Logo Search packages:      
Sourcecode: linux version File versions

sigp.c

/*
 * sigp.c - handlinge interprocessor communication
 *
 * 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 "gaccess.h"
#include "kvm-s390.h"

/* sigp order codes */
#define SIGP_SENSE             0x01
#define SIGP_EXTERNAL_CALL     0x02
#define SIGP_EMERGENCY         0x03
#define SIGP_START             0x04
#define SIGP_STOP              0x05
#define SIGP_RESTART           0x06
#define SIGP_STOP_STORE_STATUS 0x09
#define SIGP_INITIAL_CPU_RESET 0x0b
#define SIGP_CPU_RESET         0x0c
#define SIGP_SET_PREFIX        0x0d
#define SIGP_STORE_STATUS_ADDR 0x0e
#define SIGP_SET_ARCH          0x12

/* cpu status bits */
#define SIGP_STAT_EQUIPMENT_CHECK   0x80000000UL
#define SIGP_STAT_INCORRECT_STATE   0x00000200UL
#define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
#define SIGP_STAT_EXT_CALL_PENDING  0x00000080UL
#define SIGP_STAT_STOPPED           0x00000040UL
#define SIGP_STAT_OPERATOR_INTERV   0x00000020UL
#define SIGP_STAT_CHECK_STOP        0x00000010UL
#define SIGP_STAT_INOPERATIVE       0x00000004UL
#define SIGP_STAT_INVALID_ORDER     0x00000002UL
#define SIGP_STAT_RECEIVER_CHECK    0x00000001UL


static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
                  unsigned long *reg)
{
      struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
      int rc;

      if (cpu_addr >= KVM_MAX_VCPUS)
            return 3; /* not operational */

      spin_lock_bh(&fi->lock);
      if (fi->local_int[cpu_addr] == NULL)
            rc = 3; /* not operational */
      else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
             & CPUSTAT_RUNNING) {
            *reg &= 0xffffffff00000000UL;
            rc = 1; /* status stored */
      } else {
            *reg &= 0xffffffff00000000UL;
            *reg |= SIGP_STAT_STOPPED;
            rc = 1; /* status stored */
      }
      spin_unlock_bh(&fi->lock);

      VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
      return rc;
}

static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
{
      struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
      struct kvm_s390_local_interrupt *li;
      struct kvm_s390_interrupt_info *inti;
      int rc;

      if (cpu_addr >= KVM_MAX_VCPUS)
            return 3; /* not operational */

      inti = kzalloc(sizeof(*inti), GFP_KERNEL);
      if (!inti)
            return -ENOMEM;

      inti->type = KVM_S390_INT_EMERGENCY;

      spin_lock_bh(&fi->lock);
      li = fi->local_int[cpu_addr];
      if (li == NULL) {
            rc = 3; /* not operational */
            kfree(inti);
            goto unlock;
      }
      spin_lock_bh(&li->lock);
      list_add_tail(&inti->list, &li->list);
      atomic_set(&li->active, 1);
      atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
      if (waitqueue_active(&li->wq))
            wake_up_interruptible(&li->wq);
      spin_unlock_bh(&li->lock);
      rc = 0; /* order accepted */
unlock:
      spin_unlock_bh(&fi->lock);
      VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
      return rc;
}

static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int store)
{
      struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
      struct kvm_s390_local_interrupt *li;
      struct kvm_s390_interrupt_info *inti;
      int rc;

      if (cpu_addr >= KVM_MAX_VCPUS)
            return 3; /* not operational */

      inti = kzalloc(sizeof(*inti), GFP_KERNEL);
      if (!inti)
            return -ENOMEM;

      inti->type = KVM_S390_SIGP_STOP;

      spin_lock_bh(&fi->lock);
      li = fi->local_int[cpu_addr];
      if (li == NULL) {
            rc = 3; /* not operational */
            kfree(inti);
            goto unlock;
      }
      spin_lock_bh(&li->lock);
      list_add_tail(&inti->list, &li->list);
      atomic_set(&li->active, 1);
      atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
      if (store)
            li->action_bits |= ACTION_STORE_ON_STOP;
      li->action_bits |= ACTION_STOP_ON_STOP;
      if (waitqueue_active(&li->wq))
            wake_up_interruptible(&li->wq);
      spin_unlock_bh(&li->lock);
      rc = 0; /* order accepted */
unlock:
      spin_unlock_bh(&fi->lock);
      VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
      return rc;
}

