Merge remote-tracking branch 'remotes/borntraeger/tags/s390x-20150218' into staging

Features for s390x/kvm

1. guest reIPL changes (Fan Zhang)
Implements subcode 5 and 6 of diag 0x308. This allows to use
/sys/firmware/[re]ipl/ccw/* and the chreipl and lsreipl tools in
Linux. In addition to the normal "change the disk" this also
allows to switch from booting an external kernel into rebooting
from a disk.

2. Memory page table walking (Thomas Huth)
Fix several page table walking functions, used in several places
like gdb server and instruction handling. Also use these functions
in several I/O related functions.

# gpg: Signature made Wed Feb 18 09:13:22 2015 GMT using RSA key ID B5A61C7C
# gpg: Good signature from "Christian Borntraeger (IBM) <borntraeger@de.ibm.com>"

* remotes/borntraeger/tags/s390x-20150218: (29 commits)
  s390x/helper: Remove s390_cpu_physical_memory_map
  s390x/pci: Rework memory access in zpci instruction
  s390x/ioinst: Rework memory access in TPI instruction
  s390x/ioinst: Rework memory access in CHSC instruction
  s390x/ioinst: Rework memory access in STCRW instruction
  s390x/ioinst: Rework memory access in TSCH instruction
  s390x/ioinst: Set condition code in ioinst_handle_tsch() handler
  s390x/ioinst: Rework memory access in STSCH instruction
  s390x/ioinst: Rework memory access in SSCH instruction
  s390x/ioinst: Rework memory access in MSCH instruction
  s390x/css: Make schib parameter of css_do_msch const
  s390x/mmu: Add function for accessing guest memory
  s390x/kvm: Add function for injecting pgm access exceptions
  s390x/mmu: Clean up mmu_translate_asc()
  s390x/mmu: Check bit 52 in page table entry
  s390x/mmu: Renaming related to the ASCE confusion
  s390x/mmu: Add support for read-only regions
  s390x/mmu: Fix the exception codes for illegal table entries
  s390x/mmu: Fix exception types when checking the ASCEs
  s390x/mmu: Fix translation exception code in lowcore
  ...

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

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