linux-kernel - Re: [PATCH 1/3] perf intel-pt: Fix parsing of VM time correlation arguments

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Date:   Wed, 15 Dec 2021 10:04:47 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Riccardo Mancini <rickyman7@...il.com>
Subject: Re: [PATCH 1/3] perf intel-pt: Fix parsing of VM time correlation arguments

Hi Adrian,

On Wed, Dec 15, 2021 at 12:07 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> Parser did not take ':' into account.
>
> Example:
>
>  Before:
>
>   $ perf record -e intel_pt//u uname
>   Linux
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.026 MB perf.data ]
>   $ perf inject -i perf.data --vm-time-correlation="dry-run 123"
>   $ perf inject -i perf.data --vm-time-correlation="dry-run 123:456"
>   Failed to parse VM Time Correlation options
>   0x620 [0x98]: failed to process type: 70 [Invalid argument]
>   $
>
>  After:
>
>   $ perf inject -i perf.data --vm-time-correlation="dry-run 123:456"
>   $
>
> Fixes: e3ff42bdebcfe ("perf intel-pt: Parse VM Time Correlation options and set up decoding")
> Cc: stable@...r.kernel.org
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung

> ---
>  tools/perf/util/intel-pt.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
> index 10c3187e4c5a..e8613cbda331 100644
> --- a/tools/perf/util/intel-pt.c
> +++ b/tools/perf/util/intel-pt.c
> @@ -3625,6 +3625,7 @@ static int intel_pt_parse_vm_tm_corr_arg(struct intel_pt *pt, char **args)
>                 *args = p;
>                 return 0;
>         }
> +       p += 1;
>         while (1) {
>                 vmcs = strtoull(p, &p, 0);
>                 if (errno)
> --
> 2.25.1
>