From patchwork Fri Apr 23 18:17:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jing Zhang X-Patchwork-Id: 12221283 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 CD03CC43470 for ; Fri, 23 Apr 2021 18:17:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2097961467 for ; Fri, 23 Apr 2021 18:17:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243644AbhDWSSM (ORCPT ); Fri, 23 Apr 2021 14:18:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36608 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243653AbhDWSSJ (ORCPT ); Fri, 23 Apr 2021 14:18:09 -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 AB3FEC06138F for ; Fri, 23 Apr 2021 11:17:31 -0700 (PDT) Received: by mail-pf1-x449.google.com with SMTP id a16-20020aa786500000b0290257e9832af4so13486680pfo.5 for ; Fri, 23 Apr 2021 11:17:31 -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=jZ9aELeTtebSkfbpomfAFciujOueU+/1u2IVpj9kO9Q=; b=RyBxs7miM4jdCQ3yugSc8OvrTlv5u+dF3p+Ra7seVMrj1RVtjB+pFXakJoRIl1jsLS 4JBtMKLiNnj9NnUNB9BsPmg2GgDdmytyBuu/qlKens774np+kb3bnNCuXir7AcEhlc1/ MMqfYw4RQYaFjE94XkSwKSrhOxKcqkWzlvWkJUaoPIQajn3YTSQmT7PSjqoq+mzFElwD Nmi2pZp5/s1xwbLuQYIu7SednNnDgqlgHAbjSb3Ng+chogeOuRdzvwODmr0TjSFEqRbh /2xlGDh8qLD5AOsfQQHMcbZvPA7WcxPJHgBTYDJjHZfxvE6utLgsp5D6rJBK8yPps95G xQ1A== 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=jZ9aELeTtebSkfbpomfAFciujOueU+/1u2IVpj9kO9Q=; b=ecmDyuYcr5f8j1Y9DPrhvVdjRwfnEwkwcAAmrCi1UZjlYlV0ZoBbGvEbiaQpKzLnE2 xGF4vTsx0Y7MDBys1VbMBgWvKMU7Z3DEnTk2qdKuucc6iKu5Ug57hCnO8PIHfiwr5bFd Ti0v0KQu7OP6NNpSLM6JrXosJdiV4iCf5zIC+5+P6YZDXT7bSMUnomKjzYx/DHzmR4I6 e+fdISbBwfj4QooLeBTSNqWnn3lBJfbKvxvE3nUjovmEw/wacpkBU09RL+tc6TYu5q5L eq3zzsRHMTluidQayJoXkZB/Y+uAsQzi1kuHL0JCV0rl7gBUzeUyHpUrwG6joZlTe1aR Mjww== X-Gm-Message-State: AOAM531UtdgrNBzHR1xZEAn3tXFuGXh9gFEoibhy3S37/O5LWYSXUE+Y nBCDLc/BUfk8z1y4XQXK76Nsl6fOdJulrouQFqToSiph6i6LPJd1MnK3UdL1LOvwUbJFRLec7bO Seutnr+U5zYaOnn3qqzrBWPPUn+bcezvbFWPJBr1sqkVAHypG7i4ZzXSFXWHsZoHsXc1Id7k= X-Google-Smtp-Source: ABdhPJybLPMWN/SpAe3p+WeheeiGCmvt6zlmflTWrm4w6vD8liP2VaphrDYff46dFN5dJ0IrExvz0uL99CbVXXMV7Q== X-Received: from jgzg.c.googlers.com ([fda3:e722:ac3:10:7f:e700:c0a8:1acf]) (user=jingzhangos job=sendgmr) by 2002:a17:90b:e98:: with SMTP id fv24mr1049588pjb.1.1619201850403; Fri, 23 Apr 2021 11:17:30 -0700 (PDT) Date: Fri, 23 Apr 2021 18:17:23 +0000 Message-Id: <20210423181727.596466-1-jingzhangos@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.31.1.498.g6c1eba8ee3d-goog Subject: [PATCH v3 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. --- * 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 --- 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 | 370 ++++++++++++++++++ tools/testing/selftests/kvm/lib/kvm_util.c | 11 + virt/kvm/kvm_main.c | 237 ++++++++++- 24 files changed, 1405 insertions(+), 90 deletions(-) create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c base-commit: edf408f5257ba39e63781b820528e1ce1ec0f543