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: 12205651 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 E017AC43461 for ; Thu, 15 Apr 2021 15:20:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A08CF61184 for ; Thu, 15 Apr 2021 15:20:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233533AbhDOPUW (ORCPT ); Thu, 15 Apr 2021 11:20:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49294 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236484AbhDOPT6 (ORCPT ); Thu, 15 Apr 2021 11:19:58 -0400 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB5F5C06138D for ; Thu, 15 Apr 2021 08:17:44 -0700 (PDT) Received: by mail-pf1-x44a.google.com with SMTP id x23-20020aa78f170000b0290250e6e3a6f1so2849735pfr.23 for ; Thu, 15 Apr 2021 08:17:44 -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=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=kkfLAIs/Bvueljgs8qhtDIiPlvkvL9MmOS7bG+YypymZ1pTCR3MDORfrlD2Mq49psJ jEEWbGG2NrqYjRP87VjzAPDukjHx/zfUGMb30ICnK6D6N0T6ni2W4UFquP2VPqJga2DA /6e7yYWhzfeN2CjvSc7kbyNzg0Qzp3xA0zy7tnP5MJbsHcinK3UOF/fZDDsYjprq164W akF+XFRMQ2lLw3xRCmdQWHEeTf27YB2K/UNAnLWlYcWZxFk4o0gi7hbMVwpxDVf61+9i Asq9cgeMH6xP6qsr9jcYXuBYQK3HG7oestkvLk4nyUAhs4phNOKXBot/AMpKyEWJGkV4 9Hjw== X-Gm-Message-State: AOAM530Bs0pp5pr0wUg7JSK7b7ndfBbJFrrVY7aH9z72NsiKKsWkzt/e QJ8CAc/1D1xa0E6KtanDhCWYH4w2Gv2mQE8cEw== 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: 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. --- * 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