Archipelago » qemu

/*

 * QEMU S390x KVM implementation

 *

 * Copyright (c) 2009 Alexander Graf <agraf@suse.de>

 * Copyright IBM Corp. 2012

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * Contributions after 2012-10-29 are licensed under the terms of the

 * GNU GPL, version 2 or (at your option) any later version.

 *

 * You should have received a copy of the GNU (Lesser) General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include <sys/types.h>

#include <sys/ioctl.h>

#include <sys/mman.h>

#include <linux/kvm.h>

#include <asm/ptrace.h>

#include "qemu-common.h"

#include "qemu/timer.h"

#include "sysemu/sysemu.h"

#include "sysemu/kvm.h"

#include "cpu.h"

#include "sysemu/device_tree.h"

/* #define DEBUG_KVM */

#ifdef DEBUG_KVM

#define dprintf(fmt, ...) \

    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)

#else

#define dprintf(fmt, ...) \

    do { } while (0)

#endif

#define IPA0_DIAG                       0x8300

#define IPA0_SIGP                       0xae00

#define IPA0_B2                         0xb200

#define IPA0_B9                         0xb900

#define IPA0_EB                         0xeb00

#define PRIV_SCLP_CALL                  0x20

#define PRIV_CSCH                       0x30

#define PRIV_HSCH                       0x31

#define PRIV_MSCH                       0x32

#define PRIV_SSCH                       0x33

#define PRIV_STSCH                      0x34

#define PRIV_TSCH                       0x35

#define PRIV_TPI                        0x36

#define PRIV_SAL                        0x37

#define PRIV_RSCH                       0x38

#define PRIV_STCRW                      0x39

#define PRIV_STCPS                      0x3a

#define PRIV_RCHP                       0x3b

#define PRIV_SCHM                       0x3c

#define PRIV_CHSC                       0x5f

#define PRIV_SIGA                       0x74

#define PRIV_XSCH                       0x76

#define PRIV_SQBS                       0x8a

#define PRIV_EQBS                       0x9c

#define DIAG_KVM_HYPERCALL              0x500

#define DIAG_KVM_BREAKPOINT             0x501

#define ICPT_INSTRUCTION                0x04

#define ICPT_WAITPSW                    0x1c

#define ICPT_SOFT_INTERCEPT             0x24

#define ICPT_CPU_STOP                   0x28

#define ICPT_IO                         0x40

#define SIGP_RESTART                    0x06

#define SIGP_INITIAL_CPU_RESET          0x0b

#define SIGP_STORE_STATUS_ADDR          0x0e

#define SIGP_SET_ARCH                   0x12

const KVMCapabilityInfo kvm_arch_required_capabilities[] = {

    KVM_CAP_LAST_INFO

};

static int cap_sync_regs;

int kvm_arch_init(KVMState *s)

{

    cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);

    return 0;

}

unsigned long kvm_arch_vcpu_id(CPUState *cpu)

{

    return cpu->cpu_index;

}

int kvm_arch_init_vcpu(CPUState *cpu)

{

    /* nothing todo yet */

    return 0;

}

void kvm_arch_reset_vcpu(CPUState *cpu)

{

    /* The initial reset call is needed here to reset in-kernel

     * vcpu data that we can't access directly from QEMU

     * (i.e. with older kernels which don't support sync_regs/ONE_REG).

     * Before this ioctl cpu_synchronize_state() is called in common kvm

     * code (kvm-all) */

    if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {

        perror("Can't reset vcpu\n");

    }

}

int kvm_arch_put_registers(CPUState *cs, int level)

{

    S390CPU *cpu = S390_CPU(cs);

    CPUS390XState *env = &cpu->env;

    struct kvm_sregs sregs;

    struct kvm_regs regs;

    int ret;

    int i;

    /* always save the PSW  and the GPRS*/

    cs->kvm_run->psw_addr = env->psw.addr;

    cs->kvm_run->psw_mask = env->psw.mask;

    if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {

        for (i = 0; i < 16; i++) {

            cs->kvm_run->s.regs.gprs[i] = env->regs[i];

            cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;

        }

    } else {

        for (i = 0; i < 16; i++) {

            regs.gprs[i] = env->regs[i];

        }

        ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);

        if (ret < 0) {

            return ret;

        }

    }

    /* Do we need to save more than that? */

    if (level == KVM_PUT_RUNTIME_STATE) {

        return 0;

    }

    if (cap_sync_regs &&

        cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&

        cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {

        for (i = 0; i < 16; i++) {

            cs->kvm_run->s.regs.acrs[i] = env->aregs[i];

            cs->kvm_run->s.regs.crs[i] = env->cregs[i];

