Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20180702' into staging

s390x updates:
- add bpb/ppa15 features to default cpu model for z196 and later
- rework TOD handling and fix cpu hotplug under tcg
- various fixes

# gpg: Signature made Mon 02 Jul 2018 12:09:40 BST
# gpg:                using RSA key DECF6B93C6F02FAF
# gpg: Good signature from "Cornelia Huck <conny@cornelia-huck.de>"
# gpg:                 aka "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>"
# gpg:                 aka "Cornelia Huck <cohuck@kernel.org>"
# gpg:                 aka "Cornelia Huck <cohuck@redhat.com>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20180702:
  s390x/tcg: fix locking problem with tcg_s390_tod_updated
  s390x/kvm: indicate alignment in legacy_s390_alloc()
  s390x/kvm: legacy_s390_alloc() only supports one allocation
  s390x/tcg: fix CPU hotplug with single-threaded TCG
  s390x/tcg: rearm the CKC timer during migration
  s390x/tcg: implement SET CLOCK
  s390x/tcg: SET CLOCK COMPARATOR can clear CKC interrupts
  s390x/tcg: properly implement the TOD
  s390x/tcg: drop tod_basetime
  s390x/tod: factor out TOD into separate device
  s390x/kvm: pass values instead of pointers to kvm_s390_set_clock_*()
  s390x/tcg: avoid overflows in time2tod/tod2time
  s390x/cpumodel: default enable bpb and ppa15 for z196 and later
  loader: Check access size when calling rom_ptr() to avoid crashes
  s390/ipl: fix ipl with -no-reboot

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>