Of the listed guests I assume Ubuntu 18.04 has the newest guest Kernel (read virtio drivers). Several questions to ensure this is right:
1. could you report the kernel version of each of your test guests (assuming 4.4 and 4.15 for Ubuntu, but the exact version would be great to know) 2. it would be great to know if one of the newer qemu versions that already exist fix the virtio handling of this case. So once you recreated your case could you upgrade through the Ubuntu Cloud Archive provided versions and let us know if some of them work (and if so which ones exactly). That might help a lot to track down a potentially existing virtio fix. Just one by one upgrade the newer versions from [1] on source and target host. Then shutdown and re-start your guest on the migration source and then migrate again. 3. #2 above changed qemu, the other element we might change is that you use the 4.15 based HWE kernel in a 16.04 guest - would that then fail just as the 18.04 guest does? In general, I wonder what on this should be Power specific since it should after all use the same virtio drivers and host code. I have seen other similar reports which always ended up as host/guest mismatch of virtio-handling - but never an arch specific one yet. [1]: https://wiki.ubuntu.com/OpenStack/CloudArchive ** Changed in: qemu (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1783140 Title: KVM live migration fails Status in The Ubuntu-power-systems project: New Status in linux package in Ubuntu: New Status in qemu package in Ubuntu: Incomplete Bug description: Environment: 2 POWER8 with Ubuntu 16.04.4 LTS as KVM hypervisor. 1 KVM guest with Ubuntu 18.04 LTS. Virtual disk for the guest is a qcow2 file on an NFS share, accessible from both hypervisors, so live migration is possible and works for all other guests (SLES, RHEL, Ubunutu 16.04), Live migratino of Ubuntu 18.04 guest fails on ppc, while the same test on an x86_64 environment suceeds. root@pkvm2:~# virsh migrate --persistent --live p8lnxtst4 qemu+ssh://pkvm1/system error: internal error: early end of file from monitor, possible problem: 2018-07-23T11:12:25.586385Z qemu-system-ppc64: VQ 0 size 0x100 Guest index 0x38aa inconsistent with Host index 0xa980: delta 0x8f2a 2018-07-23T11:12:25.586434Z qemu-system-ppc64: error while loading state for instance 0x0 of device 'pci@800000020000000:01.0/virtio-net' 2018-07-23T11:12:25.587246Z qemu-system-ppc64: load of migration failed: Operation not permitted root@pkvm2:~# uname -a Linux pkvm2 4.4.0-130-generic #156-Ubuntu SMP Thu Jun 14 08:51:21 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1783140/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
