From mboxrd@z Thu Jan 1 00:00:00 1970 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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,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 5FEBAC433EF for ; Wed, 22 Sep 2021 00:06:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4BA8260EE0 for ; Wed, 22 Sep 2021 00:06:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231640AbhIVAIA (ORCPT ); Tue, 21 Sep 2021 20:08:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56792 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231616AbhIVAHd (ORCPT ); Tue, 21 Sep 2021 20:07:33 -0400 Received: from mail-qk1-x74a.google.com (mail-qk1-x74a.google.com [IPv6:2607:f8b0:4864:20::74a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E7482C061766 for ; Tue, 21 Sep 2021 17:06:01 -0700 (PDT) Received: by mail-qk1-x74a.google.com with SMTP id m6-20020a05620a24c600b004338e8a5a3cso5730134qkn.10 for ; Tue, 21 Sep 2021 17:06:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=hxRuLxBMmtgulqNWBhVm63T2q6otFpWhzuzOzQjwuz0=; b=AEH25mNfVOzaOi5d6c3BruylgDezaEPCOtesGovpuwBViHkaZN0oJqqsI3ayCNTU47 g0/dG78HVaz39C6dylQWgabX8vR0or8V+qWDB8Hco6j0Zy1BH84lLC4DdigOee9qRXx5 Z0GBtiUbse1uPHuGSgRHXOGN+MswC1H/vEN/9eWkP/kvKiaoxNiLyYnf9+trtkLu2SB3 N3xMQRLYQClaWUgxFLgSR/Ws7M+M5HGzh33BkasWfYaCdmeGEgaOiZCARYtsiDGcOzZZ QmwqXobkE3+q1ncVsZzvdLP7llxDj6xtQ34TQ5DGMtVmRDULQ5ytAScISNgwHfdTAtDC Jt9A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=hxRuLxBMmtgulqNWBhVm63T2q6otFpWhzuzOzQjwuz0=; b=QZtl+ejZf+e3plHEz5dk5KyUVpuWopmHbXSqu44bl2uc5uI52tnzEt5npkuLsgSDTS O3v2AP8CWTM5fytu98TUmiwVLeCxtncz7tT4Uh6CoR9AwjcylcmKBGWyWYEekgGYMZBG e5nm7hEk0mxMUcY8LKgND5P3WliSV7jJjB8qtqSKL/VE1NckEJPuzMCNE96tPaj/PMiP ViYHsgYt6Fx5zsuDM/UGghi3PfQFUdy93nrwKJAQLLRXnk14N0OnJpIdCB02+NIDxXS4 p8vanvM7oYhqNG9503ESyC0ANxWXSldjYKqARGZ43DXzgyPXN9efhRpfaHxVEzl1+aWC XWgA== X-Gm-Message-State: AOAM533tYH0wugLsp5ql73dMMOeO6mKTq8lDvSNjvzUjmjL7lXP49oWH e0i9h3ME1f1d2sZNldNyh43qhpCYDt8= X-Google-Smtp-Source: ABdhPJzZXZc/uBJgDh9/jjk115DCwSnPOWZBsVnqx8QA2MhIXqiGwOq328gHdkdfukulUyubJVoFUxWXEpY= X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:90:200:b022:92d6:d37b:686c]) (user=seanjc job=sendgmr) by 2002:a05:6214:6aa:: with SMTP id s10mr33034215qvz.56.1632269161091; Tue, 21 Sep 2021 17:06:01 -0700 (PDT) Reply-To: Sean Christopherson Date: Tue, 21 Sep 2021 17:05:25 -0700 In-Reply-To: <20210922000533.713300-1-seanjc@google.com> Message-Id: <20210922000533.713300-9-seanjc@google.com> Mime-Version: 1.0 References: <20210922000533.713300-1-seanjc@google.com> X-Mailer: git-send-email 2.33.0.464.g1972c5931b-goog Subject: [PATCH v3 08/16] perf: Force architectures to opt-in to guest callbacks From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Marc Zyngier , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Zhu Lingshan Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce GUEST_PERF_EVENTS and require architectures to select it to allow registering and using guest callbacks in perf. This will hopefully make it more difficult for new architectures to add useless "support" for guest callbacks, e.g. via copy+paste. Stubbing out the helpers has the happy bonus of avoiding a load of perf_guest_cbs when GUEST_PERF_EVENTS=n on