If you get this crash after booting macOS in KVM with AMD GPU passthrough you'll need to disable Above 4GB decoding on your BIOS/UEFI Setup.
qemu-system-x86_64: kvm_set_user_memory_region: KVM_SET_USER_MEMORY_REGION failed, slot=6, start=0xc004800000000000, size=0x200000000: Invalid argument kvm_set_phys_mem: error registering slot: Invalid argument
./boot-passthrough.sh: línea 90: 3507 Aborted (`core' generado) qemu-system-x86_64 "${args[@]}"
That fixed it.