[PATCH 2/3] libxl: introduce libxl__qmp_query_cpus

[Wei Liu <wei.liu2@citrix.com>]

It interrogates QEMU for the number of cpus.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
 tools/libxl/libxl_internal.h |  3 +++
 tools/libxl/libxl_qmp.c      | 19 +++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 38ec54d..5c22b97 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -1794,6 +1794,9 @@ _hidden int libxl__qmp_set_global_dirty_log(libxl__gc *gc, int domid, bool enabl
 _hidden int libxl__qmp_insert_cdrom(libxl__gc *gc, int domid, const libxl_device_disk *disk);
 /* Add a virtual CPU */
 _hidden int libxl__qmp_cpu_add(libxl__gc *gc, int domid, int index);
+/* Query the number of CPUs */
+_hidden int libxl__qmp_query_cpus(libxl__gc *gc, int domid,
+                                  unsigned int *count);
 /* Start NBD server */
 _hidden int libxl__qmp_nbd_server_start(libxl__gc *gc, int domid,
                                         const char *host, const char *port);
diff --git a/tools/libxl/libxl_qmp.c b/tools/libxl/libxl_qmp.c
index 3eb279a..b9de867 100644
--- a/tools/libxl/libxl_qmp.c
+++ b/tools/libxl/libxl_qmp.c
@@ -979,6 +979,25 @@ int libxl__qmp_cpu_add(libxl__gc *gc, int domid, int idx)
     return qmp_run_command(gc, domid, "cpu-add", args, NULL, NULL);
 }
 
+static int query_cpus_callback(libxl__qmp_handler *qmp,
+                               const libxl__json_object *response,
+                               void *opaque)
+{
+    unsigned int *count = opaque;
+    GC_INIT(qmp->ctx);
+
+    *count = libxl__json_array_count(response);
+
+    GC_FREE;
+    return 0;
+}
+
+int libxl__qmp_query_cpus(libxl__gc *gc, int domid, unsigned int *count)
+{
+    return qmp_run_command(gc, domid, "query-cpus", NULL,
+                           query_cpus_callback, count);
+}
+
 int libxl__qmp_nbd_server_start(libxl__gc *gc, int domid,
                                 const char *host, const char *port)
 {
-- 
2.1.4


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