11 files changed, 48 insertions, 10 deletions

diff --git a/hw/display/vhost-user-gpu.c b/hw/display/vhost-user-gpu.c
index b7bde9feb6..4d8cb3525b 100644
--- a/hw/display/vhost-user-gpu.c
+++ b/hw/display/vhost-user-gpu.c
@@ -360,7 +360,7 @@ vhost_user_gpu_update_blocked(VhostUserGPU *g, bool blocked)
 }
 
 static void
-vhost_user_gpu_gl_unblock(VirtIOGPUBase *b)
+vhost_user_gpu_gl_flushed(VirtIOGPUBase *b)
 {
     VhostUserGPU *g = VHOST_USER_GPU(b);
 
@@ -578,7 +578,7 @@ vhost_user_gpu_class_init(ObjectClass *klass, void *data)
     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
     VirtIOGPUBaseClass *vgc = VIRTIO_GPU_BASE_CLASS(klass);
 
-    vgc->gl_unblock = vhost_user_gpu_gl_unblock;
+    vgc->gl_flushed = vhost_user_gpu_gl_flushed;
 
     vdc->realize = vhost_user_gpu_device_realize;
     vdc->reset = vhost_user_gpu_reset;
diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c
index f27a6fbe75..4a57350917 100644
--- a/hw/display/virtio-gpu-base.c
+++ b/hw/display/virtio-gpu-base.c
@@ -97,21 +97,27 @@ static int virtio_gpu_ui_info(void *opaque, uint32_t idx, QemuUIInfo *info)
 }
 
 static void
-virtio_gpu_gl_block(void *opaque, bool block)
+virtio_gpu_gl_flushed(void *opaque)
 {
     VirtIOGPUBase *g = opaque;
     VirtIOGPUBaseClass *vgc = VIRTIO_GPU_BASE_GET_CLASS(g);
 
+    if (vgc->gl_flushed) {
+        vgc->gl_flushed(g);
+    }
+}
+
+static void
+virtio_gpu_gl_block(void *opaque, bool block)
+{
+    VirtIOGPUBase *g = opaque;
+
     if (block) {
         g->renderer_blocked++;
     } else {
         g->renderer_blocked--;
     }
     assert(g->renderer_blocked >= 0);
-
-    if (g->renderer_blocked == 0) {
-        vgc->gl_unblock(g);
-    }
 }
 
 static int
@@ -138,6 +144,7 @@ static const GraphicHwOps virtio_gpu_ops = {
     .text_update = virtio_gpu_text_update,
     .ui_info = virtio_gpu_ui_info,
     .gl_block = virtio_gpu_gl_block,
+    .gl_flushed = virtio_gpu_gl_flushed,
 };
 
 bool
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 7eb4265a6d..2e4a9822b6 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -850,7 +850,7 @@ void virtio_gpu_process_cmdq(VirtIOGPU *g)
     g->processing_cmdq = false;
 }
 
-static void virtio_gpu_gl_unblock(VirtIOGPUBase *b)
+static void virtio_gpu_gl_flushed(VirtIOGPUBase *b)
 {
     VirtIOGPU *g = VIRTIO_GPU(b);
 
@@ -1257,7 +1257,7 @@ static void virtio_gpu_class_init(ObjectClass *klass, void *data)
     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
     VirtIOGPUBaseClass *vgc = VIRTIO_GPU_BASE_CLASS(klass);
 
-    vgc->gl_unblock = virtio_gpu_gl_unblock;
+    vgc->gl_flushed = virtio_gpu_gl_flushed;
     vdc->realize = virtio_gpu_device_realize;
     vdc->reset = virtio_gpu_reset;
     vdc->get_config = virtio_gpu_get_config;
diff --git a/hw/display/virtio-vga.c b/hw/display/virtio-vga.c
index b071909b68..d3c6404061 100644
--- a/hw/display/virtio-vga.c
+++ b/hw/display/virtio-vga.c
@@ -68,6 +68,16 @@ static void virtio_vga_base_gl_block(void *opaque, bool block)
     }
 }
 
+static void virtio_vga_base_gl_flushed(void *opaque)
+{
+    VirtIOVGABase *vvga = opaque;
+    VirtIOGPUBase *g = vvga->vgpu;
+
+    if (g->hw_ops->gl_flushed) {
+        g->hw_ops->gl_flushed(g);
+    }
+}
+
 static int virtio_vga_base_get_flags(void *opaque)
 {
     VirtIOVGABase *vvga = opaque;
@@ -83,6 +93,7 @@ static const GraphicHwOps virtio_vga_base_ops = {
     .text_update = virtio_vga_base_text_update,
     .ui_info = virtio_vga_base_ui_info,
     .gl_block = virtio_vga_base_gl_block,
+    .gl_flushed = virtio_vga_base_gl_flushed,
 };
 
 static const VMStateDescription vmstate_virtio_vga_base = {
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 0043268e90..fae149235c 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -121,7 +121,7 @@ struct VirtIOGPUBase {
 struct VirtIOGPUBaseClass {
     VirtioDeviceClass parent;
 
