[qemu.git] / target-s390x / kvm.c

/*
 * 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_PRIV                       0xb200

#define PRIV_SCLP_CALL                  0x20
#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;
}

int kvm_arch_init_vcpu(CPUState *cpu)
{
    int ret = 0;

    if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL) < 0) {
        perror("cannot init reset vcpu");
    }

    return ret;
}

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 handle_priv(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
{
    int r = 0;
    uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;

    dprintf("KVM: PRIV: %d\n", ipa1);
    switch (ipa1) {
        case PRIV_SCLP_CALL:
            r = kvm_sclp_service_call(cpu, run, ipbh0);
            break;
        default:
            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)
{
    CPUS390XState *env = &cpu->env;

    kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
    s390_add_running_cpu(env);
    qemu_cpu_kick(CPU(cpu));
    dprintf("DONE: SIGP cpu restart: %p\n", 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(env);
    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_PRIV:
            r = handle_priv(cpu, run, 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)
{
    CPUS390XState *env = &cpu->env;
    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(env) == 0 &&
                is_special_wait_psw(cs)) {
                qemu_system_shutdown_request();
            }
            r = EXCP_HALTED;
            break;
        case ICPT_CPU_STOP:
            if (s390_del_running_cpu(env) == 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;
}

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;
        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;
}
Commit	Line	Data
0e60a699 AG	1	/*
	2	* QEMU S390x KVM implementation
	3	*
	4	* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
ccb084d3	5	* Copyright IBM Corp. 2012
0e60a699 AG	6	*
	7	* This library is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2 of the License, or (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
ccb084d3 CB	17	* Contributions after 2012-10-29 are licensed under the terms of the
	18	* GNU GPL, version 2 or (at your option) any later version.
	19	*
	20	* You should have received a copy of the GNU (Lesser) General Public
0e60a699 AG	21	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	22	*/
	23
	24	#include <sys/types.h>
	25	#include <sys/ioctl.h>
	26	#include <sys/mman.h>
	27
	28	#include <linux/kvm.h>
	29	#include <asm/ptrace.h>
	30
	31	#include "qemu-common.h"
1de7afc9	32	#include "qemu/timer.h"
9c17d615 PB	33	#include "sysemu/sysemu.h"
9c17d615 PB	34	#include "sysemu/kvm.h"
0e60a699	35	#include "cpu.h"
9c17d615	36	#include "sysemu/device_tree.h"
0e60a699 AG	37
	38	/* #define DEBUG_KVM */
	39
	40	#ifdef DEBUG_KVM
	41	#define dprintf(fmt, ...) \
	42	do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
	43	#else
	44	#define dprintf(fmt, ...) \
	45	do { } while (0)
	46	#endif
	47
	48	#define IPA0_DIAG 0x8300
	49	#define IPA0_SIGP 0xae00
	50	#define IPA0_PRIV 0xb200
	51
	52	#define PRIV_SCLP_CALL 0x20
	53	#define DIAG_KVM_HYPERCALL 0x500
	54	#define DIAG_KVM_BREAKPOINT 0x501
	55
0e60a699 AG	56	#define ICPT_INSTRUCTION 0x04
	57	#define ICPT_WAITPSW 0x1c
	58	#define ICPT_SOFT_INTERCEPT 0x24
	59	#define ICPT_CPU_STOP 0x28
	60	#define ICPT_IO 0x40
	61
	62	#define SIGP_RESTART 0x06
	63	#define SIGP_INITIAL_CPU_RESET 0x0b
	64	#define SIGP_STORE_STATUS_ADDR 0x0e
	65	#define SIGP_SET_ARCH 0x12
	66
94a8d39a JK	67	const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
	68	KVM_CAP_LAST_INFO
	69	};
	70
5b08b344 CB	71	static int cap_sync_regs;
5b08b344 CB	72
cad1e282	73	int kvm_arch_init(KVMState *s)
0e60a699	74	{
5b08b344	75	cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
0e60a699 AG	76	return 0;
	77	}
	78
20d695a9	79	int kvm_arch_init_vcpu(CPUState *cpu)
0e60a699 AG	80	{
	81	int ret = 0;
	82
1bc22652	83	if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL) < 0) {
0e60a699 AG	84	perror("cannot init reset vcpu");
	85	}
	86
	87	return ret;
	88	}
	89
20d695a9	90	void kvm_arch_reset_vcpu(CPUState *cpu)
0e60a699	91	{
419831d7 AG	92	/* The initial reset call is needed here to reset in-kernel
	93	* vcpu data that we can't access directly from QEMU
	94	* (i.e. with older kernels which don't support sync_regs/ONE_REG).
