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 #define S390_CCW_MACHINE(obj) \
  26     OBJECT_CHECK(S390CcwMachineState, (obj), TYPE_S390_CCW_MACHINE)
  27
  28 typedef struct S390CcwMachineState {
  29     /*< private >*/
  30     MachineState parent_obj;
  31
  32     /*< public >*/
  33     bool aes_key_wrap;
  34     bool dea_key_wrap;
  35 } S390CcwMachineState;
  36
  37 void io_subsystem_reset(void)
  38 {
  39     DeviceState *css, *sclp, *flic;
  40
  41     css = DEVICE(object_resolve_path_type("", "virtual-css-bridge", NULL));
  42     if (css) {
  43         qdev_reset_all(css);
  44     }
  45     sclp = DEVICE(object_resolve_path_type("",
  46                   "s390-sclp-event-facility", NULL));
  47     if (sclp) {
  48         qdev_reset_all(sclp);
  49     }
  50     flic = DEVICE(object_resolve_path_type("", "s390-flic", NULL));
  51     if (flic) {
  52         qdev_reset_all(flic);
  53     }
  54 }
  55
  56 static int virtio_ccw_hcall_notify(const uint64_t *args)
  57 {
  58     uint64_t subch_id = args[0];
  59     uint64_t queue = args[1];
  60     SubchDev *sch;
  61     int cssid, ssid, schid, m;
  62
  63     if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) {
  64         return -EINVAL;
  65     }
  66     sch = css_find_subch(m, cssid, ssid, schid);
  67     if (!sch || !css_subch_visible(sch)) {
  68         return -EINVAL;
  69     }
  70     if (queue >= VIRTIO_PCI_QUEUE_MAX) {
  71         return -EINVAL;
  72     }
  73     virtio_queue_notify(virtio_ccw_get_vdev(sch), queue);
  74     return 0;
  75
  76 }
  77
  78 static int virtio_ccw_hcall_early_printk(const uint64_t *args)
  79 {
  80     uint64_t mem = args[0];
  81
  82     if (mem < ram_size) {
  83         /* Early printk */
  84         return 0;
  85     }
  86     return -EINVAL;
  87 }
  88
  89 static void virtio_ccw_register_hcalls(void)
  90 {
  91     s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY,
  92                                    virtio_ccw_hcall_notify);
  93     /* Tolerate early printk. */
  94     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
  95                                    virtio_ccw_hcall_early_printk);
  96 }
  97
  98 static void ccw_init(MachineState *machine)
  99 {
 100     ram_addr_t my_ram_size = machine->ram_size;
 101     MemoryRegion *sysmem = get_system_memory();
 102     MemoryRegion *ram = g_new(MemoryRegion, 1);
 103     sclpMemoryHotplugDev *mhd = init_sclp_memory_hotplug_dev();
 104     uint8_t *storage_keys;
 105     int ret;
 106     VirtualCssBus *css_bus;
 107     DeviceState *dev;
 108     QemuOpts *opts = qemu_opts_find(qemu_find_opts("memory"), NULL);
 109     ram_addr_t pad_size = 0;
 110     ram_addr_t maxmem = qemu_opt_get_size(opts, "maxmem", my_ram_size);
 111     ram_addr_t standby_mem_size = maxmem - my_ram_size;
 112     uint64_t kvm_limit;
 113
 114     /* The storage increment size is a multiple of 1M and is a power of 2.
 115      * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
 116      * The variable 'mhd->increment_size' is an exponent of 2 that can be
 117      * used to calculate the size (in bytes) of an increment. */
 118     mhd->increment_size = 20;
 119     while ((my_ram_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) {
 120         mhd->increment_size++;
 121     }
 122     while ((standby_mem_size >> mhd->increment_size) > MAX_STORAGE_INCREMENTS) {
 123         mhd->increment_size++;
 124     }
 125
 126     /* The core and standby memory areas need to be aligned with
 127      * the increment size.  In effect, this can cause the
 128      * user-specified memory size to be rounded down to align
 129      * with the nearest increment boundary. */
 130     standby_mem_size = standby_mem_size >> mhd->increment_size
 131                                         << mhd->increment_size;
 132     my_ram_size = my_ram_size >> mhd->increment_size
 133                               << mhd->increment_size;
 134
 135     /* let's propagate the changed ram size into the global variable. */
 136     ram_size = my_ram_size;
 137     machine->maxram_size = my_ram_size + standby_mem_size;
 138
 139     ret = s390_set_memory_limit(machine->maxram_size, &kvm_limit);
 140     if (ret == -E2BIG) {
 141         hw_error("qemu: host supports a maximum of %" PRIu64 " GB",
 142                  kvm_limit >> 30);
 143     } else if (ret) {
 144         hw_error("qemu: setting the guest size failed");
 145     }
 146
 147     /* get a BUS */
 148     css_bus = virtual_css_bus_init();
 149     s390_sclp_init();
 150     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
 151                       machine->initrd_filename, "s390-ccw.img", true);
 152     s390_flic_init();
 153
 154     dev = qdev_create(NULL, TYPE_S390_PCI_HOST_BRIDGE);
 155     object_property_add_child(qdev_get_machine(), TYPE_S390_PCI_HOST_BRIDGE,
 156                               OBJECT(dev), NULL);
 157     qdev_init_nofail(dev);
 158
 159     /* register hypercalls */
 160     virtio_ccw_register_hcalls();
 161
 162     /* allocate RAM for core */
 163     memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort);
 164     vmstate_register_ram_global(ram);
 165     memory_region_add_subregion(sysmem, 0, ram);
 166
 167     /* If the size of ram is not on a MEM_SECTION_SIZE boundary,
 168        calculate the pad size necessary to force this boundary. */
 169     if (standby_mem_size) {
 170         if (my_ram_size % MEM_SECTION_SIZE) {
 171             pad_size = MEM_SECTION_SIZE - my_ram_size % MEM_SECTION_SIZE;
 172         }
 173         my_ram_size += standby_mem_size + pad_size;
 174         mhd->pad_size = pad_size;
 175         mhd->standby_mem_size = standby_mem_size;
 176     }
 177
 178     /* allocate storage keys */
 179     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 180
 181     /* init CPUs */
 182     s390_init_cpus(machine->cpu_model, storage_keys);
 183
 184     if (kvm_enabled()) {
 185         kvm_s390_enable_css_support(s390_cpu_addr2state(0));
 186     }
 187     /*
 188      * Create virtual css and set it as default so that non mcss-e
 189      * enabled guests only see virtio devices.
