[PATCH v2 1/2] vfio: report group noiommu status

Michael S. Tsirkin
2016-08-30T02:27:14Z

When using vfio, callers might want to know whether device is added
to a regular group or an non-iommu group.

Report this status from vfio_is_noiommu_group_dev.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
include/linux/vfio.h | 2 ++
drivers/vfio/vfio.c | 12 ++++++++++++
2 files changed, 14 insertions(+)

diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 0ecae0b..584757b 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -51,6 +51,8 @@ extern int vfio_add_group_dev(struct device *dev,
const struct vfio_device_ops *ops,
void *device_data);

+extern bool vfio_is_noiommu_group_dev(struct device *dev);
+
extern void *vfio_del_group_dev(struct device *dev);
extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
extern void vfio_device_put(struct vfio_device *device);
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index d1d70e0..22f279f 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -872,6 +872,18 @@ static bool vfio_dev_present(struct vfio_group *group, struct device *dev)
}

/*
+ * Is device part of a noiommu group?
+ * Note: must call vfio_add_group_dev first.
+ */
+bool vfio_is_noiommu_group_dev(struct device *dev)
+{
+ struct vfio_device *device = dev_get_drvdata(dev);
+ struct vfio_group *group = device->group;
+
+ return group->noiommu;
+}
+
+/*
* Decrement the device reference count and wait for the device to be
* removed. Open file descriptors for the device... */
void *vfio_del_group_dev(struct device *dev)
--
MST