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What works


Notes:

Essentially all normal user-mode processes work the same as in a native kernel. The exceptions are processes which execute privileged instructions. hwclock is the normal culprit in a normal installation. Distribution installation procedures are the other main class of such processes. They tend to try to probe the hardware, which on UML isn't going to work. Running a UML inside another UML also currently doesn't work.
Networking works, both between virtual machines and between a virtual machine and the host and outside net.
All filesystems and network protocols work as they do on a native kernel.
X works both as a client on the host X server and as a server with Xnest as the local X server.
Kernel modules also work as they do on a native kernel.