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

virtio,pci: bugfixes

Minor bugfixes all over the places, including one CVE.

Additionally, a fix for an ancient bug in migration -
one has to wonder how come no one noticed.

The fix is also non-trivial since we dare not break all
existing machine types with pci - we have a work around
in the works, for now we just skip the work-around for
old machine types.

Great job by Hogan Wang noticing, debugging and fixing it,
and thanks to Dr. David Alan Gilbert for reviewing the patches.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Mon 27 Jul 2020 16:34:58 BST
# gpg:                using RSA key 5D09FD0871C8F85B94CA8A0D281F0DB8D28D5469
# gpg:                issuer "mst@redhat.com"
# 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:
  virtio-pci: fix virtio_pci_queue_enabled()
  MAINTAINERS: Cover the firmware JSON schema
  vhost-vdpa :Fix Coverity CID 1430270 / CID 1420267
  libvhost-user: Report descriptor index on panic
  Fix vhost-user buffer over-read on ram hot-unplug
  hw/pci-host: save/restore pci host config register
  virtio-mem-pci: force virtio version 1

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

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