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1// SPDX-License-Identifier: GPL-2.02/*3 * ucall support. A ucall is a "hypercall to userspace".4 *5 * Copyright (C) 2019 Red Hat, Inc.6 */7#include "kvm_util.h"8 9void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu)10{11 struct kvm_run *run = vcpu->run;12 13 if (run->exit_reason == KVM_EXIT_S390_SIEIC &&14 run->s390_sieic.icptcode == 4 &&15 (run->s390_sieic.ipa >> 8) == 0x83 && /* 0x83 means DIAGNOSE */16 (run->s390_sieic.ipb >> 16) == 0x501) {17 int reg = run->s390_sieic.ipa & 0xf;18 19 return (void *)run->s.regs.gprs[reg];20 }21 return NULL;22}23