Gerd Hoffmann | 8977bd1 | 2014-05-20 09:17:01 +0200 | [diff] [blame] | 1 | |
| 2 | multiseat howto (with some multihead coverage) |
| 3 | ============================================== |
| 4 | |
| 5 | host side |
| 6 | --------- |
| 7 | |
| 8 | First you must compile qemu with a user interface supporting |
Gerd Hoffmann | 90525fe | 2014-06-02 15:39:54 +0200 | [diff] [blame] | 9 | multihead/multiseat and input event routing. Right now this |
| 10 | list includes sdl2 and gtk (both 2+3): |
Gerd Hoffmann | 8977bd1 | 2014-05-20 09:17:01 +0200 | [diff] [blame] | 11 | |
| 12 | ./configure --enable-sdl --with-sdlabi=2.0 |
| 13 | |
Gerd Hoffmann | 90525fe | 2014-06-02 15:39:54 +0200 | [diff] [blame] | 14 | or |
| 15 | |
| 16 | ./configure --enable-gtk |
| 17 | |
Gerd Hoffmann | 8977bd1 | 2014-05-20 09:17:01 +0200 | [diff] [blame] | 18 | |
| 19 | Next put together the qemu command line: |
| 20 | |
| 21 | qemu -enable-kvm -usb $memory $disk $whatever \ |
Gerd Hoffmann | 90525fe | 2014-06-02 15:39:54 +0200 | [diff] [blame] | 22 | -display [ sdl | gtk ] \ |
Gerd Hoffmann | 8977bd1 | 2014-05-20 09:17:01 +0200 | [diff] [blame] | 23 | -vga std \ |
| 24 | -device usb-tablet |
| 25 | |
| 26 | That is it for the first head, which will use the standard vga, the |
| 27 | standard ps/2 keyboard (implicitly there) and the usb-tablet. Now the |
| 28 | additional switches for the second head: |
| 29 | |
| 30 | -device pci-bridge,addr=12.0,chassis_nr=2,id=head.2 \ |
| 31 | -device secondary-vga,bus=head.2,addr=02.0,id=video.2 \ |
| 32 | -device nec-usb-xhci,bus=head.2,addr=0f.0,id=usb.2 \ |
| 33 | -device usb-kbd,bus=usb.2.0,port=1,display=video.2 \ |
| 34 | -device usb-tablet,bus=usb.2.0,port=2,display=video.2 |
| 35 | |
| 36 | This places a pci bridge in slot 12, connects a display adapter and |
| 37 | xhci (usb) controller to the bridge. Then it adds a usb keyboard and |
| 38 | usb mouse, both connected to the xhci and linked to the display. |
| 39 | |
| 40 | The "display=video2" sets up the input routing. Any input coming from |
| 41 | the window which belongs to the video.2 display adapter will be routed |
| 42 | to these input devices. |
| 43 | |
Gerd Hoffmann | 90525fe | 2014-06-02 15:39:54 +0200 | [diff] [blame] | 44 | The sdl2 ui will start up with two windows, one for each display |
| 45 | device. The gtk ui will start with a single window and each display |
| 46 | in a separate tab. You can either simply switch tabs to switch heads, |
| 47 | or use the "View / Detach tab" menu item to move one of the displays |
| 48 | to its own window so you can see both display devices side-by-side. |
| 49 | |
Gerd Hoffmann | 2082bac | 2014-06-02 15:48:41 +0200 | [diff] [blame] | 50 | Note on spice: Spice handles multihead just fine. But it can't do |
| 51 | multiseat. For tablet events the event source is sent to the spice |
| 52 | agent. But qemu can't figure it, so it can't do input routing. |
| 53 | Fixing this needs a new or extended input interface between |
| 54 | libspice-server and qemu. For keyboard events it is even worse: The |
| 55 | event source isn't included in the spice protocol, so the wire |
| 56 | protocol must be extended to support this. |
| 57 | |
Gerd Hoffmann | 8977bd1 | 2014-05-20 09:17:01 +0200 | [diff] [blame] | 58 | |
| 59 | guest side |
| 60 | ---------- |
| 61 | |
| 62 | You need a pretty recent linux guest. systemd with loginctl. kernel |
| 63 | 3.14+ with CONFIG_DRM_BOCHS enabled. Fedora 20 will do. Must be |
| 64 | fully updated for the new kernel though, i.e. the live iso doesn't cut |
| 65 | it. |
| 66 | |
Gerd Hoffmann | 3503206 | 2014-05-26 09:52:48 +0200 | [diff] [blame] | 67 | Now we'll have to configure the guest. Boot and login. "lspci -vt" |
| 68 | should list the pci bridge with the display adapter and usb controller: |
Gerd Hoffmann | 8977bd1 | 2014-05-20 09:17:01 +0200 | [diff] [blame] | 69 | |
Gerd Hoffmann | 3503206 | 2014-05-26 09:52:48 +0200 | [diff] [blame] | 70 | [root@fedora ~]# lspci -vt |
| 71 | -[0000:00]-+-00.0 Intel Corporation 440FX - 82441FX PMC [Natoma] |
| 72 | [ ... ] |
| 73 | \-12.0-[01]--+-02.0 Device 1234:1111 |
| 74 | \-0f.0 NEC Corporation USB 3.0 Host Controller |
Gerd Hoffmann | 8977bd1 | 2014-05-20 09:17:01 +0200 | [diff] [blame] | 75 | |
Gerd Hoffmann | 3503206 | 2014-05-26 09:52:48 +0200 | [diff] [blame] | 76 | Good. Now lets tell the system that the pci bridge and all devices |
| 77 | below it belong to a separate seat by dropping a file into |
| 78 | /etc/udev/rules.d: |
Gerd Hoffmann | 8977bd1 | 2014-05-20 09:17:01 +0200 | [diff] [blame] | 79 | |
Gerd Hoffmann | 3503206 | 2014-05-26 09:52:48 +0200 | [diff] [blame] | 80 | [root@fedora ~]# cat /etc/udev/rules.d/70-qemu-autoseat.rules |
| 81 | SUBSYSTEMS=="pci", DEVPATH=="*/0000:00:12.0", TAG+="seat", ENV{ID_AUTOSEAT}="1" |
Gerd Hoffmann | 8977bd1 | 2014-05-20 09:17:01 +0200 | [diff] [blame] | 82 | |
Gerd Hoffmann | 3503206 | 2014-05-26 09:52:48 +0200 | [diff] [blame] | 83 | Reboot. System should come up with two seats. With loginctl you can |
| 84 | check the configuration: |
| 85 | |
| 86 | [root@fedora ~]# loginctl list-seats |
| 87 | SEAT |
| 88 | seat0 |
| 89 | seat-pci-pci-0000_00_12_0 |
| 90 | |
| 91 | 2 seats listed. |
| 92 | |
| 93 | You can use "loginctl seat-status seat-pci-pci-0000_00_12_0" to list |
| 94 | the devices attached to the seat. |
| 95 | |
| 96 | Background info is here: |
| 97 | http://www.freedesktop.org/wiki/Software/systemd/multiseat/ |
Gerd Hoffmann | 8977bd1 | 2014-05-20 09:17:01 +0200 | [diff] [blame] | 98 | |
| 99 | Enjoy! |
| 100 | |
| 101 | -- |
| 102 | Gerd Hoffmann <kraxel@redhat.com> |