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author | 2017-06-28 13:50:05 -0600 | |
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committer | 2017-06-28 13:50:05 -0600 | |
commit | 5d6dee80a1e94cc284d03e06d930e60e8d3ecf7d (patch) | |
tree | 58129874a688c31b0c110e85b1af920fd8474018 /drivers/vfio | |
parent | kvm-vfio: Decouple only when we match a group (diff) | |
download | linux-5d6dee80a1e94cc284d03e06d930e60e8d3ecf7d.tar.gz linux-5d6dee80a1e94cc284d03e06d930e60e8d3ecf7d.tar.bz2 linux-5d6dee80a1e94cc284d03e06d930e60e8d3ecf7d.zip |
vfio: New external user group/file match
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>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/vfio')
-rw-r--r-- | drivers/vfio/vfio.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 54dd2fbf83d9..7597a377eb4e 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1776,6 +1776,15 @@ void vfio_group_put_external_user(struct vfio_group *group) } EXPORT_SYMBOL_GPL(vfio_group_put_external_user); +bool vfio_external_group_match_file(struct vfio_group *test_group, + struct file *filep) +{ + struct vfio_group *group = filep->private_data; + + return (filep->f_op == &vfio_group_fops) && (group == test_group); +} +EXPORT_SYMBOL_GPL(vfio_external_group_match_file); + int vfio_external_user_iommu_id(struct vfio_group *group) { return iommu_group_id(group->iommu_group); |