From 8a13b9bc0f283caff4333c75bc396a963f47ce5c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Date: Fri, 2 Jul 2021 16:32:21 +0400 Subject: [PATCH] hw/display: fix virgl reset regression MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Before commit 49afbca3b00e8e517d54964229a794b51768deaf ("virtio-gpu: drop use_virgl_renderer"), use_virgl_renderer was preventing calling GL functions from non-GL context threads. The innocuously looking g->parent_obj.use_virgl_renderer = false; was set the first time virtio_gpu_gl_reset() was called, during pc_machine_reset() in the main thread. Further virtio_gpu_gl_reset() calls in IO threads, without associated GL context, were thus skipping GL calls and avoided warnings or crashes (see also https://gitlab.freedesktop.org/virgl/virglrenderer/-/issues/226). Signed-off-by: Marc-André Lureau Message-Id: <20210702123221.942432-1-marcandre.lureau@redhat.com> Signed-off-by: Gerd Hoffmann --- hw/display/virtio-gpu-gl.c | 22 +++++++++++----------- hw/display/virtio-gpu-virgl.c | 8 ++++++-- include/hw/virtio/virtio-gpu.h | 1 + 3 files changed, 18 insertions(+), 13 deletions(-) diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c index b1035e119c..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; } } diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c index 092c6dc380..18d054922f 100644 --- a/hw/display/virtio-gpu-virgl.c +++ b/hw/display/virtio-gpu-virgl.c @@ -588,17 +588,21 @@ void virtio_gpu_virgl_fence_poll(VirtIOGPU *g) virtio_gpu_fence_poll(g); } -void virtio_gpu_virgl_reset(VirtIOGPU *g) +void virtio_gpu_virgl_reset_scanout(VirtIOGPU *g) { int i; - virgl_renderer_reset(); for (i = 0; i < g->parent_obj.conf.max_outputs; i++) { dpy_gfx_replace_surface(g->parent_obj.scanout[i].con, NULL); dpy_gl_scanout_disable(g->parent_obj.scanout[i].con); } } +void virtio_gpu_virgl_reset(VirtIOGPU *g) +{ + virgl_renderer_reset(); +} + int virtio_gpu_virgl_init(VirtIOGPU *g) { int ret; diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h index bcf54d970f..24c6628944 100644 --- a/include/hw/virtio/virtio-gpu.h +++ b/include/hw/virtio/virtio-gpu.h @@ -279,6 +279,7 @@ int virtio_gpu_update_dmabuf(VirtIOGPU *g, void virtio_gpu_virgl_process_cmd(VirtIOGPU *g, struct virtio_gpu_ctrl_command *cmd); void virtio_gpu_virgl_fence_poll(VirtIOGPU *g); +void virtio_gpu_virgl_reset_scanout(VirtIOGPU *g); void virtio_gpu_virgl_reset(VirtIOGPU *g); int virtio_gpu_virgl_init(VirtIOGPU *g); int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g);