tests: Add split_irqchip test

Based on the newly added code, we expect the split irqchip to be used.
This means we should not see any "timer" or "cascade" components
attached to the IOAPIC since our userspace IOAPIC does not advertise
those.

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

src/main.rs

@@ -416,4 +416,44 @@ mod tests {
             Ok(())
         });
     }
+
+    #[test]
+    fn test_split_irqchip() {
+        test_block!(tb, "", {
+            let (disks, fw_path) = prepare_files();
+            let mut child = Command::new("target/debug/cloud-hypervisor")
+                .args(&["--cpus", "1"])
+                .args(&["--memory", "512"])
+                .args(&["--kernel", fw_path.as_str()])
+                .args(&["--disk", disks[0], disks[1]])
+                .args(&["--net", "tap=,mac=,ip=192.168.2.1,mask=255.255.255.0"])
+                .spawn()
+                .unwrap();
+
+            thread::sleep(std::time::Duration::new(10, 0));
+
+            aver_eq!(
+                tb,
+                ssh_command("cat /proc/interrupts | grep 'IO-APIC' | grep -c 'timer'")
+                    .trim()
+                    .parse::<u32>()
+                    .unwrap(),
+                0
+            );
+            aver_eq!(
+                tb,
+                ssh_command("cat /proc/interrupts | grep 'IO-APIC' | grep -c 'cascade'")
+                    .trim()
+                    .parse::<u32>()
+                    .unwrap(),
+                0
+            );
+
+            ssh_command("sudo reboot");
+            thread::sleep(std::time::Duration::new(10, 0));
+            let _ = child.kill();
+            let _ = child.wait();
+            Ok(())
+        });
+    }
 }