Can you combine virtualisation systems?

• Yes.

• VMWare/QEmu + *
• bochs host + vserver kernel
• UML w/vserver patch (part of standard 2.6 kernel)
• Xen host with Xen guest + vserver patch (proof of concept)
• * + further chroot()s
• vserver + vserver (if explicitly allowed for a vserver)
• vserver + UML (w/o SKAS)

• No.

• vserver + vserver (if not allowed)
• * + Kernel virtualisation systems