> > I was more thinking about a struct containing enough info to allow the
> > proxy on the host side find the buffer, something like:
> >
> > struct {
> > enum type { stdvga, virtio-cpu, ... }
> > pcislot device;
> > union {
> > int stdvga_pcibar_offset;
> > int virtio_gpu_resource_id;
> > }
> > }
> >
> > So when the guest proxy gets a message with a fd referencing a buffer it
> > would have to figure where the buffer is, rewrite the message into the
> > struct above for the host proxy. The host proxy would rewrite the
> > message again for the server.
>
> What I don't understand yet is how we can keep the buffer descriptions
> together with the protocol data that references them.
>
> With SCM_RIGHTS, the FDs are placed in the ancillary data that "travels"
> together with the protocol data that references them.
Place the buffer description into the wayland extension protocol messages?
i.e. have some wl_virt_proxy protocol extension. Then, for the stdvga case:
(1) client sends wl_drm/create_prime_buffer request to the guest proxy
(2) guest proxy rewrites this into wl_virt_proxy/create_buffer, or
maybe a create_stdvga_buffer request, carrying all the information
listed above, and sends it to the host proxy.
(3) host proxy rewrites it again into a wl_shm_pool/create_buffer and
forwards it to the server.
cheers,
Gerd
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