From patchwork Thu Sep 22 18:20:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Isaku Yamahata X-Patchwork-Id: 12985650 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 121CEECAAD8 for ; Thu, 22 Sep 2022 18:21:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232366AbiIVSVj (ORCPT ); Thu, 22 Sep 2022 14:21:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34588 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231510AbiIVSVZ (ORCPT ); Thu, 22 Sep 2022 14:21:25 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5A97710AB19; Thu, 22 Sep 2022 11:21:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1663870884; x=1695406884; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=zJVDnDziwHyux/2eNta6aSYKvcSSvYnXO9CPyXFOSmw=; b=gqvQqNC2K31GhUO4wDpoaG1o5ewnLtphVmcNsO/Sma9q9JFgFhXHZcmM BR8gqGAFYxbeO3oxgp5m5rxtwagvFQJa8nozC0tXUcE+p9U/Ei8Y1iWMh 09Gt8GirhAHC4P7qM9SdFpmOnli2ueVFO7Nc54T3S0LB+vUgR/mlwZ6Uj 9FS5koj2uDncpRH64DWcJd5g/9mVpr7ECCUpZI2nJF3UNROWd2nm8Pi9Q YZrIDOWafi119CDwE+9ml/LDd/9/NVorXNGSmcvSBvP0B3xzROSNBP2q4 OfmK8OUT9q1WWs3JYjulyeWmBGYDqMvj1ZAEERbS0ud8awGVBWdId4+97 A==; X-IronPort-AV: E=McAfee;i="6500,9779,10478"; a="386675960" X-IronPort-AV: E=Sophos;i="5.93,337,1654585200"; d="scan'208";a="386675960" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2022 11:21:16 -0700 X-IronPort-AV: E=Sophos;i="5.93,337,1654585200"; d="scan'208";a="653086663" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2022 11:21:15 -0700 From: isaku.yamahata@intel.com To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Paolo Bonzini , Sean Christopherson , Thomas Gleixner , Marc Zyngier , Will Deacon Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, Kai Huang , Chao Gao , Atish Patra , Shaokun Zhang , Daniel Lezcano , Huang Ying , Huacai Chen , Dave Hansen , Borislav Petkov Subject: [PATCH v5 06/30] KVM: arm64: Simplify the CPUHP logic Date: Thu, 22 Sep 2022 11:20:35 -0700 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Marc Zyngier For a number of historical reasons, the KVM/arm64 hotplug setup is pretty complicated, and we have two extra CPUHP notifiers for vGIC and timers. It looks pretty pointless, and gets in the way of further changes. So let's just expose some helpers that can be called from the core CPUHP callback, and get rid of everything else. This gives us the opportunity to drop a useless notifier entry, as well as tidy-up the timer enable/disable, which was a bit odd. Signed-off-by: Marc Zyngier Signed-off-by: Isaku Yamahata --- arch/arm64/kvm/arch_timer.c | 27 ++++++++++----------------- arch/arm64/kvm/arm.c | 13 +++++++++++++ arch/arm64/kvm/vgic/vgic-init.c | 19 ++----------------- include/kvm/arm_arch_timer.h | 4 ++++ include/kvm/arm_vgic.h | 4 ++++ include/linux/cpuhotplug.h | 3 --- 6 files changed, 33 insertions(+), 37 deletions(-) diff --git a/arch/arm64/kvm/arch_timer.c b/arch/arm64/kvm/arch_timer.c index bb24a76b4224..33fca1a691a5 100644 --- a/arch/arm64/kvm/arch_timer.c +++ b/arch/arm64/kvm/arch_timer.c @@ -811,10 +811,18 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu) ptimer->host_timer_irq_flags = host_ptimer_irq_flags; } -static void kvm_timer_init_interrupt(void *info) +void kvm_timer_cpu_up(void) { enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags); - enable_percpu_irq(host_ptimer_irq, host_ptimer_irq_flags); + if (host_ptimer_irq) + enable_percpu_irq(host_ptimer_irq, host_ptimer_irq_flags); +} + +void kvm_timer_cpu_down(void) +{ + disable_percpu_irq(host_vtimer_irq); + if (host_ptimer_irq) + disable_percpu_irq(host_ptimer_irq); } int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value) @@ -976,18 +984,6 @@ void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu, preempt_enable(); } -static int kvm_timer_starting_cpu(unsigned