Security update for xen (important)

This update for xen fixes the following issues:

Update to Xen 4.10.2 bug fix release (bsc#1027519).

Security vulnerabilities fixed:

• CVE-2018-19961, CVE-2018-19962: Fixed an issue related to insufficient
  TLB flushing with AMD IOMMUs, which potentially allowed a guest to
  escalate its privileges, may cause a Denial of Service (DoS) affecting
  the entire host, or may be able to access data it is not supposed to
  access. (XSA-275) (bsc#1115040)
• CVE-2018-19965: Fixed an issue related to the INVPCID instruction in
  case non-canonical addresses are accessed, which may allow a guest to
  cause Xen to crash, resulting in a Denial of Service (DoS) affecting the
  entire host. (XSA-279) (bsc#1115045)
• CVE-2018-19966: Fixed an issue related to a previous fix for XSA-240,
  which conflicted with shadow paging and allowed a guest to cause Xen to
  crash, resulting in a Denial of Service (DoS). (XSA-280) (bsc#1115047)
• CVE-2018-18883: Fixed an issue related to inproper restriction of nested
  VT-x, which allowed a guest to cause Xen to crash, resulting in a Denial
  of Service (DoS). (XSA-278) (bsc#1114405)
• CVE-2018-15468: Fixed incorrect MSR_DEBUGCTL handling, which allowed
  guests to enable Branch Trace Store and may cause a Denial of Service
  (DoS) of the entire host. (XSA-269) (bsc#1103276)
• CVE-2018-15469: Fixed use of v2 grant tables on ARM, which were not
  properly implemented and may cause a Denial of Service (DoS). (XSA-268)
  (bsc#1103275)
• CVE-2018-15470: Fixed an issue in the logic in oxenstored for handling
  writes, which allowed a guest to write memory unbounded leading to
  system-wide Denial
  of Service (DoS). (XSA-272) (bsc#1103279)
• CVE-2018-3646: Mitigations for VMM aspects of L1 Terminal Fault
  (XSA-273) (bsc#1091107)

Other bugs fixed:

• Fixed an issue related to a domU hang on SLE12-SP3 HV (bsc#1108940)
• Fixed an issue with xpti=no-dom0 not working as expected (bsc#1105528)
• Fixed a kernel oops related to fs/dcache.c called by
  d_materialise_unique() (bsc#1094508)

This update was imported from the SUSE:SLE-15:Update update project.