1 files changed, 9 insertions, 0 deletions
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 351b305e1a..e96bbdc78b 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -349,6 +349,15 @@ static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
         }
     }
 
+    /*
+     * All vfio-ccw devices are believed to operate in a way compatible with
+     * memory ballooning, ie. pages pinned in the host are in the current
+     * working set of the guest driver and therefore never overlap with pages
+     * available to the guest balloon driver.  This needs to be set before
+     * vfio_get_device() for vfio common to handle the balloon inhibitor.
+     */
+    vcdev->vdev.balloon_allowed = true;
+
     if (vfio_get_device(group, vcdev->cdev.mdevid, &vcdev->vdev, errp)) {
         goto out_err;
     }