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misc: Reserve minor for VFIO
VFIO currently allocates it's own dynamic chardev range, reserving the
first minor for the control part of the interface (/dev/vfio/vfio) and
the remainder for VFIO groups (/dev/vfio/$GROUP). This works, but it
doesn't support auto loading. For instance when libvirt checks for
VFIO support it looks for /dev/vfio/vfio, which currently doesn't
exist unless the vfio module is loaded. By converting the control
device to a misc driver and reserving a static minor, we can enable
auto loading.
Reserving the minor is a prerequist to that conversion. Minor 196
is unused by anything currently in the kernel.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>