def get_cpu_props(cls, family, arch='x86'):
        """
        Get CPU info XML

        Args:
            family(str): CPU family
            arch(str): CPU arch

        Returns:
            lxml.etree.Element: CPU xml

        Raises:
            :exc:`~LagoException`: If no such CPU family exists
        """

        cpus = cls.get_cpus_by_arch(arch)
        try:
            return cpus.xpath('model[@name="{0}"]'.format(family))[0]
        except IndexError:
            raise LagoException('No such CPU family: {0}'.format(family))