I'm launching a VM using qemu-system-x86_64
. I know two ways to pass through a USB device.
Say for example, I had a mouse that showed up in lsusb like
Bus 003 Device 011: ID 6ade:9582 Amazing Mouse Maker
I could pass it through using
-device usb-host,vendorid=0x6ade,productid=0x9582
or
-device usb-host,hostbus=3,hostaddr=11
Neither of these I really like. If I grab it by Vendor/Product ID then I will never be able to reclaim that mouse until the VM is turned off.
If I grab it by BUS and Device number, then I will have to tell Qemu to reacquire it if I unplug it.
Is it possible for me to send it by Port (the actual physical slot)? Say it's plugged in to Bus 3 Port 2. Can I pass it by that?
Best Answer
For some reason this is not documented on the Qemu 2.12.50 User Doc and I had to learn what I learned from this guy
They mention
But they don't mention that you can do
For example...
If I run lsusb -t and get
I could decide to pass these by
And those correspond to the physical slots.
However the bus and port will differ for a USB 3.0 slot depending on if a USB 2.0 device or USB 3.0 device is plugged into it, but the port for each device will remain consistent.
Such variance does not exist for USB 2.0 slots.
/* update: USB Hubs */
Use dots to separate the ports. So if you had ...
You would use
-device usb-host,hostbus=3,hostport=2.1