        }

        cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;

        cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;

    } else {

        for (i = 0; i < 16; i++) {

            sregs.acrs[i] = env->aregs[i];

            sregs.crs[i] = env->cregs[i];

        }

        ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);

        if (ret < 0) {

            return ret;

        }

    }

    /* Finally the prefix */

    if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {

        cs->kvm_run->s.regs.prefix = env->psa;

        cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;

    } else {

        /* prefix is only supported via sync regs */

    }

    return 0;

}

int kvm_arch_get_registers(CPUState *cs)

{

    S390CPU *cpu = S390_CPU(cs);

    CPUS390XState *env = &cpu->env;

    struct kvm_sregs sregs;

    struct kvm_regs regs;

    int ret;

    int i;

    /* get the PSW */

    env->psw.addr = cs->kvm_run->psw_addr;

    env->psw.mask = cs->kvm_run->psw_mask;

    /* the GPRS */

    if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {

        for (i = 0; i < 16; i++) {

            env->regs[i] = cs->kvm_run->s.regs.gprs[i];

        }

    } else {

        ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);

        if (ret < 0) {

            return ret;

        }

         for (i = 0; i < 16; i++) {

            env->regs[i] = regs.gprs[i];

        }

    }

    /* The ACRS and CRS */

    if (cap_sync_regs &&

        cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&

        cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {

        for (i = 0; i < 16; i++) {

            env->aregs[i] = cs->kvm_run->s.regs.acrs[i];

            env->cregs[i] = cs->kvm_run->s.regs.crs[i];

        }

    } else {

        ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);

        if (ret < 0) {

            return ret;

        }

         for (i = 0; i < 16; i++) {

            env->aregs[i] = sregs.acrs[i];

            env->cregs[i] = sregs.crs[i];

        }

    }

    /* Finally the prefix */

    if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {

        env->psa = cs->kvm_run->s.regs.prefix;

    } else {

        /* no prefix without sync regs */

    }

    return 0;

}

/*

 * Legacy layout for s390:

 * Older S390 KVM requires the topmost vma of the RAM to be

 * smaller than an system defined value, which is at least 256GB.

 * Larger systems have larger values. We put the guest between

 * the end of data segment (system break) and this value. We

 * use 32GB as a base to have enough room for the system break

 * to grow. We also have to use MAP parameters that avoid

 * read-only mapping of guest pages.

 */

static void *legacy_s390_alloc(ram_addr_t size)

{

    void *mem;

    mem = mmap((void *) 0x800000000ULL, size,

               PROT_EXEC|PROT_READ|PROT_WRITE,

               MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);

    if (mem == MAP_FAILED) {

        fprintf(stderr, "Allocating RAM failed\n");

        abort();

    }

    return mem;

}

void *kvm_arch_vmalloc(ram_addr_t size)

{

    /* Can we use the standard allocation ? */

    if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&

        kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {

        return NULL;

    } else {

        return legacy_s390_alloc(size);

    }

}

int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)

{

    S390CPU *cpu = S390_CPU(cs);

    CPUS390XState *env = &cpu->env;

    static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};

    if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||

        cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {

        return -EINVAL;

    }

    return 0;

}

int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)

{

    S390CPU *cpu = S390_CPU(cs);

    CPUS390XState *env = &cpu->env;

    uint8_t t[4];

    static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};

    if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {

        return -EINVAL;

    } else if (memcmp(t, diag_501, 4)) {

        return -EINVAL;

    } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {

        return -EINVAL;

    }

    return 0;

}

void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)

{

}

void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)

{

}

int kvm_arch_process_async_events(CPUState *cs)

{

    S390CPU *cpu = S390_CPU(cs);

    return cpu->env.halted;

}

void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,

                                 uint64_t parm64, int vm)

{

    CPUState *cs = CPU(cpu);

    struct kvm_s390_interrupt kvmint;

    int r;

    if (!cs->kvm_state) {

        return;

    }

    kvmint.type = type;

    kvmint.parm = parm;

    kvmint.parm64 = parm64;

    if (vm) {

        r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);

    } else {

        r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);

    }

    if (r < 0) {

        fprintf(stderr, "KVM failed to inject interrupt\n");

        exit(1);

    }

}

void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)

{

    kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,

                                token, 1);

}

void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)

{

    kvm_s390_interrupt_internal(cpu, type, code, 0, 0);

}

static void enter_pgmcheck(S390CPU *cpu, uint16_t code)

{

    kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);

}

static inline void setcc(S390CPU *cpu, uint64_t cc)

