Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20180122' into staging

Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20180122' into staging

Various fixes/improvements, and support for the new 81/82
facility bits.

# gpg: Signature made Mon 22 Jan 2018 11:54:46 GMT
# 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>"
# gpg:                 aka "Cornelia Huck <cohuck@redhat.com>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20180122:
  s390x/kvm: provide stfle.81
  s390x/kvm: Handle bpb feature
  linux-headers: update
  s390x/tcg: fixup TEST PROTECTION
  s390x: fix storage attributes migration for non-small guests
  hw/s390x: Replace fprintf(stderr, "*\n" with qemu_log_mask()
  s390x/sclp: fix missing be conversion
  s390x/tcg: implement TEST PROTECTION
  s390x/sclp: fixup highest CPU address

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