------- Comment From indira.pr...@in.ibm.com 2018-02-15 06:50 EDT-------
> Tested with qemu 2.11 verison and able to start the guests with more than 1 
> thread.

root@boslcp3:~# uname -r
4.13.0-32-generic

root@boslcp3:~# virsh version
Compiled against library: libvirt 4.0.0
Using library: libvirt 4.0.0
Using API: QEMU 4.0.0
Running hypervisor: QEMU 2.11.0

> Started below guests with threads 2 & 4 without any issues.

root@boslcp3:~# virsh dumpxml boslcp3g1 | grep threads
<topology sockets='2' cores='8' threads='2'/>
root@boslcp3:~#

root@boslcp3g1:~# lscpu
Architecture:        ppc64le
Byte Order:          Little Endian
CPU(s):              16
On-line CPU(s) list: 0-15
Thread(s) per core:  2
Core(s) per socket:  8
Socket(s):           1
NUMA node(s):        2
Model:               2.1 (pvr 004e 1201)
Model name:          POWER9 (architected), altivec supported
Hypervisor vendor:   KVM
Virtualization type: para
L1d cache:           32K
L1i cache:           32K
NUMA node0 CPU(s):   0-7
NUMA node1 CPU(s):   8-15
root@boslcp3g1:~#

root@boslcp3g1:~# ppc64_cpu --smt
SMT=2

> root@boslcp3:~# virsh dumpxml boslcp3g5 | grep threads
<topology sockets='2' cores='4' threads='4'/>

root@boslcp3g5:~# lscpu
Architecture:        ppc64le
Byte Order:          Little Endian
CPU(s):              16
On-line CPU(s) list: 0-15
Thread(s) per core:  4
Core(s) per socket:  4
Socket(s):           1
NUMA node(s):        1
Model:               2.1 (pvr 004e 1201)
Model name:          POWER9 (architected), altivec supported
Hypervisor vendor:   KVM
Virtualization type: para
L1d cache:           32K
L1i cache:           32K
NUMA node0 CPU(s):   0-15

root@boslcp3g5:~# ppc64_cpu --smt
SMT=4
root@boslcp3g5:~#

Regards,
Indira

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https://bugs.launchpad.net/bugs/1742892

Title:
  [Power 9] ISST-LTE:KVM:Ubuntu1804:BostonLC:boslcp3: Unable to start
  the guest with more than 1 thread on ubuntu1804 KVM host machine.

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