[PATCH v3 2/7] cpu: add function to get the models for an arch

[Giuseppe Scrivano <gscrivan@xxxxxxxxxx>]

Signed-off-by: Giuseppe Scrivano <gscrivan@xxxxxxxxxx>
---
 src/cpu/cpu.c            | 56 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/cpu/cpu.h            |  3 +++
 src/libvirt_private.syms |  1 +
 3 files changed, 60 insertions(+)

diff --git a/src/cpu/cpu.c b/src/cpu/cpu.c
index 50c2de3..7011b3d 100644
--- a/src/cpu/cpu.c
+++ b/src/cpu/cpu.c
@@ -27,11 +27,13 @@
 #include "viralloc.h"
 #include "virxml.h"
 #include "cpu.h"
+#include "cpu_map.h"
 #include "cpu_x86.h"
 #include "cpu_powerpc.h"
 #include "cpu_s390.h"
 #include "cpu_arm.h"
 #include "cpu_generic.h"
+#include "util/virstring.h"
 
 
 #define NR_DRIVERS ARRAY_CARDINALITY(drivers)
@@ -456,3 +458,57 @@ cpuModelIsAllowed(const char *model,
     }
     return false;
 }
+
+struct cpuGetModelsData
+{
+    char **data;
+    size_t len;  /* It includes the last element of DATA, which is NULL. */
+};
+
+static int
+cpuGetArchModelsCb(enum cpuMapElement element,
+                   xmlXPathContextPtr ctxt,
+                   void *cbdata)
+{
+    char *name;
+    struct cpuGetModelsData *data = cbdata;
+    if (element != CPU_MAP_ELEMENT_MODEL)
+        return 0;
+
+    name = virXPathString("string(@name)", ctxt);
+    if (name == NULL)
+        return -1;
+
+    return VIR_INSERT_ELEMENT(data->data, data->len - 1, data->len, name);
+}
+
+
+static int
+cpuGetArchModels(const char *arch, struct cpuGetModelsData *data)
+{
+    return cpuMapLoad(arch, cpuGetArchModelsCb, data);
+}
+
+
+int
+cpuGetModels(const char *arch, char ***models)
+{
+    struct cpuGetModelsData data;
+
+    *models = data.data = NULL;
+    data.len = 1;
+
+    if (VIR_ALLOC_N(data.data, data.len) < 0)
+        goto error;
+
+    if (cpuGetArchModels(arch, &data) < 0)
+        goto error;
+
+    *models = data.data;
+
+    return data.len - 1;
+
+error:
+    virStringFreeList(data.data);
+    return -1;
+}
diff --git a/src/cpu/cpu.h b/src/cpu/cpu.h
index 69f6fae..ebbc7c1 100644
--- a/src/cpu/cpu.h
+++ b/src/cpu/cpu.h
@@ -175,4 +175,7 @@ cpuModelIsAllowed(const char *model,
                   const char **models,
                   unsigned int nmodels);
 
+extern int
+cpuGetModels(const char *arch, char ***models);
+
 #endif /* __VIR_CPU_H__ */
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 35f0f1b..b456c2d 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -719,6 +719,7 @@ cpuCompareXML;
 cpuDataFree;
 cpuDecode;
 cpuEncode;
+cpuGetModels;
 cpuGuestData;
 cpuHasFeature;
 cpuMapOverride;
-- 
1.8.3.1

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