------- Comment From xxd...@de.ibm.com 2018-08-01 05:11 EDT-------
Finally I could have a look on all the other VMs that migrate successful:
RHEL 7U1, kernel 3.10.0-229.20.1.ael7b.ppc64le
RHEL 7U3, kernel 3.10.0-514.6.1.el7.ppc64le
RHEL 7U3, kernel 3.10.0-862.3.2.el7.ppc64
SLES 12SP1, kernel 3.12.49-11-default
SLES 12SP2, kernel 4.4.21-69-default
Ubuntu 16.04.1 LTS, kernel 4.4.0-31-generic

So Ubuntu 18.04 was the first with a kernel really newer than that of
the hypervisor (the SLES 12SP2 kernel is only slightly newer, but still
a 4.4)

I can also do some tests with RHEL 7U5, SLES 12SP3, SLES 15 and Ubuntu
16.10.

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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

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