Security update for xen (important)

xen was updated to fix nine security issues.

These security issues were fixed:

• Guest affectable page reference leak in MMU_MACHPHYS_UPDATE handling
  (CVE-2014-9030).
• Insufficient bounding of "REP MOVS" to MMIO emulated inside the
  hypervisor (CVE-2014-8867).
• Excessive checking in compatibility mode hypercall argument translation
  (CVE-2014-8866).
• Guest user mode triggerable VM exits not handled by hypervisor
  (bnc#9038500).
• Missing privilege level checks in x86 emulation of far branches
  (CVE-2014-8595).
• Insufficient restrictions on certain MMU update hypercalls
  (CVE-2014-8594).
• Long latency virtual-mmu operations are not preemptible (CVE-2014-5146,
  CVE-2014-5149).
• Intel VT-d Interrupt Remapping engines can be evaded by native NMI
  interrupts (CVE-2013-3495).

These non-security issues were fixed:

• Corrupted save/restore test leaves orphaned data in xenstore
  (bnc#903357).
• Temporary migration name is not cleaned up after migration (bnc#903359).
• Xen save/restore of HVM guests cuts off disk and networking
  (bnc#866902).
• increase limit domUloader to 32MB (bnc#901317).
• XEN Host crashes when assigning non-VF device (SR-IOV) to guest
  (bnc#898772).
• Windows 2012 R2 fails to boot up with greater than 60 vcpus (bnc#882089).
• Restrict requires on grub2-x86_64-xen to x86_64 hosts
• Change default dump directory (bsc#900292).
• Update xen2libvirt.py to better detect and handle file formats
• libxc: check return values on mmap() and madvise() on
  xc_alloc_hypercall_buffer() (bnc#897906).
• Bug xen-tools uninstallable; grub2-x86_64-xen dependency not available
  (bnc#897614).
• Adjust xentop column layout (bnc#896023).