1 files changed, 6 insertions, 0 deletions

diff --git a/lib/migration.c b/lib/migration.c
index 20d542c..aefd103 100644
--- a/lib/migration.c
+++ b/lib/migration.c
@@ -292,6 +292,7 @@ handle_mig_data_read(vfu_ctx_t *vfu_ctx, vfu_msg_t *msg)
     assert(msg != NULL);
 
     if (msg->in.iov.iov_len < sizeof(struct vfio_user_mig_data)) {
+        vfu_log(vfu_ctx, LOG_ERR, "message too short");
         return ERROR_INT(EINVAL);
     }
 
@@ -299,6 +300,7 @@ handle_mig_data_read(vfu_ctx_t *vfu_ctx, vfu_msg_t *msg)
     struct vfio_user_mig_data *req = msg->in.iov.iov_base;
 
     if (vfu_ctx->migration == NULL) {
+        vfu_log(vfu_ctx, LOG_ERR, "migration not enabled");
         return ERROR_INT(EINVAL);
     }
 
@@ -333,6 +335,7 @@ handle_mig_data_read(vfu_ctx_t *vfu_ctx, vfu_msg_t *msg)
     ssize_t ret = migr->callbacks.read_data(vfu_ctx, &res->data, req->size);
 
     if (ret < 0) {
+        vfu_log(vfu_ctx, LOG_ERR, "read_data callback failed");
         msg->out.iov.iov_len = 0;
         return ret;
     }
@@ -350,6 +353,7 @@ handle_mig_data_write(vfu_ctx_t *vfu_ctx, vfu_msg_t *msg)
     assert(msg != NULL);
 
     if (msg->in.iov.iov_len < sizeof(struct vfio_user_mig_data)) {
+        vfu_log(vfu_ctx, LOG_ERR, "message too short");
         return ERROR_INT(EINVAL);
     }
 
@@ -357,6 +361,7 @@ handle_mig_data_write(vfu_ctx_t *vfu_ctx, vfu_msg_t *msg)
     struct vfio_user_mig_data *req = msg->in.iov.iov_base;
 
     if (vfu_ctx->migration == NULL) {
+        vfu_log(vfu_ctx, LOG_ERR, "migration not enabled");
         return ERROR_INT(EINVAL);
     }
 
@@ -381,6 +386,7 @@ handle_mig_data_write(vfu_ctx_t *vfu_ctx, vfu_msg_t *msg)
     ssize_t ret = migr->callbacks.write_data(vfu_ctx, &req->data, req->size);
 
     if (ret < 0) {
+        vfu_log(vfu_ctx, LOG_ERR, "write_data callback failed");
         return ret;
     } else if (ret != req->size) {
         vfu_log(vfu_ctx, LOG_ERR, "migration data partial write");