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hw/display: fix virgl reset regression

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Before commit 49afbca3b0 ("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 <marcandre.lureau@redhat.com>
Message-Id: <20210702123221.942432-1-marcandre.lureau@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Marc-André Lureau 2021-07-02 16:32:21 +04:00 committed by Gerd Hoffmann
parent f29d52611c
commit 8a13b9bc0f
3 changed files with 18 additions and 13 deletions
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22
hw/display/virtio-gpu-gl.c
View File

@ -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;
}
}

8
hw/display/virtio-gpu-virgl.c
View File

@ -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;

1
include/hw/virtio/virtio-gpu.h
View File

@ -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);