[libvirt] [PATCH 1/3] qemu: record the QEMU default machine in capabilities

[Daniel P. Berrangé]

We don't honour the QEMU default machine type anymore, always using the
libvirt chosen default instead. The QEMU argv parser, however, will need
to know the exacty QEMU default, so we must record that info.

Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
---
 src/qemu/qemu_capabilities.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index e6e199b2c6..a0a1b97f1d 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -515,6 +515,7 @@ struct virQEMUCapsMachineType {
     char *alias;
     unsigned int maxCpus;
     bool hotplugCpus;
+    bool qemuDefault;
 };
 
 typedef struct _virQEMUCapsHostCPUData virQEMUCapsHostCPUData;
@@ -2324,8 +2325,10 @@ virQEMUCapsProbeQMPMachineTypes(virQEMUCapsPtr qemuCaps,
             preferredIdx = qemuCaps->nmachineTypes - 1;
         }
 
-        if (machines[i]->isDefault)
+        if (machines[i]->isDefault) {
+            mach->qemuDefault = true;
             defIdx = qemuCaps->nmachineTypes - 1;
+        }
     }
 
     /*
@@ -3355,7 +3358,7 @@ virQEMUCapsCachePrivFree(void *privData)
  *   ...
  *   <cpu name="pentium3"/>
  *   ...
- *   <machine name="pc-1.0" alias="pc" hotplugCpus='yes' maxCpus="4"/>
+ *   <machine name="pc-1.0" alias="pc" hotplugCpus='yes' maxCpus="4" default="yes"/>
  *   ...
  * </qemuCaps>
  */
@@ -3520,6 +3523,11 @@ virQEMUCapsLoadCache(virArch hostArch,
             if (STREQ_NULLABLE(str, "yes"))
                 qemuCaps->machineTypes[i].hotplugCpus = true;
             VIR_FREE(str);
+
+            str = virXMLPropString(nodes[i], "default");
+            if (STREQ_NULLABLE(str, "yes"))
+                qemuCaps->machineTypes[i].qemuDefault = true;
+            VIR_FREE(str);
         }
     }
     VIR_FREE(nodes);
@@ -3768,6 +3776,8 @@ virQEMUCapsFormatCache(virQEMUCapsPtr qemuCaps)
                               qemuCaps->machineTypes[i].alias);
         if (qemuCaps->machineTypes[i].hotplugCpus)
             virBufferAddLit(&buf, " hotplugCpus='yes'");
+        if (qemuCaps->machineTypes[i].qemuDefault)
+            virBufferAddLit(&buf, " default='yes'");
         virBufferAsprintf(&buf, " maxCpus='%u'/>\n",
                           qemuCaps->machineTypes[i].maxCpus);
     }
-- 
2.17.1