Comment 4 for bug 1838569

With recent release of OpenStack Train this issue reappears...

Upgrading from Stein to Train will require all VMs to be hard-rebooted to be migrated as a final step because Live Migration fails with:

Oct 17 10:28:43 h2.1.openstack.r0cket.net libvirtd[1545]: Unable to read from monitor: Connection reset by peer
Oct 17 10:28:43 h2.1.openstack.r0cket.net libvirtd[1545]: internal error: qemu unexpectedly closed the monitor: 2019-10-17T10:28:42.981201Z qemu-system-x86_64: get_pci_config_device: Bad config data: i=0x10 read: a1 device: 1 cmask: ff wmask: c0 w1cmask:0
                                                          2019-10-17T10:28:42.981250Z qemu-system-x86_64: Failed to load PCIDevice:config
                                                          2019-10-17T10:28:42.981263Z qemu-system-x86_64: Failed to load virtio-balloon:virtio
                                                          2019-10-17T10:28:42.981272Z qemu-system-x86_64: error while loading state for instance 0x0 of device '0000:00:05.0/virtio-balloon'
                                                          2019-10-17T10:28:42.981391Z qemu-system-x86_64: warning: TSC frequency mismatch between VM (2532609 kHz) and host (2532608 kHz), and TSC scaling unavailable
                                                          2019-10-17T10:28:42.983157Z qemu-system-x86_64: warning: TSC frequency mismatch between VM (2532609 kHz) and host (2532608 kHz), and TSC scaling unavailable
                                                          2019-10-17T10:28:42.983672Z qemu-system-x86_64: load of migration failed: Invalid argument