add pci-bridge-seat

Simplifies multiseat configuration, see
docs/multiseat.txt update for details.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 20 insertions, 0 deletions

diff --git a/docs/multiseat.txt b/docs/multiseat.txt
index b963665ef2..814496e94c 100644
--- a/docs/multiseat.txt
+++ b/docs/multiseat.txt
@@ -106,6 +106,25 @@ the devices attached to the seat.
 Background info is here:
   http://www.freedesktop.org/wiki/Software/systemd/multiseat/
 
+
+guest side with pci-bridge-seat
+-------------------------------
+
+Qemu version FIXME and newer has a new pci-bridge-seat device which
+can be used instead of pci-bridge.  Just swap the device name in the
+qemu command line above.  The only difference between the two devices
+is the pci id.  We can match the pci id instead of the device path
+with a nice generic rule now, which simplifies the guest
+configuration:
+
+    [root@fedora ~]# cat /etc/udev/rules.d/70-qemu-pci-bridge-seat.rules
+    SUBSYSTEM=="pci", ATTR{vendor}=="0x1b36", ATTR{device}=="0x000a", \
+            TAG+="seat", ENV{ID_AUTOSEAT}="1"
+
+Patch with this rule will be submitted to upstream udev/systemd, so
+long-term, when systemd with this lands in distros, things will work
+just fine without any manual guest configuration.
+
 Enjoy!
 
 --
diff --git a/docs/specs/pci-ids.txt b/docs/specs/pci-ids.txt
index e4a44908cb..0adcb89aac 100644
--- a/docs/specs/pci-ids.txt
+++ b/docs/specs/pci-ids.txt
@@ -47,6 +47,7 @@ PCI devices (other than virtio):
 1b36:0005  PCI test device (docs/specs/pci-testdev.txt)
 1b36:0006  PCI Rocker Ethernet switch device
 1b36:0007  PCI SD Card Host Controller Interface (SDHCI)
+1b36:000a  PCI-PCI bridge (multiseat)
 
 All these devices are documented in docs/specs.