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/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 #define ZIPL_FILENAME                   "s390-zipl.rom"
  53
  54 static VirtIOS390Bus *s390_bus;
  55 static S390CPU **ipi_states;
  56
  57 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
  58 {
  59     if (cpu_addr >= smp_cpus) {
  60         return NULL;
  61     }
  62
  63     return ipi_states[cpu_addr];
  64 }
  65
  66 static int s390_virtio_hcall_notify(const uint64_t *args)
  67 {
  68     uint64_t mem = args[0];
  69     int r = 0, i;
  70
  71     if (mem > ram_size) {
  72         VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
  73         if (dev) {
  74             virtio_queue_notify(dev->vdev, i);
  75         } else {
  76             r = -EINVAL;
  77         }
  78     } else {
  79         /* Early printk */
  80     }
  81     return r;
  82 }
  83
  84 static int s390_virtio_hcall_reset(const uint64_t *args)
  85 {
  86     uint64_t mem = args[0];
  87     VirtIOS390Device *dev;
  88
  89     dev = s390_virtio_bus_find_mem(s390_bus, mem);
  90     if (dev == NULL) {
  91         return -EINVAL;
  92     }
  93     virtio_reset(dev->vdev);
  94     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
  95     s390_virtio_device_sync(dev);
  96     s390_virtio_reset_idx(dev);
  97
  98     return 0;
  99 }
 100
 101 static int s390_virtio_hcall_set_status(const uint64_t *args)
 102 {
 103     uint64_t mem = args[0];
 104     int r = 0;
 105     VirtIOS390Device *dev;
 106
 107     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 108     if (dev) {
 109         s390_virtio_device_update_status(dev);
 110     } else {
 111         r = -EINVAL;
 112     }
 113     return r;
 114 }
 115
 116 static void s390_virtio_register_hcalls(void)
 117 {
 118     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 119                                    s390_virtio_hcall_notify);
 120     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 121                                    s390_virtio_hcall_reset);
 122     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 123                                    s390_virtio_hcall_set_status);
 124 }
 125
 126 /*
 127  * The number of running CPUs. On s390 a shutdown is the state of all CPUs
 128  * being either stopped or disabled (for interrupts) waiting. We have to
 129  * track this number to call the shutdown sequence accordingly. This
 130  * number is modified either on startup or while holding the big qemu lock.
 131  */
 132 static unsigned s390_running_cpus;
 133
 134 void s390_add_running_cpu(S390CPU *cpu)
 135 {
 136     CPUState *cs = CPU(cpu);
 137     CPUS390XState *env = &cpu->env;
 138
 139     if (cs->halted) {
 140         s390_running_cpus++;
 141         cs->halted = 0;
 142         env->exception_index = -1;
 143     }
 144 }
 145
 146 unsigned s390_del_running_cpu(S390CPU *cpu)
 147 {
 148     CPUState *cs = CPU(cpu);
 149     CPUS390XState *env = &cpu->env;
 150
 151     if (cs->halted == 0) {
 152         assert(s390_running_cpus >= 1);
 153         s390_running_cpus--;
 154         cs->halted = 1;
 155         env->exception_index = EXCP_HLT;
 156     }
 157     return s390_running_cpus;
 158 }
 159
 160 void s390_init_ipl_dev(const char *kernel_filename,
 161                        const char *kernel_cmdline,
 162                        const char *initrd_filename,
 163                        const char *firmware)
 164 {
 165     DeviceState *dev;
 166
 167     dev  = qdev_create(NULL, "s390-ipl");
 168     if (kernel_filename) {
 169         qdev_prop_set_string(dev, "kernel", kernel_filename);
 170     }
 171     if (initrd_filename) {
 172         qdev_prop_set_string(dev, "initrd", initrd_filename);
 173     }
 174     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 175     qdev_prop_set_string(dev, "firmware", firmware);
 176     qdev_init_nofail(dev);
 177 }
 178