{

    CPUS390XState *env = &cpu->env;

    CPUState *cs = CPU(cpu);

    cs->kvm_run->psw_mask &= ~(3ull << 44);

    cs->kvm_run->psw_mask |= (cc & 3) << 44;

    env->psw.mask &= ~(3ul << 44);

    env->psw.mask |= (cc & 3) << 44;

}

static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,

                                 uint16_t ipbh0)

{

    CPUS390XState *env = &cpu->env;

    uint32_t sccb;

    uint64_t code;

    int r = 0;

    cpu_synchronize_state(env);

    sccb = env->regs[ipbh0 & 0xf];

    code = env->regs[(ipbh0 & 0xf0) >> 4];

    r = sclp_service_call(sccb, code);

    if (r < 0) {

        enter_pgmcheck(cpu, -r);

    }

    setcc(cpu, r);

    return 0;

}

static int kvm_handle_css_inst(S390CPU *cpu, struct kvm_run *run,

                               uint8_t ipa0, uint8_t ipa1, uint8_t ipb)

{

    int r = 0;

    int no_cc = 0;

    CPUS390XState *env = &cpu->env;

    if (ipa0 != 0xb2) {

        /* Not handled for now. */

        return -1;

    }

    cpu_synchronize_state(env);

    switch (ipa1) {

    case PRIV_XSCH:

        r = ioinst_handle_xsch(env, env->regs[1]);

        break;

    case PRIV_CSCH:

        r = ioinst_handle_csch(env, env->regs[1]);

        break;

    case PRIV_HSCH:

        r = ioinst_handle_hsch(env, env->regs[1]);

        break;

    case PRIV_MSCH:

        r = ioinst_handle_msch(env, env->regs[1], run->s390_sieic.ipb);

        break;

    case PRIV_SSCH:

        r = ioinst_handle_ssch(env, env->regs[1], run->s390_sieic.ipb);

        break;

    case PRIV_STCRW:

        r = ioinst_handle_stcrw(env, run->s390_sieic.ipb);

        break;

    case PRIV_STSCH:

        r = ioinst_handle_stsch(env, env->regs[1], run->s390_sieic.ipb);

        break;

    case PRIV_TSCH:

        /* We should only get tsch via KVM_EXIT_S390_TSCH. */

        fprintf(stderr, "Spurious tsch intercept\n");

        break;

    case PRIV_CHSC:

        r = ioinst_handle_chsc(env, run->s390_sieic.ipb);

        break;

    case PRIV_TPI:

        /* This should have been handled by kvm already. */

        fprintf(stderr, "Spurious tpi intercept\n");

        break;

    case PRIV_SCHM:

        no_cc = 1;

        r = ioinst_handle_schm(env, env->regs[1], env->regs[2],

                               run->s390_sieic.ipb);

        break;

    case PRIV_RSCH:

        r = ioinst_handle_rsch(env, env->regs[1]);

        break;

    case PRIV_RCHP:

        r = ioinst_handle_rchp(env, env->regs[1]);

        break;

    case PRIV_STCPS:

        /* We do not provide this instruction, it is suppressed. */

        no_cc = 1;

        r = 0;

        break;

    case PRIV_SAL:

        no_cc = 1;

        r = ioinst_handle_sal(env, env->regs[1]);

        break;

    default:

        r = -1;

        break;

    }

    if (r >= 0) {

        if (!no_cc) {

            setcc(cpu, r);

        }

        r = 0;

    } else if (r < -1) {

        r = 0;

    }

    return r;

}

static int is_ioinst(uint8_t ipa0, uint8_t ipa1, uint8_t ipb)

{

    int ret = 0;

    uint16_t ipa = (ipa0 << 8) | ipa1;

    switch (ipa) {

    case IPA0_B2 | PRIV_CSCH:

    case IPA0_B2 | PRIV_HSCH:

    case IPA0_B2 | PRIV_MSCH:

    case IPA0_B2 | PRIV_SSCH:

    case IPA0_B2 | PRIV_STSCH:

    case IPA0_B2 | PRIV_TPI:

    case IPA0_B2 | PRIV_SAL:

    case IPA0_B2 | PRIV_RSCH:

    case IPA0_B2 | PRIV_STCRW:

    case IPA0_B2 | PRIV_STCPS:

    case IPA0_B2 | PRIV_RCHP:

    case IPA0_B2 | PRIV_SCHM:

    case IPA0_B2 | PRIV_CHSC:

    case IPA0_B2 | PRIV_SIGA:

    case IPA0_B2 | PRIV_XSCH:

    case IPA0_B9 | PRIV_EQBS:

    case IPA0_EB | PRIV_SQBS:

        ret = 1;

        break;

