vfio-pci: Mark non-migratable

We haven't magically fixed this yet.  Toss in a description too.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>

hw/vfio_pci.c

@@ -1946,6 +1946,10 @@ static Property vfio_pci_dev_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
+static const VMStateDescription vfio_pci_vmstate = {
+    .name = "vfio-pci",
+    .unmigratable = 1,
+};
 
 static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
 {
@@ -1954,6 +1958,8 @@ static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
 
     dc->reset = vfio_pci_reset;
     dc->props = vfio_pci_dev_properties;
+    dc->vmsd = &vfio_pci_vmstate;
+    dc->desc = "VFIO-based PCI device assignment";
     pdc->init = vfio_initfn;
     pdc->exit = vfio_exitfn;
     pdc->config_read = vfio_pci_read_config;