kvm_msi           956 include/linux/kvm_host.h int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
kvm_msi          1041 include/uapi/linux/kvm.h #define KVM_SIGNAL_MSI            _IOW(KVMIO,  0xa5, struct kvm_msi)