hw/s390-virtio.c

   1 /*
   2  * QEMU S390 virtio target
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "hw.h"
  21 #include "block.h"
  22 #include "blockdev.h"
  23 #include "sysemu.h"
  24 #include "net.h"
  25 #include "boards.h"
  26 #include "monitor.h"
  27 #include "loader.h"
  28 #include "elf.h"
  29 #include "hw/virtio.h"
  30 #include "hw/sysbus.h"
  31 #include "kvm.h"
  32
  33 #include "hw/s390-virtio-bus.h"
  34
  35 //#define DEBUG_S390
  36
  37 #ifdef DEBUG_S390
  38 #define dprintf(fmt, ...) \
  39     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  40 #else
  41 #define dprintf(fmt, ...) \
  42     do { } while (0)
  43 #endif
  44
  45 #define KVM_S390_VIRTIO_NOTIFY          0
  46 #define KVM_S390_VIRTIO_RESET           1
  47 #define KVM_S390_VIRTIO_SET_STATUS      2
  48
  49 #define KERN_IMAGE_START                0x010000UL
  50 #define KERN_PARM_AREA                  0x010480UL
  51 #define INITRD_START                    0x800000UL
  52 #define INITRD_PARM_START               0x010408UL
  53 #define INITRD_PARM_SIZE                0x010410UL
  54 #define PARMFILE_START                  0x001000UL
  55
  56 #define ZIPL_START                      0x009000UL
  57 #define ZIPL_LOAD_ADDR                  0x009000UL
  58 #define ZIPL_FILENAME                   "s390-zipl.rom"
  59
  60 #define MAX_BLK_DEVS                    10
  61
  62 static VirtIOS390Bus *s390_bus;
  63 static CPUState **ipi_states;
  64
  65 CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
  66 {
  67     if (cpu_addr >= smp_cpus) {
  68         return NULL;
  69     }
  70
  71     return ipi_states[cpu_addr];
  72 }
  73
  74 int s390_virtio_hypercall(CPUState *env, uint64_t mem, uint64_t hypercall)
  75 {
  76     int r = 0, i;
  77
  78     dprintf("KVM hypercall: %ld\n", hypercall);
  79     switch (hypercall) {
  80     case KVM_S390_VIRTIO_NOTIFY:
  81         if (mem > ram_size) {
  82             VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
  83                                                                mem, &i);
  84             if (dev) {
  85                 virtio_queue_notify(dev->vdev, i);
  86             } else {
  87                 r = -EINVAL;
  88             }
  89         } else {
  90             /* Early printk */
  91         }
  92         break;
  93     case KVM_S390_VIRTIO_RESET:
  94     {
  95         VirtIOS390Device *dev;
  96
  97         dev = s390_virtio_bus_find_mem(s390_bus, mem);
  98         virtio_reset(dev->vdev);
  99         s390_virtio_device_sync(dev);
 100         break;
 101     }
 102     case KVM_S390_VIRTIO_SET_STATUS:
 103     {
 104         VirtIOS390Device *dev;
 105
 106         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 107         if (dev) {
 108             s390_virtio_device_update_status(dev);
 109         } else {
 110             r = -EINVAL;
 111         }
 112         break;
 113     }
 114     default:
 115         r = -EINVAL;
 116         break;
 117     }
 118
 119     return r;
 120 }
 121
 122 /* PC hardware initialisation */
 123 static void s390_init(ram_addr_t my_ram_size,
 124                       const char *boot_device,
 125                       const char *kernel_filename,
 126                       const char *kernel_cmdline,
 127                       const char *initrd_filename,
 128                       const char *cpu_model)
 129 {
 130     CPUState *env = NULL;
 131     ram_addr_t ram_addr;
 132     ram_addr_t kernel_size = 0;
 133     ram_addr_t initrd_offset;
 134     ram_addr_t initrd_size = 0;
 135     int shift = 0;
 136     uint8_t *storage_keys;
 137     int i;
 138
 139     /* s390x ram size detection needs a 16bit multiplier + an increment. So
 140        guests > 64GB can be specified in 2MB steps etc. */
 141     while ((my_ram_size >> (20 + shift)) > 65535) {
 142         shift++;
 143     }
 144     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 145
 146     /* lets propagate the changed ram size into the global variable. */
 147     ram_size = my_ram_size;
 148
 149     /* get a BUS */
