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

pc, pci, virtio: features, fixes, cleanups

A bunch of fixes, cleanus and new features all over the place.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Thu 18 Jan 2018 20:41:03 GMT
# 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: (29 commits)
  vhost: remove assertion to prevent crash
  vhost-user: fix misaligned access to payload
  vhost-user: factor out msg head and payload
  tests: acpi: add comments to fetch_rsdt_referenced_tables/data->tables usage
  tests: acpi: rename test_acpi_tables()/test_dst_table() to reflect its usage
  tests: acpi: init table descriptor in test_dst_table()
  tests: acpi: move tested tables array allocation outside of test_acpi_dsdt_table()
  x86_iommu: check if machine has PCI bus
  x86_iommu: Move machine check to x86_iommu_realize()
  vhost-user-test: use init_virtio_dev in multiqueue test
  vhost-user-test: make features mask an init_virtio_dev() argument
  vhost-user-test: setup virtqueues in all tests
  vhost-user-test: extract read-guest-mem test from main loop
  vhost-user-test: fix features mask
  hw/acpi-build: Make next_base easy to follow
  ACPI/unit-test: Add a testcase for RAM allocation in numa node
  hw/pci-bridge: fix QEMU crash because of pcie-root-port
  intel-iommu: Extend address width to 48 bits
  intel-iommu: Redefine macros to enable supporting 48 bit address width
  vhost-user: fix multiple queue specification
  ...

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