xen-ioemu-3.1 3.1.0-0ubuntu18 (amd64 binary) in ubuntu gutsy

 The userspace tools to manage a system virtualized through the XEN virtual
 machine monitor.
 .
 This package includes the utilities required to support HVM domains, which
 allows full virtualization of unmodified operating systems, such as
 Microsoft's Windows product line, and standard Linux kernels.
 .
 For this to work, you will need a CPU with hardware virtualization support,
 such as Intel's CPUs with VT, or AMD's CPUs with Pacifica.