Related changes on the upsteams:

- https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/940
- https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18831

FWIW, Fedora appear to have enabled this [1]

[1] https://src.fedoraproject.org/rpms/virglrenderer/c/e711daa1385ad0d26d4b91ea62fc426104fcaf7b?branch=rawhide

Thank you for the report. I recompiled the package with this option and it is available in testing right now. Please try virglrenderer-0.10.3-2 and let me know if you see any issues.

Thank you for your prompt response. I will try the package as soon as possible!

I found no issues on the package.

Host:

$ vainfo
Trying display: wayland
vainfo: VA-API version: 1.16 (libva 2.16.0)
vainfo: Driver version: Mesa Gallium driver 22.3.1 for AMD Radeon RX 5500 XT (navi14, LLVM 14.0.6, DRM 3.49, 6.1.0-zen1-1-zen)
vainfo: Supported profile and entrypoints
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointVLD
VAProfileVC1Simple : VAEntrypointVLD
VAProfileVC1Main : VAEntrypointVLD
VAProfileVC1Advanced : VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
VAProfileH264Main : VAEntrypointVLD
VAProfileH264Main : VAEntrypointEncSlice
VAProfileH264High : VAEntrypointVLD
VAProfileH264High : VAEntrypointEncSlice
VAProfileHEVCMain : VAEntrypointVLD
VAProfileHEVCMain : VAEntrypointEncSlice
VAProfileHEVCMain10 : VAEntrypointVLD
VAProfileHEVCMain10 : VAEntrypointEncSlice
VAProfileJPEGBaseline : VAEntrypointVLD
VAProfileVP9Profile0 : VAEntrypointVLD
VAProfileVP9Profile2 : VAEntrypointVLD
VAProfileNone : VAEntrypointVideoProc

$ qemu-system-x86_64 -m 4G -M q35 --accel kvm --cpu host --smp 2 --cdrom out/archlinux-live-2022.12.17-x86_64.iso --display gtk,gl=on --vga none --device virtio-vga-gl --usbdevice tablet

Guest:

$ vainfo --display drm
Trying display: drm
vainfo: VA-API version: 1.16 (libva 2.16.0)
vainfo: Driver version: Mesa Gallium driver 22.3.1 for virgl (AMD Radeon RX 5500 XT (navi14, LLVM 14.0.6, DRM 3.49...)
vainfo: Supported profile and entrypoints
VAProfileNone : VAEntrypointVideoProc

However, I found that qemu support is also required to support hardware video acceleration on VMs completely.

hw/display/virtio-gpu-virgl.c:

```
int virtio_gpu_virgl_init(VirtIOGPU *g)
{
int ret;

ret = virgl_renderer_init(g, 0, &virtio_gpu_3d_cbs);
if (ret != 0) {
error_report("virgl could not be initialized: %d", ret);
return ret;
}
```

Probably, need to set virgl_renderer_init(... VIRGL_RENDERER_USE_VIDEO ...) and virtio_gpu_3d_cbs->get_drm_fd.

Shohei, do you know if there is a qemu build switch to enable the hw support you are looking for?

Sorry, I have no idea about the build switch. An user tried using vaapi, but the result is as the same as mine.

- https://www.phoronix.com/forums/forum/phoronix/latest-phoronix-articles/1357918-virgl-adds-accelerated-video-encoding-to-guest-vms?p=1357967#post1357967