	95	* Before this ioctl cpu_synchronize_state() is called in common kvm
	96	* code (kvm-all) */
70bada03 JF	97	if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL)) {
	98	perror("Can't reset vcpu\n");
	99	}
0e60a699 AG	100	}
0e60a699 AG	101
20d695a9	102	int kvm_arch_put_registers(CPUState *cs, int level)
0e60a699	103	{
20d695a9 AF	104	S390CPU *cpu = S390_CPU(cs);
20d695a9 AF	105	CPUS390XState *env = &cpu->env;
5b08b344	106	struct kvm_sregs sregs;
0e60a699 AG	107	struct kvm_regs regs;
	108	int ret;
	109	int i;
	110
5b08b344	111	/* always save the PSW and the GPRS*/
f7575c96 AF	112	cs->kvm_run->psw_addr = env->psw.addr;
f7575c96 AF	113	cs->kvm_run->psw_mask = env->psw.mask;
0e60a699	114
f7575c96	115	if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
5b08b344	116	for (i = 0; i < 16; i++) {
f7575c96 AF	117	cs->kvm_run->s.regs.gprs[i] = env->regs[i];
f7575c96 AF	118	cs->kvm_run->kvm_dirty_regs \|= KVM_SYNC_GPRS;
5b08b344 CB	119	}
	120	} else {
	121	for (i = 0; i < 16; i++) {
	122	regs.gprs[i] = env->regs[i];
	123	}
1bc22652	124	ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, &regs);
5b08b344 CB	125	if (ret < 0) {
	126	return ret;
	127	}
0e60a699 AG	128	}
0e60a699 AG	129
5b08b344 CB	130	/* Do we need to save more than that? */
	131	if (level == KVM_PUT_RUNTIME_STATE) {
	132	return 0;
0e60a699 AG	133	}
0e60a699 AG	134
5b08b344	135	if (cap_sync_regs &&
f7575c96 AF	136	cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
f7575c96 AF	137	cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
5b08b344	138	for (i = 0; i < 16; i++) {
f7575c96 AF	139	cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
f7575c96 AF	140	cs->kvm_run->s.regs.crs[i] = env->cregs[i];
5b08b344	141	}
f7575c96 AF	142	cs->kvm_run->kvm_dirty_regs \|= KVM_SYNC_ACRS;
f7575c96 AF	143	cs->kvm_run->kvm_dirty_regs \|= KVM_SYNC_CRS;
5b08b344 CB	144	} else {
	145	for (i = 0; i < 16; i++) {
	146	sregs.acrs[i] = env->aregs[i];
	147	sregs.crs[i] = env->cregs[i];
	148	}
1bc22652	149	ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
5b08b344 CB	150	if (ret < 0) {
	151	return ret;
	152	}
	153	}
0e60a699	154
5b08b344	155	/* Finally the prefix */
f7575c96 AF	156	if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
	157	cs->kvm_run->s.regs.prefix = env->psa;
	158	cs->kvm_run->kvm_dirty_regs \|= KVM_SYNC_PREFIX;
5b08b344 CB	159	} else {
	160	/* prefix is only supported via sync regs */
	161	}
	162	return 0;
0e60a699 AG	163	}
0e60a699 AG	164
20d695a9	165	int kvm_arch_get_registers(CPUState *cs)
0e60a699	166	{
20d695a9 AF	167	S390CPU *cpu = S390_CPU(cs);
20d695a9 AF	168	CPUS390XState *env = &cpu->env;
5b08b344	169	struct kvm_sregs sregs;
0e60a699	170	struct kvm_regs regs;
5b08b344	171	int ret;
0e60a699 AG	172	int i;
0e60a699 AG	173
5b08b344	174	/* get the PSW */
f7575c96 AF	175	env->psw.addr = cs->kvm_run->psw_addr;
f7575c96 AF	176	env->psw.mask = cs->kvm_run->psw_mask;
5b08b344 CB	177
5b08b344 CB	178	/* the GPRS */
f7575c96	179	if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
5b08b344	180	for (i = 0; i < 16; i++) {
f7575c96	181	env->regs[i] = cs->kvm_run->s.regs.gprs[i];
5b08b344 CB	182	}
5b08b344 CB	183	} else {
1bc22652	184	ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, &regs);
5b08b344 CB	185	if (ret < 0) {
	186	return ret;
	187	}
