1 files changed, 1 insertions, 1 deletions

diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c
index 5ff29be7d87a..8216c0e0b2e2 100644
--- a/arch/s390/kvm/diag.c
+++ b/arch/s390/kvm/diag.c
@@ -121,7 +121,7 @@ static int __diag_virtio_hypercall(struct kvm_vcpu *vcpu)
          * - gpr 4 contains the index on the bus (optionally)
          */
         ret = kvm_io_bus_write_cookie(vcpu->kvm, KVM_VIRTIO_CCW_NOTIFY_BUS,
-                                      vcpu->run->s.regs.gprs[2],
+                                      vcpu->run->s.regs.gprs[2] & 0xffffffff,
                                       8, &vcpu->run->s.regs.gprs[3],
                                       vcpu->run->s.regs.gprs[4]);