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 "sysemu.h"
  23 #include "net.h"
  24 #include "boards.h"
  25 #include "monitor.h"
  26 #include "loader.h"
  27 #include "elf.h"
  28 #include "hw/virtio.h"
  29 #include "hw/sysbus.h"
  30 #include "kvm.h"
  31
  32 #include "hw/s390-virtio-bus.h"
  33
  34 //#define DEBUG_S390
  35
  36 #ifdef DEBUG_S390
  37 #define dprintf(fmt, ...) \
  38     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  39 #else
  40 #define dprintf(fmt, ...) \
  41     do { } while (0)
  42 #endif
  43
  44 #define KVM_S390_VIRTIO_NOTIFY          0
  45 #define KVM_S390_VIRTIO_RESET           1
  46 #define KVM_S390_VIRTIO_SET_STATUS      2
  47
  48 #define KERN_IMAGE_START                0x010000UL
  49 #define KERN_PARM_AREA                  0x010480UL
  50 #define INITRD_START                    0x800000UL
  51 #define INITRD_PARM_START               0x010408UL
  52 #define INITRD_PARM_SIZE                0x010410UL
  53 #define PARMFILE_START                  0x001000UL
  54
  55 #define MAX_BLK_DEVS                    10
  56
  57 static VirtIOS390Bus *s390_bus;
  58 static CPUState **ipi_states;
  59
  60 void irq_info(Monitor *mon);
  61 void pic_info(Monitor *mon);
  62
  63 void irq_info(Monitor *mon)
  64 {
  65 }
  66
  67 void pic_info(Monitor *mon)
  68 {
  69 }
  70
  71 CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
  72 {
  73     if (cpu_addr >= smp_cpus) {
  74         return NULL;
  75     }
  76
  77     return ipi_states[cpu_addr];
  78 }
  79
  80 int s390_virtio_hypercall(CPUState *env)
  81 {
  82     int r = 0, i;
  83     target_ulong mem = env->regs[2];
  84
  85     dprintf("KVM hypercall: %ld\n", env->regs[1]);
  86     switch (env->regs[1]) {
  87     case KVM_S390_VIRTIO_NOTIFY:
  88         if (mem > ram_size) {
  89             VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
  90                                                                mem, &i);
  91             if (dev) {
  92                 virtio_queue_notify(dev->vdev, i);
  93             } else {
  94                 r = -EINVAL;
  95             }
  96         } else {
  97             /* Early printk */
  98         }
  99         break;
 100     case KVM_S390_VIRTIO_RESET:
 101     {
 102         /* Virtio_reset resets the internal addresses, so we'd have to sync
 103            them up again. We don't want to reallocate a vring though, so let's
 104            just not reset. */
 105         /* virtio_reset(dev->vdev); */
 106         break;
 107     }
 108     case KVM_S390_VIRTIO_SET_STATUS:
 109     {
 110         VirtIOS390Device *dev;
 111
 112         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 113         if (dev) {
 114             s390_virtio_device_update_status(dev);
 115         } else {
 116             r = -EINVAL;
 117         }
 118         break;
 119     }
 120     default:
 121         r = -EINVAL;
 122         break;
 123     }
 124
 125     env->regs[2] = r;
 126     return 0;
 127 }
 128
 129 /* PC hardware initialisation */
 130 static void s390_init(ram_addr_t ram_size,
 131                       const char *boot_device,
 132                       const char *kernel_filename,
 133                       const char *kernel_cmdline,
 134                       const char *initrd_filename,
 135                       const char *cpu_model)
 136 {
 137     CPUState *env = NULL;
 138     ram_addr_t ram_addr;
 139     ram_addr_t kernel_size = 0;
 140     ram_addr_t initrd_offset;
 141     ram_addr_t initrd_size = 0;
 142     int i;
 143
 144     /* XXX we only work on KVM for now */
 145
 146     if (!kvm_enabled()) {
 147         fprintf(stderr, "The S390 target only works with KVM enabled\n");
 148         exit(1);
 149     }
 150
 151     /* get a BUS */
 152     s390_bus = s390_virtio_bus_init(&ram_size);
 153
 154     /* allocate RAM */
 155     ram_addr = qemu_ram_alloc(ram_size);
 156     cpu_register_physical_memory(0, ram_size, ram_addr);
 157
 158     /* init CPUs */
 159     if (cpu_model == NULL) {
 160         cpu_model = "host";
 161     }
 162
 163     ipi_states = qemu_malloc(sizeof(CPUState *) * smp_cpus);
 164
 165     for (i = 0; i < smp_cpus; i++) {
 166         CPUState *tmp_env;
 167
 168         tmp_env = cpu_init(cpu_model);
 169         if (!env) {
 170             env = tmp_env;
 171         }
 172         ipi_states[i] = tmp_env;
 173         tmp_env->halted = 1;
 174         tmp_env->exception_index = EXCP_HLT;
 175     }
 176
 177     env->halted = 0;
 178     env->exception_index = 0;
 179
 180     if (kernel_filename) {
 181         kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
 182
 183         if (lduw_phys(KERN_IMAGE_START) != 0x0dd0) {
 184             fprintf(stderr, "Specified image is not an s390 boot image\n");
 185             exit(1);
 186         }
 187
 188         env->psw.addr = KERN_IMAGE_START;
 189         env->psw.mask = 0x0000000180000000ULL;
 190     }
 191
 192     if (initrd_filename) {
 193         initrd_offset = INITRD_START;
 194         while (kernel_size + 0x100000 > initrd_offset) {
 195             initrd_offset += 0x100000;
 196         }
 197         initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
 198
 199         stq_phys(INITRD_PARM_START, initrd_offset);
 200         stq_phys(INITRD_PARM_SIZE, initrd_size);
 201     }
 202
 203     if (kernel_cmdline) {
 204         cpu_physical_memory_rw(KERN_PARM_AREA, (uint8_t *)kernel_cmdline,
 205                                strlen(kernel_cmdline), 1);
 206     }
 207
 208     /* Create VirtIO network adapters */
 209     for(i = 0; i < nb_nics; i++) {
 210         NICInfo *nd = &nd_table[i];
 211         DeviceState *dev;
 212
 213         if (!nd->model) {
 214             nd->model = qemu_strdup("virtio");
 215         }
 216
 217         if (strcmp(nd->model, "virtio")) {
 218             fprintf(stderr, "S390 only supports VirtIO nics\n");
 219             exit(1);
 220         }
 221
 222         dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
 223         qdev_set_nic_properties(dev, nd);
 224         qdev_init_nofail(dev);
 225     }
 226
 227     /* Create VirtIO disk drives */
 228     for(i = 0; i < MAX_BLK_DEVS; i++) {
 229         DriveInfo *dinfo;
 230         DeviceState *dev;
 231
 232         dinfo = drive_get(IF_IDE, 0, i);
 233         if (!dinfo) {
 234             continue;
 235         }
 236
 237         dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
 238         qdev_prop_set_drive(dev, "drive", dinfo);
 239         qdev_init_nofail(dev);
 240     }
 241 }
 242
 243 static QEMUMachine s390_machine = {
 244     .name = "s390-virtio",
 245     .alias = "s390",
 246     .desc = "VirtIO based S390 machine",
 247     .init = s390_init,
 248     .no_serial = 1,
 249     .no_parallel = 1,
 250     .use_virtcon = 1,
 251     .no_vga = 1,
 252     .max_cpus = 255,
 253     .is_default = 1,
 254 };
 255
 256 static void s390_machine_init(void)
 257 {
 258     qemu_register_machine(&s390_machine);
 259 }
 260
 261 machine_init(s390_machine_init);