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Message-ID: <5fa1e23d.1f4a.18ff07726a1.Coremail.liangshenlin@eswincomputing.com>
Date: Fri, 7 Jun 2024 10:11:31 +0800 (GMT+08:00)
From: "Shenlin Liang" <liangshenlin@...incomputing.com>
To: "Namhyung Kim" <namhyung@...nel.org>
Cc: anup@...infault.org, atishp@...shpatra.org, paul.walmsley@...ive.com,
palmer@...belt.com, aou@...s.berkeley.edu, kvm@...r.kernel.org,
kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...hat.com,
acme@...nel.org, mark.rutland@....com,
alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
irogers@...gle.com, adrian.hunter@...el.com,
linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v3 2/2] perf kvm/riscv: Port perf kvm stat to RISC-V
On 2024-06-07 08:27, Namhyung Kim <namhyung@...nel.org> wrote:
>
> Hello,
>
> On Mon, Apr 22, 2024 at 08:08:33AM +0000, Shenlin Liang wrote:
> > 'perf kvm stat report/record' generates a statistical analysis of KVM
> > events and can be used to analyze guest exit reasons.
> >
> > "report" reports statistical analysis of guest exit events.
> >
> > To record kvm events on the host:
> > # perf kvm stat record -a
> >
> > To report kvm VM EXIT events:
> > # perf kvm stat report --event=vmexit
> >
> > Signed-off-by: Shenlin Liang <liangshenlin@...incomputing.com>
> > ---
> > tools/perf/arch/riscv/Makefile | 1 +
> > tools/perf/arch/riscv/util/Build | 1 +
> > tools/perf/arch/riscv/util/kvm-stat.c | 79 +++++++++++++++++++
> > .../arch/riscv/util/riscv_exception_types.h | 35 ++++++++
> > 4 files changed, 116 insertions(+)
> > create mode 100644 tools/perf/arch/riscv/util/kvm-stat.c
> > create mode 100644 tools/perf/arch/riscv/util/riscv_exception_types.h
> >
> > diff --git a/tools/perf/arch/riscv/Makefile b/tools/perf/arch/riscv/Makefile
> > index a8d25d005207..e1e445615536 100644
> > --- a/tools/perf/arch/riscv/Makefile
> > +++ b/tools/perf/arch/riscv/Makefile
> > @@ -3,3 +3,4 @@ PERF_HAVE_DWARF_REGS := 1
> > endif
> > PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1
> > PERF_HAVE_JITDUMP := 1
> > +HAVE_KVM_STAT_SUPPORT := 1
> > \ No newline at end of file
> > diff --git a/tools/perf/arch/riscv/util/Build b/tools/perf/arch/riscv/util/Build
> > index 603dbb5ae4dc..d72b04f8d32b 100644
> > --- a/tools/perf/arch/riscv/util/Build
> > +++ b/tools/perf/arch/riscv/util/Build
> > @@ -1,5 +1,6 @@
> > perf-y += perf_regs.o
> > perf-y += header.o
> >
> > +perf-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o
> > perf-$(CONFIG_DWARF) += dwarf-regs.o
> > perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
> > diff --git a/tools/perf/arch/riscv/util/kvm-stat.c b/tools/perf/arch/riscv/util/kvm-stat.c
> > new file mode 100644
> > index 000000000000..58813049fc45
> > --- /dev/null
> > +++ b/tools/perf/arch/riscv/util/kvm-stat.c
> > @@ -0,0 +1,79 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Arch specific functions for perf kvm stat.
> > + *
> > + * Copyright 2024 Beijing ESWIN Computing Technology Co., Ltd.
> > + *
> > + */
> > +#include <errno.h>
> > +#include <memory.h>
> > +#include "../../../util/evsel.h"
> > +#include "../../../util/kvm-stat.h"
> > +#include "riscv_exception_types.h"
> > +#include "debug.h"
> > +
> > +define_exit_reasons_table(riscv_exit_reasons, kvm_riscv_exception_class);
> > +
> > +const char *vcpu_id_str = "id";
> > +const char *kvm_exit_reason = "scause";
> > +const char *kvm_entry_trace = "kvm:kvm_entry";
> > +const char *kvm_exit_trace = "kvm:kvm_exit";
> > +
> > +const char *kvm_events_tp[] = {
> > + "kvm:kvm_entry",
> > + "kvm:kvm_exit",
> > + NULL,
> > +};
> > +
> > +static void event_get_key(struct evsel *evsel,
> > + struct perf_sample *sample,
> > + struct event_key *key)
> > +{
> > + key->info = 0;
> > + key->key = evsel__intval(evsel, sample, kvm_exit_reason);
> > + key->key = (int)key->key;
>
> Looks unnecessary..
