> AWS has Nitro which seems to have been based on KVM but likely quite different by now. It still is relatively stock KVM on the CPU side of things. They've b

> AWS has Nitro which seems to have been based on KVM but likely quite different by now. It still is relatively stock KVM on the CPU side of things. They've been upstreaming changes they need like lower overhead for emulating Xen's hypercall interface. Most of their special sauce is in the devices though, as those natively provide VM boundaries leaving the hypervisor to not have to manage all that much at runtime.