Ideally, running on a hypervisor is absolutely identical to running on bare metal, and any difference the guest can detect is a bug in the hypervisor and/or the

Ideally, running on a hypervisor is absolutely identical to running on bare metal, and any difference the guest can detect is a bug in the hypervisor and/or the hardware. That was the value proposition of CP-40 back in the 1960s, right down to being able to run newer versions of CP (later called VM) as a guest on older versions, in order to develop and debug the next generation of hypervisor in a known-good environment which is, again, utterly indistinguishable from running on bare metal. https://en.wikipedia.org/wiki/IBM_CP-40 https://en.wikipedia.org/wiki/IBM_CP-40 I wonder how long it'll take the rest of the world to achieve that.