EC2 was famously built on top of Xen, but as of 2017, new instance types are based on Nitro, which uses parts of KVM instead. Brendan Gregg wrote up a good hist

EC2 was famously built on top of Xen, but as of 2017, new instance types are based on Nitro, which uses parts of KVM instead. Brendan Gregg wrote up a good history of this [1] (there may be an updated version somewhere, too). [1]: http://www.brendangregg.com/blog/2017-11-29/aws-ec2-virtualization-2017.html http://www.brendangregg.com/blog/2017-11-29/aws-ec2-virtuali...