From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoffer Dall Subject: [PATCH v5 09/20] KVM: arm/arm64: Move timer/vgic flush/sync under disabled irq Date: Fri, 27 Oct 2017 10:34:30 +0200 Message-ID: <1509093281-15225-10-git-send-email-cdall@linaro.org> References: <1509093281-15225-1-git-send-email-cdall@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 79DD849D36 for ; Fri, 27 Oct 2017 04:34:26 -0400 (EDT) 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 5LIEP2mdnJMa for ; Fri, 27 Oct 2017 04:34:25 -0400 (EDT) Received: from mail-lf0-f68.google.com (mail-lf0-f68.google.com [209.85.215.68]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 6B15849D29 for ; Fri, 27 Oct 2017 04:34:25 -0400 (EDT) Received: by mail-lf0-f68.google.com with SMTP id n69so6544097lfn.2 for ; Fri, 27 Oct 2017 01:35:50 -0700 (PDT) In-Reply-To: <1509093281-15225-1-git-send-email-cdall@linaro.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Cc: Christoffer Dall , kvm@vger.kernel.org, Marc Zyngier , Catalin Marinas , Will Deacon List-Id: kvmarm@lists.cs.columbia.edu As we are about to play tricks with the timer to be more lazy in saving and restoring state, we need to move the timer sync and flush functions under a disabled irq section and since we have to flush the vgic state after the timer and PMU state, we do the whole flush/sync sequence with disabled irqs. The only downside is a slightly longer delay before being able to process hardware interrupts and run softirqs. Signed-off-by: Christoffer Dall Reviewed-by: Marc Zyngier --- virt/kvm/arm/arm.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index b9f68e4..27db222 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -654,11 +654,11 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) kvm_pmu_flush_hwstate(vcpu); + local_irq_disable(); + kvm_timer_flush_hwstate(vcpu); kvm_vgic_flush_hwstate(vcpu); - local_irq_disable(); - /* * If we have a singal pending, or need to notify a userspace * irqchip about timer or PMU level changes, then we exit (and @@ -683,10 +683,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) || kvm_request_pending(vcpu)) { vcpu->mode = OUTSIDE_GUEST_MODE; - local_irq_enable(); kvm_pmu_sync_hwstate(vcpu); kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); + local_irq_enable(); preempt_enable(); continue; } @@ -710,6 +710,16 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) kvm_arm_clear_debug(vcpu); /* + * We must sync the PMU and timer state before the vgic state so + * that the vgic can properly sample the updated state of the + * interrupt line. + */ + kvm_pmu_sync_hwstate(vcpu); + kvm_timer_sync_hwstate(vcpu); + + kvm_vgic_sync_hwstate(vcpu); + + /* * We may have taken a host interrupt in HYP mode (ie * while executing the guest). This interrupt is still * pending, as we haven't serviced it yet! @@ -732,16 +742,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) guest_exit(); trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu)); - /* - * We must sync the PMU and timer state before the vgic state so - * that the vgic can properly sample the updated state of the - * interrupt line. - */ - kvm_pmu_sync_hwstate(vcpu); - kvm_timer_sync_hwstate(vcpu); - - kvm_vgic_sync_hwstate(vcpu); - preempt_enable(); ret = handle_exit(vcpu, run, ret); -- 2.7.4