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 #include "s390-pci-bus.h"
  22
  23 #define TYPE_S390_CCW_MACHINE               "s390-ccw-machine"
  24
  25 void io_subsystem_reset(void)
  26 {
  27     DeviceState *css, *sclp, *flic;
  28
  29     css = DEVICE(object_resolve_path_type("", "virtual-css-bridge", NULL));
  30     if (css) {
  31         qdev_reset_all(css);
  32     }
  33     sclp = DEVICE(object_resolve_path_type("",
  34                   "s390-sclp-event-facility", NULL));
  35     if (sclp) {
  36         qdev_reset_all(sclp);
  37     }
  38     flic = DEVICE(object_resolve_path_type("", "s390-flic", NULL));
  39     if (flic) {
  40         qdev_reset_all(flic);
  41     }
  42 }
  43
  44 static int virtio_ccw_hcall_notify(const uint64_t *args)
  45 {
  46     uint64_t subch_id = args[0];
  47     uint64_t queue = args[1];
  48     SubchDev *sch;
  49     int cssid, ssid, schid, m;
  50
  51     if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) {
  52         return -EINVAL;
  53     }
  54     sch = css_find_subch(m, cssid, ssid, schid);
  55     if (!sch || !css_subch_visible(sch)) {
  56         return -EINVAL;
  57     }
  58     if (queue >= VIRTIO_PCI_QUEUE_MAX) {
  59         return -EINVAL;
  60     }
  61     virtio_queue_notify(virtio_ccw_get_vdev(sch), queue);
  62     return 0;
  63
  64 }
  65
  66 static int virtio_ccw_hcall_early_printk(const uint64_t *args)
  67 {
  68     uint64_t mem = args[0];
  69
  70     if (mem < ram_size) {
  71         /* Early printk */
  72         return 0;
  73     }
  74     return -EINVAL;
  75 }
  76
  77 static void virtio_ccw_register_hcalls(void)
  78 {
  79     s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY,
  80                                    virtio_ccw_hcall_notify);
  81     /* Tolerate early printk. */
  82     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
  83                                    virtio_ccw_hcall_early_printk);
  84 }
  85
  86 static void ccw_init(MachineState *machine)
  87 {
  88     ram_addr_t my_ram_size = machine->ram_size;
  89     MemoryRegion *sysmem = get_system_memory();
  90     MemoryRegion *ram = g_new(MemoryRegion, 1);
  91     sclpMemoryHotplugDev *mhd = init_sclp_memory_hotplug_dev();
  92     uint8_t *storage_keys;
  93     int ret;
  94     VirtualCssBus *css_bus;
  95     DeviceState *dev;
  96     QemuOpts *opts = qemu_opts_find(qemu_find_opts("memory"), NULL);
  97     ram_addr_t pad_size = 0;
  98     ram_addr_t maxmem = qemu_opt_get_size(opts, "maxmem", my_ram_size);
  99     ram_addr_t standby_mem_size = maxmem - my_ram_size;
 100     uint64_t kvm_limit;
 101
 102     /* The storage increment size is a multiple of 1M and is a power of 2.