 179 void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
 180 {
 181     int i;
 182
 183     if (cpu_model == NULL) {
 184         cpu_model = "host";
 185     }
 186
 187     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 188
 189     for (i = 0; i < smp_cpus; i++) {
 190         S390CPU *cpu;
 191         CPUState *cs;
 192
 193         cpu = cpu_s390x_init(cpu_model);
 194         cs = CPU(cpu);
 195
 196         ipi_states[i] = cpu;
 197         cs->halted = 1;
 198         cpu->env.exception_index = EXCP_HLT;
 199         cpu->env.storage_keys = storage_keys;
 200     }
 201 }
 202
 203
 204 void s390_create_virtio_net(BusState *bus, const char *name)
 205 {
 206     int i;
 207
 208     for (i = 0; i < nb_nics; i++) {
 209         NICInfo *nd = &nd_table[i];
 210         DeviceState *dev;
 211
 212         if (!nd->model) {
 213             nd->model = g_strdup("virtio");
 214         }
 215
 216         if (strcmp(nd->model, "virtio")) {
 217             fprintf(stderr, "S390 only supports VirtIO nics\n");
 218             exit(1);
 219         }
 220
 221         dev = qdev_create(bus, name);
 222         qdev_set_nic_properties(dev, nd);
 223         qdev_init_nofail(dev);
 224     }
 225 }
 226
 227 /* PC hardware initialisation */
 228 static void s390_init(QEMUMachineInitArgs *args)
 229 {
 230     ram_addr_t my_ram_size = args->ram_size;
 231     MemoryRegion *sysmem = get_system_memory();
 232     MemoryRegion *ram = g_new(MemoryRegion, 1);
 233     int shift = 0;
 234     uint8_t *storage_keys;
 235     void *virtio_region;
 236     hwaddr virtio_region_len;
 237     hwaddr virtio_region_start;
 238
 239     /* s390x ram size detection needs a 16bit multiplier + an increment. So
 240        guests > 64GB can be specified in 2MB steps etc. */
 241     while ((my_ram_size >> (20 + shift)) > 65535) {
 242         shift++;
 243     }
 244     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 245
 246     /* let's propagate the changed ram size into the global variable. */
 247     ram_size = my_ram_size;
 248
 249     /* get a BUS */
 250     s390_bus = s390_virtio_bus_init(&my_ram_size);
 251     s390_sclp_init();
 252     s390_init_ipl_dev(args->kernel_filename, args->kernel_cmdline,
 253                       args->initrd_filename, ZIPL_FILENAME);
 254
 255     /* register hypercalls */
 256     s390_virtio_register_hcalls();
 257
 258     /* allocate RAM */
 259     memory_region_init_ram(ram, "s390.ram", my_ram_size);
 260     vmstate_register_ram_global(ram);
 261     memory_region_add_subregion(sysmem, 0, ram);
 262
 263     /* clear virtio region */
 264     virtio_region_len = my_ram_size - ram_size;
 265     virtio_region_start = ram_size;
 266     virtio_region = cpu_physical_memory_map(virtio_region_start,
 267                                             &virtio_region_len, true);
 268     memset(virtio_region, 0, virtio_region_len);
 269     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 270                               virtio_region_len);
 271
 272     /* allocate storage keys */
 273     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 274
 275     /* init CPUs */
 276     s390_init_cpus(args->cpu_model, storage_keys);
 277
 278     /* Create VirtIO network adapters */
 279     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 280 }
 281
 282 static QEMUMachine s390_machine = {
 283     .name = "s390-virtio",
 284     .alias = "s390",
 285     .desc = "VirtIO based S390 machine",
 286     .init = s390_init,
 287     .block_default_type = IF_VIRTIO,
 288     .no_cdrom = 1,
 289     .no_floppy = 1,
 290     .no_serial = 1,
 291     .no_parallel = 1,
 292     .no_sdcard = 1,
 293     .use_virtcon = 1,
 294     .max_cpus = 255,
 295     .is_default = 1,
 296     DEFAULT_MACHINE_OPTIONS,
 297 };
 298
 299 static void s390_machine_init(void)
 300 {
 301     qemu_register_machine(&s390_machine);
 302 }
 303
 304 machine_init(s390_machine_init);