[PATCH 037/103] qemuDeviceVideoGetModel: Clarify 'virtio' argument

[Peter Krempa]

The 'virito' argument was misleadingly implying that it's true for all
virtio devices, but that's not the case. 'virtio-vga(-gl)' is a virtio
device but doesn't accept the usual bus-dependant suffix.

Add a comment for 'qemuDeviceVideoGetModel' and another boolean
'virtioBusSuffix' which carries the above meaning so that the 'virtio'
argument can be fixed (it will be used later).

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_command.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index f185e3a53c..3c468ab0a4 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4291,16 +4291,28 @@ qemuBuildSoundCommandLine(virCommand *cmd,
 }


+/**
+ * qemuDeviceVideoGetModel:
+ * @qemuCaps: qemu capabilities
+ * @video: video device definition
+ * @virtio: the returned video device is a 'virtio' device
+ * @virtioBusSuffix: the returned device needs to get the bus-suffix
+ *
+ * Returns the model fo the device for @video and @qemuCaps. @virtio and
+ * @virtioBusSuffix are filled with the corresponding flags.
+ */
 static const char *
 qemuDeviceVideoGetModel(virQEMUCaps *qemuCaps,
                         const virDomainVideoDef *video,
-                        bool *virtio)
+                        bool *virtio,
+                        bool *virtioBusSuffix)
 {
     const char *model = NULL;
     bool primaryVga = false;
     virTristateSwitch accel3d = VIR_TRISTATE_SWITCH_ABSENT;

     *virtio = false;
+    *virtioBusSuffix = false;

     if (video->accel)
         accel3d = video->accel->accel3d;
@@ -4318,6 +4330,7 @@ qemuDeviceVideoGetModel(virQEMUCaps *qemuCaps,
         } else {
             model = "vhost-user-gpu";
             *virtio = true;
+            *virtioBusSuffix = true;
         }
     } else {
         if (primaryVga) {
@@ -4340,6 +4353,9 @@ qemuDeviceVideoGetModel(virQEMUCaps *qemuCaps,
                     model = "virtio-vga-gl";
                 else
                     model = "virtio-vga";
+
+                *virtio = true;
+                *virtioBusSuffix = false;
                 break;
             case VIR_DOMAIN_VIDEO_TYPE_BOCHS:
                 model = "bochs-display";
@@ -4367,7 +4383,9 @@ qemuDeviceVideoGetModel(virQEMUCaps *qemuCaps,
                     model = "virtio-gpu-gl";
                 else
                     model = "virtio-gpu";
+
                 *virtio = true;
+                *virtioBusSuffix = true;
                 break;
             case VIR_DOMAIN_VIDEO_TYPE_DEFAULT:
             case VIR_DOMAIN_VIDEO_TYPE_VGA:
@@ -4406,14 +4424,15 @@ qemuBuildDeviceVideoStr(const virDomainDef *def,
     const char *model = NULL;
     virTristateSwitch accel3d = VIR_TRISTATE_SWITCH_ABSENT;
     bool virtio = false;
+    bool virtioBusSuffix = false;

     if (video->accel)
         accel3d = video->accel->accel3d;

-    if (!(model = qemuDeviceVideoGetModel(qemuCaps, video, &virtio)))
+    if (!(model = qemuDeviceVideoGetModel(qemuCaps, video, &virtio, &virtioBusSuffix)))
         return NULL;

-    if (virtio) {
+    if (virtioBusSuffix) {
         if (qemuBuildVirtioDevStr(&buf, model, qemuCaps,
                                   VIR_DOMAIN_DEVICE_VIDEO, video) < 0) {
             return NULL;
-- 
2.31.1