vfio: Define sparse mmap capability for regions

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We can't always support mmap across an entire device region, for
example we deny mmaps covering the MSI-X table of PCI devices, but
we don't really have a way to report it.  We expect the user to
implicitly know this restriction.  We also can't split the region
because vfio-pci defines an API with fixed region index to BAR
number mapping.  We therefore define a new capability which lists
areas within the region that may be mmap'd.  In addition to the
MSI-X case, this potentially enables in-kernel emulation and
extensions to devices.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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Alex Williamson 2016-02-22 16:02:35 -07:00

parent d7a8d5ed87

commit ff63eb638d

1 changed files with 25 additions and 1 deletions

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include/uapi/linux/vfio.h

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