/* * diag.c - handling diagnose instructions * * Copyright IBM Corp. 2008 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License (version 2 only) * as published by the Free Software Foundation. * * Author(s): Carsten Otte <cotte@de.ibm.com> * Christian Borntraeger <borntraeger@de.ibm.com> */ #include <linux/kvm.h> #include <linux/kvm_host.h> #include "kvm-s390.h" static int __diag_time_slice_end(struct kvm_vcpu *vcpu) { VCPU_EVENT(vcpu, 5, "%s", "diag time slice end"); vcpu->stat.diagnose_44++; vcpu_put(vcpu); yield(); vcpu_load(vcpu); return 0; } static int __diag_ipl_functions(struct kvm_vcpu *vcpu) { unsigned int reg = vcpu->arch.sie_block->ipa & 0xf; unsigned long subcode = vcpu->arch.guest_gprs[reg] & 0xffff; VCPU_EVENT(vcpu, 5, "diag ipl functions, subcode %lx", subcode); switch (subcode) { case 3: vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR; break; case 4: vcpu->run->s390_reset_flags = 0; break; default: return -ENOTSUPP; } atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM; vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL; vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT; vcpu->run->exit_reason = KVM_EXIT_S390_RESET; VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx", vcpu->run->s390_reset_flags); return -EREMOTE; } int kvm_s390_handle_diag(struct kvm_vcpu *vcpu) { int code = (vcpu->arch.sie_block->ipb & 0xfff0000) >> 16; switch (code) { case 0x44: return __diag_time_slice_end(vcpu); case 0x308: return __diag_ipl_functions(vcpu); default: return -ENOTSUPP; } }