    }

    return ret;

}

static int handle_priv(S390CPU *cpu, struct kvm_run *run,

                       uint8_t ipa0, uint8_t ipa1)

{

    int r = 0;

    uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;

    uint8_t ipb = run->s390_sieic.ipb & 0xff;

    dprintf("KVM: PRIV: %d\n", ipa1);

    switch (ipa1) {

        case PRIV_SCLP_CALL:

            r = kvm_sclp_service_call(cpu, run, ipbh0);

            break;

        default:

            if (is_ioinst(ipa0, ipa1, ipb)) {

                r = kvm_handle_css_inst(cpu, run, ipa0, ipa1, ipb);

                if (r == -1) {

                    setcc(cpu, 3);

                    r = 0;

                }

            } else {

                dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);

                r = -1;

            }

            break;

    }

    return r;

}

static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)

{

    cpu_synchronize_state(env);

    env->regs[2] = s390_virtio_hypercall(env);

    return 0;

}

static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)

{

    int r = 0;

    switch (ipb_code) {

        case DIAG_KVM_HYPERCALL:

            r = handle_hypercall(env, run);

            break;

        case DIAG_KVM_BREAKPOINT:

            sleep(10);

            break;

        default:

            dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);

            r = -1;

            break;

    }

    return r;

}

static int s390_cpu_restart(S390CPU *cpu)

{

    kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);

    s390_add_running_cpu(cpu);

    qemu_cpu_kick(CPU(cpu));

    dprintf("DONE: SIGP cpu restart: %p\n", &cpu->env);

    return 0;

}

static int s390_store_status(CPUS390XState *env, uint32_t parameter)

{

    /* XXX */

    fprintf(stderr, "XXX SIGP store status\n");

    return -1;

}

static int s390_cpu_initial_reset(S390CPU *cpu)

{

    CPUS390XState *env = &cpu->env;

    int i;

    s390_del_running_cpu(cpu);

    if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {

        perror("cannot init reset vcpu");

    }

    /* Manually zero out all registers */

    cpu_synchronize_state(env);

    for (i = 0; i < 16; i++) {

        env->regs[i] = 0;

    }

    dprintf("DONE: SIGP initial reset: %p\n", env);

    return 0;

}

static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)

{

    CPUS390XState *env = &cpu->env;

    uint8_t order_code;

    uint32_t parameter;

    uint16_t cpu_addr;

    uint8_t t;

    int r = -1;

    S390CPU *target_cpu;

    CPUS390XState *target_env;

    cpu_synchronize_state(env);

    /* get order code */

    order_code = run->s390_sieic.ipb >> 28;

    if (order_code > 0) {

        order_code = env->regs[order_code];

    }

    order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;

    /* get parameters */

    t = (ipa1 & 0xf0) >> 4;

    if (!(t % 2)) {

        t++;

    }

    parameter = env->regs[t] & 0x7ffffe00;

    cpu_addr = env->regs[ipa1 & 0x0f];

    target_cpu = s390_cpu_addr2state(cpu_addr);

    if (target_cpu == NULL) {

        goto out;

    }

    target_env = &target_cpu->env;

    switch (order_code) {

        case SIGP_RESTART:

            r = s390_cpu_restart(target_cpu);

            break;

        case SIGP_STORE_STATUS_ADDR:

            r = s390_store_status(target_env, parameter);

            break;

        case SIGP_SET_ARCH:

            /* make the caller panic */

            return -1;

        case SIGP_INITIAL_CPU_RESET:

            r = s390_cpu_initial_reset(target_cpu);

            break;

        default:

            fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);

            break;

    }

out:

    setcc(cpu, r ? 3 : 0);

    return 0;

}

static int handle_instruction(S390CPU *cpu, struct kvm_run *run)

{

    CPUS390XState *env = &cpu->env;

    unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);

    uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;

    int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;

    int r = -1;

    dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);

    switch (ipa0) {

    case IPA0_B2:

    case IPA0_B9:

    case IPA0_EB:

        r = handle_priv(cpu, run, ipa0 >> 8, ipa1);

        break;

    case IPA0_DIAG:

        r = handle_diag(env, run, ipb_code);

        break;

    case IPA0_SIGP:

        r = handle_sigp(cpu, run, ipa1);

        break;

    }

    if (r < 0) {

        enter_pgmcheck(cpu, 0x0001);

    }

    return 0;

}

static bool is_special_wait_psw(CPUState *cs)

