[Users] kvm guest (via libvirt) cannot start under openvz 6 (2.6.32) kernel

[CoolCold]

Hello!
I'm experiencing strange issue - cannot start KVM guest on machine
under 2.6.32 openvz kernel. Booting into kernel 4.9 on the same
system, works perfectly okay. Error message:

root at nekotaz:~# virsh start debian-8-jessie-amd64-01
error: Failed to start domain debian-8-jessie-amd64-01
error: internal error: qemu unexpectedly closed the monitor:
2018-07-22T13:32:03.402797Z qemu-system-x86_64: cannot set up guest
memory 'pc.ram': Cannot allocate memory

VM definition for memory:
root at nekotaz:~# virsh dumpxml debian-8-jessie-amd64-01|fgrep -i memo
  <memory unit='KiB'>2194304</memory>
  <currentMemory unit='KiB'>2194304</currentMemory>

root at nekotaz:~# uname -r
2.6.32-openvz-042stab131.1-amd64
root at nekotaz:~# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 8.11 (jessie)
Release:        8.11
Codename:       jessie

beancounters for host node shows 0 overruns (fail counter). Something
else is limiting, struggle to find what is it. Advises are appreciated
.

-- 
Best regards,
[COOLCOLD-RIPN]