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################################# __ __ _ _ ____ ___ \ \/ /___ _ __ | || | | ___| / _ \ \ // _ \ '_ \ | || |_ |___ \| | | | / \ __/ | | | |__ _| ___) | |_| | /_/\_\___|_| |_| |_|(_)____(_)___/ ################################# http://www.xen.org/ What is Xen? ============ Xen is a Virtual Machine Monitor (VMM) originally developed by the Systems Research Group of the University of Cambridge Computer Laboratory, as part of the UK-EPSRC funded XenoServers project. Xen is freely-distributable Open Source software, released under the GNU GPL. Since its initial public release, Xen has grown a large development community, spearheaded by xen.org (http://www.xen.org). The 4.5 release offers a number of improvements, including: improvements for large scale machines during bootup and for PCI passthrough; multiple IO-REQ servers (many QEMUs for a guest); soft affinity for vCPUs (aka NUMA affinity); and API expansion for guest introspection. We also have number of updates for CPU specific changes, such as: Broadwell Supervisor Mode Access Prevention; Haswell Server Cache QoS Monitoring aka Intel Resource Director Technology; further extensions to vAPIC (SandyBridge feature); fixes in AMD microcode loading; Data Breaking Extensions; and further MSR masking support on AMD. On the experimental side we have added a new Real-Time Deferrable Server Based CPU Scheduler (rtds), and PVH initial domain (dom0) support for Intel CPUs. Additionally, 4.5 has a huge update to the ARM code, including support for: up to 1TB in guests; up to 8 CPUs; Power State Coordination Interface (0.2) to power up and down CPUs; UEFI booting; IOMMU support (SMMUv1); Super Page (2MB) support; passthrough of MMIO regions to guests; and lower interrupt latency. The toolstack has expanded to include support for: VM Generation ID (a Windows 2012 Server requirement); Remus initial support (for high availability) in libxl (since xend has been removed); libxenlight JSON support, HVM guest direct kernel boot, and persistent configuration support; systemd support; performance optimizations in oxenstored; and support in QEMU for expanding the PCI hole. Lastly, we have removed the Python toolstack (xend). And as always, there are a number of performance, stability, and security improvements under-the hood. This file contains some quick-start instructions to install Xen on your system. For more information see http:/www.xen.org/ and http://wiki.xen.org/ Quick-Start Guide ================= First, there are a number of prerequisites for building a Xen source release. Make sure you have all the following installed, either by visiting the project webpage or installing a pre-built package provided by your OS distributor: * GCC v4.1 or later * GNU Make * GNU Binutils * Development install of zlib (e.g., zlib-dev) * Development install of Python v2.3 or later (e.g., python-dev) * Development install of curses (e.g., libncurses-dev) * Development install of openssl (e.g., openssl-dev) * Development install of x11 (e.g. xorg-x11-dev) * Development install of uuid (e.g. uuid-dev) * Development install of yajl (e.g. libyajl-dev) * Development install of libaio (e.g. libaio-dev) version 0.3.107 or greater. * Development install of GLib v2.0 (e.g. libglib2.0-dev) * Development install of Pixman (e.g. libpixman-1-dev) * pkg-config * bridge-utils package (/sbin/brctl) * iproute package (/sbin/ip) * GNU bison and GNU flex * GNU gettext * 16-bit x86 assembler, loader and compiler (dev86 rpm or bin86 & bcc debs) * ACPI ASL compiler (iasl) In addition to the above there are a number of optional build prerequisites. Omitting these will cause the related features to be disabled at compile time: * Development install of Ocaml (e.g. ocaml-nox and ocaml-findlib). Required to build ocaml components which includes the alternative ocaml xenstored. * cmake (if building vtpm stub domains) * markdown * figlet (for generating the traditional Xen start of day banner) * systemd daemon development files * Development install of libnl3 (e.g., libnl-3-200, libnl-3-dev, etc). Required if network buffering is desired when using Remus with libxl. See docs/README.remus for detailed information. Second, you need to acquire a suitable kernel for use in domain 0. If possible you should use a kernel provided by your OS distributor. If no suitable kernel is available from your OS distributor then refer to http://wiki.xen.org/wiki/XenDom0Kernels for suggestions for suitable kernels to use. If you are looking to compile a Dom0 kernel from source, please refer to http://wiki.xen.org/wiki/XenParavirtOps. [NB. Unless noted otherwise, all the following steps should be performed with root privileges.] 