	188	for (i = 0; i < 16; i++) {
	189	env->regs[i] = regs.gprs[i];
	190	}
0e60a699 AG	191	}
0e60a699 AG	192
5b08b344 CB	193	/* The ACRS and CRS */
5b08b344 CB	194	if (cap_sync_regs &&
f7575c96 AF	195	cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
f7575c96 AF	196	cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
5b08b344	197	for (i = 0; i < 16; i++) {
f7575c96 AF	198	env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
f7575c96 AF	199	env->cregs[i] = cs->kvm_run->s.regs.crs[i];
5b08b344 CB	200	}
5b08b344 CB	201	} else {
1bc22652	202	ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
5b08b344 CB	203	if (ret < 0) {
	204	return ret;
	205	}
	206	for (i = 0; i < 16; i++) {
	207	env->aregs[i] = sregs.acrs[i];
	208	env->cregs[i] = sregs.crs[i];
	209	}
0e60a699 AG	210	}
0e60a699 AG	211
5b08b344	212	/* Finally the prefix */
f7575c96 AF	213	if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
f7575c96 AF	214	env->psa = cs->kvm_run->s.regs.prefix;
5b08b344 CB	215	} else {
	216	/* no prefix without sync regs */
	217	}
0e60a699 AG	218
	219	return 0;
	220	}
	221
fdec9918 CB	222	/*
	223	* Legacy layout for s390:
	224	* Older S390 KVM requires the topmost vma of the RAM to be
	225	* smaller than an system defined value, which is at least 256GB.
	226	* Larger systems have larger values. We put the guest between
	227	* the end of data segment (system break) and this value. We
	228	* use 32GB as a base to have enough room for the system break
	229	* to grow. We also have to use MAP parameters that avoid
	230	* read-only mapping of guest pages.
	231	*/
	232	static void *legacy_s390_alloc(ram_addr_t size)
	233	{
	234	void *mem;
	235
	236	mem = mmap((void *) 0x800000000ULL, size,
	237	PROT_EXEC\|PROT_READ\|PROT_WRITE,
	238	MAP_SHARED \| MAP_ANONYMOUS \| MAP_FIXED, -1, 0);
	239	if (mem == MAP_FAILED) {
	240	fprintf(stderr, "Allocating RAM failed\n");
	241	abort();
	242	}
	243	return mem;
	244	}
	245
	246	void *kvm_arch_vmalloc(ram_addr_t size)
	247	{
	248	/* Can we use the standard allocation ? */
	249	if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
	250	kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
	251	return NULL;
	252	} else {
	253	return legacy_s390_alloc(size);
	254	}
	255	}
	256
20d695a9	257	int kvm_arch_insert_sw_breakpoint(CPUState cs, struct kvm_sw_breakpoint bp)
0e60a699	258	{
20d695a9 AF	259	S390CPU *cpu = S390_CPU(cs);
20d695a9 AF	260	CPUS390XState *env = &cpu->env;
0e60a699 AG	261	static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
	262
	263	if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) \|\|
	264	cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
	265	return -EINVAL;
	266	}
	267	return 0;
	268	}
	269
20d695a9	270	int kvm_arch_remove_sw_breakpoint(CPUState cs, struct kvm_sw_breakpoint bp)
0e60a699	271	{
20d695a9 AF	272	S390CPU *cpu = S390_CPU(cs);
20d695a9 AF	273	CPUS390XState *env = &cpu->env;
0e60a699 AG	274	uint8_t t[4];
	275	static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
	276
	277	if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
	278	return -EINVAL;
	279	} else if (memcmp(t, diag_501, 4)) {
	280	return -EINVAL;
	281	} else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
	282	return -EINVAL;
	283	}
	284
	285	return 0;
	286	}
	287
