Black Screen with Spice and OpenGL acceleration in virt-manager with QEMU/KVM

[Filip Banák]

Hello.

I just want to use an Arch Linux guest with OpenGL 3D acceleration on with
Spice.
It works with Spice when the OpenGL acceleration is disabled.
But when I enable it (with vitio graphics with accel3d yes of course), I
only see a black screen, but when the VM boots I can interact with it
through the keyboard blindly.
Please see my forum thread here for more:
https://forum.manjaro.org/t/qemu-kvm-vm-in-virt-manager-is-running-with-a-black-screen-when-opengl-acceleration-is-turned-on/138632

I also tested all this:

Working with no acceleration with Spice without gl=on in -display:
qemu-system-x86_64 -drive file=/home/filip/VM/archlinux.qcow2 -m 8192
-enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1 -display
spice-app -usb -device usb-tablet -bios /usr/share/ovmf/x64/OVMF_CODE.fd
-boot order=c -device virtio-vga,virgl=on


Not working with Spice with gl=on in -display, remote-viewer closes
instantly:
qemu-system-x86_64 -drive file=/home/filip/VM/archlinux.qcow2 -m 8192
-enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1 -display
spice-app,gl=on -usb -device usb-tablet -bios
/usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c -device virtio-vga,virgl=on

    Error: qemu-system-x86_64: warning: Spice:
dcc.c:664:dcc_push_monitors_config: monitors_config is NULL


Probably Working with acceleration(just no graphical output) without Spice
with -display gtk,gl=on
qemu-system-x86_64 -drive file=/home/filip/VM/archlinux.qcow2 -m 8192
-enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1 -display
gtk,gl=on -usb -device usb-tablet -bios /usr/share/ovmf/x64/OVMF_CODE.fd
-boot order=c -device virtio-vga,virgl=on

    No error just black screen.


Working with acceleration without Spice, just QEMU SDL:
qemu-system-x86_64 -drive file=/home/filip/VM/archlinux.qcow2 -m 8192
-enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1 -display
sdl,gl=on -usb -device usb-tablet -bios /usr/share/ovmf/x64/OVMF_CODE.fd
-boot order=c -device virtio-vga,virgl=on


Working with with Spice with acceleration with EGL-HEADLESS, gl=on in
-display does not matter here, it is automatic/implied:
qemu-system-x86_64 -name Arch -drive file=/home/filip/VM/archlinux.qcow2 -m
8192 -enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1
-display egl-headless,gl=on -usb -device usb-tablet -bios
/usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c -device virtio-vga,virgl=on
-spice
disable-ticketing,image-compression=off,seamless-migration=on,unix,addr=/run/user/1000/spice.sock

remote-viewer --verbose --debug --spice-debug
spice+unix:///run/user/1000/spice.sock


Working SDL with acceleration, also can connect with Spice but see black
screen but can use keyboard and mouse and see output on qemu sdl window:
qemu-system-x86_64 -name Arch -drive file=/home/filip/VM/archlinux.qcow2 -m
8192 -enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1 -usb
-device usb-tablet -bios /usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c
-device virtio-vga,virgl=on -spice
unix,addr=/run/user/1000/spice.sock,disable-ticketing,image-compression=off,seamless-migration=on
-display sdl,gl=on


Not working Remote Viewer opens but no output just "Connected to graphic
server" in the middle of the window.
qemu-system-x86_64 -name Arch -drive file=/home/filip/VM/archlinux.qcow2 -m
8192 -enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1 -usb
-device usb-tablet -bios /usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c
-device virtio-vga,virgl=on -spice
gl=on,unix,addr=/run/user/1000/spice.sock,disable-ticketing,image-compression=off,seamless-migration=on

remote-viewer --verbose --debug --spice-debug
spice+unix:///run/user/1000/spice.sock

I guess the problem when trying with virt-manager is the same as when
trying with -display spice-app,gl=on.

Running on Manjaro linux with Nvidia GT630 graphics and Qemu version 4.2.
Any help is appreciated.
Thank you.
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