static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
{
      int rc;

      switch (parameter & 0xff) {
      case 0:
            printk(KERN_WARNING "kvm: request to switch to ESA/390 mode"
                                          " not supported");
            rc = 3; /* not operational */
            break;
      case 1:
      case 2:
            rc = 0; /* order accepted */
            break;
      default:
            rc = -ENOTSUPP;
      }
      return rc;
}

static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
                       unsigned long *reg)
{
      struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
      struct kvm_s390_local_interrupt *li;
      struct kvm_s390_interrupt_info *inti;
      int rc;
      u8 tmp;

      /* make sure that the new value is valid memory */
      address = address & 0x7fffe000u;
      if ((copy_from_guest(vcpu, &tmp,
            (u64) (address + vcpu->kvm->arch.guest_origin) , 1)) ||
         (copy_from_guest(vcpu, &tmp, (u64) (address +
                  vcpu->kvm->arch.guest_origin + PAGE_SIZE), 1))) {
            *reg |= SIGP_STAT_INVALID_PARAMETER;
            return 1; /* invalid parameter */
      }

      inti = kzalloc(sizeof(*inti), GFP_KERNEL);
      if (!inti)
            return 2; /* busy */

      spin_lock_bh(&fi->lock);
      li = fi->local_int[cpu_addr];

      if ((cpu_addr >= KVM_MAX_VCPUS) || (li == NULL)) {
            rc = 1; /* incorrect state */
            *reg &= SIGP_STAT_INCORRECT_STATE;
            kfree(inti);
            goto out_fi;
      }

      spin_lock_bh(&li->lock);
      /* cpu must be in stopped state */
      if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
            rc = 1; /* incorrect state */
            *reg &= SIGP_STAT_INCORRECT_STATE;
            kfree(inti);
            goto out_li;
      }

      inti->type = KVM_S390_SIGP_SET_PREFIX;
      inti->prefix.address = address;

      list_add_tail(&inti->list, &li->list);
      atomic_set(&li->active, 1);
      if (waitqueue_active(&li->wq))
            wake_up_interruptible(&li->wq);
      rc = 0; /* order accepted */

      VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
out_li:
      spin_unlock_bh(&li->lock);
out_fi:
      spin_unlock_bh(&fi->lock);
      return rc;
}

int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
{
      int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
      int r3 = vcpu->arch.sie_block->ipa & 0x000f;
      int base2 = vcpu->arch.sie_block->ipb >> 28;
      int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
      u32 parameter;
      u16 cpu_addr = vcpu->arch.guest_gprs[r3];
      u8 order_code;
      int rc;

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

      if (r1 % 2)
            parameter = vcpu->arch.guest_gprs[r1];
      else
            parameter = vcpu->arch.guest_gprs[r1 + 1];

      switch (order_code) {
      case SIGP_SENSE:
            vcpu->stat.instruction_sigp_sense++;
            rc = __sigp_sense(vcpu, cpu_addr,
                          &vcpu->arch.guest_gprs[r1]);
            break;
      case SIGP_EMERGENCY:
            vcpu->stat.instruction_sigp_emergency++;
            rc = __sigp_emergency(vcpu, cpu_addr);
            break;
      case SIGP_STOP:
            vcpu->stat.instruction_sigp_stop++;
            rc = __sigp_stop(vcpu, cpu_addr, 0);
            break;
      case SIGP_STOP_STORE_STATUS:
            vcpu->stat.instruction_sigp_stop++;
            rc = __sigp_stop(vcpu, cpu_addr, 1);
            break;
      case SIGP_SET_ARCH:
            vcpu->stat.instruction_sigp_arch++;
            rc = __sigp_set_arch(vcpu, parameter);
            break;
      case SIGP_SET_PREFIX:
            vcpu->stat.instruction_sigp_prefix++;
            rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
                               &vcpu->arch.guest_gprs[r1]);
            break;
      case SIGP_RESTART:
            vcpu->stat.instruction_sigp_restart++;
            /* user space must know about restart */
      default:
            return -ENOTSUPP;
      }

      if (rc < 0)
            return rc;

      vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
      vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;
      return 0;
}

Generated by  Doxygen 1.6.0   Back to index