linux-kernel - [PATCH 1/3] trace-cmd: Report unknown VMX exit reasons with code

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Date:	Sat,  4 Jan 2014 18:19:48 +0100
From:	Jan Kiszka <jan.kiszka@....de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-trace-users@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>
Subject: [PATCH 1/3] trace-cmd: Report unknown VMX exit reasons with code

From: Jan Kiszka <jan.kiszka@...mens.com>

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

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 plugin_kvm.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/plugin_kvm.c b/plugin_kvm.c
index 8a25cf1..59443e5 100644
--- a/plugin_kvm.c
+++ b/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);
 
-- 
1.8.1.1.298.ge7eed54

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