Cannot boot linux vm with more than 1tb ram

I’m trying to setup several linux vms with 1+ TB of ram and they always kernel panic when set to any value over 1TB. I’ve looked around and tried setting:
I’ve also tried other firmware options to see if that had any impact. Any help would be appreciated.
The kernel panic message as best i can find is: 0010:ioread16_rep+0x4e/0xb0

setting the machine type to one with -hpb in the name resolved the issue:

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