Merge tag 'vfio-v7.1-rc4' of https://github.com/awilliam/linux-vfio

Pull VFIO fixes from Alex Williamson:

 - Convert vfio-pci BAR resource requests and iomaps initialization
   from a lazy, on-demand model to an eager pre-allocation model to
   avoid races while preserving legacy error behavior.  Fix unchecked
   barmap access in dma-buf export path (Matt Evans)

 - Introduce an implicit unsigned cast in converting vfio-pci device
   offsets to region indexes, closing a potential out-of-bounds
   access through the vfio_pci_ioeventfd() interface (Matt Evans)

 - Fix a dma-buf kref underflow and stuck wait_for_completion() when
   closing a previously revoked dma-buf (Alex Williamson)

* tag 'vfio-v7.1-rc4' of https://github.com/awilliam/linux-vfio:
  vfio/pci: Check BAR resources before exporting a DMABUF
  vfio/pci: Set up BAR resources and maps in vfio_pci_core_enable()
  vfio/pci: Make VFIO_PCI_OFFSET_TO_INDEX() return unsigned
  vfio/pci: fix dma-buf kref underflow after revoke

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