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perf intel-pt: Split VM-Entry and VM-Exit branches

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Events record a single cpumode so the tools cannot handle a branch from
the host machine to a virtual machine, or vice versa. Split it in two so
that each branch can have a different cpumode.

  E.g.		host ip -> guest ip

  becomes:	host ip -> 0
		      0 -> guest ip

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20210218095801.19576-11-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2021-02-18 11:58:00 +02:00 committed by Arnaldo Carvalho de Melo
parent 695fc45106
commit 19854e45b3
1 changed files with 21 additions and 1 deletions
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22
tools/perf/util/intel-pt.c
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@ -2171,7 +2171,27 @@ static int intel_pt_sample(struct intel_pt_queue *ptq)
}
if (pt->sample_branches) {
err = intel_pt_synth_branch_sample(ptq);
if (state->from_nr != state->to_nr &&
state->from_ip && state->to_ip) {
struct intel_pt_state *st = (struct intel_pt_state *)state;
u64 to_ip = st->to_ip;
u64 from_ip = st->from_ip;
/*
* perf cannot handle having different machines for ip
* and addr, so create 2 branches.
*/
st->to_ip = 0;
err = intel_pt_synth_branch_sample(ptq);
if (err)
return err;
st->from_ip = 0;
st->to_ip = to_ip;
err = intel_pt_synth_branch_sample(ptq);
st->from_ip = from_ip;
} else {
err = intel_pt_synth_branch_sample(ptq);
}
if (err)
return err;
}