hw/s390x/s390-virtio.c

   1 /*
   2  * QEMU S390 virtio target
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  * Copyright IBM Corp 2012
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * Contributions after 2012-10-29 are licensed under the terms of the
  18  * GNU GPL, version 2 or (at your option) any later version.
  19  *
  20  * You should have received a copy of the GNU (Lesser) General Public
  21  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "hw/hw.h"
  25 #include "block/block.h"
  26 #include "sysemu/blockdev.h"
  27 #include "sysemu/sysemu.h"
  28 #include "net/net.h"
  29 #include "hw/boards.h"
  30 #include "monitor/monitor.h"
  31 #include "hw/loader.h"
  32 #include "hw/virtio.h"
  33 #include "hw/sysbus.h"
  34 #include "sysemu/kvm.h"
  35 #include "exec/address-spaces.h"
  36
  37 #include "hw/s390x/s390-virtio-bus.h"
  38 #include "hw/s390x/sclp.h"
  39 #include "hw/s390x/s390-virtio.h"
  40
  41 //#define DEBUG_S390
  42
  43 #ifdef DEBUG_S390
  44 #define dprintf(fmt, ...) \
  45     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  46 #else
  47 #define dprintf(fmt, ...) \
  48     do { } while (0)
  49 #endif
  50
  51 #define MAX_BLK_DEVS                    10
  52
  53 static VirtIOS390Bus *s390_bus;
  54 static S390CPU **ipi_states;
  55
  56 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
  57 {
  58     if (cpu_addr >= smp_cpus) {
  59         return NULL;
  60     }
  61
  62     return ipi_states[cpu_addr];
  63 }
  64
  65 static int s390_virtio_hcall_notify(const uint64_t *args)
  66 {
  67     uint64_t mem = args[0];
  68     int r = 0, i;
  69
  70     if (mem > ram_size) {
  71         VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
  72         if (dev) {
  73             virtio_queue_notify(dev->vdev, i);
  74         } else {
  75             r = -EINVAL;
  76         }
  77     } else {
  78         /* Early printk */
  79     }
  80     return r;
  81 }
  82
  83 static int s390_virtio_hcall_reset(const uint64_t *args)
  84 {
  85     uint64_t mem = args[0];
  86     VirtIOS390Device *dev;
  87
  88     dev = s390_virtio_bus_find_mem(s390_bus, mem);
  89     virtio_reset(dev->vdev);
  90     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
  91     s390_virtio_device_sync(dev);
  92     s390_virtio_reset_idx(dev);
  93
  94     return 0;
  95 }
  96
  97 static int s390_virtio_hcall_set_status(const uint64_t *args)
  98 {
  99     uint64_t mem = args[0];
 100     int r = 0;
 101     VirtIOS390Device *dev;
 102
 103     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 104     if (dev) {
 105         s390_virtio_device_update_status(dev);
 106     } else {
 107         r = -EINVAL;
 108     }
 109     return r;
 110 }
 111
 112 static void s390_virtio_register_hcalls(void)
 113 {
 114     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 115                                    s390_virtio_hcall_notify);
 116     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 117                                    s390_virtio_hcall_reset);
 118     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 119                                    s390_virtio_hcall_set_status);
 120 }
 121
 122 /*
 123  * The number of running CPUs. On s390 a shutdown is the state of all CPUs
 124  * being either stopped or disabled (for interrupts) waiting. We have to
 125  * track this number to call the shutdown sequence accordingly. This
 126  * number is modified either on startup or while holding the big qemu lock.
