[Spice-devel] [PATCH RFC EXP] remote Virgl support

[Marc-André Lureau]

Hi

----- Original Message -----
> 
> > Hi
> > 
> > ----- Original Message -----
> > > 
> > > > Hi,
> > > > 
> > > > > Yes you want to use EGL here, I think we could probably put more code
> > > > > in
> > > > > qemu
> > > > > to help with this case.
> > > > 
> > > > Sure, if anything is needed we'll get that sorted ;)
> > > > 
> > > > I suspect spice-server needs access to the gl context helpers
> > > > (dpy_gl_ctx_*) if it wants use opengl.
> > > > 
> > > 
> > > I would prefer some more low level (like EGLDisplay, EGLContext or
> > > EGLSurface),
> > > I'll do some more digging, not clear what a possible interface should be,
> > > surely having duplicate EGL initialization (Qemu and spice-server) does
> > > not
> > > look
> > > a good thing.
> > > 
> > > In the meantime I was trying gstreamer-vaapi (thanks to Christophe) and
> > > did some more digging. Gstreamer seems to suppose that a dmabuf is
> > > mmap-able.
> > 
> > I double gst_vaapi_surface_new_from_egl_image() will be mmap'ed by
> > vaapi*enc
> > 
> > > About vaapi implementation looks like Intel if quite good but for other
> > > cards is not that great. Particularly for Nvidia the plugin is an
> > > adapter for vdpau which does decoding, not encoding. Encoding for
> > > Nvidia is done with NvENC (which looks hard to install on Linux).
> > 
> > Yep, a handful of encoding APIs to deal with. Hopefully GStreamer can
> > abstract it away for us. Anyway that's the best place to do that in the
> > stack imho. I think it would be better to ask all that gstreamer question
> > on
> > gst-devel ML.
> > 
> 
> Sent a mail just now. Looks like the master version is quite different
> from F24 packaged one and exports gst_vaapi_surface_new_from_egl_image.
> 
> > > Another problem I got (I should open a bug) is that Qemu with Virgl
> > > wake up spice 40/50 times a seconds (calling spice_qxl_wakeup) for no
> > > apparent reason.
> > 
> > There are some gui timer bits that could be disabled iirc
> > 
> 
> Do you know which one? At the beginning I was worried this was true
> even for QXL but is not. Looks like it only happens for Virgl.
> 

See some commits here: https://github.com/elmarco/qemu/commits/virgl

In particular https://github.com/elmarco/qemu/commit/ee6c0cf4d639ac32b9fad9e3db7cffdea6b2599f

> Frediano
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