multiseat howto (with some multihead coverage) ============================================== host side --------- First you must compile qemu with a user interface supporting multihead/multiseat and input event routing. Right now this list is pretty short: sdl2. ./configure --enable-sdl --with-sdlabi=2.0 Next put together the qemu command line: qemu -enable-kvm -usb $memory $disk $whatever \ -display sdl \ -vga std \ -device usb-tablet That is it for the first head, which will use the standard vga, the standard ps/2 keyboard (implicitly there) and the usb-tablet. Now the additional switches for the second head: -device pci-bridge,addr=12.0,chassis_nr=2,id=head.2 \ -device secondary-vga,bus=head.2,addr=02.0,id=video.2 \ -device nec-usb-xhci,bus=head.2,addr=0f.0,id=usb.2 \ -device usb-kbd,bus=usb.2.0,port=1,display=video.2 \ -device usb-tablet,bus=usb.2.0,port=2,display=video.2 This places a pci bridge in slot 12, connects a display adapter and xhci (usb) controller to the bridge. Then it adds a usb keyboard and usb mouse, both connected to the xhci and linked to the display. The "display=video2" sets up the input routing. Any input coming from the window which belongs to the video.2 display adapter will be routed to these input devices. guest side ---------- You need a pretty recent linux guest. systemd with loginctl. kernel 3.14+ with CONFIG_DRM_BOCHS enabled. Fedora 20 will do. Must be fully updated for the new kernel though, i.e. the live iso doesn't cut it. Now we'll have to configure the guest. Boot and login. "lspci -vt" should list the pci bridge with the display adapter and usb controller: [root@fedora ~]# lspci -vt -[0000:00]-+-00.0 Intel Corporation 440FX - 82441FX PMC [Natoma] [ ... ] \-12.0-[01]--+-02.0 Device 1234:1111 \-0f.0 NEC Corporation USB 3.0 Host Controller Good. Now lets tell the system that the pci bridge and all devices below it belong to a separate seat by dropping a file into /etc/udev/rules.d: [root@fedora ~]# cat /etc/udev/rules.d/70-qemu-autoseat.rules SUBSYSTEMS=="pci", DEVPATH=="*/0000:00:12.0", TAG+="seat", ENV{ID_AUTOSEAT}="1" Reboot. System should come up with two seats. With loginctl you can check the configuration: [root@fedora ~]# loginctl list-seats SEAT seat0 seat-pci-pci-0000_00_12_0 2 seats listed. You can use "loginctl seat-status seat-pci-pci-0000_00_12_0" to list the devices attached to the seat. Background info is here: http://www.freedesktop.org/wiki/Software/systemd/multiseat/ Enjoy! -- Gerd Hoffmann