1 files changed, 19 insertions, 0 deletions

diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 48c6e1ac6827..b9d3a32cbc04 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -137,6 +137,8 @@ bool kvm_timer_should_fire(struct kvm_vcpu *vcpu)
 void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
 {
         struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+        bool phys_active;
+        int ret;
 
         /*
          * We're about to run this vcpu again, so there is no need to
@@ -151,6 +153,23 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
          */
         if (kvm_timer_should_fire(vcpu))
                 kvm_timer_inject_irq(vcpu);
+
+        /*
+         * We keep track of whether the edge-triggered interrupt has been
+         * signalled to the vgic/guest, and if so, we mask the interrupt and
+         * the physical distributor to prevent the timer from raising a
+         * physical interrupt whenever we run a guest, preventing forward
+         * VCPU progress.
+         */
+        if (kvm_vgic_get_phys_irq_active(timer->map))
+                phys_active = true;
+        else
+                phys_active = false;
+
+        ret = irq_set_irqchip_state(timer->map->irq,
+                                    IRQCHIP_STATE_ACTIVE,
+                                    phys_active);
+        WARN_ON(ret);
 }
 
 /**