[Qemu-devel] [Bug 1818398] [NEW] No evdev mouse passthrough with virtio-vga or kvm

[Yohann Agrebbe]

Public bug reported:

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

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: evdev kvm mouse virtio-vga

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https://bugs.launchpad.net/bugs/1818398

Title:
  No evdev mouse passthrough with virtio-vga or kvm

Status in QEMU:
  New

Bug description:
  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

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