The virtio spec doesn't allow changing virtqueue state after
DRIVER_OK. Some devices do support this operation when the device is
suspended. The VHOST_BACKEND_F_CHANGEABLE_VQ_STATE_IN_SUSPEND flag
advertises this support as a backend features.
Signed-off-by: Dragos Tatulea <dtatulea@xxxxxxxxxx>
Suggested-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
---
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 aacd067afc89..848dadc95ca1 100644
--- a/include/uapi/linux/vhost_types.h
+++ b/include/uapi/linux/vhost_types.h
@@ -196,5 +196,9 @@ struct vhost_vdpa_iova_range {
* and is in state DRIVER_OK.
*/
#define VHOST_BACKEND_F_CHANGEABLE_VQ_ADDR_IN_SUSPEND 0x9
+/* Device supports changing virtqueue state when device is suspended
+ * and is in state DRIVER_OK.
+ */
+#define VHOST_BACKEND_F_CHANGEABLE_VQ_STATE_IN_SUSPEND 0x10
#endif
--
2.43.0
