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/virtio-console.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 MAX_BLK_DEVS                    10
  57
  58 static VirtIOS390Bus *s390_bus;
  59 static CPUState **ipi_states;
  60
  61 void irq_info(Monitor *mon);
  62 void pic_info(Monitor *mon);
  63
  64 void irq_info(Monitor *mon)
  65 {
  66 }
  67
  68 void pic_info(Monitor *mon)
  69 {
  70 }
  71
  72 CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
  73 {
  74     if (cpu_addr >= smp_cpus) {
  75         return NULL;
  76     }
  77
  78     return ipi_states[cpu_addr];
  79 }
  80
  81 int s390_virtio_hypercall(CPUState *env)
  82 {
  83     int r = 0, i;
  84     target_ulong mem = env->regs[2];
  85
  86     dprintf("KVM hypercall: %ld\n", env->regs[1]);
  87     switch (env->regs[1]) {
  88     case KVM_S390_VIRTIO_NOTIFY:
  89         if (mem > ram_size) {
  90             VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
  91                                                                mem, &i);
  92             if (dev) {
  93                 virtio_queue_notify(dev->vdev, i);
  94             } else {
  95                 r = -EINVAL;
  96             }
  97         } else {
  98             /* Early printk */
  99         }
 100         break;
 101     case KVM_S390_VIRTIO_RESET:
 102     {
 103         /* Virtio_reset resets the internal addresses, so we'd have to sync
 104            them up again. We don't want to reallocate a vring though, so let's
 105            just not reset. */
 106         /* virtio_reset(dev->vdev); */
 107         break;
 108     }
 109     case KVM_S390_VIRTIO_SET_STATUS:
 110     {
 111         VirtIOS390Device *dev;
 112
 113         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 114         if (dev) {
 115             s390_virtio_device_update_status(dev);
 116         } else {
 117             r = -EINVAL;
 118         }
 119         break;
 120     }
 121     default:
 122         r = -EINVAL;
 123         break;
 124     }
 125
 126     env->regs[2] = r;
 127     return 0;
 128 }
 129
 130 /* PC hardware initialisation */
 131 static void s390_init(ram_addr_t ram_size,
 132                       const char *boot_device,
 133                       const char *kernel_filename,
 134                       const char *kernel_cmdline,
 135                       const char *initrd_filename,
 136                       const char *cpu_model)
 137 {
 138     CPUState *env = NULL;
 139     ram_addr_t ram_addr;
 140     ram_addr_t kernel_size = 0;
 141     ram_addr_t initrd_offset;
 142     ram_addr_t initrd_size = 0;
 143     int i;
 144
 145     /* XXX we only work on KVM for now */
 146
 147     if (!kvm_enabled()) {
 148         fprintf(stderr, "The S390 target only works with KVM enabled\n");
 149         exit(1);
 150     }
 151
 152     /* get a BUS */
 153     s390_bus = s390_virtio_bus_init(&ram_size);
 154
 155     /* allocate RAM */
 156     ram_addr = qemu_ram_alloc(ram_size);
 157     cpu_register_physical_memory(0, ram_size, ram_addr);
 158
 159     /* init CPUs */
 160     if (cpu_model == NULL) {
 161         cpu_model = "host";
 162     }
 163
 164     ipi_states = qemu_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     }
 177
 178     env->halted = 0;
 179     env->exception_index = 0;
 180
 181     if (kernel_filename) {
 182         kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
 183
 184         if (lduw_phys(KERN_IMAGE_START) != 0x0dd0) {
 185             fprintf(stderr, "Specified image is not an s390 boot image\n");
 186             exit(1);
 187         }
 188
 189         cpu_synchronize_state(env);
 190         env->psw.addr = KERN_IMAGE_START;
 191         env->psw.mask = 0x0000000180000000ULL;
 192     }
 193
 194     if (initrd_filename) {
 195         initrd_offset = INITRD_START;
 196         while (kernel_size + 0x100000 > initrd_offset) {
 197             initrd_offset += 0x100000;
 198         }
 199         initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
 200
 201         stq_phys(INITRD_PARM_START, initrd_offset);
 202         stq_phys(INITRD_PARM_SIZE, initrd_size);
 203     }
 204
 205     if (kernel_cmdline) {
 206         cpu_physical_memory_rw(KERN_PARM_AREA, (uint8_t *)kernel_cmdline,
 207                                strlen(kernel_cmdline), 1);
 208     }
 209
 210     /* Create VirtIO console */
 211     for(i = 0; i < MAX_VIRTIO_CONSOLES; i++) {
 212         if (virtcon_hds[i]) {
 213             qdev_init_nofail(qdev_create((BusState *)s390_bus, "virtio-console-s390"));
 214         }
 215     }
 216
 217     /* Create VirtIO network adapters */
 218     for(i = 0; i < nb_nics; i++) {
 219         NICInfo *nd = &nd_table[i];
 220         DeviceState *dev;
 221
 222         if (!nd->model) {
 223             nd->model = qemu_strdup("virtio");
 224         }
 225
 226         if (strcmp(nd->model, "virtio")) {
 227             fprintf(stderr, "S390 only supports VirtIO nics\n");
 228             exit(1);
 229         }
 230
 231         dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
 232         qdev_set_nic_properties(dev, nd);
 233         qdev_init_nofail(dev);
 234     }
 235
 236     /* Create VirtIO disk drives */
 237     for(i = 0; i < MAX_BLK_DEVS; i++) {
 238         DriveInfo *dinfo;
 239         DeviceState *dev;
 240
 241         dinfo = drive_get(IF_IDE, 0, i);
 242         if (!dinfo) {
 243             continue;
 244         }
 245
 246         dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
 247         qdev_prop_set_drive(dev, "drive", dinfo);
 248         qdev_init_nofail(dev);
 249     }
 250 }
 251
 252 static QEMUMachine s390_machine = {
 253     .name = "s390-virtio",
 254     .alias = "s390",
 255     .desc = "VirtIO based S390 machine",
 256     .init = s390_init,
 257     .no_serial = 1,
 258     .no_parallel = 1,
 259     .use_virtcon = 1,
 260     .no_vga = 1,
 261     .max_cpus = 255,
 262     .is_default = 1,
 263 };
 264
 265 static void s390_machine_init(void)
 266 {
 267     qemu_register_machine(&s390_machine);
 268 }
 269
 270 machine_init(s390_machine_init);