qemu: add ', share=<policy>' to qemu commandline

example: qemu ${otherargs} \
             -vnc 127.0.0.1:0,share=allow-exclusive

src/qemu/qemu_command.c

@@ -6099,6 +6099,19 @@ qemuBuildGraphicsVNCCommandLine(virQEMUDriverConfigPtr cfg,
                 virBufferAsprintf(&opt, ",websocket=%d", graphics->data.vnc.websocket);
             }
 
+        if (graphics->data.vnc.sharePolicy) {
+            if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VNC_SHARE_POLICY)) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("vnc display sharing policy is not "
+                                 "supported with this QEMU"));
+                goto error;
+            }
+
+            virBufferAsprintf(&opt, ",share=%s",
+                              virDomainGraphicsVNCSharePolicyTypeToString(
+                              graphics->data.vnc.sharePolicy));
+        }
+
         if (graphics->data.vnc.auth.passwd || cfg->vncPassword)
             virBufferAddLit(&opt, ",password");
 
@@ -10030,6 +10043,29 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr qemuCaps,
                                 vnc->data.vnc.websocket =
                                     vnc->data.vnc.port + 5700;
                             }
+                        } else if (STRPREFIX(opts, "share=")) {
+                            char *sharePolicy = opts + strlen("share=");
+                            if (sharePolicy && *sharePolicy) {
+                                int policy =
+                                    virDomainGraphicsVNCSharePolicyTypeFromString(sharePolicy);
+
+                                if (policy < 0) {
+                                    virReportError(VIR_ERR_INTERNAL_ERROR,
+                                                   _("unknown vnc display sharing policy '%s'"),
+                                                     sharePolicy);
+                                    virDomainGraphicsDefFree(vnc);
+                                    VIR_FREE(orig_opts);
+                                    goto error;
+                                } else {
+                                    vnc->data.vnc.sharePolicy = policy;
+                                }
+                            } else {
+                                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                                               _("missing vnc sharing policy"));
+                                virDomainGraphicsDefFree(vnc);
+                                VIR_FREE(orig_opts);
+                                goto error;
+                            }
                         }
 
                         opts = nextopt;

tests/qemuargv2xmltest.c

@@ -201,6 +201,7 @@ mymain(void)
     DO_TEST("graphics-vnc");
     DO_TEST("graphics-vnc-socket");
     DO_TEST("graphics-vnc-websocket");
+    DO_TEST("graphics-vnc-policy");
 
     DO_TEST("graphics-vnc-sasl");
     DO_TEST("graphics-vnc-tls");

tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-policy.args

+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
+/usr/bin/qemu -S -M pc -m 214 -smp 1 -monitor unix:/tmp/test-monitor,server,nowait \
+-no-acpi -boot c -usb -hda /dev/HostVG/QEMUGuest1 \
+-net none -serial none -parallel none -vnc 127.0.0.1:0,share=allow-exclusive

tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-policy.xml

+<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>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='ide' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <graphics type='vnc' port='5900' autoport='no' listen='127.0.0.1' sharePolicy='allow-exclusive'>
+      <listen type='address' address='127.0.0.1'/>
+    </graphics>
+    <video>
+      <model type='cirrus' vram='9216' heads='1'/>
+    </video>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -610,6 +610,7 @@ mymain(void)
     DO_TEST("graphics-vnc", QEMU_CAPS_VNC);
     DO_TEST("graphics-vnc-socket", QEMU_CAPS_VNC);
     DO_TEST("graphics-vnc-websocket", QEMU_CAPS_VNC, QEMU_CAPS_VNC_WEBSOCKET);
+    DO_TEST("graphics-vnc-policy", QEMU_CAPS_VNC, QEMU_CAPS_VNC_SHARE_POLICY);
 
     driver.config->vncSASL = 1;
     VIR_FREE(driver.config->vncSASLdir);