Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20170725' into staging

Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20170725' into staging

Various changes for the s390x code:
- updates for cpu model handling
- fix compilation with --disable-tcg
- fixes in vfio-ccw and I/O instruction handling

# gpg: Signature made Tue 25 Jul 2017 10:15:37 BST
# gpg:                using RSA key 0xDECF6B93C6F02FAF
# 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>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20170725:
  s390x/css: fix ilen in IO instruction handlers
  target/s390x: Add remaining switches to compile with --disable-tcg
  target/s390x: Move exception-related functions to a new excp_helper.c file
  target/s390x: Rework program_interrupt() and related functions
  target/s390x: Move diag helpers to a separate file
  target/s390x: Move s390_cpu_dump_state() to helper.c
  target/s390x: improve baselining if certain base features are missing
  s390x/kvm: better comment regarding zPCI feature availability
  target/s390x: introduce (test|set)_be_bit
  target/s390x: indicate query subfunction in s390_fill_feat_block
  target/s390x: drop BE_BIT()
  s390/cpumodel: remove KSS from the default model of z14
  vfio/ccw: fix initialization of the Object DeviceState pointer in the common base-device
  vfio/ccw: allocate irq info with the right size

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