No evdev mouse passthrough with virtio-vga or kvm

[gatestallman]

Hi,

Using qemu version 3.1.0-1 on a host with the latest Archlinux 64-bit distribution, and running the same OS as guest, the mouse doesn't work when using both evdev passthrough and virtio-vga, or when using both evdev passthrough and kvm.

The following command line runs a machine that does not receive any mouse event:
qemu-system-x86_64 -machine type=q35,accel=kvm -cpu host -accel kvm -boot order=dc,menu=on -m size=2048 -net nic -device virtio-vga -device intel-hda -name Linux -drive file=/mnt/data/nobody/linux/arch.img,if=virtio -display sdl,gl=on -full-screen -net user -D /dev/null -rtc base=utc,clock=host,driftfix=slew -nodefaults -object input-linux,id=kbd1,evdev=/dev/input/event6,grab_all=on,repeat=on -object input-linux,id=mouse1,evdev=/dev/input/event7

But with this command line, removing virtio-vga and kvm, the mouse works as expected:
qemu-system-x86_64 -machine type=q35 -boot order=dc,menu=on -m size=2048 -net nic -device cirrus-vga -device intel-hda -name Linux -drive file=/mnt/data/nobody/linux/arch.img,if=virtio -display sdl,gl=on -full-screen -net user -D /dev/null -rtc base=utc,clock=host,driftfix=slew -nodefaults -object input-linux,id=kbd1,evdev=/dev/input/event6,grab_all=on,repeat=on -object input-linux,id=mouse1,evdev=/dev/input/event7

Note: Passing a keyboard by evdev in the same way always works, the problem is mouse specific.

Thanks in advance for the analysis,
gatestallman

[Thomas Huth (th-huth)]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/165