Archipelago » qemu

obj-y += s390-virtio-ccw.o

/*

 * virtio ccw machine

 *

 * Copyright 2012 IBM Corp.

 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or (at

 * your option) any later version. See the COPYING file in the top-level

 * directory.

 */

#include "hw/boards.h"

#include "exec/address-spaces.h"

#include "s390-virtio.h"

#include "sclp.h"

#include "ioinst.h"

#include "css.h"

#include "virtio-ccw.h"

static int virtio_ccw_hcall_notify(const uint64_t *args)

{

    uint64_t subch_id = args[0];

    uint64_t queue = args[1];

    SubchDev *sch;

    int cssid, ssid, schid, m;

    if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) {

        return -EINVAL;

    }

    sch = css_find_subch(m, cssid, ssid, schid);

    if (!sch || !css_subch_visible(sch)) {

        return -EINVAL;

    }

    virtio_queue_notify(virtio_ccw_get_vdev(sch), queue);

    return 0;

}

static int virtio_ccw_hcall_early_printk(const uint64_t *args)

{

    uint64_t mem = args[0];

    if (mem < ram_size) {

        /* Early printk */

        return 0;

    }

    return -EINVAL;

}

static void virtio_ccw_register_hcalls(void)

{

    s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY,

                                   virtio_ccw_hcall_notify);

    /* Tolerate early printk. */

    s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,

                                   virtio_ccw_hcall_early_printk);

}

static void ccw_init(QEMUMachineInitArgs *args)

{

    ram_addr_t my_ram_size = args->ram_size;

    MemoryRegion *sysmem = get_system_memory();

    MemoryRegion *ram = g_new(MemoryRegion, 1);

    int shift = 0;

    uint8_t *storage_keys;

    int ret;

    VirtualCssBus *css_bus;

    /* s390x ram size detection needs a 16bit multiplier + an increment. So

       guests > 64GB can be specified in 2MB steps etc. */

    while ((my_ram_size >> (20 + shift)) > 65535) {

        shift++;

    }

    my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);

    /* lets propagate the changed ram size into the global variable. */

    ram_size = my_ram_size;

    /* get a BUS */

    css_bus = virtual_css_bus_init();

    s390_sclp_init();

    s390_init_ipl_dev(args->kernel_filename, args->kernel_cmdline,

                      args->initrd_filename);

    /* register hypercalls */

    virtio_ccw_register_hcalls();

    /* allocate RAM */

    memory_region_init_ram(ram, "s390.ram", my_ram_size);

    vmstate_register_ram_global(ram);

    memory_region_add_subregion(sysmem, 0, ram);

    /* allocate storage keys */

    storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);

    /* init CPUs */

    s390_init_cpus(args->cpu_model, storage_keys);

    if (kvm_enabled()) {

        kvm_s390_enable_css_support(s390_cpu_addr2state(0));

    }

    /*

     * Create virtual css and set it as default so that non mcss-e

     * enabled guests only see virtio devices.

     */

    ret = css_create_css_image(VIRTUAL_CSSID, true);

    assert(ret == 0);

    /* Create VirtIO network adapters */

    s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw");

}

static QEMUMachine ccw_machine = {

    .name = "s390-ccw-virtio",

    .alias = "s390-ccw",

    .desc = "VirtIO-ccw based S390 machine",

    .init = ccw_init,

    .block_default_type = IF_VIRTIO,

    .no_cdrom = 1,

    .no_floppy = 1,

    .no_serial = 1,

    .no_parallel = 1,

    .no_sdcard = 1,

    .use_sclp = 1,

    .max_cpus = 255,

    DEFAULT_MACHINE_OPTIONS,

};

static void ccw_machine_init(void)

{

    qemu_register_machine(&ccw_machine);

}

machine_init(ccw_machine_init)

#define KVM_S390_VIRTIO_CCW_NOTIFY      3