Re: [QEMU PATCH v5 06/13] virtio-gpu: Support context init feature with virglrenderer

[Huang Rui <ray.huang@amd.com>]

On Sat, Sep 16, 2023 at 06:42:04PM +0800, Akihiko Odaki wrote:
> On 2023/09/16 19:32, Huang Rui wrote:
> > On Fri, Sep 15, 2023 at 11:20:46PM +0800, Akihiko Odaki wrote:
> >> On 2023/09/15 20:11, Huang Rui wrote:
> >>> Patch "virtio-gpu: CONTEXT_INIT feature" has added the context_init
> >>> feature flags.
> >>> We would like to enable the feature with virglrenderer, so add to create
> >>> virgl renderer context with flags using context_id when valid.
> >>>
> >>> Originally-by: Antonio Caggiano <antonio.caggiano@collabora.com>
> >>> Signed-off-by: Huang Rui <ray.huang@amd.com>
> >>> ---
> >>>
> >>> V4 -> V5:
> >>>       - Inverted patch 5 and 6 because we should configure
> >>>         HAVE_VIRGL_CONTEXT_INIT firstly. (Philippe)
> >>>
> >>>    hw/display/virtio-gpu-virgl.c | 13 +++++++++++--
> >>>    hw/display/virtio-gpu.c       |  2 ++
> >>>    2 files changed, 13 insertions(+), 2 deletions(-)
> >>>
> >>> diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
> >>> index 8bb7a2c21f..312953ec16 100644
> >>> --- a/hw/display/virtio-gpu-virgl.c
> >>> +++ b/hw/display/virtio-gpu-virgl.c
> >>> @@ -106,8 +106,17 @@ static void virgl_cmd_context_create(VirtIOGPU *g,
> >>>        trace_virtio_gpu_cmd_ctx_create(cc.hdr.ctx_id,
> >>>                                        cc.debug_name);
> >>>    
> >>> -    virgl_renderer_context_create(cc.hdr.ctx_id, cc.nlen,
> >>> -                                  cc.debug_name);
> >>> +    if (cc.context_init) {
> >>> +#ifdef HAVE_VIRGL_CONTEXT_INIT
> >>> +        virgl_renderer_context_create_with_flags(cc.hdr.ctx_id,
> >>> +                                                 cc.context_init,
> >>> +                                                 cc.nlen,
> >>> +                                                 cc.debug_name);
> >>> +        return;
> >>> +#endif
> >>
> >> This should deal with the case when context_init is set while
> >> HAVE_VIRGL_CONTEXT_INIT is not defined.
> > 
> > Actually, I received the comment below before:
> > 
> > https://lore.kernel.org/qemu-devel/32588d0e-a1f2-30c4-5e9f-e6e7c4190b65@linaro.org/
> > 
> > At original patch set, I have the case while HAVE_VIRGL_CONTEXT_INIT is set
> > but HAVE_VIRGL_CONTEXT_INIT is not defined. But I think we may encounter
> > the case that virgl_renderer_context_create_with_flags is not defined in
> > virglrenderer early version. Should I bring the error message back?
> > 
> > Thanks,
> > Ray
> 
> I suggest checking VIRTIO_GPU_FLAG_CONTEXT_INIT_ENABLED instead of 
> reporting an error here. Perhaps it may be easier to add #ifdef around:
>  > +    DEFINE_PROP_BIT("context_init", VirtIOGPU, parent_obj.conf.flags,
>  > +                    VIRTIO_GPU_FLAG_CONTEXT_INIT_ENABLED, false),

How about below changes:

---
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 8bb7a2c21f..54a3cfe136 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -106,8 +106,15 @@ static void virgl_cmd_context_create(VirtIOGPU *g,
     trace_virtio_gpu_cmd_ctx_create(cc.hdr.ctx_id,
                                     cc.debug_name);

-    virgl_renderer_context_create(cc.hdr.ctx_id, cc.nlen,
-                                  cc.debug_name);
+    if (cc.context_init && virtio_gpu_context_init_enabled(g->conf)) {
+        virgl_renderer_context_create_with_flags(cc.hdr.ctx_id,
+                                                 cc.context_init,
+                                                 cc.nlen,
+                                                 cc.debug_name);
+        return;
+    }
+
+    virgl_renderer_context_create(cc.hdr.ctx_id, cc.nlen, cc.debug_name);
 }

 static void virgl_cmd_context_destroy(VirtIOGPU *g,
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index be16efbd38..6ff2c8e92d 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1508,6 +1508,10 @@ static Property virtio_gpu_properties[] = {
     DEFINE_PROP_BIT("blob", VirtIOGPU, parent_obj.conf.flags,
                     VIRTIO_GPU_FLAG_BLOB_ENABLED, false),
     DEFINE_PROP_SIZE("hostmem", VirtIOGPU, parent_obj.conf.hostmem, 0),
+#ifdef HAVE_VIRGL_CONTEXT_INIT
+    DEFINE_PROP_BIT("context_init", VirtIOGPU, parent_obj.conf.flags,
+                    VIRTIO_GPU_FLAG_CONTEXT_INIT_ENABLED, true),
+#endif
     DEFINE_PROP_END_OF_LIST(),
 };