vfio/pci: rename and export range_intersect_range

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range_intersect_range determines an overlap between two ranges. If an
overlap, the helper function returns the overlapping offset and size.

The VFIO PCI variant driver emulates the PCI config space BAR offset
registers. These offset may be accessed for read/write with a variety
of lengths including sub-word sizes from sub-word offsets. The driver
makes use of this helper function to read/write the targeted part of
the emulated register.

Make this a vfio_pci_core function, rename and export as GPL. Also
update references in virtio driver.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
Link: https://lore.kernel.org/r/20240220115055.23546-3-ankita@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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Ankit Agrawal 2024-02-20 17:20:54 +05:30 • committed by Alex Williamson

parent 4de676d494

commit 30e920e1de

3 changed files with 73 additions and 46 deletions

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42

drivers/vfio/pci/vfio_pci_config.c

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72

drivers/vfio/pci/virtio/main.c

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5

include/linux/vfio_pci_core.h

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