virtio-gpu: Handle virtio_gpu_virgl_init() failure

virtio_gpu_virgl_init() may fail, leading to a further Qemu crash
because Qemu assumes it never fails. Check virtio_gpu_virgl_init()
return code and don't execute virtio commands on error. Failed
virtio_gpu_virgl_init() will result in a timed out virtio commands
for a guest OS.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Message-Id: <20241024210311.118220-5-dmitry.osipenko@collabora.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

1 files changed, 9 insertions, 2 deletions

diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 18b6c3b3a2..71775243e9 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -222,11 +222,18 @@ struct VirtIOGPUClass {
                              Error **errp);
 };
 
+/* VirtIOGPUGL renderer states */
+typedef enum {
+    RS_START,       /* starting state */
+    RS_INIT_FAILED, /* failed initialisation */
+    RS_INITED,      /* initialised and working */
+    RS_RESET,       /* inited and reset pending, moves to start after reset */
+} RenderState;
+
 struct VirtIOGPUGL {
     struct VirtIOGPU parent_obj;
 
-    bool renderer_inited;
-    bool renderer_reset;
+    RenderState renderer_state;
 
     QEMUTimer *fence_poll;
     QEMUTimer *print_stats;