@@ -46,29 +46,37 @@ You need a pretty recent linux guest. systemd with loginctl. kernel
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. By default
-all devices belong to seat0. You can use "loginctl seat-status seat0"
-to list them all (and to get the sysfs paths for cut+paste). Now
-we'll go assign all pci devices connected the pci bridge in slot 12 to
-a new head:
-
-loginctl attach seat-qemu \
- /sys/devices/pci0000:00/0000:00:12.0/0000:01:02.0/drm/card1
-loginctl attach seat-qemu \
- /sys/devices/pci0000:00/0000:00:12.0/0000:01:02.0/graphics/fb1
-loginctl attach seat-qemu \
- /sys/devices/pci0000:00/0000:00:12.0/0000:01:0f.0/usb2
-
-Use "loginctl seat-status seat-qemu" to check the result. It isn't
-needed to assign the usb devices to the head individually, assigning a
-usb (root) hub will automatically assign all usb devices connected to
-it too.
-
-BTW: loginctl writes udev rules to /etc/udev/rules.d to make these
-device assignments permanent, so you need to do this only once.
-
-Now simply restart gdm (rebooting will do too), and a login screen
-should show up on the second head.
+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!
When using the autoseat feature of systemd/logind we'll only need a single udev rule for the pci bridge, which simplifies the guest setup a bit. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> --- docs/multiseat.txt | 54 +++++++++++++++++++++++++++++++----------------------- 1 file changed, 31 insertions(+), 23 deletions(-)