-    void (*gl_unblock)(VirtIOGPUBase *g);
+    void (*gl_flushed)(VirtIOGPUBase *g);
 };
 
 #define VIRTIO_GPU_BASE_PROPERTIES(_state, _conf)                       \
diff --git a/include/ui/console.h b/include/ui/console.h
index 875885d9c7..d30e972d0b 100644
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -387,6 +387,7 @@ typedef struct GraphicHwOps {
     void (*update_interval)(void *opaque, uint64_t interval);
     int (*ui_info)(void *opaque, uint32_t head, QemuUIInfo *info);
     void (*gl_block)(void *opaque, bool block);
+    void (*gl_flushed)(void *opaque);
 } GraphicHwOps;
 
 QemuConsole *graphic_console_init(DeviceState *dev, uint32_t head,
@@ -402,6 +403,7 @@ void graphic_hw_update_done(QemuConsole *con);
 void graphic_hw_invalidate(QemuConsole *con);
 void graphic_hw_text_update(QemuConsole *con, console_ch_t *chardata);
 void graphic_hw_gl_block(QemuConsole *con, bool block);
+void graphic_hw_gl_flushed(QemuConsole *con);
 
 void qemu_console_early_init(void);
 
diff --git a/ui/console.c b/ui/console.c
index d8cc640c28..c5d11bc701 100644
--- a/ui/console.c
+++ b/ui/console.c
@@ -294,6 +294,15 @@ void graphic_hw_gl_block(QemuConsole *con, bool block)
     }
 }
 
+void graphic_hw_gl_flushed(QemuConsole *con)
+{
+    assert(con != NULL);
+
+    if (con->hw_ops->gl_flushed) {
+        con->hw_ops->gl_flushed(con->hw);
+    }
+}
+
 int qemu_console_get_window_id(QemuConsole *con)
 {
     return con->window_id;
diff --git a/ui/gtk-egl.c b/ui/gtk-egl.c
index 71c3d698b4..588e7b1bb1 100644
--- a/ui/gtk-egl.c
+++ b/ui/gtk-egl.c
@@ -92,6 +92,9 @@ void gd_egl_draw(VirtualConsole *vc)
         vc->gfx.scale_x = (double)ww / surface_width(vc->gfx.ds);
         vc->gfx.scale_y = (double)wh / surface_height(vc->gfx.ds);
     }
+
+    glFlush();
+    graphic_hw_gl_flushed(vc->gfx.dcl.con);
 }
 
 void gd_egl_update(DisplayChangeListener *dcl,
diff --git a/ui/gtk-gl-area.c b/ui/gtk-gl-area.c
index 72bcd94918..e7ca73c7b1 100644
--- a/ui/gtk-gl-area.c
+++ b/ui/gtk-gl-area.c
@@ -70,6 +70,9 @@ void gd_gl_area_draw(VirtualConsole *vc)
         surface_gl_setup_viewport(vc->gfx.gls, vc->gfx.ds, ww, wh);
         surface_gl_render_texture(vc->gfx.gls, vc->gfx.ds);
     }
+
+    glFlush();
+    graphic_hw_gl_flushed(vc->gfx.dcl.con);
 }
 
 void gd_gl_area_update(DisplayChangeListener *dcl,
diff --git a/ui/sdl2-gl.c b/ui/sdl2-gl.c
index 82139ba49e..fd594d7461 100644
--- a/ui/sdl2-gl.c
+++ b/ui/sdl2-gl.c
@@ -58,6 +58,7 @@ static void sdl2_gl_render_surface(struct sdl2_console *scon)
 
     surface_gl_render_texture(scon->gls, scon->surface);
     SDL_GL_SwapWindow(scon->real_window);
+    graphic_hw_gl_flushed(scon->dcl.con);
 }
 
 void sdl2_gl_update(DisplayChangeListener *dcl,
@@ -240,4 +241,5 @@ void sdl2_gl_scanout_flush(DisplayChangeListener *dcl,
     egl_fb_blit(&scon->win_fb, &scon->guest_fb, !scon->y0_top);
 
     SDL_GL_SwapWindow(scon->real_window);
+    graphic_hw_gl_flushed(dcl->con);
 }
diff --git a/ui/spice-display.c b/ui/spice-display.c
index dccac4710a..6f32b66a6e 100644
--- a/ui/spice-display.c
+++ b/ui/spice-display.c
@@ -826,6 +826,7 @@ static void qemu_spice_gl_unblock_bh(void *opaque)
     SimpleSpiceDisplay *ssd = opaque;
 
     qemu_spice_gl_block(ssd, false);
+    graphic_hw_gl_flushed(ssd->dcl.con);
 }
 
 static void qemu_spice_gl_block_timer(void *opaque)