Commit da7b1b52 authored by Shenlin Liang's avatar Shenlin Liang Committed by Anup Patel
Browse files

perf kvm/riscv: Port perf kvm stat to RISC-V 



'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: default avatarShenlin Liang <liangshenlin@eswincomputing.com>
Reviewed-by: default avatarAtish Patra <atishp@rivosinc.com>
Tested-by: default avatarAtish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20240422080833.8745-3-liangshenlin@eswincomputing.com


Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent 91195a90

tools/perf/arch/riscv/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

tools/perf/arch/riscv/util/Build

+1 −0
Original line number Diff line number Diff line 
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

tools/perf/arch/riscv/util/kvm-stat.c

0 → 100644
+78 −0
Original line number Diff line number Diff line 
// 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->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;

}

tools/perf/arch/riscv/util/riscv_exception_types.h

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// 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 */