architecture: 0.733
performance: 0.694
x86: 0.673
peripherals: 0.640
device: 0.604
boot: 0.529
mistranslation: 0.501
network: 0.430
semantic: 0.407
graphic: 0.393
virtual: 0.386
socket: 0.359
PID: 0.358
register: 0.347
i386: 0.344
user-level: 0.344
kernel: 0.325
files: 0.307
vnc: 0.287
ppc: 0.286
assembly: 0.284
VMM: 0.282
permissions: 0.251
hypervisor: 0.237
arm: 0.216
debug: 0.181
risc-v: 0.158
TCG: 0.084
KVM: 0.069

No evdev mouse passthrough with virtio-vga or kvm

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


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