time. This post describes how I got there.
The source code discussed in this article can be found, in full, at https://github.com/stephen-czetty/xen-auto-usb.Continue reading “Hot-plugging USB into a Xen VM from a script”