Log Message:
Update xentools42 and xenkernel42 to Xen 4.2.5, fixing:
CVE-2014-2599 / XSA-89 HVMOP_set_mem_access is not preemptible
CVE-2014-3124 / XSA-92 HVMOP_set_mem_type allows invalid P2M entries to be
  created
CVE-2014-3967,CVE-2014-3968 / XSA-96 Vulnerabilities in HVM MSI injection
CVE-2014-4021 / XSA-100 Hypervisor heap contents leaked to guests

pkgsrc also includes patches from the Xen Security Advisory:
XSA-104 (CVE-2014-7154) - Race condition in HVMOP_track_dirty_vram
XSA-105 (CVE-2014-7155) - Missing privilege level checks in x86 HLT, LGDT,
  LIDT, and LMSW emulation
XSA-106 (CVE-2014-7156) - Missing privilege level checks in x86 emulation
  of software interrupts