'make install in the kernel tree'

def install(self, tag='', prefix='/', extraversion='autotest'):

    self.log('Installing    ...')
    os.chdir(self.build_dir)
    if (not os.path.isdir(prefix)):
        os.mkdir(prefix)
    self.boot_dir = os.path.join(prefix, 'boot')
    if (not os.path.isdir(self.boot_dir)):
        os.mkdir(self.boot_dir)
    xen_version = ('%s-%s' % (self.get_xen_build_ver(), extraversion))
    self.xen_image = (((self.boot_dir + '/xen-') + xen_version) + '.gz')
    self.xen_syms = ((self.boot_dir + '/xen-syms-') + xen_version)
    self.log('Installing    Xen    ...')
    os.environ['XEN_EXTRAVERSION'] = ('-unstable-%s' % extraversion)
    utils.system(('make    DESTDIR=%s    -C    xen    install' % prefix))
    utils.system(('make    DESTDIR=%s    -C    tools    install' % prefix))
    ktag = self.kjob.get_kernel_build_ver()
    kprefix = prefix
    self.kjob.install(tag=ktag, prefix=kprefix)
