[Qemu-devel] [PATCH 4/6] qapi: change the type of TargetInfo.arch from string to enum SysEmuTarget

[Laszlo Ersek <lersek@redhat.com>]

Now that we have @SysEmuTarget, it makes sense to restict
@TargetInfo.@arch to valid sysemu targets at the schema level.

Cc: "Daniel P. Berrange" <berrange@redhat.com>
Cc: David Gibson <dgibson@redhat.com>
Cc: Eric Blake <eblake@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Kashyap Chamarthy <kchamart@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Thomas Huth <thuth@redhat.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---

Notes:
    PATCHv1:
    
    - qmp_query_target(): pass (-1) as fallback value [Markus]
    - qmp_query_target(): catch lookup error with error_abort [Markus]
    
    RFCv3:
    
    - The patch is new in this version. [Markus]

 qapi/misc.json |  6 ++++--
 arch_init.c    | 10 +++++++++-
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/qapi/misc.json b/qapi/misc.json
index 104d013adba6..460866cf542f 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -1,18 +1,20 @@
 # -*- Mode: Python -*-
 #
 
 ##
 # = Miscellanea
 ##
 
+{ 'include': 'common.json' }
+
 ##
 # @qmp_capabilities:
 #
 # Enable QMP capabilities.
 #
 # Arguments:
 #
 # @enable:   An optional list of QMPCapability values to enable.  The
 #            client must not enable any capability that is not
 #            mentioned in the QMP greeting message.  If the field is not
 #            provided, it means no QMP capabilities will be enabled.
@@ -2441,28 +2443,28 @@
 #      ]
 #    }
 #
 ##
 { 'command': 'query-fdsets', 'returns': ['FdsetInfo'] }
 
 ##
 # @TargetInfo:
 #
 # Information describing the QEMU target.
 #
-# @arch: the target architecture (eg "x86_64", "i386", etc)
+# @arch: the target architecture
 #
 # Since: 1.2.0
 ##
 { 'struct': 'TargetInfo',
-  'data': { 'arch': 'str' } }
+  'data': { 'arch': 'SysEmuTarget' } }
 
 ##
 # @query-target:
 #
 # Return information about the target for this QEMU
 #
 # Returns: TargetInfo
 #
 # Since: 1.2.0
 ##
 { 'command': 'query-target', 'returns': 'TargetInfo' }
diff --git a/arch_init.c b/arch_init.c
index 6ee07478bd11..ee3a57019000 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -21,22 +21,23 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "cpu.h"
 #include "sysemu/sysemu.h"
 #include "sysemu/arch_init.h"
 #include "hw/pci/pci.h"
 #include "hw/audio/soundhw.h"
 #include "qapi/qapi-commands-misc.h"
+#include "qapi/error.h"
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
 #include "hw/acpi/acpi.h"
 #include "qemu/help_option.h"
 
 #ifdef TARGET_SPARC
 int graphic_width = 1024;
 int graphic_height = 768;
 int graphic_depth = 8;
 #else
 int graphic_width = 800;
@@ -104,15 +105,22 @@ int xen_available(void)
     return 1;
 #else
     return 0;
 #endif
 }
 
 
 TargetInfo *qmp_query_target(Error **errp)
 {
     TargetInfo *info = g_malloc0(sizeof(*info));
 
-    info->arch = g_strdup(TARGET_NAME);
+    /*
+     * The fallback enum value is irrelevant here (TARGET_NAME is a
+     * macro and can never be NULL), so simply pass (-1). Also, the
+     * lookup should never fail -- if it fails, then @SysEmuTarget needs
+     * extending. Catch that with "error_abort".
+     */
+    info->arch = qapi_enum_parse(&SysEmuTarget_lookup, TARGET_NAME, -1,
+                                 &error_abort);
 
     return info;
 }
-- 
2.14.1.3.gb7cf6e02401b