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 #include "exec-memory.h"
  33
  34 #include "hw/s390-virtio-bus.h"
  35
  36 //#define DEBUG_S390
  37
  38 #ifdef DEBUG_S390
  39 #define dprintf(fmt, ...) \
  40     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  41 #else
  42 #define dprintf(fmt, ...) \
  43     do { } while (0)
  44 #endif
  45
  46 #define KVM_S390_VIRTIO_NOTIFY          0
  47 #define KVM_S390_VIRTIO_RESET           1
  48 #define KVM_S390_VIRTIO_SET_STATUS      2
  49
  50 #define KERN_IMAGE_START                0x010000UL
  51 #define KERN_PARM_AREA                  0x010480UL
  52 #define INITRD_START                    0x800000UL
  53 #define INITRD_PARM_START               0x010408UL
  54 #define INITRD_PARM_SIZE                0x010410UL
  55 #define PARMFILE_START                  0x001000UL
  56
  57 #define ZIPL_START                      0x009000UL
  58 #define ZIPL_LOAD_ADDR                  0x009000UL
  59 #define ZIPL_FILENAME                   "s390-zipl.rom"
  60
  61 #define MAX_BLK_DEVS                    10
  62
  63 static VirtIOS390Bus *s390_bus;
  64 static CPUState **ipi_states;
  65
  66 CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
  67 {
  68     if (cpu_addr >= smp_cpus) {
  69         return NULL;
  70     }
  71
  72     return ipi_states[cpu_addr];
  73 }
  74
  75 int s390_virtio_hypercall(CPUState *env, uint64_t mem, uint64_t hypercall)
  76 {
  77     int r = 0, i;
  78
  79     dprintf("KVM hypercall: %ld\n", hypercall);
  80     switch (hypercall) {
  81     case KVM_S390_VIRTIO_NOTIFY:
  82         if (mem > ram_size) {
  83             VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
  84                                                                mem, &i);
  85             if (dev) {
  86                 virtio_queue_notify(dev->vdev, i);
  87             } else {
  88                 r = -EINVAL;
  89             }
  90         } else {
  91             /* Early printk */
  92         }
  93         break;
  94     case KVM_S390_VIRTIO_RESET:
  95     {
  96         VirtIOS390Device *dev;
  97
  98         dev = s390_virtio_bus_find_mem(s390_bus, mem);
  99         virtio_reset(dev->vdev);
 100         s390_virtio_device_sync(dev);
 101         break;
 102     }
 103     case KVM_S390_VIRTIO_SET_STATUS:
 104     {
 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         break;
 114     }
 115     default:
 116         r = -EINVAL;
 117         break;
 118     }
 119
 120     return r;
 121 }
 122
 123 /* PC hardware initialisation */
 124 static void s390_init(ram_addr_t my_ram_size,
 125                       const char *boot_device,
 126                       const char *kernel_filename,
 127                       const char *kernel_cmdline,
 128                       const char *initrd_filename,
 129                       const char *cpu_model)
 130 {
 131     CPUState *env = NULL;
 132     MemoryRegion *sysmem = get_system_memory();
 133     MemoryRegion *ram = g_new(MemoryRegion, 1);
 134     ram_addr_t kernel_size = 0;
 135     ram_addr_t initrd_offset;
 136     ram_addr_t initrd_size = 0;
 137     int shift = 0;
 138     uint8_t *storage_keys;
 139     int i;
 140
 141     /* s390x ram size detection needs a 16bit multiplier + an increment. So
 142        guests > 64GB can be specified in 2MB steps etc. */
 143     while ((my_ram_size >> (20 + shift)) > 65535) {
 144         shift++;
 145     }
 146     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 147
 148     /* lets propagate the changed ram size into the global variable. */
 149     ram_size = my_ram_size;
 150
 151     /* get a BUS */
 152     s390_bus = s390_virtio_bus_init(&my_ram_size);
 153
 154     /* allocate RAM */
 155     memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size);
 156     memory_region_add_subregion(sysmem, 0, ram);
 157
 158     /* allocate storage keys */
 159     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 160
