virglrenderer for 3d support

[dcsapak]

Hi,

AFAIK one must add multiple new options for venus to work, according to the docs:

`virtio-gpu-gl,hostmem=8G,blob=true,venus=true`
(the 8G are just as an example)

but i tried here on a test machine (with an radeon RX560 on the host and i always got `error_out_of_host_memory` when running vulkaninfo on the guest.
Since the docs are not very expansive, I'm not sure if there is something missing (vulkan drivers are installed on host and guest, kernels should be new enough, qemu and mesa as well...)

 

[DocMAX]

How did you do it? I still get:

kvm: -device virtio-gpu-gl,hostmem=8G,blob=true,venus=true: old virglrenderer, blob resources unsupported

So i am not even able to start the VM. Can you show me your QEMU version so i know it's not a QEMU problem?

 

[dcsapak]

i tested on the pve9 beta with kvm version:

QEMU emulator version 10.0.2 (pve-qemu-kvm_10.0.2-4)

 

[DocMAX]

Ah that explains it. I'm still on 8 until 9 is final (and venus fixed). Maybe you can also test DRM native context as well? (Should be "-device virtio-vga-gl,blob=true,context_init=true,hostmem=4G")

 

[dcsapak]

that property (context_init) does not exist here, i'll have to look if there is some compile flag that has to be activated...

 

[DocMAX]

sorry, it's ...,hostmem=4G,blob=on,drm_native_context=on
see https://mail.gnu.org/archive/html/qemu-devel/2025-01/msg00998.html

 

[dcsapak]

ah ok, the latest version of the patches are here: https://mail.gnu.org/archive/html/qemu-devel/2025-06/msg00011.html

and they are not yet applied in qemu, so maybe in a later qemu 10.x release