This feature flag allows the driver enabling virtqueues both before and
after DRIVER_OK.
This is needed for software assisted live migration, so userland can
restore the device status in devices with control virtqueue before the
dataplane is enabled.
Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
Acked-by: Shannon Nelson <shannon.nelson@xxxxxxx>
---
include/uapi/linux/vhost_types.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h
index c5690a8992d8..4889e6d70b15 100644
--- a/include/uapi/linux/vhost_types.h
+++ b/include/uapi/linux/vhost_types.h
@@ -165,5 +165,9 @@ struct vhost_vdpa_iova_range {
#define VHOST_BACKEND_F_SUSPEND 0x4
/* Device can be resumed */
#define VHOST_BACKEND_F_RESUME 0x5
+/* Device supports the driver enabling virtqueues both before and after
+ * DRIVER_OK
+ */
+#define VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK 0x6
#endif
--
2.31.1
