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

pc,virtio,pci: bug fixes

Fixes all over the place. Specifically this fixes
a bug which made windows guests lose device config
(such as the configured fixed IP) after upgrading
to the new QEMU.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Tue 02 Mar 2021 14:19:51 GMT
# 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:
  vhost: simplify vhost_dev_init() fail_busyloop label
  hw/pci: Have safer pcie_bus_realize() by checking error path
  virtio-net: handle zero mac for a vdpa peer
  i386/acpi: restore device paths for pre-5.1 vms

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