diff options
| author | Alex Williamson <alex.williamson@redhat.com> | 2017-06-28 13:50:05 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-27 15:08:03 -0700 |
| commit | 8f9dec0c2dbb99aa36fa2d242828d853abde8eb0 (patch) | |
| tree | d6e23c8e9309cf50c4c8b40ecc77c4f742657ce8 /include | |
| parent | e91a55790ddfbda7f9f72963e561d9c738f14a52 (diff) | |
vfio: New external user group/file match
commit 5d6dee80a1e94cc284d03e06d930e60e8d3ecf7d upstream.
At the point where the kvm-vfio pseudo device wants to release its
vfio group reference, we can't always acquire a new reference to make
that happen. The group can be in a state where we wouldn't allow a
new reference to be added. This new helper function allows a caller
to match a file to a group to facilitate this. Given a file and
group, report if they match. Thus the caller needs to already have a
group reference to match to the file. This allows the deletion of a
group without acquiring a new reference.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/vfio.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 0ecae0b1cd34..ed466750e744 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -88,6 +88,8 @@ extern void vfio_unregister_iommu_driver( */ extern struct vfio_group *vfio_group_get_external_user(struct file *filep); extern void vfio_group_put_external_user(struct vfio_group *group); +extern bool vfio_external_group_match_file(struct vfio_group *group, + struct file *filep); extern int vfio_external_user_iommu_id(struct vfio_group *group); extern long vfio_external_check_extension(struct vfio_group *group, unsigned long arg); |