KVM: s390: irq routing for adapter interrupts.
Introduce a new interrupt class for s390 adapter interrupts and enable
irqfds for s390.
This is depending on a new s390 specific vm capability, KVM_CAP_S390_IRQCHIP,
that needs to be enabled by userspace.
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 2e6fbb0..ce5b659 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -196,6 +196,10 @@
return -EINVAL;
switch (cap->cap) {
+ case KVM_CAP_S390_IRQCHIP:
+ kvm->arch.use_irqchip = 1;
+ r = 0;
+ break;
default:
r = -EINVAL;
break;
@@ -228,6 +232,18 @@
r = kvm_vm_ioctl_enable_cap(kvm, &cap);
break;
}
+ case KVM_CREATE_IRQCHIP: {
+ struct kvm_irq_routing_entry routing;
+
+ r = -EINVAL;
+ if (kvm->arch.use_irqchip) {
+ /* Set up dummy routing. */
+ memset(&routing, 0, sizeof(routing));
+ kvm_set_irq_routing(kvm, &routing, 0, 0);
+ r = 0;
+ }
+ break;
+ }
default:
r = -ENOTTY;
}
@@ -284,6 +300,7 @@
}
kvm->arch.css_support = 0;
+ kvm->arch.use_irqchip = 0;
return 0;
out_nogmap: