qemu: Pass the number of heads even with -vga qxl

When added in multiple previous commits, it was used only with -device
qxl(-vga), but for some QEMUs (< 1.6) we need to add this
functionality when using -vga qxl as well.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1283207

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

src/qemu/qemu_command.c

@@ -4590,6 +4590,7 @@ qemuBuildVgaVideoCommand(virCommandPtr cmd,
         unsigned int vram = video->vram;
         unsigned int vram64 = video->vram64;
         unsigned int vgamem = video->vgamem;
+        unsigned int heads = video->heads;
 
         if (ram) {
             virCommandAddArg(cmd, "-global");
@@ -4613,6 +4614,12 @@ qemuBuildVgaVideoCommand(virCommandPtr cmd,
             virCommandAddArgFormat(cmd, "%s.vgamem_mb=%u",
                                    dev, vgamem / 1024);
         }
+        if (heads &&
+            virQEMUCapsGet(qemuCaps, QEMU_CAPS_QXL_MAX_OUTPUTS)) {
+            virCommandAddArg(cmd, "-global");
+            virCommandAddArgFormat(cmd, "%s.max_outputs=%u",
+                                   dev, heads);
+        }
     }
 
     if (video->vram &&

tests/qemuxml2argvdata/qemuxml2argv-video-vga-qxl-heads.args

@@ -0,0 +1,30 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-i686 \
+-name QEMUGuest1 \
+-S \
+-M pc \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-QEMUGuest1/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
+-vga qxl \
+-global qxl-vga.ram_size=67108864 \
+-global qxl-vga.vram_size=67108864 \
+-global qxl-vga.max_outputs=1 \
+-device qxl,id=video1,ram_size=67108864,vram_size=33554432,max_outputs=3,\
+bus=pci.0,addr=0x4 \
+-device qxl,id=video2,ram_size=67108864,vram_size=67108864,max_outputs=7,\
+bus=pci.0,addr=0x5 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

tests/qemuxml2argvdata/qemuxml2argv-video-vga-qxl-heads.xml

@@ -0,0 +1,47 @@
+<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'>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-i686</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'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+    </controller>
+    <controller type='ide' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <video>
+      <model type='qxl' ram='65536' vram='32768' vgamem='8192' heads='3'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
+    </video>
+    <video>
+      <model type='qxl' ram='65536' vram='65536' vgamem='8192' heads='7'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
+    </video>
+    <video>
+      <model type='qxl' ram='65536' vram='65536' vgamem='8192' heads='1' primary='yes'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
+    </video>
+    <memballoon model='virtio'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </memballoon>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1735,6 +1735,9 @@ mymain(void)
             QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
             QEMU_CAPS_DEVICE_QXL,
             QEMU_CAPS_QXL_MAX_OUTPUTS);
+    DO_TEST("video-vga-qxl-heads",
+            QEMU_CAPS_DEVICE_QXL,
+            QEMU_CAPS_QXL_MAX_OUTPUTS);
     DO_TEST("video-qxl-noheads",
             QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
             QEMU_CAPS_DEVICE_QXL,