uefi separation of the layer from the driver?

[xSanx]

I apologize for the stupid question, why do I need a driver in Windows, what does it virtualize?

[hypervisor]

It needs a driver because that is the only real way to enter CPL0 (kernel mode) which is required for VMX instructions. This virtualizes all your processors.

[xSanx]

that is, they work together? I assumed that the hypervisor works as a layer between windows and uefi

[hypervisor]

You misunderstand what a hypervisor is and the difference between type 1 and 2. A type 2 hypervisor needs a driver to run, as it is self hosted. Although the typical hypervisor itself doesn’t really depend on the OS, it needs a driver to execute in kernel mode (CPL0).