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author | Alex Williamson <alex.williamson@redhat.com> | 2017-06-28 13:50:05 -0600 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-27 15:03:27 -0700 |
commit | 0c20006ee2e3c18b87f781b51104275599fa2f8e (patch) | |
tree | 845f0136d81a9b8d75c248a0098795c996027efc /include/linux | |
parent | 282dbc1edf9231589e9bec4583ed12c30cded032 (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/linux')
-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 225d0dbfaddf..4db76b31c43c 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -81,6 +81,8 @@ 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); |