 103      * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
 104      * The variable 'mhd->increment_size' is an exponent of 2 that can be
 105      * used to calculate the size (in bytes) of an increment. */
 106     mhd->increment_size = 20;
 107     while ((my_ram_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) {
 108         mhd->increment_size++;
 109     }
 110     while ((standby_mem_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) {
 111         mhd->increment_size++;
 112     }
 113
 114     /* The core and standby memory areas need to be aligned with
 115      * the increment size.  In effect, this can cause the
 116      * user-specified memory size to be rounded down to align
 117      * with the nearest increment boundary. */
 118     standby_mem_size = standby_mem_size >> mhd->increment_size
 119                                         << mhd->increment_size;
 120     my_ram_size = my_ram_size >> mhd->increment_size
 121                               << mhd->increment_size;
 122
 123     /* let's propagate the changed ram size into the global variable. */
 124     ram_size = my_ram_size;
 125     machine->maxram_size = my_ram_size + standby_mem_size;
 126
 127     ret = s390_set_memory_limit(machine->maxram_size, &kvm_limit);
 128     if (ret == -E2BIG) {
 129         hw_error("qemu: host supports a maximum of %" PRIu64 " GB",
 130                  kvm_limit >> 30);
 131     } else if (ret) {
 132         hw_error("qemu: setting the guest size failed");
 133     }
 134
 135     /* get a BUS */
 136     css_bus = virtual_css_bus_init();
 137     s390_sclp_init();
 138     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
 139                       machine->initrd_filename, "s390-ccw.img", true);
 140     s390_flic_init();
 141
 142     dev = qdev_create(NULL, TYPE_S390_PCI_HOST_BRIDGE);
 143     object_property_add_child(qdev_get_machine(), TYPE_S390_PCI_HOST_BRIDGE,
 144                               OBJECT(dev), NULL);
 145     qdev_init_nofail(dev);
 146
 147     /* register hypercalls */
 148     virtio_ccw_register_hcalls();
 149
 150     /* allocate RAM for core */
 151     memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort);
 152     vmstate_register_ram_global(ram);
 153     memory_region_add_subregion(sysmem, 0, ram);
 154
 155     /* If the size of ram is not on a MEM_SECTION_SIZE boundary,
 156        calculate the pad size necessary to force this boundary. */
 157     if (standby_mem_size) {
 158         if (my_ram_size % MEM_SECTION_SIZE) {
 159             pad_size = MEM_SECTION_SIZE - my_ram_size % MEM_SECTION_SIZE;
 160         }
 161         my_ram_size += standby_mem_size + pad_size;
 162         mhd->pad_size = pad_size;
 163         mhd->standby_mem_size = standby_mem_size;
 164     }
 165
 166     /* allocate storage keys */
 167     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 168
 169     /* init CPUs */
 170     s390_init_cpus(machine->cpu_model, storage_keys);
 171
 172     if (kvm_enabled()) {
 173         kvm_s390_enable_css_support(s390_cpu_addr2state(0));
 174     }
 175     /*
 176      * Create virtual css and set it as default so that non mcss-e
 177      * enabled guests only see virtio devices.
 178      */
 179     ret = css_create_css_image(VIRTUAL_CSSID, true);
 180     assert(ret == 0);
 181
 182     /* Create VirtIO network adapters */
 183     s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw");
 184 }
 185
 186 static void ccw_machine_class_init(ObjectClass *oc, void *data)
 187 {
 188     MachineClass *mc = MACHINE_CLASS(oc);
 189     NMIClass *nc = NMI_CLASS(oc);
 190
 191     mc->name = "s390-ccw-virtio";
 192     mc->alias = "s390-ccw";
 193     mc->desc = "VirtIO-ccw based S390 machine";
 194     mc->init = ccw_init;
 195     mc->block_default_type = IF_VIRTIO;
 196     mc->no_cdrom = 1;
 197     mc->no_floppy = 1;
 198     mc->no_serial = 1;
 199     mc->no_parallel = 1;
 200     mc->no_sdcard = 1;
 201     mc->use_sclp = 1;
 202     mc->max_cpus = 255;
 203     nc->nmi_monitor_handler = s390_nmi;
 204 }
 205
 206 static const TypeInfo ccw_machine_info = {
 207     .name          = TYPE_S390_CCW_MACHINE,
 208     .parent        = TYPE_MACHINE,
 209     .class_init    = ccw_machine_class_init,
 210     .interfaces = (InterfaceInfo[]) {
 211         { TYPE_NMI },
 212         { }
 213     },
 214 };
 215
 216 static void ccw_machine_register_types(void)
 217 {
 218     type_register_static(&ccw_machine_info);
 219 }
 220
 221 type_init(ccw_machine_register_types)