s390x/ipl: Fixes for ipl and bios

- provide a pointer to the loadparm. This fixes crashes in zipl
- do not throw away guest changes of the IPL parameter during reset
- refactor IPLB checks

- do not abuse memory_region_allocate_system_memory and split the memory

  according to KVM memslots in KVM code instead (Paolo, Igor)
- change splitting to split at 4TB (Christian)
- do not claim s390 (31bit) support in configure (Thomas)
- sclp error checking (Janosch, Claudio)
- new s390 pci maintainer (Matt, Collin)
- fix s390 pci (again) (Matt)

- bugfixes in ccw bios

- gen15a is called z15
- officially require a 3.15 kernel or later for kvm

s390x: Fixes for 2.12

- Fix for the s390 cpumodel
- Forbid multifunction PCI devices

s390x: fixups for 2.11

- missing \r in the BIOS console output
- CPU type name is now "s390x-cpu"
- fixup for the host-model on z14 and older machine versions

s390: add z14 cpu model

- add a CPU model for the IBM z14 which was announced on July 17th 2017
- update linux headers to 4.13-rc0 to get a fix for an ioctl definition

s390x/kvm/migration/cpumodel: fixes, enhancements and cleanups

- add a network boot rom for s390 (Thomas Huth)
- migration of storage attributes like the CMMA used/unused state
- PCI related enhancements - full support for aen, ais and zpci
- migration support for css with vmstates (Halil Pasic)
- cpu model enhancements for cpu features
- guarded storage support

s390x/kvm/migration: fixes, enhancements and cleanups

- new email address for Cornelia
- Fixes: 3270, flic, virtio-scsi-ccw, ipl
- Enhancements, cpumodel, migration

s390x: misc fixes

bunch of fixes
- reject MIDA accesses for CCWs
- cpumodel fixes
- cross-build fix for bios
- migration improvements

s390x fixes

- build error with old gcc versions
- race between cmma reset and rom/loader resets
- linux-user vs. cpu model