vfio: Wrap VFIO_DEVICE_GET_REGION_INFO

In preparation for supporting capability chains on regions, wrap
ioctl(VFIO_DEVICE_GET_REGION_INFO) so we don't duplicate the code for
each caller.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 607ec70be3..e20fc4f794 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -959,6 +959,24 @@ void vfio_put_base_device(VFIODevice *vbasedev)
     close(vbasedev->fd);
 }
 
+int vfio_get_region_info(VFIODevice *vbasedev, int index,
+                         struct vfio_region_info **info)
+{
+    size_t argsz = sizeof(struct vfio_region_info);
+
+    *info = g_malloc0(argsz);
+
+    (*info)->index = index;
+    (*info)->argsz = argsz;
+
+    if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) {
+        g_free(*info);
+        return -errno;
+    }
+
+    return 0;
+}
+
 static int vfio_container_do_ioctl(AddressSpace *as, int32_t groupid,
                                    int req, void *param)
 {