From patchwork Thu Jun 17 04:41:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jing Zhang X-Patchwork-Id: 12326463 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 CAC03C49EA2 for ; Thu, 17 Jun 2021 04:41:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AA769613C1 for ; Thu, 17 Jun 2021 04:41:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230043AbhFQEn7 (ORCPT ); Thu, 17 Jun 2021 00:43:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229693AbhFQEn6 (ORCPT ); Thu, 17 Jun 2021 00:43:58 -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 BB4ACC061574 for ; Wed, 16 Jun 2021 21:41:50 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id m205-20020a25d4d60000b029052a8de1fe41so6676605ybf.23 for ; Wed, 16 Jun 2021 21:41:50 -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=3s1eozoLTG+O62g1UQDRz9lp8lZhA9dilcFNCLVNrmc=; b=db0YxvYVAksAIvRn8DzguGB76wytBIFVDrzngep7lWWXtMo8kZQa5rchHf2uteEu+K HxS1Dw/r8AqDIq6UtA5zCFjMeBoLgyDHUXbdcvAFijzMFX66eyfRqi72Z8wBXua8HAx+ 6NO8WoBZ/BWJoOv+5U3aOXqkawAw2myIX9n4COBU6wnRCFBcavbfvqPW2uqMrbnsNQeb AscXOEU2JShseLT0EAKG5/FLqPqqnwaf2Pi/QlqymJX/z0OrhAfhQbsGHktJVGLCeWAZ 9VG7lh6B3+dyfQiHQQSV+Fp63MWKIunrezw9OfpZdsVZl/EoLoWDtsA2zqj0uaY65esP /QNA== 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=3s1eozoLTG+O62g1UQDRz9lp8lZhA9dilcFNCLVNrmc=; b=XYK/fQ6okHcJ/R7KtKdnyXgS0Tx2Kl+CECCD0inm/Bp5mXycXtUy7fmrXUF9fHw/tT qN85tvCMM3DC8/+66wE97fIL7+XmTkt6qkRqV80xuow05pZuezUDYYP/DkGGMsTl3t3A XF6ibTMsiUPZGgG/FQ/IxCtYoIjVXKO+jy1yDZIEq0inf4UhVW4FIxcM4aVheDu/ihUJ 8duW1fYw6/3ouzrdh5Y3HqYmpTwYxi0SxNhqYO9mLCNTNt0+cn3nEnK5irm5+0ukAdCH a4RK+7SPVlky8qMB3iBY47wh8twnw0iegP3Yod3ww7n9btBcWFTUNMgMyfIUvk+nalo5 bmiQ== X-Gm-Message-State: AOAM530VdHvh4kW+M/AUBFnpWemHk3P8uW5AvKX89pTyhj35qmxRRS4R 4xOQP4TEwMe045ZkhH6MyOiHjFPSGBVqOiVo3Q== X-Google-Smtp-Source: ABdhPJwOgJClowYYNO7/RLiARDkMAJNcFXI3q8kTYlz9mBs1EHYvPdFwazYpeod5q8BGxxGHGgHEjkMc4EAD1OxX+w== X-Received: from jgzg.c.googlers.com ([fda3:e722:ac3:10:7f:e700:c0a8:1acf]) (user=jingzhangos job=sendgmr) by 2002:a25:bb46:: with SMTP id b6mr3371267ybk.346.1623904909931; Wed, 16 Jun 2021 21:41:49 -0700 (PDT) Date: Thu, 17 Jun 2021 04:41:41 +0000 Message-Id: <20210617044146.2667540-1-jingzhangos@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.32.0.272.g935e593368-goog Subject: [PATCH v10 0/5] 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 , David Matlack , Ricardo Koller , Krish Sadhukhan , Fuad Tabba 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 generic * VM statistics data or VCPU statistics data * type: cumulative, instantaneous, peak * 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 data are still being updated by KVM subsystems while they are read out. --- * v9 -> v10 - Relocate vcpu stat in vcpu's slab's usercopy region - Fix test issue for capability checking - Update commit message to explain why/how we need to add this new API for KVM statistics * v8 -> v9 - Rebase to commit 8331a2bc0898 (KVM: X86: Introduce KVM_HC_MAP_GPA_RANGE hypercall) - Reduce code duplication between binary and debugfs interface - Add field "offset" in stats descriptor to let us define stats descriptors in any order (not necessary in the order of stats defined in vm/vcpu stats structures) - Add static check to make sure the number of