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Kernel vs. process
UML is a process
- from the point of view of the host
UML is a kernel
- from the point of view of its processes
Normally, something is either in userspace in the kernel, but never both. However, UML can be looked as being both. It is obviously a process from the point of view of the host. It can be manipulated in all ways as a process on the host.
However, in a number of other ways, it is clearly a kernel. It is a kernel from the point of view of its processes. It is also clearly a kernel when you look at its code and its structure.
On the other hand, the lowest level of the architecture code, which interacts with the host, is userspace code.