From f120cd6533d21075ab103ae6c225b1697853660d Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Mon, 23 Jun 2014 13:59:13 +0100 Subject: KVM: arm/arm64: timer: Allow the timer to control the active state In order to remove the crude hack where we sneak the masked bit into the timer's control register, make use of the phys_irq_map API control the active state of the interrupt. This causes some limited changes to allow for potential error propagation. Reviewed-by: Christoffer Dall Signed-off-by: Marc Zyngier --- virt/kvm/arm/arch_timer.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) (limited to 'virt') diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c index 98c95f2fcba4..76e38d231e99 100644 --- a/virt/kvm/arm/arch_timer.c +++ b/virt/kvm/arm/arch_timer.c @@ -64,10 +64,10 @@ static void kvm_timer_inject_irq(struct kvm_vcpu *vcpu) int ret; struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; - timer->cntv_ctl |= ARCH_TIMER_CTRL_IT_MASK; - ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, - timer->irq->irq, - timer->irq->level); + kvm_vgic_set_phys_irq_active(timer->map, true); + ret = kvm_vgic_inject_mapped_irq(vcpu->kvm, vcpu->vcpu_id, + timer->map, + timer->irq->level); WARN_ON(ret); } @@ -117,7 +117,8 @@ bool kvm_timer_should_fire(struct kvm_vcpu *vcpu) cycle_t cval, now; if ((timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) || - !(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE)) + !(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE) || + kvm_vgic_get_phys_irq_active(timer->map)) return false; cval = timer->cntv_cval; @@ -184,10 +185,11 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu) timer_arm(timer, ns); } -void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu, - const struct kvm_irq_level *irq) +int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu, + const struct kvm_irq_level *irq) { struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + struct irq_phys_map *map; /* * The vcpu timer irq number cannot be determined in @@ -196,6 +198,17 @@ void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu, * vcpu timer irq number when the vcpu is reset. */ timer->irq = irq; + + /* + * Tell the VGIC that the virtual interrupt is tied to a + * physical interrupt. We do that once per VCPU. + */ + map = kvm_vgic_map_phys_irq(vcpu, irq->irq, host_vtimer_irq); + if (WARN_ON(IS_ERR(map))) + return PTR_ERR(map); + + timer->map = map; + return 0; } void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu) @@ -335,6 +348,8 @@ void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu) struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; timer_disarm(timer); + if (timer->map) + kvm_vgic_unmap_phys_irq(vcpu, timer->map); } void kvm_timer_enable(struct kvm *kvm) -- cgit v1.2.3-59-g8ed1b