https://www.collabora.com/news-and-blog/blog/2018/02/12/virtualizing-gpu-access/

https://czak.pl/2020/04/09/three-levels-of-qemu-graphics.html

Release date: August 6, 2012

Kernel Linux 4.2 contains the modesetting only drivers. Linux 4.4 contains the 3D supported pieces.

Mesa Mesa master contains the virgl 3D driver.

QEMU QEMU 2.4 contained the initial virtio-gpu with no acceleration support. QEMU 2.5 contains 3D support only with the GTK3 frontend with GL enabled.   Needs SDL2/OpenGL ES 3.0

virglrenderer The virglrenderer library seems mostly API stable.   qemu/ gl=off ==> Screen 0: not direct rendering capable. [liveuser@10 ~]$ glxgears  Running synchronized to the vertical refresh.  The framerate should be approximately the same as the monitor refresh rate. 13763 frames in 5.0 seconds = 2751.700 FPS =====>   gl=off , will decrease to half value  XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0"       after 19218 requests (80 known processed) with 0 events remaining. [liveuser@10 ~]$  [liveuser@10 ~]$ glxinfo |grep rend direct rendering: Yes     GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,      GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,  Extended renderer info (GLX_MESA_query_renderer): OpenGL renderer string: Gallium 0.4 on virgl     GL_MESA_texture_signed_rgba, GL_NV_conditional_render, GL_NV_depth_clamp,      GL_NV_conditional_render, GL_NV_depth_clamp, GL_NV_fog_distance,      GL_OES_element_index_uint, GL_OES_fbo_render_mipmap,  [liveuser@10 ~]$ dmesg  |grep drm  [    6.021248] [drm] Initialized drm 1.1.0 20060810 [    6.085652] [drm] pci: virtio-vga detected [    6.085853] [drm] virgl 3d acceleration enabled [    6.086166] [drm] virtio vbuffers: 272 bufs, 192B each, 51kB total. [    6.089463] [drm] number of scanouts: 1 [    6.089466] [drm] number of cap sets: 1 [    6.094637] [drm] cap set 0: id 1, max-version 1, max-size 308 [    6.111151] virtio_gpu virtio0: fb0: virtiodrmfb frame buffer device [    6.111286] [drm] Initialized virtio_gpu 0.0.1 0 on minor 0 [liveuser@10 ~]$ ls -l /dev/dri/ total 0 crw-rw----+ 1 root video 226,   0 Jun 10 07:45 card0 crw-------. 1 root video 226,  64 Jun 10  2021 controlD64 crw-rw----+ 1 root video 226, 128 Jun 10  2021 renderD128 [liveuser@10 ~]$ ls -l /dev/f fb0   fd/   full  fuse   [liveuser@10 ~]$ ls -l /dev/fb0  crw-rw----. 1 root video 29, 0 Jun 10  2021 /dev/fb0 [liveuser@10 ~]$ glxinfo |grep rend direct rendering: Yes     GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,      GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,  Extended renderer info (GLX_MESA_query_renderer): OpenGL renderer string: Gallium 0.4 on virgl     GL_MESA_texture_signed_rgba, GL_NV_conditional_render, GL_NV_depth_clamp,      GL_NV_conditional_render, GL_NV_depth_clamp, GL_NV_fog_distance,      GL_OES_element_index_uint, GL_OES_fbo_render_mipmap, 

Attention!!

Inside Guest/Fedora 24 system live ISO

[liveuser@10 ~]$ xdriinfo  Screen 0: virtio_gpu =====>  qemu/ gl=off  ==>  Screen 0: not direct rendering capable.

[liveuser@10 ~]$ glxgears  Running synchronized to the vertical refresh.  The framerate should be approximately the same as the monitor refresh rate. 13763 frames in 5.0 seconds = 2751.700 FPS =====>   gl=off , will decrease to half value, about 1200~1300 FPS XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0"       after 19218 requests (80 known processed) with 0 events remaining. [liveuser@10 ~]$