20d695a9	288	void kvm_arch_pre_run(CPUState cpu, struct kvm_run run)
0e60a699	289	{
0e60a699 AG	290	}
0e60a699 AG	291
20d695a9	292	void kvm_arch_post_run(CPUState cpu, struct kvm_run run)
0e60a699	293	{
0e60a699 AG	294	}
0e60a699 AG	295
20d695a9	296	int kvm_arch_process_async_events(CPUState *cs)
0af691d7	297	{
20d695a9 AF	298	S390CPU *cpu = S390_CPU(cs);
20d695a9 AF	299	return cpu->env.halted;
0af691d7 MT	300	}
0af691d7 MT	301
1bc22652	302	void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
bcec36ea	303	uint64_t parm64, int vm)
0e60a699	304	{
1bc22652	305	CPUState *cs = CPU(cpu);
0e60a699 AG	306	struct kvm_s390_interrupt kvmint;
	307	int r;
	308
a60f24b5	309	if (!cs->kvm_state) {
0e60a699 AG	310	return;
	311	}
	312
0e60a699 AG	313	kvmint.type = type;
	314	kvmint.parm = parm;
	315	kvmint.parm64 = parm64;
	316
	317	if (vm) {
a60f24b5	318	r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
0e60a699	319	} else {
1bc22652	320	r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
0e60a699 AG	321	}
	322
	323	if (r < 0) {
	324	fprintf(stderr, "KVM failed to inject interrupt\n");
	325	exit(1);
	326	}
	327	}
	328
1bc22652	329	void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
0e60a699	330	{
1bc22652	331	kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
0e60a699 AG	332	token, 1);
	333	}
	334
1bc22652	335	void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
0e60a699	336	{
1bc22652	337	kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
0e60a699 AG	338	}
0e60a699 AG	339
1bc22652	340	static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
0e60a699	341	{
1bc22652	342	kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
0e60a699 AG	343	}
0e60a699 AG	344
f7575c96	345	static inline void setcc(S390CPU *cpu, uint64_t cc)
0e60a699	346	{
f7575c96 AF	347	CPUS390XState *env = &cpu->env;
	348	CPUState *cs = CPU(cpu);
	349
	350	cs->kvm_run->psw_mask &= ~(3ull << 44);
	351	cs->kvm_run->psw_mask \|= (cc & 3) << 44;
0e60a699 AG	352
	353	env->psw.mask &= ~(3ul << 44);
	354	env->psw.mask \|= (cc & 3) << 44;
	355	}
	356
1bc22652	357	static int kvm_sclp_service_call(S390CPU cpu, struct kvm_run run,
bcec36ea	358	uint16_t ipbh0)
0e60a699	359	{
1bc22652	360	CPUS390XState *env = &cpu->env;
0e60a699 AG	361	uint32_t sccb;
	362	uint64_t code;
	363	int r = 0;
	364
	365	cpu_synchronize_state(env);
	366	sccb = env->regs[ipbh0 & 0xf];
	367	code = env->regs[(ipbh0 & 0xf0) >> 4];
	368
f6c98f92	369	r = sclp_service_call(sccb, code);
9abf567d	370	if (r < 0) {
1bc22652	371	enter_pgmcheck(cpu, -r);
0e60a699	372	}
f7575c96	373	setcc(cpu, r);
81f7c56c	374
0e60a699 AG	375	return 0;
	376	}
	377
1bc22652	378	static int handle_priv(S390CPU cpu, struct kvm_run run, uint8_t ipa1)
0e60a699 AG	379	{
	380	int r = 0;
	381	uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
	382
	383	dprintf("KVM: PRIV: %d\n", ipa1);
	384	switch (ipa1) {
	385	case PRIV_SCLP_CALL:
1bc22652	386	r = kvm_sclp_service_call(cpu, run, ipbh0);
0e60a699 AG	387	break;
	388	default:
	389	dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
	390	r = -1;
	391	break;
	392	}
	393
	394	return r;
	395	}
	396
a4e3ad19	397	static int handle_hypercall(CPUS390XState env, struct kvm_run run)
0e60a699	398	{
0e60a699	399	cpu_synchronize_state(env);
28e942f8	400	env->regs[2] = s390_virtio_hypercall(env);
