s390/kvm: Interrupt injection bugfix

EXTERNAL_CALL and EMERGENCY type interrupts need to preserve their interrupt
code parameter when being injected from user space.

Signed-off-by: Jason J. Herne <jjherne@us.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 18 insertions, 1 deletions

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index ff1e2f8ef94a..c30615e605ac 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -629,10 +629,27 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
                 break;
         case KVM_S390_SIGP_STOP:
         case KVM_S390_RESTART:
+                VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
+                inti->type = s390int->type;
+                break;
         case KVM_S390_INT_EXTERNAL_CALL:
+                if (s390int->parm & 0xffff0000) {
+                        kfree(inti);
+                        return -EINVAL;
+                }
+                VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
+                           s390int->parm);
+                inti->type = s390int->type;
+                inti->extcall.code = s390int->parm;
+                break;
         case KVM_S390_INT_EMERGENCY:
-                VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
+                if (s390int->parm & 0xffff0000) {
+                        kfree(inti);
+                        return -EINVAL;
+                }
+                VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
                 inti->type = s390int->type;
+                inti->emerg.code = s390int->parm;
                 break;
         case KVM_S390_INT_VIRTIO:
         case KVM_S390_INT_SERVICE: