qemu: introduce spiceport chardev backend

Add a new backend for any character device.  This backend uses channel
in spice connection.  This channel is similar to spicevmc, but
all-purpose in contrast to spicevmc.

Apart from spicevmc, spiceport-backed chardev will not be formatted
into the command-line if there is no spice to use (with test for that
as well).  For this I moved the def->graphics counting to the start
of the function so its results can be used in rest of the code even in
the future.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>

tests/qemuxml2argvdata/qemuxml2argv-serial-spiceport-nospice.args

@@ -0,0 +1,6 @@
+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 -nographic -monitor \
+unix:/tmp/test-monitor,server,nowait -no-acpi -boot c \
+-usb -hda /dev/HostVG/QEMUGuest1 -net none -serial \
+none -parallel none

tests/qemuxml2argvdata/qemuxml2argv-serial-spiceport-nospice.xml

@@ -0,0 +1,35 @@
+<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'>
+      <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'/>
+    <serial type='spiceport'>
+      <source channel='org.qemu.console.serial.0'/>
+      <target port='0'/>
+    </serial>
+    <console type='spiceport'>
+      <source channel='org.qemu.console.serial.0'/>
+      <target type='serial' port='0'/>
+    </console>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-serial-spiceport.args

@@ -0,0 +1,13 @@
+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 -nodefconfig -nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/test-monitor,server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=readline \
+-no-acpi -boot c -usb \
+-hda /dev/HostVG/QEMUGuest1 \
+-chardev spiceport,id=charserial0,name=org.qemu.console.serial.0 \
+-device isa-serial,chardev=charserial0,id=serial0 \
+-device usb-tablet,id=input0 \
+-spice port=5903,tls-port=5904,addr=127.0.0.1,x509-dir=/etc/pki/libvirt-spice \
+-device \
+qxl-vga,id=video0,ram_size=67107840,vram_size=67107840,bus=pci.0,addr=0x2 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

tests/qemuxml2argvdata/qemuxml2argv-serial-spiceport.xml

@@ -0,0 +1,43 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static' cpuset='1-4,8-20,525'>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'>
+      <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'/>
+    <serial type='spiceport'>
+      <source channel='org.qemu.console.serial.0'/>
+      <target port='0'/>
+    </serial>
+    <console type='spiceport'>
+      <source channel='org.qemu.console.serial.0'/>
+      <target type='serial' port='0'/>
+    </console>
+    <input type='tablet' bus='usb'/>
+    <input type='mouse' bus='ps2'/>
+    <graphics type='spice' port='5903' tlsPort='5904' autoport='no' listen='127.0.0.1'>
+      <listen type='address' address='127.0.0.1'/>
+    </graphics>
+    <video>
+      <model type='qxl' ram='65535' vram='65535' heads='1'/>
+    </video>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>