 161     /* init CPUs */
 162     if (cpu_model == NULL) {
 163         cpu_model = "host";
 164     }
 165
 166     ipi_states = g_malloc(sizeof(CPUState *) * smp_cpus);
 167
 168     for (i = 0; i < smp_cpus; i++) {
 169         CPUState *tmp_env;
 170
 171         tmp_env = cpu_init(cpu_model);
 172         if (!env) {
 173             env = tmp_env;
 174         }
 175         ipi_states[i] = tmp_env;
 176         tmp_env->halted = 1;
 177         tmp_env->exception_index = EXCP_HLT;
 178         tmp_env->storage_keys = storage_keys;
 179     }
 180
 181     env->halted = 0;
 182     env->exception_index = 0;
 183
 184     if (kernel_filename) {
 185         kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
 186
 187         if (lduw_be_phys(KERN_IMAGE_START) != 0x0dd0) {
 188             fprintf(stderr, "Specified image is not an s390 boot image\n");
 189             exit(1);
 190         }
 191
 192         env->psw.addr = KERN_IMAGE_START;
 193         env->psw.mask = 0x0000000180000000ULL;
 194     } else {
 195         ram_addr_t bios_size = 0;
 196         char *bios_filename;
 197
 198         /* Load zipl bootloader */
 199         if (bios_name == NULL) {
 200             bios_name = ZIPL_FILENAME;
 201         }
 202
 203         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 204         bios_size = load_image(bios_filename, qemu_get_ram_ptr(ZIPL_LOAD_ADDR));
 205         g_free(bios_filename);
 206
 207         if ((long)bios_size < 0) {
 208             hw_error("could not load bootloader '%s'\n", bios_name);
 209         }
 210
 211         if (bios_size > 4096) {
 212             hw_error("stage1 bootloader is > 4k\n");
 213         }
 214
 215         env->psw.addr = ZIPL_START;
 216         env->psw.mask = 0x0000000180000000ULL;
 217     }
 218
 219     if (initrd_filename) {
 220         initrd_offset = INITRD_START;
 221         while (kernel_size + 0x100000 > initrd_offset) {
 222             initrd_offset += 0x100000;
 223         }
 224         initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
 225
 226         stq_be_phys(INITRD_PARM_START, initrd_offset);
 227         stq_be_phys(INITRD_PARM_SIZE, initrd_size);
 228     }
 229
 230     if (kernel_cmdline) {
 231         cpu_physical_memory_write(KERN_PARM_AREA, kernel_cmdline,
 232                                   strlen(kernel_cmdline));
 233     }
 234
 235     /* Create VirtIO network adapters */
 236     for(i = 0; i < nb_nics; i++) {
 237         NICInfo *nd = &nd_table[i];
 238         DeviceState *dev;
 239
 240         if (!nd->model) {
 241             nd->model = g_strdup("virtio");
 242         }
 243
 244         if (strcmp(nd->model, "virtio")) {
 245             fprintf(stderr, "S390 only supports VirtIO nics\n");
 246             exit(1);
 247         }
 248
 249         dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
 250         qdev_set_nic_properties(dev, nd);
 251         qdev_init_nofail(dev);
 252     }
 253
 254     /* Create VirtIO disk drives */
 255     for(i = 0; i < MAX_BLK_DEVS; i++) {
 256         DriveInfo *dinfo;
 257         DeviceState *dev;
 258
 259         dinfo = drive_get(IF_IDE, 0, i);
 260         if (!dinfo) {
 261             continue;
 262         }
 263
 264         dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
 265         qdev_prop_set_drive_nofail(dev, "drive", dinfo->bdrv);
 266         qdev_init_nofail(dev);
 267     }
 268 }
 269
 270 static QEMUMachine s390_machine = {
 271     .name = "s390-virtio",
 272     .alias = "s390",
 273     .desc = "VirtIO based S390 machine",
 274     .init = s390_init,
 275     .no_serial = 1,
 276     .no_parallel = 1,
 277     .use_virtcon = 1,
 278     .no_vga = 1,
 279     .max_cpus = 255,
 280     .is_default = 1,
 281 };
 282
 283 static void s390_machine_init(void)
 284 {
 285     qemu_register_machine(&s390_machine);
 286 }
 287
 288 machine_init(s390_machine_init);