DomU Support for Xen
DomU support in Linux distributions
This page describes the current status of support in Linux distributions for running as Xen guests; if you are looking for dom0 support go here.
PV is the regular domU support that has been present in most Linux distributions for years and it is required to run on Amazon EC2 for example.
PV on HVM is a new type of Xen guest support that exploits hardware nested paging while enabling PV interfaces for IO. Depending on the workload PV on HVM guests might be faster or slower than regular PV guests. See [[[XenLinuxPVonHVMdrivers|3]]] for more information.
| Distribution | run as PV guest |
| Debian Lenny | yes |
| Debian Squeeze | yes |
| Ubuntu 10.04 | yes[1] |
| Ubuntu 11.04 | yes[1] |
| Fedora 14 | yes |
| RHEL 5 | yes |
| RHEL 6 | yes |
| SLES 10 | yes |
| SLES 11 | yes |
| OpenSUSE 11.4 | yes |
| Ubuntu 12.04 | yes[1] |
| Fedora 16 | yes |
[1] EC2 kernel only
[2] save/restore is known to have bugs
[3] see XenLinuxPVonHVMdrivers for resources about using optimized (paravirtualized) PV-on-HVM drivers
DomU support in BSDs and other Unix systems
This list is currently incomplete. We are in the process of verifying support for Unixes.
| Distribution | run as PV guest |
| FreeBSD 8.2 | yes[3] |
| NetBSD 5.1 | yes[4] |
| OpenIndiana[5] | no[5] |
[3] See FreeBSD Xen page for more information
[4] See NetBSD Xen HowTo for more information
[5] There has not yet been a stable release of OpenIndiana and there is some unclarity on whether it will work as PV guest
DomU support for Windows
Windows falls into the category of an unmodified operating system (in other words an operating system that has not been altered specifically to run on the Xen hypervisor). Thus, paravirtualization is not an option. The best way, therefore, to virtualize Windows is to use as a HVM) guest. The Windows 7/XP/Vista/Server 2008 section of the HowTos document points to instructions explaining how to do this.
However, James Harper maintains a set of PV drivers that allow Windows to make use of the network and block backend drivers in Dom0. This gives Windows on Xen a substantial performance boost. The table below shows the drivers available.
| Distribution | run as PV guest |
| Windows Vista | no |
| Windows XP | no |
| Windows 2008 | no |
| Windows 2003 | no |
| Windows 2000 | no |
| Windows 7 | no |
[6] GPLPV drivers can be downloaded from meadowcourt.org/downloads; further information can be found on XenWindowsGplPv
[7] Signed GPLPV drivers are available for download from Uninvention
