From patchwork Thu Apr 29 20:37:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jing Zhang X-Patchwork-Id: 12231877 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-21.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF4BFC433B4 for ; Thu, 29 Apr 2021 20:37:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BF0306143A for ; Thu, 29 Apr 2021 20:37:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233659AbhD2Uib (ORCPT ); Thu, 29 Apr 2021 16:38:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37164 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233176AbhD2Uib (ORCPT ); Thu, 29 Apr 2021 16:38:31 -0400 Received: from mail-pg1-x54a.google.com (mail-pg1-x54a.google.com [IPv6:2607:f8b0:4864:20::54a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65524C06138E for ; Thu, 29 Apr 2021 13:37:44 -0700 (PDT) Received: by mail-pg1-x54a.google.com with SMTP id a15-20020a634d0f0000b0290209ec44cf15so15328967pgb.0 for ; Thu, 29 Apr 2021 13:37:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=AGPbcGDitssQwR2vRkOkuDZa9dX2kbuG1ibqn3VGykk=; b=vKUaHf8Js7ssAthsBYE69zLm1fhKC668a4XSogrAS2/Dj/o0DGFMmmsqCnsDdBK3r8 fU72HhuLV+N91HbI4pSgh5Tv0i1PzUEBWXj5fFX67L+XU+lVL8pWWznsP0NVQAQ5lUN8 tnGqagWLjEKhm+kdYP0z5D1VFGd6D7c5iZaQMTCVsEY02BoS0mnuzX3PxsSzTzAH96TW tg88Vd5GmUxj49R4qFOrP19khvrv7Uk7Z12xOA/41VGF6xIzWWzGX5Ujhfw/yE2w/sDo 5qe4eKKz4NBm3zmwuvIwm9mkX7c0VkNxwjlxlY2NlKl+E9wZZUof0MbYVFwoGUhzfAhm LpEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=AGPbcGDitssQwR2vRkOkuDZa9dX2kbuG1ibqn3VGykk=; b=gA9E2IFnEg9lDs3hm+RDa9rv9yCnf9HXBca+bAq92LEL1ae3dPl/dNQQ0s7BTPNdQ0 Sqw7jvI6zOL7/l4uStZv3i5q2lZ24PRGXjKwd0oIwhZQROLdP+eZYhlPWzTTiZxo7jkk 66OgQLCFqxePKr2gvBETzZkvlerUWOWgSSRxw0+qwhwElJYGwnApBUcvNiuUAn0NBzjU D2MGzYXpVm0nj/Sc7KVvrGDo98QfZypNYk8gPeGxHAIQ7ztuebubjCMyE+oOJ1stepH5 WT17OuioeWOdDr1GuH/tidkuFywQYI8foUC6nHTKk7kSZboVB5x1UW3xea/Rab60AEKZ 3cQA== X-Gm-Message-State: AOAM531GnaY89KqOZKWxAHWCp6HtbO2e8lUEyCodTk+t5lVgbeOoYYi+ bFCFYDiugf7y5aiop6TopvbjZaupgXt/duIR3A== X-Google-Smtp-Source: ABdhPJxa1nzLFdFJjcOVu7fh1Y6W8Fs7WxRv4NSYd6yoIxBYT8+4qmIZrtv36CAWNU9/OaCLxfjmfxSFKptxvj1z1A== X-Received: from jgzg.c.googlers.com ([fda3:e722:ac3:10:7f:e700:c0a8:1acf]) (user=jingzhangos job=sendgmr) by 2002:aa7:8e0d:0:b029:214:a511:d88b with SMTP id c13-20020aa78e0d0000b0290214a511d88bmr1651129pfr.2.1619728663762; Thu, 29 Apr 2021 13:37:43 -0700 (PDT) Date: Thu, 29 Apr 2021 20:37:36 +0000 Message-Id: <20210429203740.1935629-1-jingzhangos@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.31.1.527.g47e6f16901-goog Subject: [PATCH v4 0/4] KVM statistics data fd-based binary interface From: Jing Zhang To: KVM , KVMARM , LinuxMIPS , KVMPPC , LinuxS390 , Linuxkselftest , Paolo Bonzini , Marc Zyngier , James Morse , Julien Thierry , Suzuki K Poulose , Will Deacon , Huacai Chen , Aleksandar Markovic , Thomas Bogendoerfer , Paul Mackerras , Christian Borntraeger , Janosch Frank , David Hildenbrand , Cornelia Huck , Claudio Imbrenda , Sean Christopherson , Vitaly Kuznetsov , Jim Mattson , Peter Shier , Oliver Upton , David Rientjes , Emanuele Giuseppe Esposito Cc: Jing Zhang Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org