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diag.c

/*
 * 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 %lx",
        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;
      }
}

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