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   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright IBM Corp. 2007
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
  19  */
  20
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/kvm_host.h>
  24 #include <linux/module.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/fs.h>
  27 #include <asm/cputable.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/kvm_ppc.h>
  30
  31
  32 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  33 {
  34         return gfn;
  35 }
  36
  37 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  38 {
  39         return !!(v->arch.pending_exceptions);
  40 }
  41
  42 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  43 {
  44         return !(v->arch.msr & MSR_WE);
  45 }
  46
  47
  48 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  49 {
  50         enum emulation_result er;
  51         int r;
  52
  53         er = kvmppc_emulate_instruction(run, vcpu);
  54         switch (er) {
  55         case EMULATE_DONE:
  56                 /* Future optimization: only reload non-volatiles if they were
  57                  * actually modified. */
  58                 r = RESUME_GUEST_NV;
  59                 break;
  60         case EMULATE_DO_MMIO:
  61                 run->exit_reason = KVM_EXIT_MMIO;
  62                 /* We must reload nonvolatiles because "update" load/store
  63                  * instructions modify register state. */
  64                 /* Future optimization: only reload non-volatiles if they were
  65                  * actually modified. */
  66                 r = RESUME_HOST_NV;
  67                 break;
  68         case EMULATE_FAIL:
  69                 /* XXX Deliver Program interrupt to guest. */
  70                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  71                        vcpu->arch.last_inst);
  72                 r = RESUME_HOST;
  73                 break;
  74         default:
  75                 BUG();
  76         }
  77
  78         return r;
  79 }
  80
  81 void kvm_arch_hardware_enable(void *garbage)
  82 {
  83 }
  84
  85 void kvm_arch_hardware_disable(void *garbage)
  86 {
  87 }
  88
  89 int kvm_arch_hardware_setup(void)
  90 {
  91         return 0;
  92 }
  93
  94 void kvm_arch_hardware_unsetup(void)
  95 {
  96 }
  97
  98 void kvm_arch_check_processor_compat(void *rtn)
  99 {
 100         int r;
 101
 102         if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
 103                 r = 0;
 104         else
 105                 r = -ENOTSUPP;
 106
 107         *(int *)rtn = r;
 108 }
 109
 110 struct kvm *kvm_arch_create_vm(void)
 111 {
 112         struct kvm *kvm;
 113
 114         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 115         if (!kvm)
 116                 return ERR_PTR(-ENOMEM);
 117
 118         return kvm;
 119 }
 120
 121 static void kvmppc_free_vcpus(struct kvm *kvm)
 122 {
 123         unsigned int i;
 124
 125         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 126                 if (kvm->vcpus[i]) {
 127                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 128                         kvm->vcpus[i] = NULL;
 129                 }
 130         }
 131 }
 132
 133 void kvm_arch_destroy_vm(struct kvm *kvm)
 134 {
 135         kvmppc_free_vcpus(kvm);
 136         kvm_free_physmem(kvm);
 137         kfree(kvm);
 138 }
 139
 140 int kvm_dev_ioctl_check_extension(long ext)
 141 {
 142         int r;
 143
 144         switch (ext) {
 145         case KVM_CAP_USER_MEMORY:
 146                 r = 1;
 147                 break;
 148         case KVM_CAP_COALESCED_MMIO:
 149                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 150                 break;
 151         default:
 152                 r = 0;
 153                 break;
 154         }
 155         return r;
 156
 157 }
 158
 159 long kvm_arch_dev_ioctl(struct file *filp,
 160                         unsigned int ioctl, unsigned long arg)
 161 {
 162         return -EINVAL;
 163 }
 164
 165 int kvm_arch_set_memory_region(struct kvm *kvm,
 166                                struct kvm_userspace_memory_region *mem,
 167                                struct kvm_memory_slot old,
 168                                int user_alloc)
 169 {
 170         return 0;
 171 }
 172
 173 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 174 {
 175         struct kvm_vcpu *vcpu;
 176         int err;
 177
 178         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 179         if (!vcpu) {
 180                 err = -ENOMEM;
 181                 goto out;
 182         }
 183
 184         err = kvm_vcpu_init(vcpu, kvm, id);
 185         if (err)
 186                 goto free_vcpu;
 187
 188         return vcpu;
 189
 190 free_vcpu:
 191         kmem_cache_free(kvm_vcpu_cache, vcpu);
 192 out:
 193         return ERR_PTR(err);
 194 }
 195
 196 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 197 {
 198         kvm_vcpu_uninit(vcpu);
 199         kmem_cache_free(kvm_vcpu_cache, vcpu);
 200 }
 201
 202 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 203 {
 204         kvm_arch_vcpu_free(vcpu);
 205 }
 206
 207 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 208 {
 209         unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
 210
 211         return test_bit(priority, &vcpu->arch.pending_exceptions);
 212 }
 213
 214 static void kvmppc_decrementer_func(unsigned long data)
 215 {
 216         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 217
 218         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
 219
 220         if (waitqueue_active(&vcpu->wq)) {
 221                 wake_up_interruptible(&vcpu->wq);
 222                 vcpu->stat.halt_wakeup++;
 223         }
 224 }
 225
 226 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 227 {
 228         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 229                     (unsigned long)vcpu);
 230
 231         return 0;
 232 }
 233
 234 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 235 {
 236 }
 237
 238 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 239 {
 240 }
 241
 242 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 243 {
 244 }
 245
 246 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
 247                                     struct kvm_debug_guest *dbg)
 248 {
 249         return -ENOTSUPP;
 250 }
 251
 252 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 253                                      struct kvm_run *run)
 254 {
 255         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 256         *gpr = run->dcr.data;
 257 }
 258
 259 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 260                                       struct kvm_run *run)
 261 {
 262         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 263
 264         if (run->mmio.len > sizeof(*gpr)) {
 265                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 266                 return;
 267         }
 268
 269         if (vcpu->arch.mmio_is_bigendian) {
 270                 switch (run->mmio.len) {
 271                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 272                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 273                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 274                 }
 275         } else {
 276                 /* Convert BE data from userland back to LE. */
 277                 switch (run->mmio.len) {
 278                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 279                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 280                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 281                 }
 282         }
 283 }
 284
 285 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 286                        unsigned int rt, unsigned int bytes, int is_bigendian)
 287 {
 288         if (bytes > sizeof(run->mmio.data)) {
 289                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 290                        run->mmio.len);
 291         }
 292
 293         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 294         run->mmio.len = bytes;
 295         run->mmio.is_write = 0;
 296
 297         vcpu->arch.io_gpr = rt;
 298         vcpu->arch.mmio_is_bigendian = is_bigendian;
 299         vcpu->mmio_needed = 1;
 300         vcpu->mmio_is_write = 0;
 301
 302         return EMULATE_DO_MMIO;
 303 }
 304
 305 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 306                         u32 val, unsigned int bytes, int is_bigendian)
 307 {
 308         void *data = run->mmio.data;
 309
 310         if (bytes > sizeof(run->mmio.data)) {
 311                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 312                        run->mmio.len);
 313         }
 314
 315         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 316         run->mmio.len = bytes;
 317         run->mmio.is_write = 1;
 318         vcpu->mmio_needed = 1;
 319         vcpu->mmio_is_write = 1;
 320
 321         /* Store the value at the lowest bytes in 'data'. */
 322         if (is_bigendian) {
 323                 switch (bytes) {
 324                 case 4: *(u32 *)data = val; break;
 325                 case 2: *(u16 *)data = val; break;
 326                 case 1: *(u8  *)data = val; break;
 327                 }
 328         } else {
 329                 /* Store LE value into 'data'. */
 330                 switch (bytes) {
 331                 case 4: st_le32(data, val); break;
 332                 case 2: st_le16(data, val); break;
 333                 case 1: *(u8 *)data = val; break;
 334                 }
 335         }
 336
 337         return EMULATE_DO_MMIO;
 338 }
 339
 340 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 341 {
 342         int r;
 343         sigset_t sigsaved;
 344
 345         vcpu_load(vcpu);
 346
 347         if (vcpu->sigset_active)
 348                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 349
 350         if (vcpu->mmio_needed) {
 351                 if (!vcpu->mmio_is_write)
 352                         kvmppc_complete_mmio_load(vcpu, run);
 353                 vcpu->mmio_needed = 0;
 354         } else if (vcpu->arch.dcr_needed) {
 355                 if (!vcpu->arch.dcr_is_write)
 356                         kvmppc_complete_dcr_load(vcpu, run);
 357                 vcpu->arch.dcr_needed = 0;
 358         }
 359
 360         kvmppc_check_and_deliver_interrupts(vcpu);
 361
 362         local_irq_disable();
 363         kvm_guest_enter();
 364         r = __kvmppc_vcpu_run(run, vcpu);
 365         kvm_guest_exit();
 366         local_irq_enable();
 367
 368         if (vcpu->sigset_active)
 369                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 370
 371         vcpu_put(vcpu);
 372
 373         return r;
 374 }
 375
 376 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 377 {
 378         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
 379
 380         if (waitqueue_active(&vcpu->wq)) {
 381                 wake_up_interruptible(&vcpu->wq);
 382                 vcpu->stat.halt_wakeup++;
 383         }
 384
 385         return 0;
 386 }
 387
 388 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 389                                     struct kvm_mp_state *mp_state)
 390 {
 391         return -EINVAL;
 392 }
 393
 394 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 395                                     struct kvm_mp_state *mp_state)
 396 {
 397         return -EINVAL;
 398 }
 399
 400 long kvm_arch_vcpu_ioctl(struct file *filp,
 401                          unsigned int ioctl, unsigned long arg)
 402 {
 403         struct kvm_vcpu *vcpu = filp->private_data;
 404         void __user *argp = (void __user *)arg;
 405         long r;
 406
 407         switch (ioctl) {
 408         case KVM_INTERRUPT: {
 409                 struct kvm_interrupt irq;
 410                 r = -EFAULT;
 411                 if (copy_from_user(&irq, argp, sizeof(irq)))
 412                         goto out;
 413                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 414                 break;
 415         }
 416         default:
 417                 r = -EINVAL;
 418         }
 419
 420 out:
 421         return r;
 422 }
 423
 424 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 425 {
 426         return -ENOTSUPP;
 427 }
 428
 429 long kvm_arch_vm_ioctl(struct file *filp,
 430                        unsigned int ioctl, unsigned long arg)
 431 {
 432         long r;
 433
 434         switch (ioctl) {
 435         default:
 436                 r = -EINVAL;
 437         }
 438
 439         return r;
 440 }
 441
 442 int kvm_arch_init(void *opaque)
 443 {
 444         return 0;
 445 }
 446
 447 void kvm_arch_exit(void)
 448 {
 449 }