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priv.c

/*
 * priv.c - handling privileged 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/errno.h>
#include <asm/current.h>
#include <asm/debug.h>
#include <asm/ebcdic.h>
#include <asm/sysinfo.h>
#include "gaccess.h"
#include "kvm-s390.h"

static int handle_set_prefix(struct kvm_vcpu *vcpu)
{
      int base2 = vcpu->arch.sie_block->ipb >> 28;
      int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
      u64 operand2;
      u32 address = 0;
      u8 tmp;

      vcpu->stat.instruction_spx++;

      operand2 = disp2;
      if (base2)
            operand2 += vcpu->arch.guest_gprs[base2];

      /* must be word boundary */
      if (operand2 & 3) {
            kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
            goto out;
      }

      /* get the value */
      if (get_guest_u32(vcpu, operand2, &address)) {
            kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
            goto out;
      }

      address = address & 0x7fffe000u;

      /* make sure that the new value is valid memory */
      if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
         (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1))) {
            kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
            goto out;
      }

      vcpu->arch.sie_block->prefix = address;
      vcpu->arch.sie_block->ihcpu = 0xffff;

      VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
out:
      return 0;
}

static int handle_store_prefix(struct kvm_vcpu *vcpu)
{
      int base2 = vcpu->arch.sie_block->ipb >> 28;
      int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
      u64 operand2;
      u32 address;

      vcpu->stat.instruction_stpx++;
      operand2 = disp2;
      if (base2)
            operand2 += vcpu->arch.guest_gprs[base2];

      /* must be word boundary */
      if (operand2 & 3) {
            kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
            goto out;
      }

      address = vcpu->arch.sie_block->prefix;
      address = address & 0x7fffe000u;

      /* get the value */
      if (put_guest_u32(vcpu, operand2, address)) {
            kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
            goto out;
      }

      VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
out:
      return 0;
}

static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
{
      int base2 = vcpu->arch.sie_block->ipb >> 28;
      int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
      u64 useraddr;
      int rc;

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

      if (useraddr & 1) {
            kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
            goto out;
      }

      rc = put_guest_u16(vcpu, useraddr, vcpu->vcpu_id);
      if (rc == -EFAULT) {
            kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
            goto out;
      }

      VCPU_EVENT(vcpu, 5, "storing cpu address to %lx", useraddr);
out:
      return 0;
}

static int handle_skey(struct kvm_vcpu *vcpu)
{
      vcpu->stat.instruction_storage_key++;
      vcpu->arch.sie_block->gpsw.addr -= 4;
      VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
      return 0;
}

static int handle_stsch(struct kvm_vcpu *vcpu)
{
      vcpu->stat.instruction_stsch++;
      VCPU_EVENT(vcpu, 4, "%s", "store subchannel - CC3");
      /* condition code 3 */
      vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
      vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
      return 0;
}

static int handle_chsc(struct kvm_vcpu *vcpu)
{
      vcpu->stat.instruction_chsc++;
      VCPU_EVENT(vcpu, 4, "%s", "channel subsystem call - CC3");
      /* condition code 3 */
      vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
      vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
      return 0;
}

static int handle_stfl(struct kvm_vcpu *vcpu)
{
      unsigned int facility_list = stfl();
      int rc;

      vcpu->stat.instruction_stfl++;
      facility_list &= ~(1UL<<24); /* no stfle */
      facility_list &= ~(1UL<<23); /* no large pages */

      rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
                     &facility_list, sizeof(facility_list));
      if (rc == -EFAULT)
            kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
      else
            VCPU_EVENT(vcpu, 5, "store facility list value %x",
                     facility_list);
      return 0;
}

static int handle_stidp(struct kvm_vcpu *vcpu)
{
      int base2 = vcpu->arch.sie_block->ipb >> 28;
      int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
      u64 operand2;
      int rc;

      vcpu->stat.instruction_stidp++;
      operand2 = disp2;
      if (base2)
            operand2 += vcpu->arch.guest_gprs[base2];

      if (operand2 & 7) {
            kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
            goto out;
      }

      rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data);
      if (rc == -EFAULT) {
            kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
            goto out;
      }

      VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
out:
      return 0;
}

static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
{
      struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
      int cpus = 0;
      int n;

      spin_lock_bh(&fi->lock);
      for (n = 0; n < KVM_MAX_VCPUS; n++)
            if (fi->local_int[n])
                  cpus++;
      spin_unlock_bh(&fi->lock);

      /* deal with other level 3 hypervisors */
      if (stsi(mem, 3, 2, 2) == -ENOSYS)
            mem->count = 0;
      if (mem->count < 8)
            mem->count++;
      for (n = mem->count - 1; n > 0 ; n--)
            memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));

      mem->vm[0].cpus_total = cpus;
      mem->vm[0].cpus_configured = cpus;
      mem->vm[0].cpus_standby = 0;
      mem->vm[0].cpus_reserved = 0;
      mem->vm[0].caf = 1000;
      memcpy(mem->vm[0].name, "KVMguest", 8);
      ASCEBC(mem->vm[0].name, 8);
      memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
      ASCEBC(mem->vm[0].cpi, 16);
}

static int handle_stsi(struct kvm_vcpu *vcpu)
{
      int fc = (vcpu->arch.guest_gprs[0] & 0xf0000000) >> 28;
      int sel1 = vcpu->arch.guest_gprs[0] & 0xff;
      int sel2 = vcpu->arch.guest_gprs[1] & 0xffff;
      int base2 = vcpu->arch.sie_block->ipb >> 28;
      int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
      u64 operand2;
      unsigned long mem;

      vcpu->stat.instruction_stsi++;
      VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);

      operand2 = disp2;
      if (base2)
            operand2 += vcpu->arch.guest_gprs[base2];

      if (operand2 & 0xfff && fc > 0)
            return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

      switch (fc) {
      case 0:
            vcpu->arch.guest_gprs[0] = 3 << 28;
            vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
            return 0;
      case 1: /* same handling for 1 and 2 */
      case 2:
            mem = get_zeroed_page(GFP_KERNEL);
            if (!mem)
                  goto out_fail;
            if (stsi((void *) mem, fc, sel1, sel2) == -ENOSYS)
                  goto out_mem;
            break;
      case 3:
            if (sel1 != 2 || sel2 != 2)
                  goto out_fail;
            mem = get_zeroed_page(GFP_KERNEL);
            if (!mem)
                  goto out_fail;
            handle_stsi_3_2_2(vcpu, (void *) mem);
            break;
      default:
            goto out_fail;
      }

      if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
            kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
            goto out_mem;
      }
      free_page(mem);
      vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
      vcpu->arch.guest_gprs[0] = 0;
      return 0;
out_mem:
      free_page(mem);
out_fail:
      /* condition code 3 */
      vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
      return 0;
}

static intercept_handler_t priv_handlers[256] = {
      [0x02] = handle_stidp,
      [0x10] = handle_set_prefix,
      [0x11] = handle_store_prefix,
      [0x12] = handle_store_cpu_address,
      [0x29] = handle_skey,
      [0x2a] = handle_skey,
      [0x2b] = handle_skey,
      [0x34] = handle_stsch,
      [0x5f] = handle_chsc,
      [0x7d] = handle_stsi,
      [0xb1] = handle_stfl,
};

int kvm_s390_handle_priv(struct kvm_vcpu *vcpu)
{
      intercept_handler_t handler;

      handler = priv_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
      if (handler)
            return handler(vcpu);
      return -ENOTSUPP;
}

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