[vfio-users] How to check the device is using or not by VM

[Eddie Yen]

Hi everyone, as title.

I know this is a silly question, because you just need to check VM is on or
off to know the VFIO device is occupied or not.

But I have this requirement when I'm using pass-through on OpenStack.
Because you don't know which device that OpenStack will choose if you got
multiple devices on same model.

Using lspci -k is another way, but since these devices already controlled
by vfio-pci, it's hard to know which device is occupied.

Is VFIO have a command to do that? Or any other way to know the device is
using by VM?


Bad English, so the question may not clear.

Many thanks,
Eddie.
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