vfio-ap devices do not pin any pages in the host. Therefore, they
are belived to be compatible with memory ballooning.
Flag them as compatible, so both vfio-ap and a balloon can be
used simultaneously.
Signed-off-by: Cornelia Huck <coh...@redhat.com>
---
As briefly discussed on IRC. RFC as I do not have easy access to
hardware I can test this with.
---
hw/vfio/ap.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index 65de952f44..3bf48eed28 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -104,6 +104,14 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
vapdev->vdev.name = g_strdup_printf("%s", mdevid);
vapdev->vdev.dev = dev;
+ /*
+ * vfio-ap devices are believed to operate in a way compatible with
+ * memory ballooning, as no pages are pinned in the host.
+ * This needs to be set before vfio_get_device() for vfio common to
+ * handle the balloon inhibitor.
+ */
+ vapdev->vdev.balloon_allowed = true;
+
ret = vfio_get_device(vfio_group, mdevid, &vapdev->vdev, &local_err);
if (ret) {
goto out_get_dev_err;
--
2.17.2
