Gracefully shutdown libvirtd VMs on shutdown. Start and enable the provided systemd service for it to work.

graceful-libvirtd-shutdown.service

[Unit]
Description=Wait for VMs to shutdown gracefully
After=libvirtd.service

[Service]
Type=oneshot
RemainAfterExit=true
ExecStop=/home/ntrrgc/dotfiles/bin/vm-shutdown

[Install]
WantedBy=multi-user.target

vm-shutdown

#!/bin/bash
# File: /root/bin/virt-shutdown.sh
# Description: Shutdown active virtual machines
# Author: Ed Heron <Ed@Heron-ent.com> 
# Date: 2009.11.13 Copy placed on centos-virt@centos.org
# Note: 2009.11.23 Bugfixes and hoovering by torkil 

DEBUG=1 # Comment this out if you really want to use this script in production
#FAKE=1  # Comment this out if you really want to use this script in production

# Get list of active virtual machines
vmList="`virsh list | (
    while read vmID vmName vmStatus
     do
      if [ -n "$vmName" -a "$vmName" != "Name" -a "$vmName" != "Domain-0" ]
       then
        [ -z "$vmList" ] && vmList="$vmName" || vmList="$vmList $vmName"
      fi
    done
    echo $vmList )`"

# check there are some active VM's
if [ -n "$vmList" ]
then
  # Shutdown VM's with verification
  for vmName in $vmList
  do
    # Send initial request
    [ -n "$DEBUG" ] && echo -n "Attempting to shutdown $vmName "
    [ -z "$FAKE" ] && virsh shutdown $vmName

    # wait a limited time for the VM to be not running
    count=30
    while ( virsh list | grep $vmName >/dev/null ) && [ $count -gt 0 ]
    do
      sleep 1
      let count=count-1
      [ -n "$DEBUG" ] && echo -n "."
    done

    # report current status
    ( virsh list | grep $vmName >/dev/null ) && echo " failed!" || echo " down."

    # if still running, destroy it
    if ( virsh list | grep $vmName >/dev/null )
    then
      [ -n "$DEBUG" ] && echo -n "Attempting to destroy $vmName "
      [ -z "$FAKE" ] && virsh destroy $vmName

      # wait a limited time for the VM to be not running
      count=60
      while ( virsh list | grep $vmName >/dev/null ) && [ $count -gt 0 ]
      do
        sleep 1
        let count=count-1
        [ -n "$DEBUG" ] && echo -n "."
      done

      # report current status
      ( virsh list | grep $vmName >/dev/null ) && echo " failed!" || echo " down."
    fi
  done
fi