It looks like MaaS provisioned instances on top of Virsh enabled machines are configured by default with libvirt cpu mode
qemu64. This mode lacks cpu extensions like avx, avx2 which are required to run modern apps, like MongoDB 5+.
As a workaround, I managed to edit the libvirt domain, setting cpu to
host-passthrough then restart the VM.
Is there a setting in MaaS than would configure the libvirt cpu to
host-passthrough, or a setting to add cpu features like avx, avx2?