I have debian-11 qube providing the VM through PV/HVM that has dGPU assigned on PCI 00:00.0, but it’s unable to use the dGPU.
How can i make my debian-11 qube to use the dGPU e.g. to play supertuxkart?
Tried solutions
Radeon module is loaded
I was unable to modprobe radeon so i removed the nomodeset from kernel cmdline (more in R4.1(x86_64) unable to unset `nomodeset` kernel CLI in PV).
Preference of HVM
PV seems to be more efficient for this usecase compared to HVM(?), responsiveness and performance of the HW are important, but xen wiki explicitly requires HVM[1].
Method of testing
Was using DRI_PRIME=1 glxinfo | grep "OpenGL ren" this works in Dom0 when the VGA is assigned there.
Comply with instructions from xen wiki[1]
Xen wiki requires these properties set apropriately Invoked:
[root@dom0 xen]# qvm-features supertuxkart gfx_passthru "1"
[root@dom0 xen]# qvm-features supertuxkart pci "['01:00.0']"
Was unable to find the /etc/xen/<guest> on Qubes, assuming it’s using different directory.
XEN_PCIDEV_BACKEND is set as module
Xen wiki[1] requires XEN_PCIDE_BACKEND available in the linux kernel used in dom0 which is already set:
[root@dom0 xen]# cat "/boot/config-$(uname -r)" | grep XEN_PCIDEV_BACKEND
CONFIG_XEN_PCIDEV_BACKEND=m
Relevants:
- Xen wiki about VGA passthrough https://wiki.xenproject.org/wiki/Xen_VGA_Passthrough