vm_unassign_pptdev
int vm_unassign_pptdev(struct vmctx *ctx, int bus, int slot, int func);
int vm_unassign_pptdev(struct vm *vm, int bus, int slot, int func);
vm_unassign_pptdev(vm, bus, slot, func);
error = vm_unassign_pptdev(vm, pptdev->bus, pptdev->slot,
vm_unassign_pptdev(pi->pi_vmctx, bus, slot, func);
error = vm_unassign_pptdev(ctx, bus, slot, func);