See [cyperciti.biz faq](https://www.cyberciti.biz/faq/linux-xen-vmware-kvm-intel-vt-amd-v-support/)

Look in `/proc/cpuinfo` and look at `flags`.  The `lm` flag means the CPU is in 64bit mode. 
The `vmx` flag means virtualisation is enabled on an [Intel CPU](/hardware/cpu/intel).
The `svm` flag means virtualisation is enabled on an [AMD CPU](/hardware/cpu/amd).
The `aes` flag means [hardware AES](/hardware/cpu/aes) is avaiable.
So
```bash
grep -q -E 'vtx|svm' /proc/cpuinfo && echo "Virtualisation enabled£
```