[BUG] qemu git error with virgl

[Torsten Wohlfarth <towo@siduction.org>]

Hello,

i can't start any system if i use virgl. I get the following error:

qemu-x86_64: ../ui/console.c:1791: dpy_gl_ctx_create: Assertion 
`con->gl' failed.
./and.sh: line 27: 3337167 Aborted                 qemu-x86_64 -m 4096 
-smp cores=4,sockets=1 -cpu host -machine pc-q35-4.0,accel=kvm -device 
virtio-vga,virgl=on,xres=1280,yres=800 -display sdl,gl=on -device 
intel-hda,id=sound0,msi=on -device 
hda-micro,id=sound0-codec0,bus=sound0.0,cad=0 -device qemu-xhci,id=xhci 
-device usb-tablet,bus=xhci.0 -net 
nic,macaddr=52:54:00:12:34:62,model=e1000 -net 
tap,ifname=$INTERFACE,script=no,downscript=no -drive 
file=/media/daten2/image/lineageos.qcow2,if=virtio,index=1,media=disk,cache=none,aio=threads
Set 'tap3' nonpersistent

i have bicected the issue:

towo:Defiant> git bisect good
b4e1a342112e50e05b609e857f38c1f2b7aafdc4 is the first bad commit
commit b4e1a342112e50e05b609e857f38c1f2b7aafdc4
Author: Paolo Bonzini <pbonzini@redhat.com>
Date:   Tue Oct 27 08:44:23 2020 -0400

     vl: remove separate preconfig main_loop

     Move post-preconfig initialization to the x-exit-preconfig. If 
preconfig
     is not requested, just exit preconfig mode immediately with the QMP
     command.

     As a result, the preconfig loop will run with accel_setup_post
     and os_setup_post restrictions (xen_restrict, chroot, etc.)
     already done.

     Reviewed-by: Igor Mammedov <imammedo@redhat.com>
     Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

  include/sysemu/runstate.h |  1 -
  monitor/qmp-cmds.c        |  9 -----
  softmmu/vl.c              | 95 
++++++++++++++++++++---------------------------
  3 files changed, 41 insertions(+), 64 deletions(-)

Regards,

Torsten Wohlfarth