0e60a699	401
bcec36ea	402	return 0;
0e60a699 AG	403	}
0e60a699 AG	404
a4e3ad19	405	static int handle_diag(CPUS390XState env, struct kvm_run run, int ipb_code)
0e60a699 AG	406	{
	407	int r = 0;
	408
	409	switch (ipb_code) {
	410	case DIAG_KVM_HYPERCALL:
	411	r = handle_hypercall(env, run);
	412	break;
	413	case DIAG_KVM_BREAKPOINT:
	414	sleep(10);
	415	break;
	416	default:
	417	dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
	418	r = -1;
	419	break;
	420	}
	421
	422	return r;
	423	}
	424
3edb8f92	425	static int s390_cpu_restart(S390CPU *cpu)
0e60a699	426	{
3edb8f92 AF	427	CPUS390XState *env = &cpu->env;
3edb8f92 AF	428
1bc22652	429	kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
854e42f3	430	s390_add_running_cpu(env);
c08d7424	431	qemu_cpu_kick(CPU(cpu));
0e60a699 AG	432	dprintf("DONE: SIGP cpu restart: %p\n", env);
	433	return 0;
	434	}
	435
a4e3ad19	436	static int s390_store_status(CPUS390XState *env, uint32_t parameter)
0e60a699 AG	437	{
	438	/* XXX */
	439	fprintf(stderr, "XXX SIGP store status\n");
	440	return -1;
	441	}
	442
1bc22652	443	static int s390_cpu_initial_reset(S390CPU *cpu)
0e60a699	444	{
1bc22652	445	CPUS390XState *env = &cpu->env;
d5900813 AG	446	int i;
d5900813 AG	447
2fb70f6f	448	s390_del_running_cpu(env);
1bc22652	449	if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
d5900813 AG	450	perror("cannot init reset vcpu");
	451	}
	452
	453	/* Manually zero out all registers */
	454	cpu_synchronize_state(env);
	455	for (i = 0; i < 16; i++) {
	456	env->regs[i] = 0;
	457	}
	458
	459	dprintf("DONE: SIGP initial reset: %p\n", env);
	460	return 0;
0e60a699 AG	461	}
0e60a699 AG	462
f7575c96	463	static int handle_sigp(S390CPU cpu, struct kvm_run run, uint8_t ipa1)
0e60a699	464	{
f7575c96	465	CPUS390XState *env = &cpu->env;
0e60a699 AG	466	uint8_t order_code;
	467	uint32_t parameter;
	468	uint16_t cpu_addr;
	469	uint8_t t;
	470	int r = -1;
45fa769b	471	S390CPU *target_cpu;
a4e3ad19	472	CPUS390XState *target_env;
0e60a699 AG	473
	474	cpu_synchronize_state(env);
	475
	476	/* get order code */
	477	order_code = run->s390_sieic.ipb >> 28;
	478	if (order_code > 0) {
	479	order_code = env->regs[order_code];
	480	}
	481	order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
	482
	483	/* get parameters */
	484	t = (ipa1 & 0xf0) >> 4;
	485	if (!(t % 2)) {
	486	t++;
	487	}
	488
	489	parameter = env->regs[t] & 0x7ffffe00;
	490	cpu_addr = env->regs[ipa1 & 0x0f];
	491
45fa769b AF	492	target_cpu = s390_cpu_addr2state(cpu_addr);
45fa769b AF	493	if (target_cpu == NULL) {
0e60a699 AG	494	goto out;
0e60a699 AG	495	}
45fa769b	496	target_env = &target_cpu->env;
0e60a699 AG	497
	498	switch (order_code) {
	499	case SIGP_RESTART:
3edb8f92	500	r = s390_cpu_restart(target_cpu);
0e60a699 AG	501	break;
	502	case SIGP_STORE_STATUS_ADDR:
	503	r = s390_store_status(target_env, parameter);
	504	break;
	505	case SIGP_SET_ARCH:
	506	/* make the caller panic */
	507	return -1;
	508	case SIGP_INITIAL_CPU_RESET:
1bc22652	509	r = s390_cpu_initial_reset(target_cpu);
0e60a699 AG	510	break;
0e60a699 AG	511	default:
a74cdab4	512	fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
0e60a699 AG	513	break;
	514	}
	515
	516	out:
f7575c96	517	setcc(cpu, r ? 3 : 0);
0e60a699 AG	518	return 0;
	519	}
	520
