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 11 Jan 2018 20:04:57 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: (23 commits)
  smbus: do not immediately complete commands
  dump-guest-memory.py: fix "You can't do that without a process to debug"
  virtio-pci: Don't force Subsystem Vendor ID = Vendor ID
  intel_iommu: fix error param in string
  intel_iommu: remove X86_IOMMU_PCI_DEVFN_MAX
  vhost-user: document memory accesses
  vhost-user: fix indentation in protocol specification
  hw/pci-host/xilinx: QOM'ify the AXI-PCIe host bridge
  hw/pci-host/piix: QOM'ify the IGD Passthrough host bridge
  tests/pxe-test: Add some extra tests
  tests/pxe-test: Test net booting over IPv6 in some cases
  tests/pxe-test: Use table of testcases rather than open-coding
  tests/pxe-test: Remove unnecessary special case test functions
  virtio_error: don't invoke status callbacks
  pci: Eliminate pci_find_primary_bus()
  pci: Eliminate redundant PCIDevice::bus pointer
  pci: Add pci_dev_bus_num() helper
  pci: Move bridge data structures from pci_bus.h to pci_bridge.h
  pci: Rename root bus initialization functions for clarity
  tests: add test to check VirtQueue object
  ...

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