Adding is_writable_pte print helper function, so the
kvmmmu:fast_page_fault print format gets resolved properly.
The diff of 'perf script' output generated by old and new code:
(data was generated by 'perf record -e 'kvm:*,kvmmmu:*' -a')
--- script.kvm.old
+++ script.kvm.new
- qemu-system-x86 3290 [002] 10708.755312: kvmmmu:fast_page_fault: [FAILED
TO PARSE] vcpu_id=0 gva=4094486080 error_code=3 sptep=0xffff88019f1e3670
old_spte=336391285 new_spte=336391287 retry=1
+ qemu-system-x86 3290 [002] 10708.755312: kvmmmu:fast_page_fault: vcpu 0
gva f40ce640 error_code P|W sptep 0xffff88019f1e3670 old 0x140cec75 new
140cec77 spurious 0 fixed 1
Signed-off-by: Jiri Olsa <jo...@redhat.com>
Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@elte.hu>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Arnaldo Carvalho de Melo <a...@ghostprotocols.net>
Cc: Steven Rostedt <rost...@goodmis.org>
Cc: David Ahern <dsah...@gmail.com>
---
tools/lib/traceevent/plugin_kvm.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/tools/lib/traceevent/plugin_kvm.c
b/tools/lib/traceevent/plugin_kvm.c
index be9d9c6..a0e282c 100644
--- a/tools/lib/traceevent/plugin_kvm.c
+++ b/tools/lib/traceevent/plugin_kvm.c
@@ -389,6 +389,16 @@ static int kvm_mmu_get_page_handler(struct trace_seq *s,
return kvm_mmu_print_role(s, record, event, context);
}
+#define PT_WRITABLE_SHIFT 1
+#define PT_WRITABLE_MASK (1ULL << PT_WRITABLE_SHIFT)
+
+static unsigned long long
+process_is_writable_pte(struct trace_seq *s, unsigned long long *args)
+{
+ unsigned long pte = args[0];
+ return pte & PT_WRITABLE_MASK;
+}
+
int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
{
init_disassembler();
@@ -415,5 +425,12 @@ int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
pevent_register_event_handler(pevent, -1, "kvmmmu",
"kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
NULL);
+
+ pevent_register_print_function(pevent,
+ process_is_writable_pte,
+ PEVENT_FUNC_ARG_INT,
+ "is_writable_pte",
+ PEVENT_FUNC_ARG_LONG,
+ PEVENT_FUNC_ARG_VOID);
return 0;
}
--
1.8.3.1
--
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