vmm: Retry running a CPU when getting EAGAIN or EINTR from the run ioctl

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

vmm/src/vm.rs

@@ -414,12 +414,19 @@ impl<'a> Vm<'a> {
                                     VcpuExit::IoapicEoi => {}
                                     VcpuExit::Hyperv => {}
                                 },
-                                Err(e) => {
+                                Err(Error::VcpuRun(ref e)) => {
+                                    match e.raw_os_error().unwrap() {
+                                        // Why do we check for these if we only return EINVAL?
+                                        libc::EAGAIN | libc::EINTR => {}
+                                        _ => {
                                             println! {"VCPU {:?} error {:?}", cpu_id, e};
                                             break;
                                         }
                                     }
                                 }
+                                _ => (),
+                            }
+                        }
                     })
                     .map_err(Error::VcpuSpawn)?,
             );