Merge tag 'pull-vfio-20250626' of https://github.com/legoater/qemu into staging

vfio queue:

* Added several small fixes and cleanups
* Added support for vfio-user client device

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* tag 'pull-vfio-20250626' of https://github.com/legoater/qemu: (25 commits)
  vfio-user: introduce vfio-user protocol specification
  docs: add vfio-user documentation
  vfio-user: add coalesced posted writes
  vfio-user: support posted writes
  vfio-user: add 'x-msg-timeout' option
  vfio-user: implement VFIO_USER_DMA_READ/WRITE
  vfio-user: implement VFIO_USER_DMA_MAP/UNMAP
  vfio-user: implement VFIO_USER_DEVICE_RESET
  vfio-user: set up container access to the proxy
  vfio-user: forward MSI-X PBA BAR accesses to server
  vfio-user: implement VFIO_USER_DEVICE_GET/SET_IRQ*
  vfio-user: set up PCI in vfio_user_pci_realize()
  vfio-user: implement VFIO_USER_REGION_READ/WRITE
  vfio-user: implement VFIO_USER_DEVICE_GET_REGION_INFO
  vfio-user: implement VFIO_USER_DEVICE_GET_INFO
  vfio-user: implement message send infrastructure
  vfio-user: implement message receive infrastructure
  vfio-user: connect vfio proxy to remote server
  vfio-user: add vfio-user class and container
  vfio/container: fails mdev hotplug if add migration blocker failed
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --cc MAINTAINERS
Simple merge