tools lib traceevent: Report unknown VMX exit reasons with code

Allows to parse the result even if the KVM plugin does not yet
understand a specific exit code.

Link: http://lkml.kernel.org/r/5207446F.1090703@web.de

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/tools/lib/traceevent/plugin_kvm.c b/tools/lib/traceevent/plugin_kvm.c
index 9e0e8c61b43b..3e6122067d67 100644
--- a/tools/lib/traceevent/plugin_kvm.c
+++ b/tools/lib/traceevent/plugin_kvm.c
@@ -240,9 +240,8 @@ static const char *find_exit_reason(unsigned isa, int val)
         for (i = 0; strings[i].val >= 0; i++)
                 if (strings[i].val == val)
                         break;
-        if (strings[i].str)
-                return strings[i].str;
-        return "UNKNOWN";
+
+        return strings[i].str;
 }
 
 static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
@@ -251,6 +250,7 @@ static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
         unsigned long long isa;
         unsigned long long val;
         unsigned long long info1 = 0, info2 = 0;
+        const char *reason;
 
         if (pevent_get_field_val(s, event, "exit_reason", record, &val, 1) < 0)
                 return -1;
@@ -258,7 +258,11 @@ static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
         if (pevent_get_field_val(s, event, "isa", record, &isa, 0) < 0)
                 isa = 1;
 
-        trace_seq_printf(s, "reason %s", find_exit_reason(isa, val));
+        reason = find_exit_reason(isa, val);
+        if (reason)
+                trace_seq_printf(s, "reason %s", reason);
+        else
+                trace_seq_printf(s, "reason UNKNOWN (%llu)", val);
 
         pevent_print_num_field(s, " rip 0x%lx", event, "guest_rip", record, 1);