Why does dmidecode not working in Xen-Paravirtualized quests?

Issue

• Why does dmidecode not working in Xen-Paravirtualized guests.

[root@rhel5~]# dmidecode
# dmidecode 2.9
/dev/mem: mmap: Bad address

• It doesn't work on para-virtualized guest on Red Hat Enterprise Linux 6 as well.

[root@rhel6 ~]#  dmidecode 
# dmidecode 2.12
# No SMBIOS nor DMI entry point found, sorry.