Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20140520' into staging

some s390 patches:

- Enable irqfds on s390 via the new adapter interrupt routing type.
  As a prereq, fix the kvm enable_cap helpers for some compilers and
  split the s390 flic into kvm and non-kvm parts.
- Enable software and hardware debugging support on s390. This needs a
  kernel headers update.

# gpg: Signature made Tue 20 May 2014 12:30:54 BST using RSA key ID C6F02FAF
# gpg: Can't check signature: public key not found

* remotes/cohuck/tags/s390x-20140520:
  s390x/kvm: hw debugging support via guest PER facility
  s390x/kvm: software breakpoint support
  s390x: remove duplicate definitions of DIAG 501
  linux-headers: update
  s390x/virtio-ccw: wire up irq routing and irqfds
  s390x/virtio-ccw: reference-counted indicators
  s390x: add I/O adapter registration
  s390x: split flic into kvm and non-kvm parts
  kvm: Fix enable_cap helpers on older gcc

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