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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 614A6C433F5 for ; Thu, 11 Nov 2021 02:08:02 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id F020161073 for ; Thu, 11 Nov 2021 02:08:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org F020161073 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id A51574B239; Wed, 10 Nov 2021 21:08:01 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id b66CkhU4pYIG; Wed, 10 Nov 2021 21:08:00 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 02E034B259; Wed, 10 Nov 2021 21:07:58 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id C52314B1E4 for ; Wed, 10 Nov 2021 21:07:56 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id b7wVGUc96kKn for ; Wed, 10 Nov 2021 21:07:55 -0500 (EST) Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 17B224B220 for ; Wed, 10 Nov 2021 21:07:55 -0500 (EST) Received: by mail-pf1-f201.google.com with SMTP id z187-20020a6233c4000000b0047c2090f1abso2998591pfz.23 for ; Wed, 10 Nov 2021 18:07:55 -0800 (PST) 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=Qts44yZaW6qsc605OlT7Zz8eai+zBrqGoLbFoG4wiuw=; b=Zfi8DY3ovwoiH8lfWrxLb/W+rRSaGWbn2rFa446dfUQXHgUbfdUKYMOyW1lpuH1MR+ xW8LXXYpKTlc7ug96G/Ee8ToPnPuFjZ6+ZvcCvMBWtEmqhdQ3/vNbJyBdjGJwYQJnBZp eg5ocwliNalXx19wDw7gg6hx7kfIvpSxscV8PzvnOb5EfIXw0M0nS4wd8cy4vSyQ7D8r 47B+6iKMQq7yLKce9j9o6wFmrE8KChMVlSCYvT0NoUscJKcLP0B0byJ9BhCQP5AmwJDt Xn99jo+MhAsbr7g8NKvRMpjQUhyAw5fqNt4uJCKa9oaEyT74/pPuTXuqJFQjVL14748I xNkw== 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=Qts44yZaW6qsc605OlT7Zz8eai+zBrqGoLbFoG4wiuw=; b=6IN+vlGHlivvryKP8G9750BVPDgFEu6exTeeUaSRM37iWUMY0Aj6qV17XWezyfICw4 jHHrMyaZtHGgrZAdvWuGx8CrIRVMIEtyH1EvBaFGdp7Txy8e8qEs2VTTu9nBf3wgcDf6 cJlVGSrgX7Gc3EI6rDylWCYr2+M4YfGYVzdFrcXp67fQMrgKP9wO34rBuWH0KTaVDyVy suAnVexkwu6GN5aqaGQ5h13zbG/Aozx9fLAlzlPhIfG+ap3MiexGaiSGfsSS5OpNNrex z4nY/NU8J+ilE2IOHyyobDZwdE1hEKnZvJIeie/6Rhb/OZ2imR1DdvTxDVlDX3NkpgUI LKPg== X-Gm-Message-State: AOAM530sw/st3fqz37MB4ToKu4UtudFHSN40V2Qqx1rS6S5BloVfuCzt XJGZ8ssmCKtEw+l+hIl9OELsqkOcLPo= X-Google-Smtp-Source: ABdhPJzzaoFWeNToP2f/V/MLS8kOItNfusQJva0ujL0AlnvrfyJ7uCasThKDANgj3halkP9yaN2IQPCiXvk= X-Received: from seanjc.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3e5]) (user=seanjc job=sendgmr) by 2002:a17:902:8544:b0:142:66e7:afbb with SMTP id d4-20020a170902854400b0014266e7afbbmr3818315plo.62.1636596474245; Wed, 10 Nov 2021 18:07:54 -0800 (PST) Date: Thu, 11 Nov 2021 02:07:29 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-9-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 08/17] 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 , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Wanpeng Li , kvm@vger.kernel.org, Alexander Shishkin , "H. Peter Anvin" , linux-riscv@lists.infradead.org, Jiri Olsa , kvmarm@lists.cs.columbia.edu, Stefano Stabellini , Like Xu , Joerg Roedel , linux-csky@vger.kernel.org, xen-devel@lists.xenproject.org, Zhu Lingshan , Namhyung Kim , Artem Kashkanov , linux-arm-kernel@lists.infradead.org, Jim Mattson , Like Xu , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Vitaly Kuznetsov X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list Reply-To: Sean Christopherson List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu 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. Reviewed-by: Paolo Bonzini 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 8ffcbe29395e..e9761d84f982 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -39,6 +39,7 @@ 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 619186138176..47bdbe705a76 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 6bcd3d8ca6ac..85246dd9faa1 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 346d5aff5804..ea47ef616ee0 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1242,6 +1242,7 @@ 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 __rcu *perf_guest_cbs; static inline struct perf_guest_info_callbacks *perf_get_guest_cbs(void) { @@ -1280,6 +1281,11 @@ 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 21b1f4870c80..6bc5c56d669b 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1799,6 +1799,10 @@ 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 eb6b9cfd0054..1c8d341ecc77 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6521,6 +6521,7 @@ 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 __rcu *perf_guest_cbs; void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) @@ -6541,6 +6542,7 @@ 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, -- 2.34.0.rc0.344.g81b53c2807-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm