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2c47e7a74f
Previously any PMU overflow interrupt that fired while a VCPU was loaded was recorded as a guest event whether it truly was or not. This resulted in nonsense perf recordings that did not honor perf_event_attr.exclude_guest and recorded guest IPs where it should have recorded host IPs. Rework the sampling logic to only record guest samples for events with exclude_guest = 0. This way any host-only events with exclude_guest set will never see unexpected guest samples. The behaviour of events with exclude_guest = 0 is unchanged. Note that events configured to sample both host and guest may still misattribute a PMI that arrived in the host as a guest event depending on KVM arch and vendor behavior. Signed-off-by: Colton Lewis <coltonlewis@google.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Oliver Upton <oliver.upton@linux.dev> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Kan Liang <kan.liang@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20241113190156.2145593-6-coltonlewis@google.com
23 lines
515 B
C
23 lines
515 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_PERF_EVENT_H
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#define __ASM_PERF_EVENT_H
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#include <asm/stack_pointer.h>
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#include <asm/ptrace.h>
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#ifdef CONFIG_PERF_EVENTS
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#define perf_arch_bpf_user_pt_regs(regs) ®s->user_regs
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#endif
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#define perf_arch_fetch_caller_regs(regs, __ip) { \
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(regs)->pc = (__ip); \
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(regs)->regs[29] = (unsigned long) __builtin_frame_address(0); \
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(regs)->sp = current_stack_pointer; \
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(regs)->pstate = PSR_MODE_EL1h; \
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}
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#endif
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