 190      */
 191     ret = css_create_css_image(VIRTUAL_CSSID, true);
 192     assert(ret == 0);
 193
 194     /* Create VirtIO network adapters */
 195     s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw");
 196
 197     /* Register savevm handler for guest TOD clock */
 198     register_savevm(NULL, "todclock", 0, 1,
 199                     gtod_save, gtod_load, kvm_state);
 200 }
 201
 202 static void ccw_machine_class_init(ObjectClass *oc, void *data)
 203 {
 204     MachineClass *mc = MACHINE_CLASS(oc);
 205     NMIClass *nc = NMI_CLASS(oc);
 206
 207     mc->name = "s390-ccw-virtio";
 208     mc->alias = "s390-ccw";
 209     mc->desc = "VirtIO-ccw based S390 machine";
 210     mc->init = ccw_init;
 211     mc->block_default_type = IF_VIRTIO;
 212     mc->no_cdrom = 1;
 213     mc->no_floppy = 1;
 214     mc->no_serial = 1;
 215     mc->no_parallel = 1;
 216     mc->no_sdcard = 1;
 217     mc->use_sclp = 1;
 218     mc->max_cpus = 255;
 219     nc->nmi_monitor_handler = s390_nmi;
 220 }
 221
 222 static inline bool machine_get_aes_key_wrap(Object *obj, Error **errp)
 223 {
 224     S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
 225
 226     return ms->aes_key_wrap;
 227 }
 228
 229 static inline void machine_set_aes_key_wrap(Object *obj, bool value,
 230                                             Error **errp)
 231 {
 232     S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
 233
 234     ms->aes_key_wrap = value;
 235 }
 236
 237 static inline bool machine_get_dea_key_wrap(Object *obj, Error **errp)
 238 {
 239     S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
 240
 241     return ms->dea_key_wrap;
 242 }
 243
 244 static inline void machine_set_dea_key_wrap(Object *obj, bool value,
 245                                             Error **errp)
 246 {
 247     S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
 248
 249     ms->dea_key_wrap = value;
 250 }
 251
 252 static inline void s390_machine_initfn(Object *obj)
 253 {
 254     object_property_add_bool(obj, "aes-key-wrap",
 255                              machine_get_aes_key_wrap,
 256                              machine_set_aes_key_wrap, NULL);
 257     object_property_set_description(obj, "aes-key-wrap",
 258             "enable/disable AES key wrapping using the CPACF wrapping key",
 259             NULL);
 260     object_property_set_bool(obj, true, "aes-key-wrap", NULL);
 261
 262     object_property_add_bool(obj, "dea-key-wrap",
 263                              machine_get_dea_key_wrap,
 264                              machine_set_dea_key_wrap, NULL);
 265     object_property_set_description(obj, "dea-key-wrap",
 266             "enable/disable DEA key wrapping using the CPACF wrapping key",
 267             NULL);
 268     object_property_set_bool(obj, true, "dea-key-wrap", NULL);
 269 }
 270
 271 static const TypeInfo ccw_machine_info = {
 272     .name          = TYPE_S390_CCW_MACHINE,
 273     .parent        = TYPE_MACHINE,
 274     .instance_size = sizeof(S390CcwMachineState),
 275     .instance_init = s390_machine_initfn,
 276     .class_init    = ccw_machine_class_init,
 277     .interfaces = (InterfaceInfo[]) {
 278         { TYPE_NMI },
 279         { }
 280     },
 281 };
 282
 283 static void ccw_machine_register_types(void)
 284 {
 285     type_register_static(&ccw_machine_info);
 286 }
 287
 288 type_init(ccw_machine_register_types)