qemu: add usbredir type 'dbus'

The USB device redirection works in a similar way as Spice. The
underlying 'dbus' channel is set to "org.qemu.usbredir" by default for
the client to identify the channel purpose (as specified in -display
dbus documentation).

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

src/conf/domain_conf.c

@@ -14411,6 +14411,8 @@ virDomainRedirdevDefParseXML(virDomainXMLOption *xmlopt,
 
     if (def->source->type == VIR_DOMAIN_CHR_TYPE_SPICEVMC)
         def->source->data.spicevmc = VIR_DOMAIN_CHR_SPICEVMC_USBREDIR;
+    if (def->source->type == VIR_DOMAIN_CHR_TYPE_DBUS && !def->source->data.dbus.channel)
+        def->source->data.dbus.channel = g_strdup("org.qemu.usbredir");
 
     if (virDomainDeviceInfoParseXML(xmlopt, node, ctxt, &def->info,
                                     flags | VIR_DOMAIN_DEF_PARSE_ALLOW_BOOT) < 0)

tests/qemuxml2argvdata/graphics-dbus-usbredir.args

@@ -0,0 +1,34 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/tmp/lib/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/tmp/lib/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/tmp/lib/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest1/.config \
+/usr/bin/qemu-system-i386 \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
+-machine pc,usb=off,dump-guest-core=off \
+-accel tcg \
+-m 214 \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot strict=on \
+-usb \
+-display dbus,p2p=on \
+-device cirrus-vga,id=video0,bus=pci.0,addr=0x2 \
+-chardev dbus,id=charredir0,name=org.qemu.usbredir \
+-device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=1 \
+-chardev dbus,id=charredir1,name=org.qemu.usbredir \
+-device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=2 \
+-msg timestamp=on

tests/qemuxml2argvdata/graphics-dbus-usbredir.xml

@@ -0,0 +1,30 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219100</memory>
+  <currentMemory unit='KiB'>219100</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-i386</emulator>
+    <controller type='usb' index='0'/>
+    <controller type='ide' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <graphics type='dbus' p2p='yes'/>
+    <redirdev bus='usb' type='dbus'/>
+    <redirdev bus='usb' type='dbus'/>
+    <video>
+      <model type='cirrus' vram='16384' heads='1'/>
+    </video>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1543,6 +1543,10 @@ mymain(void)
             QEMU_CAPS_DEVICE_ISA_SERIAL,
             QEMU_CAPS_DEVICE_CIRRUS_VGA,
             QEMU_CAPS_DISPLAY_DBUS);
+    DO_TEST("graphics-dbus-usbredir",
+            QEMU_CAPS_DEVICE_CIRRUS_VGA,
+            QEMU_CAPS_DISPLAY_DBUS,
+            QEMU_CAPS_USB_REDIR);
 
     DO_TEST_NOCAPS("input-usbmouse");
     DO_TEST_NOCAPS("input-usbtablet");