[kernel-xen] xen-pciback in 3.8.x

[povder]

System hangs when I try to load module probably because I have it
configured in a way that relies on xen-pciback built into kernel.

In 3.7.10 kernel config I can see CONFIG_XEN_PCIDEV_BACKEND=y but in
3.8.x there is CONFIG_XEN_PCIDEV_BACKEND=m. Was this change intended?
This change broke my system. Is there a possibility to change it back
to the way it was in 3.7.10?