qemu: Add support for virtio-gpu-ccw video device on S390

QEMU on S390 (since v2.11) can support the virtio-gpu-ccw device,
which can be used as a video device.

Signed-off-by: Farhan Ali <alifm@linux.vnet.ibm.com>

docs/formatdomain.html.in

@@ -6484,6 +6484,9 @@ qemu-kvm -net nic,model=? /dev/null
       <dd>
         The optional <code>address</code> sub-element can be used to
         tie the video device to a particular PCI slot.
+        On S390, <code>address</code> can be used to provide the
+        CCW address for the video device (<span class="since">
+        since 4.2.0</span>).
       </dd>
 
       <dt><code>driver</code></dt>

src/qemu/qemu_command.c

@@ -132,7 +132,7 @@ VIR_ENUM_IMPL(qemuDeviceVideoSecondary, VIR_DOMAIN_VIDEO_TYPE_LAST,
               "", /* don't support vbox */
               "qxl",
               "", /* don't support parallels */
-              "virtio-gpu-pci",
+              "virtio-gpu",
               "" /* don't support gop */);
 
 VIR_ENUM_DECL(qemuSoundCodec)
@@ -4296,7 +4296,16 @@ qemuBuildDeviceVideoStr(const virDomainDef *def,
         goto error;
     }
 
-    virBufferAsprintf(&buf, "%s,id=%s", model, video->info.alias);
+    if (STREQ(model, "virtio-gpu")) {
+        if (video->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW)
+            virBufferAsprintf(&buf, "%s-ccw", model);
+        else
+            virBufferAsprintf(&buf, "%s-pci", model);
+    } else {
+        virBufferAsprintf(&buf, "%s", model);
+    }
+
+    virBufferAsprintf(&buf, ",id=%s", video->info.alias);
 
     if (video->accel && video->accel->accel3d == VIR_TRISTATE_SWITCH_ON) {
         virBufferAsprintf(&buf, ",virgl=%s",

src/qemu/qemu_domain_address.c

@@ -287,8 +287,8 @@ qemuDomainPrimeVirtioDeviceAddresses(virDomainDefPtr def,
 {
     /*
        declare address-less virtio devices to be of address type 'type'
-       disks, networks, consoles, controllers, memballoon and rng in this
-       order
+       disks, networks, videos, consoles, controllers, memballoon and rng
+       in this order
        if type is ccw filesystem devices are declared to be of address type ccw
     */
     size_t i;
@@ -308,6 +308,14 @@ qemuDomainPrimeVirtioDeviceAddresses(virDomainDefPtr def,
         }
     }
 
+    for (i = 0; i < def->nvideos; i++) {
+        virDomainVideoDefPtr video = def->videos[i];
+
+        if (video->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE &&
+            video->type == VIR_DOMAIN_VIDEO_TYPE_VIRTIO)
+            video->info.type = type;
+    }
+
     for (i = 0; i < def->ninputs; i++) {
         if (def->inputs[i]->bus == VIR_DOMAIN_INPUT_BUS_VIRTIO &&
             def->inputs[i]->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE)

src/qemu/qemu_process.c

@@ -4778,7 +4778,10 @@ qemuProcessStartValidateVideo(virDomainObjPtr vm,
             (video->type == VIR_DOMAIN_VIDEO_TYPE_QXL &&
              !virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_QXL)) ||
             (video->type == VIR_DOMAIN_VIDEO_TYPE_VIRTIO &&
-             !virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VIRTIO_GPU))) {
+             !virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VIRTIO_GPU)) ||
+            (video->type == VIR_DOMAIN_VIDEO_TYPE_VIRTIO &&
+             video->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW &&
+             !virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VIRTIO_GPU_CCW))) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                            _("this QEMU does not support '%s' video device"),
                            virDomainVideoTypeToString(video->type));

tests/qemuxml2argvdata/video-virtio-gpu-ccw.args

@@ -0,0 +1,25 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-s390x \
+-name QEMUGuest1 \
+-S \
+-M s390-ccw-virtio \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1803 \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=readline \
+-boot c \
+-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-virtio-disk0 \
+-device virtio-blk-ccw,devno=fe.0.0000,drive=drive-virtio-disk0,\
+id=virtio-disk0 \
+-vnc 127.0.0.1:0 \
+-device virtio-gpu-ccw,id=video0,max_outputs=1,devno=fe.0.0002 \
+-device virtio-gpu-ccw,id=video1,max_outputs=1,devno=fe.0.0003 \
+-device virtio-balloon-ccw,id=balloon0,devno=fe.0.0001

tests/qemuxml2argvtest.c

@@ -3008,6 +3008,13 @@ mymain(void)
     DO_TEST("disk-many-format-probing", QEMU_CAPS_DRIVE_BOOT);
     driver.config->allowDiskFormatProbing = false;
 
+    DO_TEST("video-virtio-gpu-ccw", QEMU_CAPS_VIRTIO_CCW,
+            QEMU_CAPS_DEVICE_VIRTIO_GPU,
+            QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
+            QEMU_CAPS_VIRTIO_GPU_MAX_OUTPUTS,
+            QEMU_CAPS_VNC,
+            QEMU_CAPS_DEVICE_VIRTIO_GPU_CCW);
+
     if (getenv("LIBVIRT_SKIP_CLEANUP") == NULL)
         virFileDeleteTree(fakerootdir);