From patchwork Fri Apr 2 22:43:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jing Zhang X-Patchwork-Id: 12181711 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 C02E3C433ED for ; Fri, 2 Apr 2021 22:44:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8582961154 for ; Fri, 2 Apr 2021 22:44:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235523AbhDBWoS (ORCPT ); Fri, 2 Apr 2021 18:44:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40420 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234161AbhDBWoQ (ORCPT ); Fri, 2 Apr 2021 18:44:16 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 46034C06178C for ; Fri, 2 Apr 2021 15:44:14 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id i2so10792266ybl.21 for ; Fri, 02 Apr 2021 15:44:14 -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=irIfy9SDJhrUqaDE5ZN6w1PVEQaG5IbsoR3bDTu0jl4=; b=oINmMmgMmoW/oyIcAkt+qHnpbVapAHO0BtBXorG5hnuc57P8B5zKJ7zBvQRstcANLe g5n4RamBX4W+J0lM7mec5Dp6K9/13ohk6ZXhVLCPFigMH64M84+iBExfaQf9hmAzQUiH bZY7VNQunFlIiJhRNQFdKfJbFOB0Z5ctHSCkx6H0TH0GoqpNH18oGgLzf1ZN153zxYSn am8EWHgEB72tVSDwUwtxKSTamIpb7vD/rP8Huv89Yo4aqk6V3/tf8JCDm3oqnXL+hCsQ 02z6sYthCN9r+ritpQhL7w8X3C0Qqdj7AVHhTJsVELFIHoQjykQwl0v9h8r/bTrDVKjH X99w== 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=irIfy9SDJhrUqaDE5ZN6w1PVEQaG5IbsoR3bDTu0jl4=; b=Uyzw7B0ECXY+uScuExE4id7sy1ZT8vdPnvAyx3iFTedeKj8nrzdbKVsF38tTrGIvQ6 zMXk+YM/4YpWuFSCV17sfeluXexJprtCGqfqkK+37IJwKDzSFTSjV40Fslc0df0if8t2 UOEDtTkZE/7SPVejSAnAPb47+Y4D9SBkRKoGr4a2YKOapuVwTbHMnXZugPgzuYN1cqer RXUj6gbDILuTbtprIZA4KwFf4xYpSUWqi37izDIMJlolNZVANdKr8Ri5bL8GQtML7DRo S6sRvaX/FNcTmWTN8OW4MNUXOQPDvtdrKHFItobxvO6F/OBwdqvHzw6iK5Byg6U/BxQ3 JzuA== X-Gm-Message-State: AOAM5328LZ85tofhgw8WwsM2jpQUYPJHcs2p4s4yy46+eZyqPAcGkI00 inbPMoWTWAyt2GK62fGlK7VL1HOOhGPK7xpAog== X-Google-Smtp-Source: ABdhPJyjY/9bgZ4cfSTi5H9NxDPqiTmNCSs6veZkAE2t6SvpxZwTxmf38XzA4gMlvXfjJgmYTh/5eLdnr+RrZ8+4Rw== X-Received: from jingzhangos.c.googlers.com ([fda3:e722:ac3:10:2b:ff92:c0a8:513]) (user=jingzhangos job=sendgmr) by 2002:a25:4dc4:: with SMTP id a187mr21783146ybb.78.1617403453215; Fri, 02 Apr 2021 15:44:13 -0700 (PDT) Date: Fri, 2 Apr 2021 22:43:55 +0000 Message-Id: <20210402224359.2297157-1-jingzhangos@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.31.0.208.g409f899ff0-goog Subject: [PATCH 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. 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