s390x/kvm: inject via flic

Try to inject floating interrupts via the flic if it is available.
This allows us to inject the full range of floating interrupts.

Reviewed-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

1 files changed, 18 insertions, 1 deletions

diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index a2133ff1ce..a1a4cc2cab 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -623,7 +623,7 @@ void kvm_s390_vcpu_interrupt(S390CPU *cpu, struct kvm_s390_irq *irq)
     }
 }
 
-void kvm_s390_floating_interrupt(struct kvm_s390_irq *irq)
+static void __kvm_s390_floating_interrupt(struct kvm_s390_irq *irq)
 {
     struct kvm_s390_interrupt kvmint = {};
     int r;
@@ -641,6 +641,23 @@ void kvm_s390_floating_interrupt(struct kvm_s390_irq *irq)
     }
 }
 
+void kvm_s390_floating_interrupt(struct kvm_s390_irq *irq)
+{
+    static bool use_flic = true;
+    int r;
+
+    if (use_flic) {
+        r = kvm_s390_inject_flic(irq);
+        if (r == -ENOSYS) {
+            use_flic = false;
+        }
+        if (!r) {
+            return;
+        }
+    }
+    __kvm_s390_floating_interrupt(irq);
+}
+
 void kvm_s390_virtio_irq(int config_change, uint64_t token)
 {
     struct kvm_s390_irq irq = {