category, count user-level-risc-v, 1 ppc, 1 graphic, 1 user-level, 6 arm, 1 operating system, 5 KVM, 2 permissions, 7 risc-v, 7 network, 1 semantic-x86, 6 debug, 1 none, 2 PID, 1 vnc, 1 TCG, 1 register, 2 VMM, 1 all, 37 virtual, 2 peripherals, 3