arm64/x86. Signed-off-by: Sean Christopherson --- arch/arm64/kvm/Kconfig | 1 + arch/x86/kvm/Kconfig | 1 + arch/x86/xen/Kconfig | 1 + include/linux/perf_event.h | 6 ++++++ init/Kconfig | 4 ++++ kernel/events/core.c | 2 ++ 6 files changed, 15 insertions(+) diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index a4eba0908bfa..f2121404c7c6 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -37,6 +37,7 @@ menuconfig KVM select HAVE_KVM_IRQ_BYPASS select HAVE_KVM_VCPU_RUN_PID_CHANGE select SCHED_INFO + select GUEST_PERF_EVENTS if PERF_EVENTS help Support hosting virtualized guest machines. diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index ac69894eab88..699bf786fbce 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -36,6 +36,7 @@ config KVM select KVM_MMIO select SCHED_INFO select PERF_EVENTS + select GUEST_PERF_EVENTS select HAVE_KVM_MSI select HAVE_KVM_CPU_RELAX_INTERCEPT select HAVE_KVM_NO_POLL diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig index afc1da68b06d..d07595a9552d 100644 --- a/arch/x86/xen/Kconfig +++ b/arch/x86/xen/Kconfig @@ -23,6 +23,7 @@ config XEN_PV select PARAVIRT_XXL select XEN_HAVE_PVMMU select XEN_HAVE_VPMU + select GUEST_PERF_EVENTS help Support running as a Xen PV guest. diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index c0a6eaf55fb1..eefa197d5354 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1238,6 +1238,7 @@ extern void perf_event_bpf_event(struct bpf_prog *prog, enum perf_bpf_event_type type, u16 flags); +#ifdef CONFIG_GUEST_PERF_EVENTS extern struct perf_guest_info_callbacks *perf_guest_cbs; static inline struct perf_guest_info_callbacks *perf_get_guest_cbs(void) { @@ -1273,6 +1274,11 @@ static inline unsigned int perf_guest_handle_intel_pt_intr(void) } extern void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs); extern void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs); +#else +static inline unsigned int perf_guest_state(void) { return 0; } +static inline unsigned long perf_guest_get_ip(void) { return 0; } +static inline unsigned int perf_guest_handle_intel_pt_intr(void) { return 0; } +#endif /* CONFIG_GUEST_PERF_EVENTS */ extern void perf_event_exec(void); extern void perf_event_comm(struct task_struct *tsk, bool exec); diff --git a/init/Kconfig b/init/Kconfig index 55f9f7738ebb..acc7e8ba4563 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1776,6 +1776,10 @@ config HAVE_PERF_EVENTS help See tools/perf/design.txt for details. +config GUEST_PERF_EVENTS + bool + depends on HAVE_PERF_EVENTS + config PERF_USE_VMALLOC bool help diff --git a/kernel/events/core.c b/kernel/events/core.c index 2e3dc9fbd5d9..c6ec05809f54 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6482,6 +6482,7 @@ static void perf_pending_event(struct irq_work *entry) perf_swevent_put_recursion_context(rctx); } +#ifdef CONFIG_GUEST_PERF_EVENTS struct perf_guest_info_callbacks *perf_guest_cbs; void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) @@ -6502,6 +6503,7 @@ void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) synchronize_rcu(); } EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks); +#endif static void perf_output_sample_regs(struct perf_output_handle *handle, -- 2.33.0.464.g1972c5931b-goog