SmartOS brings KVM to the Solaris kernel
A team of developers from cloud provider Joyent has ported the Linux kernel hypervisor to Illumos' open source OpenSolaris kernel. The developers say that the KVM (kernel-based virtual machine) adds hardware-supported virtualisation to the SmartOS, complementing the Solaris-based kernel's virtualisation system, Zones, which allows multiple user environments to run in isolation from each other under a single kernel. The operating system also incorporates a BSD package management system and a GNU toolchain.
You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump