CentOS 7: Suspend and resume KVM guest machine automatically on reboot

Install libvirt-client which includes libvirt-guest.

$ sudo yum install -y libvirt-client

Edit /etc/sysconfig/libvirt-guest as below.

$ diff -uprN /etc/sysconfig/libvirt-guest{.org,}
--- /etc/sysconfig/libvirt-guest.org   2016-10-18 19:39:11.046386785 +0900
+++ /etc/sysconfig/libvirt-guest       2016-10-18 19:40:30.674745950 +0900
@@ -8,7 +8,7 @@
 # - ignore  libvirt-guest init script won't start any guest on boot, however,
 #           guest marked as autostart will still be automatically started by
 #           libvirtd
-#ON_BOOT=start
+ON_BOOT=start

 # Number of seconds to wait between each guest start. Set to 0 to allow
 # parallel startup.
@@ -22,7 +22,7 @@
 #             which just needs a long time to shutdown. When setting
 #             ON_SHUTDOWN=shutdown, you must also set SHUTDOWN_TIMEOUT to a
 #             value suitable for your guest.
-#ON_SHUTDOWN=suspend
+ON_SHUTDOWN=suspend

 # If set to non-zero, shutdown will suspend guest concurrently. Number of
 # guest on shutdown at any time will not exceed number set in this variable.

Enable libvirt-guest and reboot host machine.

$ sudo systemctl enable libvirt-guest
$ sudo reboot

After reboot, when shutdowning host machine with runnning guest machine, guest machine will be suspended automatically. When booting host machine, suspended guest machine will be resumed automatically.