Description of problem:
I'm working on adding cpu metrics to kubevirt: https://github.com/kubevirt/kubevirt/pull/8774, and we think there is a bug on libvirt since we can't see all cpu metrics when running `virsh domstats 1, the missing metrics are:
cpu.time
cpu.user
cpu.system

and when running `virsh cpu-stats 1`:
virsh # cpu-stats 1
error: Failed to retrieve CPU statistics for domain 'default_vm-cirros'
error: Requested operation is not valid: cgroup CPUACCT controller is not mounted

Version-Release number of selected component (if applicable):
bash-5.1$ virsh version
Authorization not available. Check if polkit service is running or see debug message for more information.
Compiled against library: libvirt 8.7.0
Using library: libvirt 8.7.0
Using API: QEMU 8.7.0
Running hypervisor: QEMU 7.1.0

How reproducible:
100%

Steps to Reproduce:
1.create kubevirt cluster:
-git clone https://github.com/kubevirt/kubevirt.git
-cd kubevirt
-make cluster-up
-make cluster-sync
2. create a vm

• k apply -f examples/vm-cirros.yaml (or other vm)
  3. exec into the launcher
• k get pods
• k exec -it virt-launcher-vm-cirros-6kzfd /bin/bash
  4. query libvirt metrics with virsh
• virsh domstats 1
• virsh cpu-stats 1

Actual results:
Stage 4 missing cpu metrics mentioned here: https://libvirt.org/html/libvirt-libvirt-domain.html#virConnectGetAllDomainStats:~:text=%22cpu.time%22%20%2D%20total%20cpu%20time%20spent%20for%20this%20domain%20in%20nanoseconds%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20as%20unsigned%20long%20long.%0A%20%20%22cpu.user%22%20%2D%20user%20cpu%20time%20spent%20in%20nanoseconds%20as%20unsigned%20long%20long.%0A%20%20%22cpu.system%22%20%2D%20system%20cpu%20time%20spent%20in%20nanoseconds%20as%20unsigned%20long%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20long.

and we get the error:
error: Failed to retrieve CPU statistics for domain 'default_vm-cirros'
error: Requested operation is not valid: cgroup CPUACCT controller is not mounted

Expected results:
Stage 4 will show all cpu metrics mentioned here: https://libvirt.org/html/libvirt-libvirt-domain.html#virConnectGetAllDomainStats:~:text=VIR_DOMAIN_STATS_CPU_TOTAL%3A%20Return%20CPU,cache%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20bank%20%3Cindex%3E

And CPUACCT will be mounted.

Additional info:
Luboslav Pivarc suggested that the issue is related to the fact there is cpu and cpuacct:
https://github.com/libvirt/libvirt/blob/master/src/qemu/qemu_driver.c#L16266
https://github.com/libvirt/libvirt/blob/master/src/util/vircgroupv1.c#L292

Not sure how to add the xml of the VM, and libvirt debug logs, can you share the steps?