Palacios 1.3 Released The V3VEE Project at Northwestern University, the University of New Mexico, the University of Pittsburgh, Sandia National Labs, and Oak Ridge National Lab are pleased to announce the release of Palacios 1.3, a substantially enhanced version of this open-source virtual machine monitor. Palacios provides an an open substrate for virtualization research, development, use, and teaching in computer systems, computer architecture, and high performance computing. Palacios is a virtual machine monitor (VMM) that is available for public use as a community resource. It is highly configurable and designed to be embeddable into different host operating systems, such as Linux and the Kitten lightweight kernel. Palacios is a non-paravirtualized VMM that makes extensive use of the virtualization extensions in modern Intel and AMD x86 processors. A compact codebase (<100,000 lines for 1.3), Palacios has been designed to be easy to understand and readily configurable for different environments. It is unique in being designed to be embeddable into other OSes instead of being implemented in the context of a specific OS. Compared to 1.3, significant new functionality has been added, including support for multicore guests, support for embedding as a Linux kernel module, the VNET/P overlay network system, simple checkpoint/restore, host devices, graphics consoles and VGA, and virtual core migration. Enhancements are present throughout the codebase. Currently, Palacios can run on commodity PC hardware, and Cray XT3/4 machines such as Red Storm. Palacios is BSD-licensed and available from http://v3vee.org. Detailed instructions on how to download, install, build, and use Palacios are available at http://v3vee.org. The site also includes links to the relevant discussion groups. Community enhancements to Palacios are very much welcomed. The V3VEE Project is supported by the United States National Science Foundation and the Department of Energy. --The V3VEE Team