I assume that the continuing failure to build VB on Kernel_HEAD_standard means that you have decided against making the special kernel changes proposed in my patch. I have been unable to find a work-around, thus I will soon push a patch that will allow VB to build with kernel 5.8; however, it will not run. Once 5.8 is released and becomes the default kernel in Tumbleweed, users will be forced to switch to use KVM rather than VB.