Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio,vhost,pc: fixes and updates

balloon fixes wrt migration
virtio-vsock device support

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Fri 09 Sep 2016 22:36:13 BST
# gpg:                using RSA key 0x281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>"
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* remotes/mst/tags/for_upstream:
  vhost-vsock: add virtio sockets device
  tests/acpi: speedup acpi tests
  virtio-pci: minor refactoring
  vhost: don't set vring call if no vector
  virtio-pci: error out when both legacy and modern modes are disabled
  virtio-balloon: fix stats vq migration
  virtio: add virtqueue_rewind()
  virtio-balloon: discard virtqueue element on reset
  virtio: zero vq->inuse in virtio_reset()
  virtio-pci: reduce modern_mem_bar size
  target-i386: present virtual L3 cache info for vcpus
  pc: Add 2.8 machine
  virtio-pci: use size from correct structure
  virtio: Tell the user what went wrong when event_notifier_init failed

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