162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * ucall support. A ucall is a "hypercall to userspace". 462306a36Sopenharmony_ci * 562306a36Sopenharmony_ci * Copyright (C) 2019 Red Hat, Inc. 662306a36Sopenharmony_ci */ 762306a36Sopenharmony_ci#include "kvm_util.h" 862306a36Sopenharmony_ci 962306a36Sopenharmony_civoid *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) 1062306a36Sopenharmony_ci{ 1162306a36Sopenharmony_ci struct kvm_run *run = vcpu->run; 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci if (run->exit_reason == KVM_EXIT_S390_SIEIC && 1462306a36Sopenharmony_ci run->s390_sieic.icptcode == 4 && 1562306a36Sopenharmony_ci (run->s390_sieic.ipa >> 8) == 0x83 && /* 0x83 means DIAGNOSE */ 1662306a36Sopenharmony_ci (run->s390_sieic.ipb >> 16) == 0x501) { 1762306a36Sopenharmony_ci int reg = run->s390_sieic.ipa & 0xf; 1862306a36Sopenharmony_ci 1962306a36Sopenharmony_ci return (void *)run->s.regs.gprs[reg]; 2062306a36Sopenharmony_ci } 2162306a36Sopenharmony_ci return NULL; 2262306a36Sopenharmony_ci} 23