 127  */
 128 static unsigned s390_running_cpus;
 129
 130 void s390_add_running_cpu(CPUS390XState *env)
 131 {
 132     if (env->halted) {
 133         s390_running_cpus++;
 134         env->halted = 0;
 135         env->exception_index = -1;
 136     }
 137 }
 138
 139 unsigned s390_del_running_cpu(CPUS390XState *env)
 140 {
 141     if (env->halted == 0) {
 142         assert(s390_running_cpus >= 1);
 143         s390_running_cpus--;
 144         env->halted = 1;
 145         env->exception_index = EXCP_HLT;
 146     }
 147     return s390_running_cpus;
 148 }
 149
 150 void s390_init_ipl_dev(const char *kernel_filename,
 151                        const char *kernel_cmdline,
 152                        const char *initrd_filename)
 153 {
 154     DeviceState *dev;
 155
 156     dev  = qdev_create(NULL, "s390-ipl");
 157     if (kernel_filename) {
 158         qdev_prop_set_string(dev, "kernel", kernel_filename);
 159     }
 160     if (initrd_filename) {
 161         qdev_prop_set_string(dev, "initrd", initrd_filename);
 162     }
 163     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 164     qdev_init_nofail(dev);
 165 }
 166
 167 void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
 168 {
 169     int i;
 170
 171     if (cpu_model == NULL) {
 172         cpu_model = "host";
 173     }
 174
 175     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 176
 177     for (i = 0; i < smp_cpus; i++) {
 178         S390CPU *cpu;
 179
 180         cpu = cpu_s390x_init(cpu_model);
 181
 182         ipi_states[i] = cpu;
 183         cpu->env.halted = 1;
 184         cpu->env.exception_index = EXCP_HLT;
 185         cpu->env.storage_keys = storage_keys;
 186     }
 187 }
 188
 189
 190 void s390_create_virtio_net(BusState *bus, const char *name)
 191 {
 192     int i;
 193
 194     for (i = 0; i < nb_nics; i++) {
 195         NICInfo *nd = &nd_table[i];
 196         DeviceState *dev;
 197
 198         if (!nd->model) {
 199             nd->model = g_strdup("virtio");
 200         }
 201
 202         if (strcmp(nd->model, "virtio")) {
 203             fprintf(stderr, "S390 only supports VirtIO nics\n");
 204             exit(1);
 205         }
 206
 207         dev = qdev_create(bus, name);
 208         qdev_set_nic_properties(dev, nd);
 209         qdev_init_nofail(dev);
 210     }
 211 }
 212
 213 /* PC hardware initialisation */
 214 static void s390_init(QEMUMachineInitArgs *args)
 215 {
 216     ram_addr_t my_ram_size = args->ram_size;
 217     MemoryRegion *sysmem = get_system_memory();
 218     MemoryRegion *ram = g_new(MemoryRegion, 1);
 219     int shift = 0;
 220     uint8_t *storage_keys;
 221     void *virtio_region;
 222     hwaddr virtio_region_len;
 223     hwaddr virtio_region_start;
 224
 225     /* s390x ram size detection needs a 16bit multiplier + an increment. So
 226        guests > 64GB can be specified in 2MB steps etc. */
 227     while ((my_ram_size >> (20 + shift)) > 65535) {
 228         shift++;
 229     }
 230     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 231
 232     /* lets propagate the changed ram size into the global variable. */
 233     ram_size = my_ram_size;
 234
 235     /* get a BUS */
 236     s390_bus = s390_virtio_bus_init(&my_ram_size);
 237     s390_sclp_init();
 238     s390_init_ipl_dev(args->kernel_filename, args->kernel_cmdline,
 239                       args->initrd_filename);
 240
 241     /* register hypercalls */
 242     s390_virtio_register_hcalls();
 243
 244     /* allocate RAM */
 245     memory_region_init_ram(ram, "s390.ram", my_ram_size);
 246     vmstate_register_ram_global(ram);
 247     memory_region_add_subregion(sysmem, 0, ram);
 248
 249     /* clear virtio region */
 250     virtio_region_len = my_ram_size - ram_size;
 251     virtio_region_start = ram_size;
 252     virtio_region = cpu_physical_memory_map(virtio_region_start,
 253                                             &virtio_region_len, true);
 254     memset(virtio_region, 0, virtio_region_len);
 255     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 256                               virtio_region_len);
 257
 258     /* allocate storage keys */
 259     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 260
 261     /* init CPUs */
 262     s390_init_cpus(args->cpu_model, storage_keys);
 263
 264     /* Create VirtIO network adapters */
 265     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 266 }
 267
 268 static QEMUMachine s390_machine = {
 269     .name = "s390-virtio",
 270     .alias = "s390",
 271     .desc = "VirtIO based S390 machine",
 272     .init = s390_init,
 273     .block_default_type = IF_VIRTIO,
 274     .no_cdrom = 1,
 275     .no_floppy = 1,
 276     .no_serial = 1,
 277     .no_parallel = 1,
 278     .no_sdcard = 1,
 279     .use_virtcon = 1,
 280     .max_cpus = 255,
 281     .is_default = 1,
 282     DEFAULT_MACHINE_OPTIONS,
 283 };
 284
 285 static void s390_machine_init(void)
 286 {
 287     qemu_register_machine(&s390_machine);
 288 }
 289
 290 machine_init(s390_machine_init);