We have the same problem. With E5-2690 v4 and E5-2690 v1 CPUs.
Kernel in the VM doesn't matter, Centos 7, Debian 10,11,12 with their kernels had the problem.
All VMs have CPU-Type kvm64.
Example config of an vm is:
bootdisk: virtio0
cores: 2
ide2: none,media=cdrom
memory: 8192
name: varnish-t...