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| author |   Yan Zhao <yan.y.zhao@intel.com> | 2020-03-24 09:27:56 -0600 |
|---|---|---|
| committer |   Alex Williamson <alex.williamson@redhat.com> | 2020-03-24 09:27:56 -0600 |
| commit | c0560f51cf77472f4ed113539b0a02ca6cda7961 (patch) | |
| tree | f738f84f02f8dbc0c43d1a4312e8f5f38a228b9a /include/linux/vfio.h | |
| parent | Linux 5.6-rc7 (diff) | |
| download | linux-dev-c0560f51cf77472f4ed113539b0a02ca6cda7961.tar.xz linux-dev-c0560f51cf77472f4ed113539b0a02ca6cda7961.zip | |
vfio: allow external user to get vfio group from device
external user calls vfio_group_get_external_user_from_dev() with a device
pointer to get the VFIO group associated with this device.
The VFIO group is checked to be vialbe and have IOMMU set. Then
container user counter is increased and VFIO group reference is hold
to prevent the VFIO group from disposal before external user exits.
when the external user finishes using of the VFIO group, it calls
vfio_group_put_external_user() to dereference the VFIO group and the
container user counter.
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'include/linux/vfio.h')
| -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 e42a711a2800..fb71e0ac0e76 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -94,6 +94,8 @@ 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 struct vfio_group *vfio_group_get_external_user_from_dev(struct device + *dev); 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); |