nvidia.ko does not support dynamic unbinding of devices. I've filed a bug with them, they closed it wontfix. You need to follow the guides to have the VM graphics card bound to pci-stub or vfio-pci directly rather than letting it bind to nvidia. See for instance http://vfio.blogspot.com/2015/05/vfio-gpu-how-to-series-part-3-host.html
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