perf: 'perf kvm' tool for monitoring guest performance from host

Here is the patch of userspace perf tool.

Signed-off-by: Zhang Yanmin <yanmin_zhang@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index d4be55b..985cdb4 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -307,6 +307,7 @@
 		{ "probe",	cmd_probe,	0 },
 		{ "kmem",	cmd_kmem,	0 },
 		{ "lock",	cmd_lock,	0 },
+		{ "kvm",	cmd_kvm,	0 },
 	};
 	unsigned int i;
 	static const char ext[] = STRIP_EXTENSION;