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Linux-VServer was designed to be mostly architecture agnostic, therefore only a small part, the syscall definition itself, is architecture specific. Nevertheless some architectures have private copies of basically architecture independent code for whatever reason, and therefore small modifications are often required.
The following architectures are supported and some of them are even tested:
Adding a new architecture is relatively simple although extensive testing is required to make sure that every feature is working as expected (and of course, the hardware ;).