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

[Huang Rui <ray.huang@xxxxxxx>]

On Sun, Sep 17, 2023 at 01:49:19PM +0800, Akihiko Odaki wrote:
> On 2023/09/17 14:45, Huang Rui wrote:
> > 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@xxxxxxxxxxxxx>
> >>>>> Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
> >>>>> ---
> >>>>>
> >>>>> 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@xxxxxxxxxx/
> >>>
> >>> 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(),
> >   };
> > 
> 
> It looks better, but not having #ifdef around 
> virgl_renderer_context_create_with_flags() will result in a link error 
> with old virglrenderer.

Hmm, right, it seems that we have to have a "#ifdef" around here. Or do you
have any better idea?

Thanks,
Ray