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perf/x86/intel: Correct pt_regs->flags update for PEBS path

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pt_regs->flags holds the saved CPU FLAGS register. In the PEBS path,
it was incorrectly set to PERF_EFLAGS_EXACT instead of being populated
from the PEBS flags snapshot.

Update pt_regs->flags from PEBS GPR flags if GPRs group is present.

Fixes: c22497f583 ("perf/x86/intel: Support adaptive PEBS v4")
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260908075102.540715-1-dapeng1.mi@linux.intel.com
This commit is contained in:
Dapeng Mi 2026-09-08 15:51:01 +08:00 committed by Peter Zijlstra
parent 59e63416f5
commit 88aa1223bf
1 changed files with 9 additions and 1 deletions
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10
arch/x86/events/intel/ds.c
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@ -2432,7 +2432,7 @@ static inline void __setup_pebs_basic_group(struct perf_event *event,
{
/* The ip in basic is EventingIP */
set_linear_ip(regs, ip);
regs->flags = PERF_EFLAGS_EXACT;
regs->flags |= PERF_EFLAGS_EXACT;
setup_pebs_time(event, data, tsc);
if (sample_type & PERF_SAMPLE_WEIGHT_STRUCT)
@ -2444,9 +2444,17 @@ static inline void __setup_pebs_gpr_group(struct perf_event *event,
struct pebs_gprs *gprs,
u64 sample_type)
{
/*
* Update flags with PEBS data. PERF_EFLAGS_EXACT must be set
* in previous basic group handling.
*/
regs->flags = gprs->flags | PERF_EFLAGS_EXACT;
if (event->attr.precise_ip < 2) {
set_linear_ip(regs, gprs->ip);
regs->flags &= ~PERF_EFLAGS_EXACT;
} else if (regs->flags & X86_VM_MASK) {
regs->flags ^= (PERF_EFLAGS_VM | X86_VM_MASK);
}
if (sample_type & (PERF_SAMPLE_REGS_INTR | PERF_SAMPLE_REGS_USER))