Merge commit '9ed7b059ef776a3921cfd085e891f45076922542' into upstream-merge

Merge commit '9ed7b059ef776a3921cfd085e891f45076922542' into upstream-merge

* commit '9ed7b059ef776a3921cfd085e891f45076922542': (40 commits)
  virtio-serial: Implement flow control for individual ports
  virtio-serial: Discard data that guest sends us when ports aren't connected
  virtio-serial: Apps should consume all data that guest sends out / Fix virtio api abuse
  virtio-serial: Handle scatter/gather input from the guest
  virtio-serial: Handle scatter-gather buffers for control messages
  iov: Add iov_to_buf and iov_size helpers
  iov: Introduce a new file for helpers around iovs, add iov_from_buf()
  virtio-serial: Send out guest data to ports only if port is opened
  virtio-serial: Propagate errors in initialising ports / devices in guest
  virtio-serial: Update copyright year to 2010
  virtio-serial: Remove redundant check for 0-sized write request
  virtio-serial: whitespace: match surrounding code
  virtio-serial: Use control messages to notify guest of new ports
  virtio-serial: save/load: Send target host connection status if different
  virtio-serial: save/load: Ensure we have hot-plugged ports instantiated
  virtio-serial: save/load: Ensure nr_ports on src and dest are same.
  virtio-serial: save/load: Ensure target has enough ports
  microblaze: fix custom fprintf
  Implement cpu_get_real_ticks for Alpha.
  target-alpha: Implement RPCC.
  ...

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>