KVM: s390: clear local interrupts at cpu initial reset

Empty list of local interrupts when vcpu goes through initial reset
to provide a clean state

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

3 files changed, 16 insertions, 0 deletions

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 79d2e4fa9f9c..05bffd74961f 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -509,6 +509,20 @@ enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
         return HRTIMER_NORESTART;
 }
 
+void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
+{
+        struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+        struct kvm_s390_interrupt_info  *n, *inti = NULL;
+
+        spin_lock_bh(&li->lock);
+        list_for_each_entry_safe(inti, n, &li->list, list) {
+                list_del(&inti->list);
+                kfree(inti);
+        }
+        atomic_set(&li->active, 0);
+        spin_unlock_bh(&li->lock);
+}
+
 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 {
         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index a02979f1e1af..83b79447de55 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -395,6 +395,7 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
         kvm_clear_async_pf_completion_queue(vcpu);
         atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
+        kvm_s390_clear_local_irqs(vcpu);
 }
 
 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index ed4750a5bc3c..6311170843b6 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -129,6 +129,7 @@ enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
 void kvm_s390_tasklet(unsigned long parm);
 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
 void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu);
+void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu);
 int __must_check kvm_s390_inject_vm(struct kvm *kvm,
                                     struct kvm_s390_interrupt *s390int);
 int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,