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

pci, pc, virtio: fixes

intel-iommu fixes
virtio typo fixes
linker: a couple of asserts for consistency/security

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Tue 02 Apr 2019 16:51:19 BST
# gpg:                using RSA key 281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [full]
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>" [full]
# 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:
  intel_iommu: Drop extended root field
  intel_iommu: Fix root_scalable migration breakage
  virtio-net: Fix typo in comment
  intel_iommu: Correct caching-mode error message
  acpi: verify file entries in bios_linker_loader_add_pointer()

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