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: 1461924 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20161025 header.b=oINmMmgM; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4FBw8f6xWNz9sWD for ; Sat, 3 Apr 2021 09:44:18 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235598AbhDBWoS (ORCPT ); Fri, 2 Apr 2021 18:44:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234207AbhDBWoQ (ORCPT ); Fri, 2 Apr 2021 18:44:16 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4CA31C061793 for ; Fri, 2 Apr 2021 15:44:14 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id s100so574416ybi.19 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=S2UTsBB2Qy5G+XZ2XXQIhe11QqqeA8UWdpHeNTbnttV3Mdcqar22J1n4wykk5xfT1g 00X88vupldVz4lNzM71bEGnSsg+GUTSlUsCPYFyuQxVLJQXu3ui0Xdo5aXpyc/J2ozr+ ZYbiV+OmxpCn/teasSVNr4j9ssxlztJVJ+0BP2TJebci/Oc6r8uRXg6esLYVl5iQBwZe TD3YpKRMw1QkO6NVhn+hc5i5krTXQUzcbMaiAx+suRZ8hgUDJnbqvupAq2JOBJ32F4BP rBugmK6Y5kpnawMQPkNP3uCxqXZi0Xy+J2lXULCqPqGf8zIF432e6xbbOtYlK6fZwosd 1JxA== X-Gm-Message-State: AOAM532PihlWTQeVc8ye/shABMUWuWetE6A8B1c8DWna7kb/vcANkxQk rmyGfURhIgPGcC6eYvWBuwLy+IjAvqVN2ddPbg== 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: kvm-ppc@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