i had the same problem with the a6000 - the manual does not really point it out that great but you need to do the following
/usr/lib/nvidia/sriov-manage -e 00:D8:0000.0 - in your case it should be a other device id.
once you did this it will create mdevs - i my case it created ~20 devices with device id +1 or so - meaning you cant use your original device id but need to take one of the others.
i have to do this after each boot ( could do it permanent if i wanted too=)
hope this helps you