virtio-input: add input routing support, update multiseat docs.

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Merge remote-tracking branch 'remotes/kraxel/tags/pull-input-20150703-1' into staging

virtio-input: add input routing support, update multiseat docs.

# gpg: Signature made Fri Jul  3 11:22:33 2015 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-input-20150703-1:
  update pci-bridge-seat section in docs/multiseat.txt
  virtio-input: add input routing support

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

docs/multiseat.txt

@@ -2,8 +2,8 @@
 multiseat howto (with some multihead coverage)
 ==============================================
 
-host side
+host devices
----------
+------------
 
 First you must compile qemu with a user interface supporting
 multihead/multiseat and input event routing.  Right now this
@@ -41,6 +41,19 @@ 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.
 
+Starting with qemu 2.4 and linux kernel 4.1 you can also use virtio
+for the input devices, using this ...
+
+	-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 virtio-keyboard-pci,bus=head.2,addr=03.0,display=video.2 \
+	-device virtio-tablet-pci,bus=head.2,addr=03.0,display=video.2
+
+... instead of xhci and usb hid devices.
+
+host ui
+-------
+
 The sdl2 ui will start up with two windows, one for each display
 device.  The gtk ui will start with a single window and each display
 in a separate tab.  You can either simply switch tabs to switch heads,
@@ -110,7 +123,7 @@ Background info is here:
 guest side with pci-bridge-seat
 -------------------------------
 
-Qemu version FIXME and newer has a new pci-bridge-seat device which
+Qemu version 2.4 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
@@ -121,9 +134,10 @@ configuration:
     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
+Patch with this rule has been submitted to upstream udev/systemd, was
-long-term, when systemd with this lands in distros, things will work
+accepted and and should be included in the next systemd release (222).
-just fine without any manual guest configuration.
+So, if your guest has this or a newer version, multiseat will work just
+fine without any manual guest configuration.
 
 Enjoy!
 

hw/input/virtio-input-hid.c

@@ -252,7 +252,11 @@ static void virtio_input_handle_sync(DeviceState *dev)
 static void virtio_input_hid_realize(DeviceState *dev, Error **errp)
 {
     VirtIOInputHID *vhid = VIRTIO_INPUT_HID(dev);
+
     vhid->hs = qemu_input_handler_register(dev, vhid->handler);
+    if (vhid->display && vhid->hs) {
+        qemu_input_handler_bind(vhid->hs, vhid->display, vhid->head, NULL);
+    }
 }
 
 static void virtio_input_hid_unrealize(DeviceState *dev, Error **errp)
@@ -301,10 +305,17 @@ static void virtio_input_hid_handle_status(VirtIOInput *vinput,
     }
 }
 
+static Property virtio_input_hid_properties[] = {
+    DEFINE_PROP_STRING("display", VirtIOInputHID, display),
+    DEFINE_PROP_UINT32("head", VirtIOInputHID, head, 0),
+};
+
 static void virtio_input_hid_class_init(ObjectClass *klass, void *data)
 {
+    DeviceClass *dc = DEVICE_CLASS(klass);
     VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);
 
+    dc->props          = virtio_input_hid_properties;
     vic->realize       = virtio_input_hid_realize;
     vic->unrealize     = virtio_input_hid_unrealize;
     vic->change_active = virtio_input_hid_change_active;

include/hw/virtio/virtio-input.h

@@ -95,6 +95,8 @@ struct VirtIOInputClass {
 
 struct VirtIOInputHID {
     VirtIOInput                       parent_obj;
+    char                              *display;
+    uint32_t                          head;
     QemuInputHandler                  *handler;
     QemuInputHandlerState             *hs;
     int                               ledstate;