This patchset provides a file descriptor for every VM and VCPU to read KVM statistics data in binary format. It is meant to provide a lightweight, flexible, scalable and efficient lock-free solution for user space telemetry applications to pull the statistics data periodically for large scale systems. The pulling frequency could be as high as a few times per second. In this patchset, every statistics data are treated to have some attributes as below: * architecture dependent or common * VM statistics data or VCPU statistics data * type: cumulative, instantaneous, * unit: none for simple counter, nanosecond, microsecond, millisecond, second, Byte, KiByte, MiByte, GiByte. Clock Cycles Since no lock/synchronization is used, the consistency between all the statistics data is not guaranteed. That means not all statistics data are read out at the exact same time, since the statistics date are still being updated by KVM subsystems while they are read out. --- * v3 -> v4 - Rebase to kvm/queue, commit 9f242010c3b4 ("KVM: avoid "deadlock" between install_new_memslots and MMU notifier") - Use C-stype comments in the whole patch - Fix wrong count for x86 VCPU stats descriptors - Fix KVM stats data size counting and validity check in selftest * v2 -> v3 - Rebase to kvm/queue, commit edf408f5257b ("KVM: avoid "deadlock" between install_new_memslots and MMU notifier") - Resolve some nitpicks about format * v1 -> v2 - Use ARRAY_SIZE to count the number of stats descriptors - Fix missing `size` field initialization in macro STATS_DESC [1] https://lore.kernel.org/kvm/20210402224359.2297157-1-jingzhangos@google.com [2] https://lore.kernel.org/kvm/20210415151741.1607806-1-jingzhangos@google.com [3] https://lore.kernel.org/kvm/20210423181727.596466-1-jingzhangos@google.com --- Jing Zhang (4): KVM: stats: Separate common stats from architecture specific ones KVM: stats: Add fd-based API to read binary stats data KVM: stats: Add documentation for statistics data binary interface KVM: selftests: Add selftest for KVM statistics data binary interface Documentation/virt/kvm/api.rst | 171 ++++++++ arch/arm64/include/asm/kvm_host.h | 9 +- arch/arm64/kvm/guest.c | 42 +- arch/mips/include/asm/kvm_host.h | 9 +- arch/mips/kvm/mips.c | 67 ++- arch/powerpc/include/asm/kvm_host.h | 9 +- arch/powerpc/kvm/book3s.c | 68 +++- arch/powerpc/kvm/book3s_hv.c | 12 +- arch/powerpc/kvm/book3s_pr.c | 2 +- arch/powerpc/kvm/book3s_pr_papr.c | 2 +- arch/powerpc/kvm/booke.c | 63 ++- arch/s390/include/asm/kvm_host.h | 9 +- arch/s390/kvm/kvm-s390.c | 133 +++++- arch/x86/include/asm/kvm_host.h | 9 +- arch/x86/kvm/x86.c | 71 +++- include/linux/kvm_host.h | 132 +++++- include/linux/kvm_types.h | 12 + include/uapi/linux/kvm.h | 50 +++ tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 3 + .../testing/selftests/kvm/include/kvm_util.h | 3 + .../selftests/kvm/kvm_bin_form_stats.c | 380 ++++++++++++++++++ tools/testing/selftests/kvm/lib/kvm_util.c | 11 + virt/kvm/kvm_main.c | 237 ++++++++++- 24 files changed, 1415 insertions(+), 90 deletions(-) create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c base-commit: 9f242010c3b46e63bc62f08fff42cef992d3801b