qapi: add 'query-target' command to return target arch

Add a 'query-target' QAPI command to allow management applications
to determine what target architecture a QEMU binary is emulating
without having to parse the binary name or -help output

  $ qmp-shell -p /tmp/qemu
  (QEMU) query-target
  {   u'return': {   u'arch': u'x86_64' }}

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/qapi-schema.json b/qapi-schema.json
index 3d2b2d1..72b3c4d 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2454,3 +2454,42 @@
 #
 ##
 { 'command': 'query-fdsets', 'returns': ['FdsetInfo'] }
+
+##
+# @TargetType
+#
+# Target CPU emulation type
+#
+# These parameters correspond to the softmmu binary CPU name that is currently
+# running.
+#
+# Since: 1.2.0
+##
+{ 'enum': 'TargetType',
+  'data': [ 'alpha', 'arm', 'cris', 'i386', 'lm32', 'm68k', 'microblazeel',
+            'microblaze', 'mips64el', 'mips64', 'mipsel', 'mips', 'or32',
+            'ppc64', 'ppcemb', 'ppc', 's390x', 'sh4eb', 'sh4', 'sparc64',
+            'sparc', 'unicore32', 'x86_64', 'xtensaeb', 'xtensa' ] }
+
+##
+# @TargetInfo:
+#
+# Information describing the QEMU target.
+#
+# @arch: the target architecture (eg "x86_64", "i386", etc)
+#
+# Since: 1.2.0
+##
+{ 'type': 'TargetInfo',
+  'data': { 'arch': 'TargetType' } }
+
+##
+# @query-target:
+#
+# Return information about the target for this QEMU
+#
+# Returns: TargetInfo
+#
+# Since: 1.2.0
+##
+{ 'command': 'query-target', 'returns': 'TargetInfo' }