From patchwork Thu Apr 15 15:17:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jing Zhang X-Patchwork-Id: 12205673 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 C1CC6C433ED for ; Thu, 15 Apr 2021 15:20:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 98C8561184 for ; Thu, 15 Apr 2021 15:20:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234204AbhDOPUm (ORCPT ); Thu, 15 Apr 2021 11:20:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49184 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236899AbhDOPUS (ORCPT ); Thu, 15 Apr 2021 11:20:18 -0400 Received: from mail-pf1-x449.google.com (mail-pf1-x449.google.com [IPv6:2607:f8b0:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10FFDC06138F for ; Thu, 15 Apr 2021 08:17:45 -0700 (PDT) Received: by mail-pf1-x449.google.com with SMTP id a16-20020aa786500000b0290257e9832af4so971321pfo.5 for ; Thu, 15 Apr 2021 08:17:45 -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=rURblysS7kpTi9x8OxUlK9nhpB6vhBboGuvysGWXqRw=; b=qwVuZosddg0satSAHkPxr/aaneVDziK0pjqzjvPpzYyd+SSEXK6SULTE35ueUCjHrN l+w0Mh2h7+2aZC6eY1mOzHYVwWU+GhhFcFXsIJ5PxK6hhvMolFtcYb6teQ2ugZDS8yz/ b0FHgvSS2lsZdAxl/Yfq6y6h/Hv9bD2bSAlnqTSzfATkOEqN1nl1h2l9tivwh7r9GE1f 29Eb9eXira/eTJQmcRpROJZbiW9mxjYd8eF38EseaNoj67oiMWhelHbKRrskQ6g2fTWY +HikmUBXZeOGGfx12tmcLCf9lhN7jKRl6o/Ri3ag4QwxHLi/S6HtTbxqoSR0zGxQx9Nq 24ZQ== 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=rURblysS7kpTi9x8OxUlK9nhpB6vhBboGuvysGWXqRw=; b=f1Vdb4FDud4FSj4K1SL6ThM9jmhaYK4NNtWNwqTl3jxLAv6trpjzWp0LkwWzjPdkuM NZ2kN8IQnt7h96pX7OEYdVsvfGFnlfmXv5BpwcdQopZjqv2ej+ymhe7erTD+3hI1kzYh BlacIGWSC7fRYUCXLwJpY3T0lgMD5PELQ6Ixa0vvbGhncnDBC9UzMDi9X0z6fXz1deZD fzXHK+DihFS8LPQ4NA84ufSURsgDiWUXEGQjeKSO2CQuhQet2Wv/x6RsSWPTJlZHsfss mZRE8fob/YkFTaFdt2xOeWPrZO133mtcJlu9fc3NsFQuYdPIRzhEprWrH75ZfqlzY1bF llpA== X-Gm-Message-State: AOAM53059xYKyqNxi0nAYgv7n14qc7vCfVSXMafCI763uqfHVxkJBcvo kMDdQvG5pRzreAXApinFaCBOkcSevH200AAMS+MM0ZpohDCx2HXrQDo51rwgv6H1LfU76BzKd1n WAzEaU+xy4kowXsgUm9vHc5h1vHryCH78ZaxYGgy6mu+rwvNn/nzxedUixsVQVrI8Tc9Ux3g= X-Google-Smtp-Source: ABdhPJyMwjuQSISfNP92ZO3vAT3rkA7W0fq6VXz1CTfac50JyTCuaWbGQONSE2dZOrNe3HMufpnoXv1hFXbgKqbE5w== X-Received: from jgzg.c.googlers.com ([fda3:e722:ac3:10:7f:e700:c0a8:1acf]) (user=jingzhangos job=sendgmr) by 2002:a05:6a00:1c67:b029:215:6f93:d220 with SMTP id s39-20020a056a001c67b02902156f93d220mr3521171pfw.36.1618499864440; Thu, 15 Apr 2021 08:17:44 -0700 (PDT) Date: Thu, 15 Apr 2021 15:17:37 +0000 Message-Id: <20210415151741.1607806-1-jingzhangos@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.31.1.295.g9ea45b61b8-goog Subject: [PATCH v2 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: kvm@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. --- * 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 --- 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 | 169 ++++++++ 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 | 48 +++ 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 | 370 ++++++++++++++++++ tools/testing/selftests/kvm/lib/kvm_util.c | 11 + virt/kvm/kvm_main.c | 237 ++++++++++- 24 files changed, 1401 insertions(+), 90 deletions(-) create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c base-commit: f96be2deac9bca3ef5a2b0b66b71fcef8bad586d