vfio: Support non-mmappable regions
In some cases device regions don't support mmap. They can still be made
available to the guest by trapping all accesses and forwarding reads or
writes to VFIO. Such regions may be:
* PCI I/O port BARs.
* Sub-page regions, for example a 4kB region on a host with 64k pages.
* Similarly, sparse mmap regions. For example when VFIO allows to mmap
fragments of a PCI BAR and forbids accessing things like MSI-X tables.
We don't support the sparse capability at the moment, so trap these
regions instead (if VFIO rejects the mmap).
Reviewed-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
3 files changed
