From patchwork Wed Jun 12 09:08:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zenghui Yu X-Patchwork-Id: 10989115 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 545F214E5 for ; Wed, 12 Jun 2019 09:15:26 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3E88728650 for ; Wed, 12 Jun 2019 09:15:26 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2E1A628928; Wed, 12 Jun 2019 09:15:26 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6C79D28650 for ; Wed, 12 Jun 2019 09:15:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2408701AbfFLJO7 (ORCPT ); Wed, 12 Jun 2019 05:14:59 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:18555 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2405360AbfFLJO7 (ORCPT ); Wed, 12 Jun 2019 05:14:59 -0400 Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 12076407B096C334960D; Wed, 12 Jun 2019 17:11:56 +0800 (CST) Received: from HGHY2Y004646261.china.huawei.com (10.184.12.158) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.439.0; Wed, 12 Jun 2019 17:11:47 +0800 From: Zenghui Yu To: , , , , CC: , , , , , , , , , , , , , , , , Zenghui Yu Subject: [PATCH v1 4/5] perf,kvm/arm64: Add stat support on arm64 Date: Wed, 12 Jun 2019 09:08:45 +0000 Message-ID: <1560330526-15468-5-git-send-email-yuzenghui@huawei.com> X-Mailer: git-send-email 2.6.4.windows.1 In-Reply-To: <1560330526-15468-1-git-send-email-yuzenghui@huawei.com> References: <1560330526-15468-1-git-send-email-yuzenghui@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.184.12.158] X-CFilter-Loop: Reflected Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 'perf kvm stat report/record' generates a statistical analysis of KVM events and can be used to analyze guest exit reasons. This patch tries to add stat support on arm64. We have a mapping between guest's "exit_code" and "exit_reason" which already exists under arch/arm64/include/asm/ (kvm_arm_exception_type), and we've used it to report guest's exit type through trace_kvm_exit(). Copy kvm_arm_exception_type into aarch64_guest_exits.h, thus export it to userspace. It records on two available KVM tracepoints for arm64: "kvm:kvm_entry" and "kvm:kvm_exit", and reports statistical data which includes events handles time, samples, and so on. A simple test go below: # pgrep qemu 6039 9937 # ./tools/perf/perf kvm stat record -p 6039 [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 15.629 MB perf.data.guest (199063 samples) ] # ./tools/perf/perf kvm stat report --event=vmexit Analyze events for all VMs, all VCPUs: VM-EXIT Samples Samples% Time% Min Time Max Time Avg time TRAP 49040 97.15% 100.00% 2.60us 4072.98us 3431.60us ( +- 0.17% ) IRQ 1437 2.85% 0.00% 0.90us 24.56us 2.06us ( +- 1.37% ) Total Samples:50477, Total events handled time:168288630.04us. Cc: Arnaldo Carvalho de Melo Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Christoffer Dall Cc: Marc Zyngier Signed-off-by: Zenghui Yu --- tools/perf/arch/arm64/Makefile | 2 + tools/perf/arch/arm64/util/Build | 1 + tools/perf/arch/arm64/util/aarch64_guest_exits.h | 23 +++++++++ tools/perf/arch/arm64/util/kvm-stat.c | 60 ++++++++++++++++++++++++ 4 files changed, 86 insertions(+) create mode 100644 tools/perf/arch/arm64/util/aarch64_guest_exits.h create mode 100644 tools/perf/arch/arm64/util/kvm-stat.c diff --git a/tools/perf/arch/arm64/Makefile b/tools/perf/arch/arm64/Makefile index dbef716..172146e 100644 --- a/tools/perf/arch/arm64/Makefile +++ b/tools/perf/arch/arm64/Makefile @@ -2,6 +2,8 @@ ifndef NO_DWARF PERF_HAVE_DWARF_REGS := 1 endif + +HAVE_KVM_STAT_SUPPORT := 1 PERF_HAVE_JITDUMP := 1 PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1 diff --git a/tools/perf/arch/arm64/util/Build b/tools/perf/arch/arm64/util/Build index 3cde540..d136674 100644 --- a/tools/perf/arch/arm64/util/Build +++ b/tools/perf/arch/arm64/util/Build @@ -1,5 +1,6 @@ perf-y += header.o perf-y += sym-handling.o +perf-y += kvm-stat.o perf-$(CONFIG_DWARF) += dwarf-regs.o perf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o diff --git a/tools/perf/arch/arm64/util/aarch64_guest_exits.h b/tools/perf/arch/arm64/util/aarch64_guest_exits.h new file mode 100644 index 0000000..a8ca4b8 --- /dev/null +++ b/tools/perf/arch/arm64/util/aarch64_guest_exits.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef ARCH_PERF_AARCH64_GUEST_EXITS_H +#define ARCH_PERF_AARCH64_GUEST_EXITS_H + +/* virt.h */ +/* Error returned when an invalid stub number is passed into x0 */ +#define HVC_STUB_ERR 0xbadca11 + +/* kvm_asm.h */ +#define ARM_EXCEPTION_IRQ 0 +#define ARM_EXCEPTION_EL1_SERROR 1 +#define ARM_EXCEPTION_TRAP 2 +#define ARM_EXCEPTION_IL 3 +/* The hyp-stub will return this for any kvm_call_hyp() call */ +#define ARM_EXCEPTION_HYP_GONE HVC_STUB_ERR + +#define kvm_arm_exception_type \ + {ARM_EXCEPTION_IRQ, "IRQ" }, \ + {ARM_EXCEPTION_EL1_SERROR, "SERROR" }, \ + {ARM_EXCEPTION_TRAP, "TRAP" }, \ + {ARM_EXCEPTION_HYP_GONE, "HYP_GONE" } + +#endif diff --git a/tools/perf/arch/arm64/util/kvm-stat.c b/tools/perf/arch/arm64/util/kvm-stat.c new file mode 100644 index 0000000..5804bc2 --- /dev/null +++ b/tools/perf/arch/arm64/util/kvm-stat.c @@ -0,0 +1,60 @@ +/* + * Arch specific functions for perf kvm stat. + * + * Copyright (c) 2019 - Huawei Technologies Co., Ltd. + * Author(s): Zenghui Yu + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ +#include +#include "../../util/kvm-stat.h" +#include "../../util/evsel.h" +#include "aarch64_guest_exits.h" + +define_exit_reasons_table(arm64_exit_reasons, kvm_arm_exception_type); + +static struct kvm_events_ops exit_events = { + .is_begin_event = exit_event_begin, + .is_end_event = exit_event_end, + .decode_key = exit_event_decode_key, + .name = "VM-EXIT" +}; + +const char *vcpu_id_str = "vcpu_id"; +const int decode_str_len = 20; +const char *kvm_exit_reason = "ret"; +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, +}; + +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 = arm64_exit_reasons; + kvm->exit_reasons_isa = "aarch64"; + + return 0; +}