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Subject: Re: [PATCH v1 2/2] virtio-gpu: add context init support
On Wed, Sep 08, 2021 at 06:29:53PM -0700, Gurchetan Singh wrote:
> This brings explicit context initialization and different types
> to virtio-gpu.
>
> In the past, VIRTIO_GPU_F_VIRGL meant the virglrenderer support.
> With VIRTIO_GPU_F_VIRGL + VIRTIO_GPU_F_CONTEXT_INIT, this means
> generic 3D virtualization defined by the context type. It's
> entirely possible the virglrenderer project isn't available on
> the host in this scenario. The VIRTIO_GPU_F_VIRGL naming
> convention is kept since it's easier to redefine the meaning
> rather than changing header files.
>
> The context type is associated an particular capset id. Virgl
> has two capsets due a prior bug, but for other cases the 1:1
> mapping between context type and capset id is valid.
>
> In addition, fencing needs to be fixed to accomodate multiple
> context types. In the past, there was one global timeline
> associated witht the OpenGL rendering. Now, there are multiple
> timelines which can be associated with GL, VK or even display
> contexts.
>
> v2: Correct number of bits
> v3: le32 info --> {u8 ring_idx + u8 padding[3])
>Â Â ÂDon't require FLAG_FENCE and FLAG_RING_IDX
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
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