From: Christoffer Dall <christoffer.dall@linaro.org> To: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Cc: Marc Zyngier <marc.zyngier@arm.com>, Andre Przywara <andre.przywara@arm.com>, kvm@vger.kernel.org Subject: [PATCH 1/3] KVM: arm/arm64: Fix preemptible timer active state crazyness Date: Tue, 24 Nov 2015 16:43:58 +0100 [thread overview] Message-ID: <1448379840-17516-2-git-send-email-christoffer.dall@linaro.org> (raw) In-Reply-To: <1448379840-17516-1-git-send-email-christoffer.dall@linaro.org> We were setting the physical active state on the GIC distributor in a preemptible section, which could cause us to set the active state on different physical CPU from the one we were actually going to run on, hacoc ensues. Since we are no longer descheduling/scheduling soft timers in the flush/sync timer functions, simply moving the timer flush into a non-preemptible section. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> --- arch/arm/kvm/arm.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index eab83b2..e06fd29 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -564,17 +564,12 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) vcpu_sleep(vcpu); /* - * Disarming the background timer must be done in a - * preemptible context, as this call may sleep. - */ - kvm_timer_flush_hwstate(vcpu); - - /* * Preparing the interrupts to be injected also * involves poking the GIC, which must be done in a * non-preemptible context. */ preempt_disable(); + kvm_timer_flush_hwstate(vcpu); kvm_vgic_flush_hwstate(vcpu); local_irq_disable(); -- 2.1.2.330.g565301e.dirty
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From: christoffer.dall@linaro.org (Christoffer Dall) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/3] KVM: arm/arm64: Fix preemptible timer active state crazyness Date: Tue, 24 Nov 2015 16:43:58 +0100 [thread overview] Message-ID: <1448379840-17516-2-git-send-email-christoffer.dall@linaro.org> (raw) In-Reply-To: <1448379840-17516-1-git-send-email-christoffer.dall@linaro.org> We were setting the physical active state on the GIC distributor in a preemptible section, which could cause us to set the active state on different physical CPU from the one we were actually going to run on, hacoc ensues. Since we are no longer descheduling/scheduling soft timers in the flush/sync timer functions, simply moving the timer flush into a non-preemptible section. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> --- arch/arm/kvm/arm.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index eab83b2..e06fd29 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -564,17 +564,12 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) vcpu_sleep(vcpu); /* - * Disarming the background timer must be done in a - * preemptible context, as this call may sleep. - */ - kvm_timer_flush_hwstate(vcpu); - - /* * Preparing the interrupts to be injected also * involves poking the GIC, which must be done in a * non-preemptible context. */ preempt_disable(); + kvm_timer_flush_hwstate(vcpu); kvm_vgic_flush_hwstate(vcpu); local_irq_disable(); -- 2.1.2.330.g565301e.dirty
next prev parent reply other threads:[~2015-11-24 15:43 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-11-24 15:43 [PATCH 0/3] KVM: arm/arm64: Fix some more timer related issues Christoffer Dall 2015-11-24 15:43 ` Christoffer Dall 2015-11-24 15:43 ` Christoffer Dall [this message] 2015-11-24 15:43 ` [PATCH 1/3] KVM: arm/arm64: Fix preemptible timer active state crazyness Christoffer Dall 2015-11-24 15:51 ` Marc Zyngier 2015-11-24 15:51 ` Marc Zyngier 2015-11-24 15:51 ` Marc Zyngier 2015-11-24 15:43 ` [PATCH 2/3] KVM: arm/arm64: arch_timer: Preserve physical dist. active state on LR.active Christoffer Dall 2015-11-24 15:43 ` Christoffer Dall 2015-11-24 16:11 ` Marc Zyngier 2015-11-24 16:11 ` Marc Zyngier 2015-11-24 16:11 ` Marc Zyngier 2015-11-24 15:44 ` [PATCH 3/3] KVM: arm/arm64: vgic: Trust the LR state for HW IRQs Christoffer Dall 2015-11-24 15:44 ` Christoffer Dall 2015-11-24 16:13 ` Marc Zyngier 2015-11-24 16:13 ` Marc Zyngier 2015-11-24 16:13 ` Marc Zyngier
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