Did you install some specific agent within VM to utilize vgtbuffer ioctl 
interface? It’s not a bare metal i915 interface so suppose it shouldn’t be 
invoked for a default Linux distro environment. Yes we should add check to 
prevent it from being used within VM.

However this error has nothing to do with your laggy UI issue. From my 
experience such issue is most likely being caused by losing interrupts. For 
example I saw below error message in your log (only partial line):

[ 5412.902817] vGT error:(vgt_handle_events:1845) IRQ: abandon non-registered [)

You can look into the event detail to see whether such event should be 
explicitly handled on your platform.

Thanks
Kevin
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