Create a virtual machine with 16 GiB RAM, 250 GiB storage, 8 cores with hyperthreading, a specific CPU topology, and a CPU model that shares most features with the host CPU
virt-install --name vm_name --cpu host-model,topology.sockets=1,topology.cores=4,topology.threads=2 --memory 16384 --disk path=path/to/image.qcow2,size=250 --cdrom path/to/debian.iso