I applied harvester-pcidevices-controller to activate GPU-passthrough function. I installed windows server R12 and attached a nvidia 2080 Ti to this VM. It works. Why do I use window server 2012? Because I can't attach nvidia GPU to windows 10 VM which stuck at 'starting' phase, some libvirt error in logs as well. By the time, it's ok. Now when i backup this 2012 server VM and try 'restore for new' function, I get a blue screen from web console, meanwhile, via window server rdp(3389) i'm able to reach the VM without any proble.