>
> Thanks,
> Namhyung
Yes，it's unnecessary...
@Anup, Could you delete this line when merging, or should I send another revision ?
Thanks,
Shenlin
>
>
> > + key->exit_reasons = riscv_exit_reasons;
> > +}
> > +
> > +static bool event_begin(struct evsel *evsel,
> > + struct perf_sample *sample __maybe_unused,
> > + struct event_key *key __maybe_unused)
> > +{
> > + return evsel__name_is(evsel, kvm_entry_trace);
> > +}
> > +
> > +static bool event_end(struct evsel *evsel,
> > + struct perf_sample *sample,
> > + struct event_key *key)
> > +{
> > + if (evsel__name_is(evsel, kvm_exit_trace)) {
> > + event_get_key(evsel, sample, key);
> > + return true;
> > + }
> > + return false;
> > +}
> > +
> > +static struct kvm_events_ops exit_events = {
> > + .is_begin_event = event_begin,
> > + .is_end_event = event_end,
> > + .decode_key = exit_event_decode_key,
> > + .name = "VM-EXIT"
> > +};
> > +
> > +struct kvm_reg_events_ops kvm_reg_events_ops[] = {
> > + {
> > + .name = "vmexit",
> > + .ops = &exit_events,
> > + },
> > + { NULL, NULL },
> > +};
> > +
> > +const char * const kvm_skip_events[] = {
> > + NULL,
> > +};
> > +
> > +int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
> > +{
> > + kvm->exit_reasons_isa = "riscv64";
> > + return 0;
> > +}
> > diff --git a/tools/perf/arch/riscv/util/riscv_exception_types.h b/tools/perf/arch/riscv/util/riscv_exception_types.h
> > new file mode 100644
> > index 000000000000..c49b8fa5e847
> > --- /dev/null
> > +++ b/tools/perf/arch/riscv/util/riscv_exception_types.h
> > @@ -0,0 +1,35 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +#ifndef ARCH_PERF_RISCV_EXCEPTION_TYPES_H
> > +#define ARCH_PERF_RISCV_EXCEPTION_TYPES_H
> > +
> > +#define EXC_INST_MISALIGNED 0
> > +#define EXC_INST_ACCESS 1
> > +#define EXC_INST_ILLEGAL 2
> > +#define EXC_BREAKPOINT 3
> > +#define EXC_LOAD_MISALIGNED 4
> > +#define EXC_LOAD_ACCESS 5
> > +#define EXC_STORE_MISALIGNED 6
> > +#define EXC_STORE_ACCESS 7
> > +#define EXC_SYSCALL 8
> > +#define EXC_HYPERVISOR_SYSCALL 9
> > +#define EXC_SUPERVISOR_SYSCALL 10
> > +#define EXC_INST_PAGE_FAULT 12
> > +#define EXC_LOAD_PAGE_FAULT 13
> > +#define EXC_STORE_PAGE_FAULT 15
> > +#define EXC_INST_GUEST_PAGE_FAULT 20
> > +#define EXC_LOAD_GUEST_PAGE_FAULT 21
> > +#define EXC_VIRTUAL_INST_FAULT 22
> > +#define EXC_STORE_GUEST_PAGE_FAULT 23
> > +
> > +#define EXC(x) {EXC_##x, #x }
> > +
> > +#define kvm_riscv_exception_class \
> > + EXC(INST_MISALIGNED), EXC(INST_ACCESS), EXC(INST_ILLEGAL), \
> > + EXC(BREAKPOINT), EXC(LOAD_MISALIGNED), EXC(LOAD_ACCESS), \
> > + EXC(STORE_MISALIGNED), EXC(STORE_ACCESS), EXC(SYSCALL), \
> > + EXC(HYPERVISOR_SYSCALL), EXC(SUPERVISOR_SYSCALL), \
> > + EXC(INST_PAGE_FAULT), EXC(LOAD_PAGE_FAULT), EXC(STORE_PAGE_FAULT), \
> > + EXC(INST_GUEST_PAGE_FAULT), EXC(LOAD_GUEST_PAGE_FAULT), \
> > + EXC(VIRTUAL_INST_FAULT), EXC(STORE_GUEST_PAGE_FAULT)
> > +
> > +#endif /* ARCH_PERF_RISCV_EXCEPTION_TYPES_H */
> > --
> > 2.37.2
> >
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