KVM: s390: refactor vcpu injection function

Let's provide a version of kvm_s390_inject_vcpu() that
does not acquire the local-interrupt lock and skips
waking up the vcpu.
To be used in a later patch for vcpu-local interrupt migration,
where we are already holding the lock.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 8a0786ccaf683ad69a181e80fe3454581f55e3b0..bc0988093c5ba24181f6182bb45f92d1a8765882 100644 (file)
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -1514,12 +1514,10 @@ void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
        spin_unlock(&li->lock);
 }
 
-int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
 {
-       struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
        int rc;
 
-       spin_lock(&li->lock);
        switch (irq->type) {
        case KVM_S390_PROGRAM_INT:
                VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
@@ -1559,6 +1557,17 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
        default:
                rc = -EINVAL;
        }
+
+       return rc;
+}
+
+int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+       struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+       int rc;
+
+       spin_lock(&li->lock);
+       rc = do_inject_vcpu(vcpu, irq);
        spin_unlock(&li->lock);
        if (!rc)
                kvm_s390_vcpu_wakeup(vcpu);