Implement QEMU/KVM support for SPICE graphics

This supports the -spice argument posted for review against
the latest upstream QEMU/KVM. This supports the bare minimum
config with port, TLS port & listen address. The x509 bits are
added in a later patch.

* src/qemu_conf.c, src/qemu_conf.h: Add SPICE flag. Check for
  -spice availability. Format -spice arg for command line
* qemuhelptest.c: Add SPICE flag
* qemuxml2argvdata/qemuxml2argv-graphics-spice.args: Add <graphics>
  for spice
* qemuxml2argvdata/qemuxml2argv-graphics-spice.xml: Add -spice arg
* qemuxml2argvtest.c: Add SPICE flag

src/qemu/qemu_conf.c

@@ -1208,6 +1208,8 @@ static unsigned long long qemudComputeCmdFlags(const char *help,
         if (strstr(help, "|qxl"))
             flags |= QEMUD_CMD_FLAG_VGA_QXL;
     }
+    if (strstr(help, "-spice"))
+        flags |= QEMUD_CMD_FLAG_SPICE;
     if (strstr(help, "boot=on"))
         flags |= QEMUD_CMD_FLAG_DRIVE_BOOT;
     if (strstr(help, "serial=s"))
@@ -5067,6 +5069,41 @@ int qemudBuildCommandLine(virConnectPtr conn,
         if (qemuCmdFlags & QEMUD_CMD_FLAG_SDL)
             ADD_ARG_LIT("-sdl");
 
+    } else if ((def->ngraphics == 1) &&
+               def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE) {
+        virBuffer opt = VIR_BUFFER_INITIALIZER;
+        char *optstr;
+
+        if (!(qemuCmdFlags & QEMUD_CMD_FLAG_SPICE)) {
+            qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                            _("spice graphics are not supported with this QEMU"));
+            goto error;
+        }
+
+        virBufferVSprintf(&opt, "port=%u", def->graphics[0]->data.spice.port);
+
+        if (def->graphics[0]->data.spice.tlsPort)
+            virBufferVSprintf(&opt, ",tls-port=%u", def->graphics[0]->data.spice.tlsPort);
+
+        if (def->graphics[0]->data.spice.listenAddr)
+            virBufferVSprintf(&opt, ",addr=%s", def->graphics[0]->data.spice.listenAddr);
+
+        if (virBufferError(&opt))
+            goto no_memory;
+
+        optstr = virBufferContentAndReset(&opt);
+
+        ADD_ARG_LIT("-spice");
+        ADD_ARG(optstr);
+        if (def->graphics[0]->data.spice.keymap) {
+            ADD_ARG_LIT("-k");
+            ADD_ARG_LIT(def->graphics[0]->data.spice.keymap);
+        }
+        /* SPICE includes native support for tunnelling audio, so we
+         * set the audio backend to point at SPICE's own driver
+         */
+        ADD_ENV_LIT("QEMU_AUDIO_DRV=spice");
+
     } else if ((def->ngraphics == 1)) {
         qemuReportError(VIR_ERR_INTERNAL_ERROR,
                     _("unsupported graphics type '%s'"),

src/qemu/qemu_conf.h

@@ -99,6 +99,7 @@ enum qemud_cmd_flags {
     QEMUD_CMD_FLAG_DRIVE_READONLY= (1LL << 43), /* -drive readonly=on|off */
     QEMUD_CMD_FLAG_SMBIOS_TYPE   = (1LL << 44), /* Is -smbios type= available */
     QEMUD_CMD_FLAG_VGA_QXL       = (1LL << 45), /* The 'qxl' arg for '-vga' */
+    QEMUD_CMD_FLAG_SPICE         = (1LL << 46), /* Is -spice avail */
 };
 
 /* Main driver state */

tests/qemuxml2argvdata/qemuxml2argv-graphics-spice.args

-LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -nodefaults -monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -hda /dev/HostVG/QEMUGuest1 -usb -vga qxl -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=spice /usr/bin/qemu -S -M pc -m 214 -smp 1 -nodefaults -monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -hda /dev/HostVG/QEMUGuest1 -usb -spice port=5903,tls-port=5904,addr=127.0.0.1 -vga qxl -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

tests/qemuxml2argvdata/qemuxml2argv-graphics-spice.xml

@@ -20,6 +20,8 @@
       <address type='drive' controller='0' bus='0' unit='0'/>
     </disk>
     <controller type='ide' index='0'/>
+    <input type='mouse' bus='ps2'/>
+    <graphics type='spice' port='5903' tlsPort='5904' autoport='no' listen='127.0.0.1'/>
     <video>
       <model type='qxl' vram='65536' heads='1'/>
     </video>

tests/qemuxml2argvtest.c

@@ -325,7 +325,7 @@ mymain(int argc, char **argv)
     DO_TEST("nographics-vga", QEMUD_CMD_FLAG_VGA, false);
     DO_TEST("graphics-spice",
             QEMUD_CMD_FLAG_VGA | QEMUD_CMD_FLAG_VGA_QXL |
-            QEMUD_CMD_FLAG_DEVICE, false);
+            QEMUD_CMD_FLAG_DEVICE | QEMUD_CMD_FLAG_SPICE, false);
 
     DO_TEST("input-usbmouse", 0, false);
     DO_TEST("input-usbtablet", 0, false);