stats descriptors is the same as the number of stats defined in vm/vcpu stats structures - Fix missing/mismatched stats descriptor definition caused by rebase * v7 -> v8 - Rebase to kvm/queue, commit c1dc20e254b4 ("KVM: switch per-VM stats to u64") - Revise code to reflect the per-VM stats type from ulong to u64 - Addressed some other nits * v6 -> v7 - Improve file descriptor allocation function by Krish suggestion - Use "generic stats" instead of "common stats" as Krish suggested - Addressed some other nits from Krish and David Matlack * v5 -> v6 - Use designated initializers for STATS_DESC - Change KVM_STATS_SCALE... to KVM_STATS_BASE... - Use a common function for kvm_[vm|vcpu]_stats_read - Fix some documentation errors/missings - Use TEST_ASSERT in selftest - Use a common function for [vm|vcpu]_stats_test in selftest * v4 -> v5 - Rebase to kvm/queue, commit a4345a7cecfb ("Merge tag 'kvmarm-fixes-5.13-1'") - Change maximum stats name length to 48 - Replace VM_STATS_COMMON/VCPU_STATS_COMMON macros with stats descriptor definition macros. - Fixed some errors/warnings reported by checkpatch.pl * v3 -> v4 - Rebase to kvm/queue, commit 9f242010c3b4 ("KVM: avoid "deadlock" between install_new_memslots and MMU notifier") - Use C-stype comments in the whole patch - Fix wrong count for x86 VCPU stats descriptors - Fix KVM stats data size counting and validity check in selftest * 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 [3] https://lore.kernel.org/kvm/20210423181727.596466-1-jingzhangos@google.com [4] https://lore.kernel.org/kvm/20210429203740.1935629-1-jingzhangos@google.com [5] https://lore.kernel.org/kvm/20210517145314.157626-1-jingzhangos@google.com [6] https://lore.kernel.org/kvm/20210524151828.4113777-1-jingzhangos@google.com [7] https://lore.kernel.org/kvm/20210603211426.790093-1-jingzhangos@google.com [8] https://lore.kernel.org/kvm/20210611124624.1404010-1-jingzhangos@google.com [9] https://lore.kernel.org/kvm/20210614212155.1670777-1-jingzhangos@google.com --- Jing Zhang (5): KVM: stats: Separate generic stats from architecture specific ones KVM: stats: Add fd-based API to read binary stats data KVM: stats: Add documentation for binary statistics interface KVM: selftests: Add selftest for KVM statistics data binary interface KVM: stats: Remove code duplication for binary and debugfs stats Documentation/virt/kvm/api.rst | 177 +++++++++++- arch/arm64/include/asm/kvm_host.h | 9 +- arch/arm64/kvm/guest.c | 50 +++- arch/mips/include/asm/kvm_host.h | 9 +- arch/mips/kvm/mips.c | 92 +++--- arch/powerpc/include/asm/kvm_host.h | 9 +- arch/powerpc/kvm/book3s.c | 93 ++++-- 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 | 78 +++-- arch/s390/include/asm/kvm_host.h | 9 +- arch/s390/kvm/kvm-s390.c | 234 ++++++++------- arch/x86/include/asm/kvm_host.h | 9 +- arch/x86/kvm/x86.c | 111 ++++--- include/linux/kvm_host.h | 180 +++++++++++- 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_binary_stats_test.c | 225 +++++++++++++++ tools/testing/selftests/kvm/lib/kvm_util.c | 12 + virt/kvm/kvm_main.c | 270 +++++++++++++++--- 24 files changed, 1299 insertions(+), 351 deletions(-) create mode 100644 tools/testing/selftests/kvm/kvm_binary_stats_test.c base-commit: 8331a2bc089881d7fd2fc9a6658f39780817e4e0