From patchwork Mon Jun 14 21:21:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jing Zhang X-Patchwork-Id: 12320043 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 CE952C48BE8 for ; Mon, 14 Jun 2021 21:21:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B361F60FF4 for ; Mon, 14 Jun 2021 21:21:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235295AbhFNVYC (ORCPT ); Mon, 14 Jun 2021 17:24:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235281AbhFNVYB (ORCPT ); Mon, 14 Jun 2021 17:24:01 -0400 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C86D8C0617AF for ; Mon, 14 Jun 2021 14:21:58 -0700 (PDT) Received: by mail-pg1-x549.google.com with SMTP id q12-20020a65684c0000b029022094918bbfso7474874pgt.2 for ; Mon, 14 Jun 2021 14:21:58 -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=SlycgcgP2oQfG/m1tsRJUCUu6HgyYclxJAGE9lbfI7I=; b=J5OsUMD3R5is1cvWM/Tf1GSvgvYrw1ZTFA6WV9mLsYov03y0xK/HdMK6yCJsYckKRo TtGE8n4Fxq4EYtG5ozUsMbV4AkLNWy6LWw1l/UrYBiYJu0fC4BCnkbAiprvyp67AI3ez ++RPtlvVdFNIPeK0a8u7bdfuzu81cD4Qr5bFuVp+KHu3u+cD9+BzjSE+HCFtNuDlrUSs 4IlHyplTtL9gmtWN9jVHfwL72LuuWxHzrtkVsRISlOX67uSROjJCiF8xz508A4WqzgR2 QZih02YKtsk/ChyGZd7Eon8GpWthGvOj55UNC2eUCNQplIFeeOGWlfJrOndDtyOb0zWF m4QQ== 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=SlycgcgP2oQfG/m1tsRJUCUu6HgyYclxJAGE9lbfI7I=; b=oYcBS0pllZ9tHu1MErks9L+lcimeNDe1MBjNP+y6iXo6pvhBFs9CKbIJWl4qvYSR+d YdaZGXUqghCLGn9EXzoeGFdJPRhghLueXL+8IEQqvi3JpQdJshlRxjRCRjQ0yoSBvTmv tbd+sWIUtsWaU6WHwSg8Ow96U4vxe4B2SxW7dUG0boK2gAOBBoDgW7VgpoMFKmDn4ZTR xzTG2QvHkLXjQJ0NxG0uJ50athhVgudzPXTTR656cZJy+7dAItzZy7abY7SETkymT8Jo UM4SpibcT+IKZI7ekMZhcZVG5s8szVx56/syi4Mbah2KMbYZ46pxsiybC1CE1xgvXFwa CWgw== X-Gm-Message-State: AOAM530dtdbUouVnc8BTpO02gKlWRGSlCA5a3tbhMj/ecbH9Ca2EWeKB Z3vLxwl1jI2mAVskf7Ae82hvahAZF5eG4TYTqKsLCAvhh4KDBb+uPnKSonk3B517KfPL1uhoEUc IBJ1Y9pb2sB2GcGGrC826bRpnpX1k3WhPtWdqMxfs7zPwtCVgzEeaUqp+9UaFssuCQIqvnDY= X-Google-Smtp-Source: ABdhPJz2FI55sVryTZAxtgeRMOOpHWs/+X17g6DjdqznoExrtjOxluBZp09o2sArM1nsheTY/TttMFSWE8kjHPwfdA== X-Received: from jgzg.c.googlers.com ([fda3:e722:ac3:10:7f:e700:c0a8:1acf]) (user=jingzhangos job=sendgmr) by 2002:a17:902:7d8c:b029:105:2b81:3915 with SMTP id a12-20020a1709027d8cb02901052b813915mr985196plm.71.1623705717928; Mon, 14 Jun 2021 14:21:57 -0700 (PDT) Date: Mon, 14 Jun 2021 21:21:50 +0000 Message-Id: <20210614212155.1670777-1-jingzhangos@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.32.0.272.g935e593368-goog Subject: [PATCH v9 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: kvm@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 date are still being updated by KVM subsystems while they are read out. --- * 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 --- 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 statistics data binary 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 | 178 +++++++++++- 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 | 261 +++++++++++++++--- 24 files changed, 1293 insertions(+), 346 deletions(-) create mode 100644 tools/testing/selftests/kvm/kvm_binary_stats_test.c base-commit: 8331a2bc089881d7fd2fc9a6658f39780817e4e0