linux-kernel - Re: [PATCH 33/35] perf intel-pt: Add machine_pid and vcpu to auxtrace

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Date:   Tue, 19 Jul 2022 22:27:19 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 33/35] perf intel-pt: Add machine_pid and vcpu to auxtrace_error

On Mon, Jul 11, 2022 at 2:34 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> When decoding with guest sideband information, for VMX non-root (NR)
> i.e. guest errors, replace the host (hypervisor) pid/tid with guest values,
> and provide also the new machine_pid and vcpu values.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>

Acked-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/perf/util/intel-pt.c | 26 ++++++++++++++++++++------
>  1 file changed, 20 insertions(+), 6 deletions(-)
>
> diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
> index a08c2f059d5a..143a096b567b 100644
> --- a/tools/perf/util/intel-pt.c
> +++ b/tools/perf/util/intel-pt.c
> @@ -2404,7 +2404,8 @@ static int intel_pt_synth_iflag_chg_sample(struct intel_pt_queue *ptq)
>  }
>
>  static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
> -                               pid_t pid, pid_t tid, u64 ip, u64 timestamp)
> +                               pid_t pid, pid_t tid, u64 ip, u64 timestamp,
> +                               pid_t machine_pid, int vcpu)
>  {
>         union perf_event event;
>         char msg[MAX_AUXTRACE_ERROR_MSG];
> @@ -2421,8 +2422,9 @@ static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
>
>         intel_pt__strerror(code, msg, MAX_AUXTRACE_ERROR_MSG);
>
> -       auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
> -                            code, cpu, pid, tid, ip, msg, timestamp);
> +       auxtrace_synth_guest_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
> +                                  code, cpu, pid, tid, ip, msg, timestamp,
> +                                  machine_pid, vcpu);
>
>         err = perf_session__deliver_synth_event(pt->session, &event, NULL);
>         if (err)
> @@ -2437,11 +2439,22 @@ static int intel_ptq_synth_error(struct intel_pt_queue *ptq,
>  {
>         struct intel_pt *pt = ptq->pt;
>         u64 tm = ptq->timestamp;
> +       pid_t machine_pid = 0;
> +       pid_t pid = ptq->pid;
> +       pid_t tid = ptq->tid;
> +       int vcpu = -1;
>
>         tm = pt->timeless_decoding ? 0 : tsc_to_perf_time(tm, &pt->tc);
>
> -       return intel_pt_synth_error(pt, state->err, ptq->cpu, ptq->pid,
> -                                   ptq->tid, state->from_ip, tm);
> +       if (pt->have_guest_sideband && state->from_nr) {
> +               machine_pid = ptq->guest_machine_pid;
> +               vcpu = ptq->vcpu;
> +               pid = ptq->guest_pid;
> +               tid = ptq->guest_tid;
> +       }
> +
> +       return intel_pt_synth_error(pt, state->err, ptq->cpu, pid, tid,
> +                                   state->from_ip, tm, machine_pid, vcpu);
>  }
>
>  static int intel_pt_next_tid(struct intel_pt *pt, struct intel_pt_queue *ptq)
> @@ -3028,7 +3041,8 @@ static int intel_pt_process_timeless_sample(struct intel_pt *pt,
>  static int intel_pt_lost(struct intel_pt *pt, struct perf_sample *sample)
>  {
>         return intel_pt_synth_error(pt, INTEL_PT_ERR_LOST, sample->cpu,
> -                                   sample->pid, sample->tid, 0, sample->time);
> +                                   sample->pid, sample->tid, 0, sample->time,
> +                                   sample->machine_pid, sample->vcpu);
>  }
>
>  static struct intel_pt_queue *intel_pt_cpu_to_ptq(struct intel_pt *pt, int cpu)
> --
> 2.25.1
>