KVM: arm/arm64: timer: Workaround misconfigured timer interrupt

[cascardo/linux.git] / virt / kvm / arm / arch_timer.c

diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 4fde8c7..77e6ccf 100644 (file)
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -33,6 +33,7 @@
 static struct timecounter *timecounter;
 static struct workqueue_struct *wqueue;
 static unsigned int host_vtimer_irq;
+static u32 host_vtimer_irq_flags;
 
 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu)
 {
@@ -365,7 +366,7 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
 
 static void kvm_timer_init_interrupt(void *info)
 {
-       enable_percpu_irq(host_vtimer_irq, 0);
+       enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags);
 }
 
 int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
@@ -432,6 +433,14 @@ int kvm_timer_hyp_init(void)
        }
        host_vtimer_irq = info->virtual_irq;
 
+       host_vtimer_irq_flags = irq_get_trigger_type(host_vtimer_irq);
+       if (host_vtimer_irq_flags != IRQF_TRIGGER_HIGH &&
+           host_vtimer_irq_flags != IRQF_TRIGGER_LOW) {
+               kvm_err("Invalid trigger for IRQ%d, assuming level low\n",
+                       host_vtimer_irq);
+               host_vtimer_irq_flags = IRQF_TRIGGER_LOW;
+       }
+
        err = request_percpu_irq(host_vtimer_irq, kvm_arch_timer_handler,
                                 "kvm guest timer", kvm_get_running_vcpus());
        if (err) {