* [PATCH] perf kvm: Fix RISC-V VM-exit duration accounting
@ 2026-11-02 9:18 lirongqing
2026-11-02 9:22 ` sashiko-bot
0 siblings, 1 reply; 2+ messages in thread
From: lirongqing @ 2026-11-02 9:18 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Namhyung Kim, Mark Rutland, Alexander Shishkin, Jiri Olsa,
Ian Rogers, Adrian Hunter, James Clark, Paul Walmsley,
Palmer Dabbelt, Albert Ou, Alexandre Ghiti, Li RongQing,
Atish Patra, Anup Patel, Shenlin Liang, linux-perf-users,
linux-kernel, linux-riscv
From: Li RongQing <lirongqing@baidu.com>
Use kvm_exit as the start event and the following kvm_entry as the
end event for RISC-V VM-exit statistics. Keep decoding scause from
the exit sample.
Before this change, RISC-V measured guest runtime as VM-exit time.
Fixes: da7b1b525e97 ("perf kvm/riscv: Port perf kvm stat to RISC-V")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
---
tools/perf/util/kvm-stat-arch/kvm-stat-riscv.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/tools/perf/util/kvm-stat-arch/kvm-stat-riscv.c b/tools/perf/util/kvm-stat-arch/kvm-stat-riscv.c
index 967bba2..09c9c7d 100644
--- a/tools/perf/util/kvm-stat-arch/kvm-stat-riscv.c
+++ b/tools/perf/util/kvm-stat-arch/kvm-stat-riscv.c
@@ -31,13 +31,7 @@ static void event_get_key(struct perf_sample *sample,
}
static bool event_begin(struct perf_sample *sample,
- struct event_key *key __maybe_unused)
-{
- return evsel__name_is(sample->evsel, kvm_entry_trace(EM_RISCV));
-}
-
-static bool event_end(struct perf_sample *sample,
- struct event_key *key)
+ struct event_key *key)
{
if (evsel__name_is(sample->evsel, kvm_exit_trace(EM_RISCV))) {
event_get_key(sample, key);
@@ -46,6 +40,12 @@ static bool event_end(struct perf_sample *sample,
return false;
}
+static bool event_end(struct perf_sample *sample,
+ struct event_key *key __maybe_unused)
+{
+ return evsel__name_is(sample->evsel, kvm_entry_trace(EM_RISCV));
+}
+
static const struct kvm_events_ops exit_events = {
.is_begin_event = event_begin,
.is_end_event = event_end,
--
2.9.4
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2026-11-02 9:18 [PATCH] perf kvm: Fix RISC-V VM-exit duration accounting lirongqing
2026-11-02 9:22 ` sashiko-bot
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