Logo Search packages:      
Sourcecode: linux version File versions  Download package

intercept.c

/*
 * intercept.c - in-kernel handling for sie intercepts
 *
 * 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_host.h>
#include <linux/errno.h>
#include <linux/pagemap.h>

#include <asm/kvm_host.h>

#include "kvm-s390.h"
#include "gaccess.h"

static int handle_lctlg(struct kvm_vcpu *vcpu)
{
      int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
      int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
      int base2 = vcpu->arch.sie_block->ipb >> 28;
      int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
                  ((vcpu->arch.sie_block->ipb & 0xff00) << 4);
      u64 useraddr;
      int reg, rc;

      vcpu->stat.instruction_lctlg++;
      if ((vcpu->arch.sie_block->ipb & 0xff) != 0x2f)
            return -ENOTSUPP;

      useraddr = disp2;
      if (base2)
            useraddr += vcpu->arch.guest_gprs[base2];

      if (useraddr & 7)
            return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

      reg = reg1;

      VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
               disp2);

      do {
            rc = get_guest_u64(vcpu, useraddr,
                           &vcpu->arch.sie_block->gcr[reg]);
            if (rc == -EFAULT) {
                  kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
                  break;
            }
            useraddr += 8;
            if (reg == reg3)
                  break;
            reg = (reg + 1) % 16;
      } while (1);
      return 0;
}

static int handle_lctl(struct kvm_vcpu *vcpu)
{
      int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
      int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
      int base2 = vcpu->arch.sie_block->ipb >> 28;
      int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
      u64 useraddr;
      u32 val = 0;
      int reg, rc;

      vcpu->stat.instruction_lctl++;

      useraddr = disp2;
      if (base2)
            useraddr += vcpu->arch.guest_gprs[base2];

      if (useraddr & 3)
            return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

      VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
               disp2);

      reg = reg1;
      do {
            rc = get_guest_u32(vcpu, useraddr, &val);
            if (rc == -EFAULT) {
                  kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
                  break;
            }
            vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
            vcpu->arch.sie_block->gcr[reg] |= val;
            useraddr += 4;
            if (reg == reg3)
                  break;
            reg = (reg + 1) % 16;
      } while (1);
      return 0;
}

static intercept_handler_t instruction_handlers[256] = {
      [0x83] = kvm_s390_handle_diag,
      [0xae] = kvm_s390_handle_sigp,
      [0xb2] = kvm_s390_handle_priv,
      [0xb7] = handle_lctl,
      [0xeb] = handle_lctlg,
};

static int handle_noop(struct kvm_vcpu *vcpu)
{
      switch (vcpu->arch.sie_block->icptcode) {
      case 0x0:
            vcpu->stat.exit_null++;
            break;
      case 0x10:
            vcpu->stat.exit_external_request++;
            break;
      case 0x14:
            vcpu->stat.exit_external_interrupt++;
            break;
      default:
            break; /* nothing */
      }
      return 0;
}

static int handle_stop(struct kvm_vcpu *vcpu)
{
      int rc;

      vcpu->stat.exit_stop_request++;
      atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
      spin_lock_bh(&vcpu->arch.local_int.lock);
      if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
            vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
            rc = __kvm_s390_vcpu_store_status(vcpu,
                                      KVM_S390_STORE_STATUS_NOADDR);
            if (rc >= 0)
                  rc = -ENOTSUPP;
      }

      if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
            vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
            VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
            rc = -ENOTSUPP;
      } else
            rc = 0;
      spin_unlock_bh(&vcpu->arch.local_int.lock);
      return rc;
}

static int handle_validity(struct kvm_vcpu *vcpu)
{
      int viwhy = vcpu->arch.sie_block->ipb >> 16;
      vcpu->stat.exit_validity++;
      if (viwhy == 0x37) {
            fault_in_pages_writeable((char __user *)
                               vcpu->kvm->arch.guest_origin +
                               vcpu->arch.sie_block->prefix,
                               PAGE_SIZE);
            return 0;
      }
      VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
               viwhy);
      return -ENOTSUPP;
}

static int handle_instruction(struct kvm_vcpu *vcpu)
{
      intercept_handler_t handler;

      vcpu->stat.exit_instruction++;
      handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
      if (handler)
            return handler(vcpu);
      return -ENOTSUPP;
}

static int handle_prog(struct kvm_vcpu *vcpu)
{
      vcpu->stat.exit_program_interruption++;
      return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc);
}

static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
{
      int rc, rc2;

      vcpu->stat.exit_instr_and_program++;
      rc = handle_instruction(vcpu);
      rc2 = handle_prog(vcpu);

      if (rc == -ENOTSUPP)
            vcpu->arch.sie_block->icptcode = 0x04;
      if (rc)
            return rc;
      return rc2;
}

static const intercept_handler_t intercept_funcs[0x48 >> 2] = {
      [0x00 >> 2] = handle_noop,
      [0x04 >> 2] = handle_instruction,
      [0x08 >> 2] = handle_prog,
      [0x0C >> 2] = handle_instruction_and_prog,
      [0x10 >> 2] = handle_noop,
      [0x14 >> 2] = handle_noop,
      [0x1C >> 2] = kvm_s390_handle_wait,
      [0x20 >> 2] = handle_validity,
      [0x28 >> 2] = handle_stop,
};

int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
{
      intercept_handler_t func;
      u8 code = vcpu->arch.sie_block->icptcode;

      if (code & 3 || code > 0x48)
            return -ENOTSUPP;
      func = intercept_funcs[code >> 2];
      if (func)
            return func(vcpu);
      return -ENOTSUPP;
}

Generated by  Doxygen 1.6.0   Back to index