s390x/kvm: fix small race reboot vs. cmma

[qemu.git] / hw / s390x / s390-virtio.c

/*
 * QEMU S390 virtio target
 *
 * Copyright (c) 2009 Alexander Graf <[email protected]>
 * 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 "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/hw.h"
#include "qapi/qmp/qerror.h"
#include "qemu/error-report.h"
#include "sysemu/block-backend.h"
#include "sysemu/blockdev.h"
#include "sysemu/sysemu.h"
#include "net/net.h"
#include "hw/boards.h"
#include "hw/loader.h"
#include "hw/virtio/virtio.h"
#include "sysemu/kvm.h"
#include "exec/address-spaces.h"
#include "sysemu/qtest.h"

#include "hw/s390x/sclp.h"
#include "hw/s390x/s390_flic.h"
#include "hw/s390x/s390-virtio.h"
#include "hw/s390x/storage-keys.h"
#include "hw/s390x/ipl.h"
#include "cpu.h"

//#define DEBUG_S390

#ifdef DEBUG_S390
#define DPRINTF(fmt, ...) \
    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
    do { } while (0)
#endif

#define MAX_BLK_DEVS                    10

#define S390_TOD_CLOCK_VALUE_MISSING    0x00
#define S390_TOD_CLOCK_VALUE_PRESENT    0x01

static S390CPU **cpu_states;

S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
{
    if (cpu_addr >= max_cpus) {
        return NULL;
    }

    /* Fast lookup via CPU ID */
    return cpu_states[cpu_addr];
}

void s390_init_ipl_dev(const char *kernel_filename,
                       const char *kernel_cmdline,
                       const char *initrd_filename,
                       const char *firmware,
                       bool enforce_bios)
{
    Object *new = object_new(TYPE_S390_IPL);
    DeviceState *dev = DEVICE(new);

    if (kernel_filename) {
        qdev_prop_set_string(dev, "kernel", kernel_filename);
    }
    if (initrd_filename) {
        qdev_prop_set_string(dev, "initrd", initrd_filename);
    }
    qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
    qdev_prop_set_string(dev, "firmware", firmware);
    qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
    object_property_add_child(qdev_get_machine(), TYPE_S390_IPL,
                              new, NULL);
    object_unref(new);
    qdev_init_nofail(dev);
}

void s390_init_cpus(MachineState *machine)
{
    int i;
    gchar *name;

    if (machine->cpu_model == NULL) {
        if (kvm_enabled()) {
            machine->cpu_model = "host";
        } else {
            machine->cpu_model = "qemu";
        }
    }

    cpu_states = g_new0(S390CPU *, max_cpus);

    for (i = 0; i < max_cpus; i++) {
        name = g_strdup_printf("cpu[%i]", i);
        object_property_add_link(OBJECT(machine), name, TYPE_S390_CPU,
                                 (Object **) &cpu_states[i],
                                 object_property_allow_set_link,
                                 OBJ_PROP_LINK_UNREF_ON_RELEASE,
                                 &error_abort);
        g_free(name);
    }

    for (i = 0; i < smp_cpus; i++) {
        s390x_new_cpu(machine->cpu_model, i, &error_fatal);
    }
}


void s390_create_virtio_net(BusState *bus, const char *name)
{
    int i;

    for (i = 0; i < nb_nics; i++) {
        NICInfo *nd = &nd_table[i];
        DeviceState *dev;

        if (!nd->model) {
            nd->model = g_strdup("virtio");
        }

        qemu_check_nic_model(nd, "virtio");

        dev = qdev_create(bus, name);
        qdev_set_nic_properties(dev, nd);
        qdev_init_nofail(dev);
    }
}

void gtod_save(QEMUFile *f, void *opaque)
{
    uint64_t tod_low;
    uint8_t tod_high;
    int r;

    r = s390_get_clock(&tod_high, &tod_low);
    if (r) {
        fprintf(stderr, "WARNING: Unable to get guest clock for migration. "
                        "Error code %d. Guest clock will not be migrated "
                        "which could cause the guest to hang.\n", r);
        qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
        return;
    }

    qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
    qemu_put_byte(f, tod_high);
    qemu_put_be64(f, tod_low);
}

int gtod_load(QEMUFile *f, void *opaque, int version_id)
{
    uint64_t tod_low;
    uint8_t tod_high;
    int r;

    if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
        fprintf(stderr, "WARNING: Guest clock was not migrated. This could "
                        "cause the guest to hang.\n");
        return 0;
    }

    tod_high = qemu_get_byte(f);
    tod_low = qemu_get_be64(f);

    r = s390_set_clock(&tod_high, &tod_low);
    if (r) {
        fprintf(stderr, "WARNING: Unable to set guest clock value. "
                        "s390_get_clock returned error %d. This could cause "
                        "the guest to hang.\n", r);
    }

    return 0;
}

void s390_nmi(NMIState *n, int cpu_index, Error **errp)
{
    CPUState *cs = qemu_get_cpu(cpu_index);

    if (s390_cpu_restart(S390_CPU(cs))) {
        error_setg(errp, QERR_UNSUPPORTED);
    }
}

void s390_machine_reset(void)
{
    S390CPU *ipl_cpu = S390_CPU(qemu_get_cpu(0));

    s390_cmma_reset();
    qemu_devices_reset();
    s390_crypto_reset();

    /* all cpus are stopped - configure and start the ipl cpu only */
    s390_ipl_prepare_cpu(ipl_cpu);
    s390_cpu_set_state(CPU_STATE_OPERATING, ipl_cpu);
}