1bc22652	521	static int handle_instruction(S390CPU cpu, struct kvm_run run)
0e60a699	522	{
1bc22652	523	CPUS390XState *env = &cpu->env;
0e60a699 AG	524	unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
	525	uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
	526	int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
d7963c43	527	int r = -1;
0e60a699 AG	528
	529	dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
	530	switch (ipa0) {
	531	case IPA0_PRIV:
1bc22652	532	r = handle_priv(cpu, run, ipa1);
0e60a699 AG	533	break;
	534	case IPA0_DIAG:
	535	r = handle_diag(env, run, ipb_code);
	536	break;
	537	case IPA0_SIGP:
f7575c96	538	r = handle_sigp(cpu, run, ipa1);
0e60a699 AG	539	break;
	540	}
	541
	542	if (r < 0) {
1bc22652	543	enter_pgmcheck(cpu, 0x0001);
0e60a699	544	}
359507ee	545	return 0;
0e60a699 AG	546	}
0e60a699 AG	547
f7575c96	548	static bool is_special_wait_psw(CPUState *cs)
eca3ed03 CB	549	{
eca3ed03 CB	550	/* signal quiesce */
f7575c96	551	return cs->kvm_run->psw_addr == 0xfffUL;
eca3ed03 CB	552	}
eca3ed03 CB	553
1bc22652	554	static int handle_intercept(S390CPU *cpu)
0e60a699	555	{
1bc22652	556	CPUS390XState *env = &cpu->env;
f7575c96 AF	557	CPUState *cs = CPU(cpu);
f7575c96 AF	558	struct kvm_run *run = cs->kvm_run;
0e60a699 AG	559	int icpt_code = run->s390_sieic.icptcode;
	560	int r = 0;
	561
81f7c56c	562	dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
f7575c96	563	(long)cs->kvm_run->psw_addr);
0e60a699 AG	564	switch (icpt_code) {
0e60a699 AG	565	case ICPT_INSTRUCTION:
1bc22652	566	r = handle_instruction(cpu, run);
0e60a699 AG	567	break;
0e60a699 AG	568	case ICPT_WAITPSW:
eca3ed03	569	if (s390_del_running_cpu(env) == 0 &&
f7575c96	570	is_special_wait_psw(cs)) {
eca3ed03 CB	571	qemu_system_shutdown_request();
	572	}
	573	r = EXCP_HALTED;
	574	break;
854e42f3 CB	575	case ICPT_CPU_STOP:
	576	if (s390_del_running_cpu(env) == 0) {
	577	qemu_system_shutdown_request();
	578	}
	579	r = EXCP_HALTED;
0e60a699 AG	580	break;
	581	case ICPT_SOFT_INTERCEPT:
	582	fprintf(stderr, "KVM unimplemented icpt SOFT\n");
	583	exit(1);
	584	break;
0e60a699 AG	585	case ICPT_IO:
	586	fprintf(stderr, "KVM unimplemented icpt IO\n");
	587	exit(1);
	588	break;
	589	default:
	590	fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
	591	exit(1);
	592	break;
	593	}
	594
	595	return r;
	596	}
	597
20d695a9	598	int kvm_arch_handle_exit(CPUState cs, struct kvm_run run)
0e60a699	599	{
20d695a9	600	S390CPU *cpu = S390_CPU(cs);
0e60a699 AG	601	int ret = 0;
	602
	603	switch (run->exit_reason) {
	604	case KVM_EXIT_S390_SIEIC:
1bc22652	605	ret = handle_intercept(cpu);
0e60a699 AG	606	break;
0e60a699 AG	607	case KVM_EXIT_S390_RESET:
add142e0	608	qemu_system_reset_request();
0e60a699 AG	609	break;
	610	default:
	611	fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
	612	break;
	613	}
	614
bb4ea393 JK	615	if (ret == 0) {
bb4ea393 JK	616	ret = EXCP_INTERRUPT;
bb4ea393	617	}
0e60a699 AG	618	return ret;
0e60a699 AG	619	}
4513d923	620
20d695a9	621	bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
4513d923 GN	622	{
	623	return true;
	624	}
a1b87fe0	625
20d695a9	626	int kvm_arch_on_sigbus_vcpu(CPUState cpu, int code, void addr)
a1b87fe0 JK	627	{
	628	return 1;
	629	}
	630
	631	int kvm_arch_on_sigbus(int code, void *addr)
	632	{
	633	return 1;
	634	}