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: 426975 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 93B9EC43460 for ; Fri, 23 Apr 2021 18:17:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6631A61006 for ; Fri, 23 Apr 2021 18:17:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232569AbhDWSSM (ORCPT ); Fri, 23 Apr 2021 14:18:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243649AbhDWSSJ (ORCPT ); Fri, 23 Apr 2021 14:18:09 -0400 Received: from mail-pj1-x104a.google.com (mail-pj1-x104a.google.com [IPv6:2607:f8b0:4864:20::104a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 49E7EC06138C for ; Fri, 23 Apr 2021 11:17:31 -0700 (PDT) Received: by mail-pj1-x104a.google.com with SMTP id h2-20020a17090a6482b029014e6c039e61so20360320pjj.4 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=AM9KJCS6SQIjRGIOAPZXuZjgoI3maMT5Fn8VbSRoQ6oJUnpGn6cQDes2Is65JY85Hw fAsL06uOJjRuZrjTP0Z4YTRd8tj/EJXsoIWOL23dFGRJw6KNgERjaMYt8Mnfy93RgYsV 4awIOauDZtV7HVZuRxHU4ZTKfSKcE0ajEevla7Vtxc8Pb5kCqWni7eN9XYVrOmpWwkUQ LnRwinHPeq8MFyXGgRPO+X1ypKzsCLzT+c1iRcdPnAwGRQD9j0/eASZuGKdkPy9+Ekyl CatfNXj9nlRpChJo9RjXS+8hQ1AcN5jAwLJCikq2p/VhLL5wWDkPMA5Ta1txWdyQTC7w lLzw== X-Gm-Message-State: AOAM530NLFKfZeYLauZAZypLyeWZ++KWQacYFwTSx5J1fIrPj4Dk8tgm EMySxTxAF4jjybMZ84mrrVt3QpvYv2eSy7j+xg== 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: 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. --- * 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