{

    /* signal quiesce */

    return cs->kvm_run->psw_addr == 0xfffUL;

}

static int handle_intercept(S390CPU *cpu)

{

    CPUState *cs = CPU(cpu);

    struct kvm_run *run = cs->kvm_run;

    int icpt_code = run->s390_sieic.icptcode;

    int r = 0;

    dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,

            (long)cs->kvm_run->psw_addr);

    switch (icpt_code) {

        case ICPT_INSTRUCTION:

            r = handle_instruction(cpu, run);

            break;

        case ICPT_WAITPSW:

            if (s390_del_running_cpu(cpu) == 0 &&

                is_special_wait_psw(cs)) {

                qemu_system_shutdown_request();

            }

            r = EXCP_HALTED;

            break;

        case ICPT_CPU_STOP:

            if (s390_del_running_cpu(cpu) == 0) {

                qemu_system_shutdown_request();

            }

            r = EXCP_HALTED;

            break;

        case ICPT_SOFT_INTERCEPT:

            fprintf(stderr, "KVM unimplemented icpt SOFT\n");

            exit(1);

            break;

        case ICPT_IO:

            fprintf(stderr, "KVM unimplemented icpt IO\n");

            exit(1);

            break;

        default:

            fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);

            exit(1);

            break;

    }

    return r;

}

static int handle_tsch(S390CPU *cpu)

{

    CPUS390XState *env = &cpu->env;

    CPUState *cs = CPU(cpu);

    struct kvm_run *run = cs->kvm_run;

    int ret;

    cpu_synchronize_state(env);

    ret = ioinst_handle_tsch(env, env->regs[1], run->s390_tsch.ipb);

    if (ret >= 0) {

        /* Success; set condition code. */

        setcc(cpu, ret);

        ret = 0;

    } else if (ret < -1) {

        /*

         * Failure.

         * If an I/O interrupt had been dequeued, we have to reinject it.

         */

        if (run->s390_tsch.dequeued) {

            uint16_t subchannel_id = run->s390_tsch.subchannel_id;

            uint16_t subchannel_nr = run->s390_tsch.subchannel_nr;

            uint32_t io_int_parm = run->s390_tsch.io_int_parm;

            uint32_t io_int_word = run->s390_tsch.io_int_word;

            uint32_t type = ((subchannel_id & 0xff00) << 24) |

                ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);

            kvm_s390_interrupt_internal(cpu, type,

                                        ((uint32_t)subchannel_id << 16)

                                        | subchannel_nr,

                                        ((uint64_t)io_int_parm << 32)

                                        | io_int_word, 1);

        }

        ret = 0;

    }

    return ret;

}

int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)

{

    S390CPU *cpu = S390_CPU(cs);

    int ret = 0;

    switch (run->exit_reason) {

        case KVM_EXIT_S390_SIEIC:

            ret = handle_intercept(cpu);

            break;

        case KVM_EXIT_S390_RESET:

            qemu_system_reset_request();

            break;

        case KVM_EXIT_S390_TSCH:

            ret = handle_tsch(cpu);

            break;

        default:

            fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);

            break;

    }

    if (ret == 0) {

        ret = EXCP_INTERRUPT;

    }

    return ret;

}

bool kvm_arch_stop_on_emulation_error(CPUState *cpu)

{

    return true;

}

int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)

{

    return 1;

}

int kvm_arch_on_sigbus(int code, void *addr)

{

    return 1;

}

void kvm_s390_io_interrupt(S390CPU *cpu, uint16_t subchannel_id,

                           uint16_t subchannel_nr, uint32_t io_int_parm,

                           uint32_t io_int_word)

{

    uint32_t type;

    type = ((subchannel_id & 0xff00) << 24) |

        ((subchannel_id & 0x00060) << 22) | (subchannel_nr << 16);

    kvm_s390_interrupt_internal(cpu, type,

                                ((uint32_t)subchannel_id << 16) | subchannel_nr,

                                ((uint64_t)io_int_parm << 32) | io_int_word, 1);

}

void kvm_s390_crw_mchk(S390CPU *cpu)

{

    kvm_s390_interrupt_internal(cpu, KVM_S390_MCHK, 1 << 28,

                                0x00400f1d40330000, 1);

}

void kvm_s390_enable_css_support(S390CPU *cpu)

{

    struct kvm_enable_cap cap = {};

    int r;

    /* Activate host kernel channel subsystem support. */

    cap.cap = KVM_CAP_S390_CSS_SUPPORT;

    r = kvm_vcpu_ioctl(CPU(cpu), KVM_ENABLE_CAP, &cap);

    assert(r == 0);

}