Print out error messages when virgl fence creation fails to aid debugging
of the fence-related bugs.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-virgl.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index eedae7357f1a..b32ce44ba2b1 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -892,6 +892,7 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
                                       struct virtio_gpu_ctrl_command *cmd)
 {
     bool cmd_suspended = false;
+    int ret;
 
     VIRTIO_GPU_FILL_CMD(cmd->cmd_hdr);
 
@@ -990,7 +991,12 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
     }
 
     trace_virtio_gpu_fence_ctrl(cmd->cmd_hdr.fence_id, cmd->cmd_hdr.type);
-    virgl_renderer_create_fence(cmd->cmd_hdr.fence_id, cmd->cmd_hdr.type);
+
+    ret = virgl_renderer_create_fence(cmd->cmd_hdr.fence_id, 0);
+    if (ret)
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: virgl_renderer_create_fence error: %s",
+                      __func__, strerror(-ret));
 }
 
 static void virgl_write_fence(void *opaque, uint32_t fence)
-- 
2.46.0