 150     s390_bus = s390_virtio_bus_init(&my_ram_size);
 151
 152     /* allocate RAM */
 153     ram_addr = qemu_ram_alloc(NULL, "s390.ram", my_ram_size);
 154     cpu_register_physical_memory(0, my_ram_size, ram_addr);
 155
 156     /* allocate storage keys */
 157     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 158
 159     /* init CPUs */
 160     if (cpu_model == NULL) {
 161         cpu_model = "host";
 162     }
 163
 164     ipi_states = g_malloc(sizeof(CPUState *) * smp_cpus);
 165
 166     for (i = 0; i < smp_cpus; i++) {
 167         CPUState *tmp_env;
 168
 169         tmp_env = cpu_init(cpu_model);
 170         if (!env) {
 171             env = tmp_env;
 172         }
 173         ipi_states[i] = tmp_env;
 174         tmp_env->halted = 1;
 175         tmp_env->exception_index = EXCP_HLT;
 176         tmp_env->storage_keys = storage_keys;
 177     }
 178
 179     env->halted = 0;
 180     env->exception_index = 0;
 181
 182     if (kernel_filename) {
 183         kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
 184
 185         if (lduw_be_phys(KERN_IMAGE_START) != 0x0dd0) {
 186             fprintf(stderr, "Specified image is not an s390 boot image\n");
 187             exit(1);
 188         }
 189
 190         env->psw.addr = KERN_IMAGE_START;
 191         env->psw.mask = 0x0000000180000000ULL;
 192     } else {
 193         ram_addr_t bios_size = 0;
 194         char *bios_filename;
 195
 196         /* Load zipl bootloader */
 197         if (bios_name == NULL) {
 198             bios_name = ZIPL_FILENAME;
 199         }
 200
 201         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 202         bios_size = load_image(bios_filename, qemu_get_ram_ptr(ZIPL_LOAD_ADDR));
 203         g_free(bios_filename);
 204
 205         if ((long)bios_size < 0) {
 206             hw_error("could not load bootloader '%s'\n", bios_name);
 207         }
 208
 209         if (bios_size > 4096) {
 210             hw_error("stage1 bootloader is > 4k\n");
 211         }
 212
 213         env->psw.addr = ZIPL_START;
 214         env->psw.mask = 0x0000000180000000ULL;
 215     }
 216
 217     if (initrd_filename) {
 218         initrd_offset = INITRD_START;
 219         while (kernel_size + 0x100000 > initrd_offset) {
 220             initrd_offset += 0x100000;
 221         }
 222         initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
 223
 224         stq_be_phys(INITRD_PARM_START, initrd_offset);
 225         stq_be_phys(INITRD_PARM_SIZE, initrd_size);
 226     }
 227
 228     if (kernel_cmdline) {
 229         cpu_physical_memory_write(KERN_PARM_AREA, kernel_cmdline,
 230                                   strlen(kernel_cmdline));
 231     }
 232
 233     /* Create VirtIO network adapters */
 234     for(i = 0; i < nb_nics; i++) {
 235         NICInfo *nd = &nd_table[i];
 236         DeviceState *dev;
 237
 238         if (!nd->model) {
 239             nd->model = g_strdup("virtio");
 240         }
 241
 242         if (strcmp(nd->model, "virtio")) {
 243             fprintf(stderr, "S390 only supports VirtIO nics\n");
 244             exit(1);
 245         }
 246
 247         dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
 248         qdev_set_nic_properties(dev, nd);
 249         qdev_init_nofail(dev);
 250     }
 251
 252     /* Create VirtIO disk drives */
 253     for(i = 0; i < MAX_BLK_DEVS; i++) {
 254         DriveInfo *dinfo;
 255         DeviceState *dev;
 256
 257         dinfo = drive_get(IF_IDE, 0, i);
 258         if (!dinfo) {
 259             continue;
 260         }
 261
 262         dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
 263         qdev_prop_set_drive_nofail(dev, "drive", dinfo->bdrv);
 264         qdev_init_nofail(dev);
 265     }
 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     .no_serial = 1,
 274     .no_parallel = 1,
 275     .use_virtcon = 1,
 276     .no_vga = 1,
 277     .max_cpus = 255,
 278     .is_default = 1,
 279 };
 280
 281 static void s390_machine_init(void)
 282 {
 283     qemu_register_machine(&s390_machine);
 284 }
 285
 286 machine_init(s390_machine_init);