kvm_hypercall4 470 arch/x86/kernel/kvm.c ret = kvm_hypercall4(KVM_HC_SEND_IPI, (unsigned long)ipi_bitmap, kvm_hypercall4 480 arch/x86/kernel/kvm.c ret = kvm_hypercall4(KVM_HC_SEND_IPI, (unsigned long)ipi_bitmap,