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authorAlex Williamson <alex.williamson@redhat.com>2017-06-28 22:50:05 +0300
committerAlex Williamson <alex.williamson@redhat.com>2017-06-28 22:50:05 +0300
commit5d6dee80a1e94cc284d03e06d930e60e8d3ecf7d (patch)
tree58129874a688c31b0c110e85b1af920fd8474018 /include/linux/vfio.h
parente323369b2e204da4dc771bbddceef986f4bf85d5 (diff)
downloadlinux-5d6dee80a1e94cc284d03e06d930e60e8d3ecf7d.tar.xz
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 'include/linux/vfio.h')
-rw-r--r--include/linux/vfio.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index edf9b2cad277..9b34d0af5d27 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -97,6 +97,8 @@ 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);