hw/s390x/s390-virtio-ccw.c

   1 /*
   2  * virtio ccw machine
   3  *
   4  * Copyright 2012 IBM Corp.
   5  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   8  * your option) any later version. See the COPYING file in the top-level
   9  * directory.
  10  */
  11
  12 #include "hw/boards.h"
  13 #include "exec/address-spaces.h"
  14 #include "s390-virtio.h"
  15 #include "hw/s390x/sclp.h"
  16 #include "hw/s390x/s390_flic.h"
  17 #include "ioinst.h"
  18 #include "css.h"
  19 #include "virtio-ccw.h"
  20 #include "qemu/config-file.h"
  21
  22 #define TYPE_S390_CCW_MACHINE               "s390-ccw-machine"
  23
  24 void io_subsystem_reset(void)
  25 {
  26     DeviceState *css, *sclp, *flic;
  27
  28     css = DEVICE(object_resolve_path_type("", "virtual-css-bridge", NULL));
  29     if (css) {
  30         qdev_reset_all(css);
  31     }
  32     sclp = DEVICE(object_resolve_path_type("",
  33                   "s390-sclp-event-facility", NULL));
  34     if (sclp) {
  35         qdev_reset_all(sclp);
  36     }
  37     flic = DEVICE(object_resolve_path_type("", "s390-flic", NULL));
  38     if (flic) {
  39         qdev_reset_all(flic);
  40     }
  41 }
  42
  43 static int virtio_ccw_hcall_notify(const uint64_t *args)
  44 {
  45     uint64_t subch_id = args[0];
  46     uint64_t queue = args[1];
  47     SubchDev *sch;
  48     int cssid, ssid, schid, m;
  49
  50     if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) {
  51         return -EINVAL;
  52     }
  53     sch = css_find_subch(m, cssid, ssid, schid);
  54     if (!sch || !css_subch_visible(sch)) {
  55         return -EINVAL;
  56     }
  57     if (queue >= VIRTIO_PCI_QUEUE_MAX) {
  58         return -EINVAL;
  59     }
  60     virtio_queue_notify(virtio_ccw_get_vdev(sch), queue);
  61     return 0;
  62
  63 }
  64
  65 static int virtio_ccw_hcall_early_printk(const uint64_t *args)
  66 {
  67     uint64_t mem = args[0];
  68
  69     if (mem < ram_size) {
  70         /* Early printk */
  71         return 0;
  72     }
  73     return -EINVAL;
  74 }
  75
  76 static void virtio_ccw_register_hcalls(void)
  77 {
  78     s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY,
  79                                    virtio_ccw_hcall_notify);
  80     /* Tolerate early printk. */
  81     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
  82                                    virtio_ccw_hcall_early_printk);
  83 }
  84
  85 static void ccw_init(MachineState *machine)
  86 {
  87     ram_addr_t my_ram_size = machine->ram_size;
  88     MemoryRegion *sysmem = get_system_memory();
  89     MemoryRegion *ram = g_new(MemoryRegion, 1);
  90     sclpMemoryHotplugDev *mhd = init_sclp_memory_hotplug_dev();
  91     uint8_t *storage_keys;
  92     int ret;
  93     VirtualCssBus *css_bus;
  94     QemuOpts *opts = qemu_opts_find(qemu_find_opts("memory"), NULL);
  95     ram_addr_t pad_size = 0;
  96     ram_addr_t maxmem = qemu_opt_get_size(opts, "maxmem", my_ram_size);
  97     ram_addr_t standby_mem_size = maxmem - my_ram_size;
  98
  99     /* The storage increment size is a multiple of 1M and is a power of 2.
 100      * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
 101      * The variable 'mhd->increment_size' is an exponent of 2 that can be
 102      * used to calculate the size (in bytes) of an increment. */
 103     mhd->increment_size = 20;
 104     while ((my_ram_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) {
 105         mhd->increment_size++;
 106     }
 107     while ((standby_mem_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) {
 108         mhd->increment_size++;
 109     }
 110
 111     /* The core and standby memory areas need to be aligned with
 112      * the increment size.  In effect, this can cause the
 113      * user-specified memory size to be rounded down to align
 114      * with the nearest increment boundary. */
 115     standby_mem_size = standby_mem_size >> mhd->increment_size
 116                                         << mhd->increment_size;
 117     my_ram_size = my_ram_size >> mhd->increment_size
 118                               << mhd->increment_size;
 119
 120     /* let's propagate the changed ram size into the global variable. */
 121     ram_size = my_ram_size;
 122
 123     /* get a BUS */
 124     css_bus = virtual_css_bus_init();
 125     s390_sclp_init();
 126     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
 127                       machine->initrd_filename, "s390-ccw.img");
 128     s390_flic_init();
 129
 130     /* register hypercalls */
 131     virtio_ccw_register_hcalls();
 132
 133     /* allocate RAM for core */
 134     memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort);
 135     vmstate_register_ram_global(ram);
 136     memory_region_add_subregion(sysmem, 0, ram);
 137
 138     /* If the size of ram is not on a MEM_SECTION_SIZE boundary,
 139        calculate the pad size necessary to force this boundary. */
 140     if (standby_mem_size) {
 141         if (my_ram_size % MEM_SECTION_SIZE) {
 142             pad_size = MEM_SECTION_SIZE - my_ram_size % MEM_SECTION_SIZE;
 143         }
 144         my_ram_size += standby_mem_size + pad_size;
 145         mhd->pad_size = pad_size;
 146         mhd->standby_mem_size = standby_mem_size;
 147     }
 148
 149     /* allocate storage keys */
 150     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 151
 152     /* init CPUs */
 153     s390_init_cpus(machine->cpu_model, storage_keys);
 154
 155     if (kvm_enabled()) {
 156         kvm_s390_enable_css_support(s390_cpu_addr2state(0));
 157     }
 158     /*
 159      * Create virtual css and set it as default so that non mcss-e
 160      * enabled guests only see virtio devices.
 161      */
 162     ret = css_create_css_image(VIRTUAL_CSSID, true);
 163     assert(ret == 0);
 164
 165     /* Create VirtIO network adapters */
 166     s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw");
 167 }
 168
 169 static void ccw_machine_class_init(ObjectClass *oc, void *data)
 170 {
 171     MachineClass *mc = MACHINE_CLASS(oc);
 172     NMIClass *nc = NMI_CLASS(oc);
 173
 174     mc->name = "s390-ccw-virtio";
 175     mc->alias = "s390-ccw";
 176     mc->desc = "VirtIO-ccw based S390 machine";
 177     mc->init = ccw_init;
 178     mc->block_default_type = IF_VIRTIO;
 179     mc->no_cdrom = 1;
 180     mc->no_floppy = 1;
 181     mc->no_serial = 1;
 182     mc->no_parallel = 1;
 183     mc->no_sdcard = 1;
 184     mc->use_sclp = 1,
 185     mc->max_cpus = 255;
 186     nc->nmi_monitor_handler = s390_nmi;
 187 }
 188
 189 static const TypeInfo ccw_machine_info = {
 190     .name          = TYPE_S390_CCW_MACHINE,
 191     .parent        = TYPE_MACHINE,
 192     .class_init    = ccw_machine_class_init,
 193     .interfaces = (InterfaceInfo[]) {
 194         { TYPE_NMI },
 195         { }
 196     },
 197 };
 198
 199 static void ccw_machine_register_types(void)
 200 {
 201     type_register_static(&ccw_machine_info);
 202 }
 203
 204 type_init(ccw_machine_register_types)