[root@xenhost1 ~]# xe vm-param-set uuid=c77040ae-3a50-9217-ff03-41992c34d1ec PV-args="_hostname=vm-template _ipaddr=192.168.1.121 _netmask=255.255.255.0 _gateway=192.168.1.1"

[root@vm-linux ~]# cat /proc/cmdline

ro root=/dev/mapper/vg_t-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 rd_LVM_LV=vg_t/lv_root crashkernel=129M@0M  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet  _hostname=vm-template _ipaddr=192.168.1.121 _netmask=255.255.255.0 _gateway=192.168.1.1