diff options
| author | Jike Song <jike.song@intel.com> | 2016-12-01 13:20:05 +0800 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2016-12-01 09:38:47 -0700 |
| commit | 22195cbd3451a75abaf30651a61cf85c89061327 (patch) | |
| tree | 9178b97be1c3800c8832adabde709868e452a130 /drivers/vfio/vfio_iommu_type1.c | |
| parent | d256459fae4dba66d50850f2d948306503818913 (diff) | |
vfio: vfio_register_notifier: classify iommu notifier
Currently vfio_register_notifier assumes that there is only one
notifier chain, which is in vfio_iommu. However, the user might
also be interested in events other than vfio_iommu, for example,
vfio_group. Refactor vfio_{un}register_notifier implementation
to make it feasible.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Jike Song <jike.song@intel.com>
[aw: merge with commit 816ca69ea9c7 ("vfio: Fix handling of error returned by 'vfio_group_get_from_dev()'"), remove typedef]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio/vfio_iommu_type1.c')
| -rw-r--r-- | drivers/vfio/vfio_iommu_type1.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 51810a95416e..b88ad1e5e7ff 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -1584,10 +1584,18 @@ static long vfio_iommu_type1_ioctl(void *iommu_data, } static int vfio_iommu_type1_register_notifier(void *iommu_data, + unsigned long *events, struct notifier_block *nb) { struct vfio_iommu *iommu = iommu_data; + /* clear known events */ + *events &= ~VFIO_IOMMU_NOTIFY_DMA_UNMAP; + + /* refuse to register if still events remaining */ + if (*events) + return -EINVAL; + return blocking_notifier_chain_register(&iommu->notifier, nb); } |