From nobody Mon Feb 9 05:22:26 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49E2FC4332F for ; Wed, 2 Nov 2022 23:25:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231484AbiKBXZn (ORCPT ); Wed, 2 Nov 2022 19:25:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231288AbiKBXYL (ORCPT ); Wed, 2 Nov 2022 19:24:11 -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 C572B271D for ; Wed, 2 Nov 2022 16:20:28 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id t9-20020a5b03c9000000b006cff5077dc9so395916ybp.3 for ; Wed, 02 Nov 2022 16:20:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=nvDOwkn7hwg+zfvJUXf8AHfTsU5S0iCSbbYe/XAvrQI=; b=kPsyz565Bs3nWd/vXeOuSWMgvIdI7+RJdtnuc0znmJIjMQ8uzXLRwKs8W7PumGf1FB TInnWKg6dZjNDAKuYUbWAGztsfGiZ+tk8yY6bKPVrq1xzztMo8xlFpqIJ6lhzJTHDPrm lou7lyJZKFxoJ8wozjn3uJXVRhz+EYknGTCWfTAQUsNnFbSP/SLgEfh6MyRvKfldCG8U pqOyiOjbRpZeYdvtQ7S7c4kgRIPHFaJSoTRioybyXKPMMU3h/v/TNXPFUOrsn8FChvzn JAwsqVkjZPDDeC2WWvWJ0112+KgndOYyfFTaXcofTGWmMGiul8k48NIfwWZFm0EpNX4X UhZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=nvDOwkn7hwg+zfvJUXf8AHfTsU5S0iCSbbYe/XAvrQI=; b=0u7ehnu5jUkSH/OGR/5uSblsN2qXtoG/ytkReGRIjwv/RWoe7YoGBx6db5bbYo6KV/ FCEq3/9Xsf7E1eGdUDwaDlFD4st8FrumUxJ6Bes4qHDd5D5C5ElBFTuXDpq1+xDKCXp9 bz/CUxoOqNOIOV5WsNvSRN5l/4OWp0yApJNbvF622/96kX9ruxXwpLiX6SESg8Xt/sUC 6JZs8USXt/fHjtC6nzwca/kWvY6Rxd8LLQvXYFZhwTN/K/V93ZL7NS9iGCUM2990CXPi TNFIy9rxC7hIrLIh4JndkfL5WvR2NA9I9QuLPGYn2tIEQWFRXaAtwNqn+0lBBNPNITDv iyNg== X-Gm-Message-State: ACrzQf2Qio+HfBzSfTeMv2cb2w+kC2bfLBt0MtuZ3xQ6ou0gdXVBqa5P wGJ7kaTh/a9jBlvfBeI9G9gPQkRm5C8= X-Google-Smtp-Source: AMsMyM5eowv7lcJiOd868nUuFM6ikjnC3RuvYPPk5CroI1jtu45SCXqk7PcUOxGjfgiO1DuVsExFVnovkSQ= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:690c:b9b:b0:367:7d5a:3403 with SMTP id ck27-20020a05690c0b9b00b003677d5a3403mr179885ywb.148.1667431228175; Wed, 02 Nov 2022 16:20:28 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 2 Nov 2022 23:19:10 +0000 In-Reply-To: <20221102231911.3107438-1-seanjc@google.com> Mime-Version: 1.0 References: <20221102231911.3107438-1-seanjc@google.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog Message-ID: <20221102231911.3107438-44-seanjc@google.com> Subject: [PATCH 43/44] KVM: Register syscore (suspend/resume) ops early in kvm_init() From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Matthew Rosato , Eric Farman , Sean Christopherson , Vitaly Kuznetsov Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Atish Patra , David Hildenbrand , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Isaku Yamahata , Fabiano Rosas , Michael Ellerman , Chao Gao , Thomas Gleixner , Yuan Yao Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Register the suspend/resume notifier hooks at the same time KVM registers its reboot notifier so that all the code in kvm_init() that deals with enabling/disabling hardware is bundled together. Opportunstically move KVM's implementations to reside near the reboot notifier code for the same reason. Bunching the code together will allow architectures to opt out of KVM's generic hardware enable/disable logic with minimal #ifdeffery. Signed-off-by: Sean Christopherson --- virt/kvm/kvm_main.c | 64 ++++++++++++++++++++++----------------------- 1 file changed, 32 insertions(+), 32 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index a18296ee731b..859bc27091cd 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5142,6 +5142,36 @@ static struct notifier_block kvm_reboot_notifier =3D= { .priority =3D 0, }; =20 +static int kvm_suspend(void) +{ + /* + * Secondary CPUs and CPU hotplug are disabled across the suspend/resume + * callbacks, i.e. no need to acquire kvm_lock to ensure the usage count + * is stable. Assert that kvm_lock is not held as a paranoid sanity + * check that the system isn't suspended when KVM is enabling hardware. + */ + lockdep_assert_not_held(&kvm_lock); + lockdep_assert_irqs_disabled(); + + if (kvm_usage_count) + hardware_disable_nolock(NULL); + return 0; +} + +static void kvm_resume(void) +{ + lockdep_assert_not_held(&kvm_lock); + lockdep_assert_irqs_disabled(); + + if (kvm_usage_count) + WARN_ON_ONCE(__hardware_enable_nolock()); +} + +static struct syscore_ops kvm_syscore_ops =3D { + .suspend =3D kvm_suspend, + .resume =3D kvm_resume, +}; + static void kvm_io_bus_destroy(struct kvm_io_bus *bus) { int i; @@ -5720,36 +5750,6 @@ static void kvm_init_debug(void) } } =20 -static int kvm_suspend(void) -{ - /* - * Secondary CPUs and CPU hotplug are disabled across the suspend/resume - * callbacks, i.e. no need to acquire kvm_lock to ensure the usage count - * is stable. Assert that kvm_lock is not held as a paranoid sanity - * check that the system isn't suspended when KVM is enabling hardware. - */ - lockdep_assert_not_held(&kvm_lock); - lockdep_assert_irqs_disabled(); - - if (kvm_usage_count) - hardware_disable_nolock(NULL); - return 0; -} - -static void kvm_resume(void) -{ - lockdep_assert_not_held(&kvm_lock); - lockdep_assert_irqs_disabled(); - - if (kvm_usage_count) - WARN_ON_ONCE(__hardware_enable_nolock()); -} - -static struct syscore_ops kvm_syscore_ops =3D { - .suspend =3D kvm_suspend, - .resume =3D kvm_resume, -}; - static inline struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) { @@ -5865,6 +5865,7 @@ int kvm_init(unsigned vcpu_size, unsigned vcpu_align,= struct module *module) return r; =20 register_reboot_notifier(&kvm_reboot_notifier); + register_syscore_ops(&kvm_syscore_ops); =20 /* A kmem cache lets us meet the alignment requirements of fx_save. */ if (!vcpu_align) @@ -5899,8 +5900,6 @@ int kvm_init(unsigned vcpu_size, unsigned vcpu_align,= struct module *module) =20 kvm_chardev_ops.owner =3D module; =20 - register_syscore_ops(&kvm_syscore_ops); - kvm_preempt_ops.sched_in =3D kvm_sched_in; kvm_preempt_ops.sched_out =3D kvm_sched_out; =20 @@ -5934,6 +5933,7 @@ int kvm_init(unsigned vcpu_size, unsigned vcpu_align,= struct module *module) free_cpumask_var(per_cpu(cpu_kick_mask, cpu)); kmem_cache_destroy(kvm_vcpu_cache); out_free_3: + unregister_syscore_ops(&kvm_syscore_ops); unregister_reboot_notifier(&kvm_reboot_notifier); cpuhp_remove_state_nocalls(CPUHP_AP_KVM_ONLINE); return r; --=20 2.38.1.431.g37b22c650d-goog