It seems you need at least: 1. A PowerPC machine (with IOMMU, so I guess it can't be too old). 2. A PCI VGA card. (Emulated, it seems.) 3. IBM VIO bus support compiled in. 4. A KASAN kernel booted to get told about the issue so clearly, otherwise the failure may be much more subtle.

So, yeah, that's quite the confluence of things... Do PowerPC folks usually run their VMs with VGA emulation for example?

EDIT: Actually never mind, I think that just having PCI bus support and VGA arbitration support compiled in may be sufficient, instead of actually having a VGA card (real or not)?