1. Download and untar the source tarball file. This will be a file named xen-unstable-src.tgz, or xen-$version-src.tgz. You can also pull the current version from the git or mercurial repositories at http://xenbits.xen.org/ # tar xzf xen-unstable-src.tgz Assuming you are using the unstable tree, this will untar into xen-unstable. The rest of the instructions use the unstable tree as an example, substitute the version for unstable. 2. cd to xen-unstable (or whatever you sensibly rename it to). 3. For the very first build, or if you want to destroy build trees, perform the following steps: # ./configure # make world # make install See the documentation in the INSTALL file for more info. This will create and install onto the local machine. It will build the xen binary (xen.gz), the tools and the documentation. You can override the destination for make install by setting DESTDIR to some value. 4. To rebuild an existing tree without modifying the config: # make dist This will build and install xen, tools, and docs into the local dist/ directory. You can override the destination for make install by setting DISTDIR to some value. make install and make dist differ in that make install does the right things for your local machine (installing the appropriate version of udev scripts, for example), but make dist includes all versions of those scripts, so that you can copy the dist directory to another machine and install from that distribution. xenstore: xenstored and oxenstored ==================================== Xen uses a configuration database called xenstore  to maintain configuration and status information shared between domains. A daemon is implemented as part of xenstore to act as an interface for access to the database for dom0 and guests. Two xenstored daemons are supported, one written in C which we refer to as the xenstored (sometimes referred to as cxenstored), and another written in Ocaml called oxenstored. Details for xenstore and the different implementations can be found on the wiki's xenstore reference guide  and the xenstored  page. You can choose which xenstore you want to enable as default on a system through configure: ./configure --with-xenstored=xenstored ./configure --with-xenstored=oxenstored By default oxenstored will be used if the ocaml development tools are found. If you enable oxenstored the xenstored will still be built and installed, the xenstored used can be changed through the configuration file: /etc/sysconfig/xencommons or /etc/default/xencommons You can change the preferred xenstored you want to use in the configuration but since we cannot stop the daemon a reboot will be required to make the change take effect.  http://wiki.xen.org/wiki/XenStore  http://wiki.xen.org/wiki/XenStoreReference  http://wiki.xen.org/wiki/Xenstored Python Runtime Libraries ======================== Various tools, such as pygrub, have the following runtime dependencies: * Python 2.3 or later. URL: http://www.python.org/ Debian: python Intel(R) Trusted Execution Technology Support ============================================= Intel's technology for safer computing, Intel(R) Trusted Execution Technology (Intel(R) TXT), defines platform-level enhancements that provide the building blocks for creating trusted platforms. For more information, see http://www.intel.com/technology/security/. Intel(R) TXT support is provided by the Trusted Boot (tboot) module in conjunction with minimal logic in the Xen hypervisor. Tboot is an open source, pre- kernel/VMM module that uses Intel(R) TXT to perform a measured and verified launch of an OS kernel/VMM. The Trusted Boot module is available from http://sourceforge.net/projects/tboot. This project hosts the code in a mercurial repo at http://tboot.sourceforge.net/hg/tboot.hg and contains tarballs of the source. Instructions in the tboot README describe how to modify grub.conf to use tboot to launch Xen. There are optional targets as part of Xen's top-level makefile that will download and build tboot: install-tboot, build-tboot, dist-tboot, clean-tboot. These will download the latest tar file from the SourceForge site using wget, then build/install/dist according to Xen's settings.