KSM can't enable when the node under memory pressure

CNV-v4.20.0.rhel9-70

100%

1.Enable KSM in HCO by using matchLabels
spec:
  ksmConfiguration:
    nodeLabelSelector:
      matchLabels:
        label-test-ksm: ""
2. Add label `label-test-ksm: ""` to one of the node

3. Create 3 vms on that node (by using label selector) 

4. Add annotation to the node to override KSM value:
   kubevirt.io/ksm-free-percent-override: "1.0"

5. Wait when KSM activated on the node

$ oc describe node cnv-qe-infra-02.cnvqe3.lab.eng.rdu2.redhat.com | grep ksm
 kubevirt.io/ksm-enabled=true
 kubevirt.io/ksm-free-percent-override: 1.0
 kubevirt.io/ksm-handler-managed: false

sh-5.1# chroot /host
sh-5.1# cat /sys/kernel/mm/ksm/run
0

1. the value of kubevirt.io/ksm-handler-managed should be "true"
2. /sys/kernel/mm/ksm/run should be 1