msix: Add VmFd to MsixConfig

Because MsixConfig will be responsible for updating the KVM GSI routes
at some point, it must have access to the VmFd to invoke the KVM ioctl
KVM_SET_GSI_ROUTING.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

vfio/src/vfio_pci.rs

@@ -412,7 +412,7 @@ impl VfioPciDevice {
             table,
             pba,
         };
-        let msix_config = MsixConfig::new(msix_cap.table_size(), allocator);
+        let msix_config = MsixConfig::new(msix_cap.table_size(), allocator, self.vm_fd.clone());
 
         self.interrupt.msix = Some(VfioMsix {
             bar: msix_config,