[libvirt] [PATCH v2 23/31] qemu: Introduce virQEMUCapsGetMachineDefaultCPU

[Jiri Denemark]

Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
---

Notes:
    Version 2:
    - fix crash with CPUs without type

 src/qemu/qemu_capabilities.c | 36 ++++++++++++++++++++++++++++++++++++
 src/qemu/qemu_capabilities.h |  3 +++
 2 files changed, 39 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 33cd3491b2..dd7ea9ae86 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -2179,6 +2179,42 @@ bool virQEMUCapsGetMachineHotplugCpus(virQEMUCapsPtr qemuCaps,
 }
 
 
+const char *
+virQEMUCapsGetMachineDefaultCPU(virQEMUCapsPtr qemuCaps,
+                                const char *name,
+                                virDomainVirtType type)
+{
+    qemuMonitorCPUDefsPtr defs;
+    const char *cpuType = NULL;
+    size_t i;
+
+    if (type == VIR_DOMAIN_VIRT_KVM)
+        defs = qemuCaps->kvmCPUModels;
+    else
+        defs = qemuCaps->tcgCPUModels;
+
+    if (!name || !defs)
+        return NULL;
+
+    for (i = 0; i < qemuCaps->nmachineTypes; i++) {
+        if (STREQ(qemuCaps->machineTypes[i].name, name)) {
+            cpuType = qemuCaps->machineTypes[i].defaultCPU;
+            break;
+        }
+    }
+
+    if (!cpuType)
+        return NULL;
+
+    for (i = 0; i < defs->ncpus; i++) {
+        if (STREQ_NULLABLE(defs->cpus[i].type, cpuType))
+            return defs->cpus[i].name;
+    }
+
+    return NULL;
+}
+
+
 /**
  * virQEMUCapsSetGICCapabilities:
  * @qemuCaps: QEMU capabilities
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 923706c3bf..f5133d083d 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -607,6 +607,9 @@ int virQEMUCapsGetMachineMaxCpus(virQEMUCapsPtr qemuCaps,
                                  const char *name);
 bool virQEMUCapsGetMachineHotplugCpus(virQEMUCapsPtr qemuCaps,
                                       const char *name);
+const char *virQEMUCapsGetMachineDefaultCPU(virQEMUCapsPtr qemuCaps,
+                                            const char *name,
+                                            virDomainVirtType type);
 int virQEMUCapsGetMachineTypesCaps(virQEMUCapsPtr qemuCaps,
                                    size_t *nmachines,
                                    virCapsGuestMachinePtr **machines);
-- 
2.23.0