Re: [libvirt] [PATCH 3/6] pci: Introduce virPCIStubDriver enumeration

>  >  typedef enum { > +    VIR_PCI_STUB_DRIVER_XEN = 0, > +    VIR_PCI_STUB_DRIVER_KVM, > +    VIR_PCI_STUB_DRIVER_VFIO, > +    VIR_PCI_STUB_DRIVER_LAST > +} virPCIStubDriver;   Is there any specific reason to explicitly set _XEN = 0? I mean, by default any new PCI device that we create in memory (virPCIDeviceNew()) will have _XEN as stub driver until set by virPCIDeviceSetStubDriver(). I'm not saying it's wrong, just asking.   For instance, if we reserve zero for a special case when stub driver hasn't been set, we can throw an error and detect a bug in our code.