Public bug reported:

== Comment: #0 - Satheesh Rajendran <sathe...@in.ibm.com> - 2017-07-19 04:13:18 
==
CPU hotplug operation fails in the host with empty numa nodes(with no memory) 
even though VM placement is static and with/without numad is running.
..
 <vcpu placement='static' current='4'>32</vcpu>
...


# virsh setvcpus virt-tests-vm1 6 --live
error: Invalid value '0-1,16-17' for 'cpuset.mems': Invalid argument


# numactl --hardware
available: 4 nodes (0-1,16-17)
node 0 cpus: 0 8 16 24 32 40
node 0 size: 16188 MB
node 0 free: 1119 MB
node 1 cpus: 48 56 64 72 80 88
node 1 size: 32630 MB
node 1 free: 13233 MB
node 16 cpus: 96 104 112 120 128 136
node 16 size: 0 MB
node 16 free: 0 MB
node 17 cpus: 144 152 160 168 176 184
node 17 size: 0 MB
node 17 free: 0 MB
node distances:
node   0   1  16  17 
  0:  10  20  40  40 
  1:  20  10  40  40 
 16:  40  40  10  20 
 17:  40  40  20  10 

# cat /sys/fs/cgroup/cpuset/cpuset.mems 
0-1

Host:
#uname -a
Linux powerkvm4-lp1 4.10.0-27-generic #30~16.04.2-Ubuntu SMP Thu Jun 29 
16:06:52 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

ii  libvirt-bin                            1.3.1-1ubuntu10.11 
ii  numad                                  0.5+20150602-4 
qemu-kvm                               1:2.5+dfsg-5ubuntu10.14

** Affects: libvirt (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-156806 severity-high 
targetmilestone-inin16043

** Tags added: architecture-ppc64le bugnameltc-156806 severity-high
targetmilestone-inin16043

** Changed in: ubuntu
     Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage 
(ubuntu-power-triage)

** Package changed: ubuntu => libvirt (Ubuntu)

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https://bugs.launchpad.net/bugs/1709877

Title:
  CPU hotplug fails in the system with empty numa nodes, "Invalid value
  '0-1,16-17' for 'cpuset.mems': Invalid argument"

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