int cpu) -{ - kvm_timer_init_interrupt(NULL); - return 0; -} - -static int kvm_timer_dying_cpu(unsigned int cpu) -{ - disable_percpu_irq(host_vtimer_irq); - return 0; -} - static int timer_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu) { if (vcpu) @@ -1185,9 +1181,6 @@ int kvm_timer_hyp_init(bool has_gic) goto out_free_irq; } - cpuhp_setup_state(CPUHP_AP_KVM_ARM_TIMER_STARTING, - "kvm/arm/timer:starting", kvm_timer_starting_cpu, - kvm_timer_dying_cpu); return 0; out_free_irq: free_percpu_irq(host_vtimer_irq, kvm_get_running_vcpus()); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 3385fb57c11a..7e83498b83aa 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1676,7 +1676,15 @@ static void _kvm_arch_hardware_enable(void *discard) int kvm_arch_hardware_enable(void) { + int was_enabled = __this_cpu_read(kvm_arm_hardware_enabled); + _kvm_arch_hardware_enable(NULL); + + if (!was_enabled) { + kvm_vgic_cpu_up(); + kvm_timer_cpu_up(); + } + return 0; } @@ -1690,6 +1698,11 @@ static void _kvm_arch_hardware_disable(void *discard) void kvm_arch_hardware_disable(void) { + if (__this_cpu_read(kvm_arm_hardware_enabled)) { + kvm_timer_cpu_down(); + kvm_vgic_cpu_down(); + } + if (!is_protected_kvm_enabled()) _kvm_arch_hardware_disable(NULL); } diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c index f6d4f4052555..6c7f6ae21ec0 100644 --- a/arch/arm64/kvm/vgic/vgic-init.c +++ b/arch/arm64/kvm/vgic/vgic-init.c @@ -465,17 +465,15 @@ int kvm_vgic_map_resources(struct kvm *kvm) /* GENERIC PROBE */ -static int vgic_init_cpu_starting(unsigned int cpu) +void kvm_vgic_cpu_up(void) { enable_percpu_irq(kvm_vgic_global_state.maint_irq, 0); - return 0; } -static int vgic_init_cpu_dying(unsigned int cpu) +void kvm_vgic_cpu_down(void) { disable_percpu_irq(kvm_vgic_global_state.maint_irq); - return 0; } static irqreturn_t vgic_maintenance_handler(int irq, void *data) @@ -584,19 +582,6 @@ int kvm_vgic_hyp_init(void) return ret; } - ret = cpuhp_setup_state(CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING, - "kvm/arm/vgic:starting", - vgic_init_cpu_starting, vgic_init_cpu_dying); - if (ret) { - kvm_err("Cannot register vgic CPU notifier\n"); - goto out_free_irq; - } - kvm_info("vgic interrupt IRQ%d\n", kvm_vgic_global_state.maint_irq); return 0; - -out_free_irq: - free_percpu_irq(kvm_vgic_global_state.maint_irq, - kvm_get_running_vcpus()); - return ret; } diff --git a/include/kvm/arm_arch_timer.h b/include/kvm/arm_arch_timer.h index cd6d8f260eab..1638418f72dd 100644 --- a/include/kvm/arm_arch_timer.h +++ b/include/kvm/arm_arch_timer.h @@ -104,4 +104,8 @@ void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu, u32 timer_get_ctl(struct arch_timer_context *ctxt); u64 timer_get_cval(struct arch_timer_context *ctxt); +/* CPU HP callbacks */ +void kvm_timer_cpu_up(void); +void kvm_timer_cpu_down(void); + #endif diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 4df9e73a8bb5..fc4acc91ba06 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -431,4 +431,8 @@ int vgic_v4_load(struct kvm_vcpu *vcpu); void vgic_v4_commit(struct kvm_vcpu *vcpu); int vgic_v4_put(struct kvm_vcpu *vcpu, bool need_db); +/* CPU HP callbacks */ +void kvm_vgic_cpu_up(void); +void kvm_vgic_cpu_down(void); + #endif /* __KVM_ARM_VGIC_H */ diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index f61447913db9..7337414e4947 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -186,9 +186,6 @@ enum cpuhp_state { CPUHP_AP_TI_GP_TIMER_STARTING, CPUHP_AP_HYPERV_TIMER_STARTING, CPUHP_AP_KVM_STARTING, - CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING, - CPUHP_AP_KVM_ARM_VGIC_STARTING, - CPUHP_AP_KVM_ARM_TIMER_STARTING, /* Must be the last timer callback */ CPUHP_AP_DUMMY_TIMER_STARTING, CPUHP_AP_ARM_XEN_STARTING,