Description of problem:
- When running VM with:
Operating system - Windows (any of them)
BIOS type: Q35 Chipset with Legacy BIOS
Custom Emulated Machine - Q35

The VM failed to run with the net vdsm.log ERROR:

2020-03-05T13:38:45.582848Z qemu-kvm: kvm_init_vcpu failed: Function not implemented (code=1) (vm:1598)
2020-03-05 15:38:47,110+0200 ERROR (jsonrpc/3) [virt.vm] (vmId='b5e31069-0911-4527-a8b8-861f528cc468') Operation failed (vm:4788)
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/vdsm/virt/vm.py", line 4753, in setCpuTuneQuota
    self._dom.setSchedulerParameters({'vcpu_quota': int(quota)})
  File "/usr/lib/python3.6/site-packages/vdsm/virt/virdomain.py", line 101, in f
    ret = attr(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/vdsm/common/libvirtconnection.py", line 131, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/vdsm/common/function.py", line 94, in wrapper
    return func(inst, *args, **kwargs)
  File "/usr/lib64/python3.6/site-packages/libvirt.py", line 2555, in setSchedulerParameters
    if ret == -1: raise libvirtError ('virDomainSetSchedulerParameters() failed', dom=self)
libvirt.libvirtError: Requested operation is not valid: cgroup CPU controller is not mounted

- The VM is running successfully when changing BIOS to legacy and custom emulated machine to pc-i440fx


Version-Release number of selected component (if applicable):
ovirt-engine-4.4.0-0.24.master.el8ev
vdsm-4.40.5-1.el8ev.x86_64
qemu-kvm-4.2.0-13.module+el8.2.0+5898+fb4bceae.x86_64
libvirt-daemon-6.0.0-7.module+el8.2.0+5869+c23fe68b.x86_64


How reproducible:
100%

Steps to Reproduce:
1. Create new VM with Operating system - Windows (any of them)
BIOS type: Q35 Chipset with Legacy BIOS
Custom Emulated Machine - Q35
2. Run VM
3.

Actual results:
VM failed to run

Expected results:
It should be possible to run VM with Q35 chipset.

Additional info:
vdsm.log and engine.log attached