Re: [QEMU PATCH v4 05/13] virtio-gpu: Support context init feature with virglrenderer

[Philippe Mathieu-Daudé]

On 31/8/23 11:32, 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>
> ---
>
> New patch, result of splitting
> [RFC QEMU PATCH 04/18] virtio-gpu: CONTEXT_INIT feature
>
>   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

What happens if someone sets the 'context_init' property but virgl
doesn't have virgl_renderer_context_create_with_flags()? Should we
report an error?

> +    }
> +
> +    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 3e658f1fef..a66cbd9930 100644
> --- a/hw/display/virtio-gpu.c
> +++ b/hw/display/virtio-gpu.c
> @@ -1506,6 +1506,8 @@ 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),
> +    DEFINE_PROP_BIT("context_init", VirtIOGPU, parent_obj.conf.flags,
> +                    VIRTIO_GPU_FLAG_CONTEXT_INIT_ENABLED, false),
>       DEFINE_PROP_END_OF_LIST(),
>   };
>