Just posted an update to both kernel-xen and the xen packages.
* Sun Aug 14 2011 Michael Young
- 4.1.1-3 - untrusted guest controlling PCI[E] device can lock up host CPU [CVE-2011-3131]
* Fri Aug 19 2011 Steven Haigh
! Note: USB-DVB still seems to be broken. - commit 'v220.127.116.11': - Linux 18.104.22.168 - powerpc: pseries: Fix kexec on machines with more than 4TB of RAM - powerpc: Fix device tree claim code - ALSA: snd-usb-caiaq: Fix keymap for RigKontrol3 - ALSA: timer - Fix Oops at closing slave timer - net: Compute protocol sequence numbers and fragment IDs using MD5. - crypto: Move md5_transform to lib/md5.c
Details on how to use these packages and set up a repository are available on the EL6 and Xen howto guide.