Merge remote-tracking branch 'remotes/kraxel/tags/vga-20210723-pull-request' into staging

vga: fixes for qxl and virtio-gpu

# gpg: Signature made Fri 23 Jul 2021 06:54:34 BST
# gpg:                using RSA key A0328CFFB93A17A79901FE7D4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full]
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>" [full]
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full]
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/vga-20210723-pull-request:
  hw/display: fix virgl reset regression
  vl: add virtio-vga-gl to the default_list
  hw/display: fail early when multiple virgl devices are requested
  Revert "qxl: add migration blocker to avoid pre-save assert"
  qxl: remove assert in qxl_pre_save.
  hw/display/virtio-gpu: Fix memory leak (CID 1453811)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 16 insertions, 11 deletions

diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c
index 7ab93bf8c8..6cc4313b1a 100644
--- a/hw/display/virtio-gpu-gl.c
+++ b/hw/display/virtio-gpu-gl.c
@@ -51,12 +51,7 @@ static void virtio_gpu_gl_update_cursor_data(VirtIOGPU *g,
 static void virtio_gpu_gl_flushed(VirtIOGPUBase *b)
 {
     VirtIOGPU *g = VIRTIO_GPU(b);
-    VirtIOGPUGL *gl = VIRTIO_GPU_GL(b);
 
-    if (gl->renderer_reset) {
-        gl->renderer_reset = false;
-        virtio_gpu_virgl_reset(g);
-    }
     virtio_gpu_process_cmdq(g);
 }
 
@@ -74,6 +69,10 @@ static void virtio_gpu_gl_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
         virtio_gpu_virgl_init(g);
         gl->renderer_inited = true;
     }
+    if (gl->renderer_reset) {
+        gl->renderer_reset = false;
+        virtio_gpu_virgl_reset(g);
+    }
 
     cmd = virtqueue_pop(vq, sizeof(struct virtio_gpu_ctrl_command));
     while (cmd) {
@@ -95,12 +94,13 @@ static void virtio_gpu_gl_reset(VirtIODevice *vdev)
 
     virtio_gpu_reset(vdev);
 
-    if (gl->renderer_inited) {
-        if (g->parent_obj.renderer_blocked) {
-            gl->renderer_reset = true;
-        } else {
-            virtio_gpu_virgl_reset(g);
-        }
+    /*
+     * GL functions must be called with the associated GL context in main
+     * thread, and when the renderer is unblocked.
+     */
+    if (gl->renderer_inited && !gl->renderer_reset) {
+        virtio_gpu_virgl_reset_scanout(g);
+        gl->renderer_reset = true;
     }
 }
 
@@ -113,6 +113,11 @@ static void virtio_gpu_gl_device_realize(DeviceState *qdev, Error **errp)
     return;
 #endif
 
+    if (!object_resolve_path_type("", TYPE_VIRTIO_GPU_GL, NULL)) {
+        error_setg(errp, "at most one %s device is permitted", TYPE_VIRTIO_GPU_GL);
+        return;
+    }
+
     if (!display_opengl) {
         error_setg(errp, "opengl is not available");
         return;