I could still use some tipps on graphic acceleration for Windows guests
running under KVM/QEMU. Do you get 3D-Acceleration without GPU-passthrough and
how?

Thank you for your answer!

Best regards, Adrian.

In der Nachricht vom Tuesday, 2 April 2024 13:13:52 CEST schrieb Adrian Zaugg:
> Hi
>
> For the youngest member of the BSOD-Family of operating systems some of the
> prerequisites are "DirectX" and "WDDM2". This can be achieved under KVM/QEMU
> with the QXL driver and a Display of type Spice. On huge Displays (38", 4K)
> this driver does not perform so well. I am not asking for any pass-through
> configuration since the VM screen should be in a window on top of Linux X11
> and there is no spare GPU around.
>
> Using the VirtIO Video driver instead, performance is much better, but there
> is no WDDM2 support without OpenGL switched on. Trying to switch on OpenGL
> yields in different results in Daedalus, Chimaera and on different
> hardware. I use virt-manager from libvirt for configuration, so the terms
> Video and Display refer to the respective configuration options. The latest
> guest additions and VirtIO drivers are installed in the guest btw.
>
> On my Tiger Lake Laptop under Chimaera with Intel XE graphics for example I
> can switch on OpenGL under Display and use it together with Video VirtIO and
> 3D acceleration switched on. It just gets terribly slow. Without OpenGL
> switched on, it is fast but there is no "WDDM2" support.
>
> On a AMD Ryzen 5700G under Daedalus there are errors from Apparmor switching
> on OpenGL. Adding an Apparmor profile to allow the needed path, these
> errors go away, but then the VM process dies during start-up of the vm
> (before booting the guest). There is no further error seen in syslog.
>
> If there is no discrete GPU for the VM and 3D and OpenGL is switched on with
> VirtIO, does it use libvirglrenderer1 which in turn means that graphics get
> rendered on the CPU? Is this the reason why performance is so slow?
>
> What do you do to get good video performance, 3D acceleration and comply
> with the requirements for the latest BSOD-Family-OS? Do you connect your
> Display through RDP, Spice or VNC?
>
> Thank you for answers.
>
> Best regards, Adrian.