vnc: add support for listen type none

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>

docs/formatdomain.html.in

@@ -5384,7 +5384,8 @@ qemu-kvm -net nic,model=? /dev/null
           virDomainOpenGraphicsFD(). No other listen types are allowed if this
           one is used and the graphics device doesn't listen anywhere. You need
           to use one of the two APIs to pass a FD to QEMU in order to connect to
-          this graphics device. Supported by graphics type <code>spice</code>.
+          this graphics device. Supported by graphics type <code>vnc</code> and
+          <code>spice</code>.
         </p>
       </dd>
     </dl>

src/conf/domain_conf.c

@@ -10982,7 +10982,8 @@ virDomainGraphicsListenDefParseXML(virDomainGraphicsListenDefPtr def,
         }
         break;
     case VIR_DOMAIN_GRAPHICS_LISTEN_TYPE_NONE:
-        if (graphics->type != VIR_DOMAIN_GRAPHICS_TYPE_SPICE) {
+        if (graphics->type != VIR_DOMAIN_GRAPHICS_TYPE_SPICE &&
+            graphics->type != VIR_DOMAIN_GRAPHICS_TYPE_VNC) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                            _("listen type 'none' is not available for "
                              "graphics type '%s'"), graphicsType);

src/qemu/qemu_command.c

@@ -7268,6 +7268,9 @@ qemuBuildGraphicsVNCCommandLine(virQEMUDriverConfigPtr cfg,
         break;
 
     case VIR_DOMAIN_GRAPHICS_LISTEN_TYPE_NONE:
+        virBufferAddLit(&opt, "none");
+        break;
+
     case VIR_DOMAIN_GRAPHICS_LISTEN_TYPE_LAST:
         break;
     }

tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-none.args

@@ -0,0 +1,20 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu \
+-name QEMUGuest1 \
+-S \
+-M pc \
+-m 214 \
+-smp 1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-QEMUGuest1/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-vnc none \
+-vga cirrus

tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-none.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</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='vnc'>
+      <listen type='none'/>
+    </graphics>
+    <video>
+      <model type='cirrus' vram='16384' heads='1'/>
+    </video>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -903,6 +903,7 @@ mymain(void)
     driver.config->vncAutoUnixSocket = false;
     DO_TEST("graphics-vnc-socket", QEMU_CAPS_VNC);
     DO_TEST("graphics-vnc-auto-socket", QEMU_CAPS_VNC);
+    DO_TEST("graphics-vnc-none", QEMU_CAPS_VNC);
 
     driver.config->vncSASL = 1;
     VIR_FREE(driver.config->vncSASLdir);