arch/powerpc/kvm/powerpc.c

   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 void kvm_arch_flush_shadow(struct kvm *kvm)
 174 {
 175 }
 176
 177 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 178 {
 179         struct kvm_vcpu *vcpu;
 180         int err;
 181
 182         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 183         if (!vcpu) {
 184                 err = -ENOMEM;
 185                 goto out;
 186         }
 187
 188         err = kvm_vcpu_init(vcpu, kvm, id);
 189         if (err)
 190                 goto free_vcpu;
 191
 192         return vcpu;
 193
 194 free_vcpu:
 195         kmem_cache_free(kvm_vcpu_cache, vcpu);
 196 out:
 197         return ERR_PTR(err);
 198 }
 199
 200 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 201 {
 202         kvm_vcpu_uninit(vcpu);
 203         kmem_cache_free(kvm_vcpu_cache, vcpu);
 204 }
 205
 206 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 207 {
 208         kvm_arch_vcpu_free(vcpu);
 209 }
 210
 211 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 212 {
 213         unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
 214
 215         return test_bit(priority, &vcpu->arch.pending_exceptions);
 216 }
 217
 218 static void kvmppc_decrementer_func(unsigned long data)
 219 {
 220         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 221
 222         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
 223
 224         if (waitqueue_active(&vcpu->wq)) {
 225                 wake_up_interruptible(&vcpu->wq);
 226                 vcpu->stat.halt_wakeup++;
 227         }
 228 }
 229
 230 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 231 {
 232         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 233                     (unsigned long)vcpu);
 234
 235         return 0;
 236 }
 237
 238 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 239 {
 240 }
 241
 242 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 243 {
 244 }
 245
 246 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 247 {
 248 }
 249
 250 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
 251                                     struct kvm_debug_guest *dbg)
 252 {
 253         return -ENOTSUPP;
 254 }
 255
 256 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 257                                      struct kvm_run *run)
 258 {
 259         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 260         *gpr = run->dcr.data;
 261 }
 262
 263 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 264                                       struct kvm_run *run)
 265 {
 266         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 267
 268         if (run->mmio.len > sizeof(*gpr)) {
 269                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 270                 return;
 271         }
 272
 273         if (vcpu->arch.mmio_is_bigendian) {
 274                 switch (run->mmio.len) {
 275                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 276                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 277                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 278                 }
 279         } else {
 280                 /* Convert BE data from userland back to LE. */
 281                 switch (run->mmio.len) {
 282                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 283                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 284                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 285                 }
 286         }
 287 }
 288
 289 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 290                        unsigned int rt, unsigned int bytes, int is_bigendian)
 291 {
 292         if (bytes > sizeof(run->mmio.data)) {
 293                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 294                        run->mmio.len);
 295         }
 296
 297         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 298         run->mmio.len = bytes;
 299         run->mmio.is_write = 0;
 300
 301         vcpu->arch.io_gpr = rt;
 302         vcpu->arch.mmio_is_bigendian = is_bigendian;
 303         vcpu->mmio_needed = 1;
 304         vcpu->mmio_is_write = 0;
 305
 306         return EMULATE_DO_MMIO;
 307 }
 308
 309 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 310                         u32 val, unsigned int bytes, int is_bigendian)
 311 {
 312         void *data = run->mmio.data;
 313
 314         if (bytes > sizeof(run->mmio.data)) {
 315                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 316                        run->mmio.len);
 317         }
 318
 319         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 320         run->mmio.len = bytes;
 321         run->mmio.is_write = 1;
 322         vcpu->mmio_needed = 1;
 323         vcpu->mmio_is_write = 1;
 324
 325         /* Store the value at the lowest bytes in 'data'. */
 326         if (is_bigendian) {
 327                 switch (bytes) {
 328                 case 4: *(u32 *)data = val; break;
 329                 case 2: *(u16 *)data = val; break;
 330                 case 1: *(u8  *)data = val; break;
 331                 }
 332         } else {
 333                 /* Store LE value into 'data'. */
 334                 switch (bytes) {
 335                 case 4: st_le32(data, val); break;
 336                 case 2: st_le16(data, val); break;
 337                 case 1: *(u8 *)data = val; break;
 338                 }
 339         }
 340
 341         return EMULATE_DO_MMIO;
 342 }
 343
 344 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 345 {
 346         int r;
 347         sigset_t sigsaved;
 348
 349         vcpu_load(vcpu);
 350
 351         if (vcpu->sigset_active)
 352                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 353
 354         if (vcpu->mmio_needed) {
 355                 if (!vcpu->mmio_is_write)
 356                         kvmppc_complete_mmio_load(vcpu, run);
 357                 vcpu->mmio_needed = 0;
 358         } else if (vcpu->arch.dcr_needed) {
 359                 if (!vcpu->arch.dcr_is_write)
 360                         kvmppc_complete_dcr_load(vcpu, run);
 361                 vcpu->arch.dcr_needed = 0;
 362         }
 363
 364         kvmppc_check_and_deliver_interrupts(vcpu);
 365
 366         local_irq_disable();
 367         kvm_guest_enter();
 368         r = __kvmppc_vcpu_run(run, vcpu);
 369         kvm_guest_exit();
 370         local_irq_enable();
 371
 372         if (vcpu->sigset_active)
 373                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 374
 375         vcpu_put(vcpu);
 376
 377         return r;
 378 }
 379
 380 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 381 {
 382         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
 383
 384         if (waitqueue_active(&vcpu->wq)) {
 385                 wake_up_interruptible(&vcpu->wq);
 386                 vcpu->stat.halt_wakeup++;
 387         }
 388
 389         return 0;
 390 }
 391
 392 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 393                                     struct kvm_mp_state *mp_state)
 394 {
 395         return -EINVAL;
 396 }
 397
 398 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 399                                     struct kvm_mp_state *mp_state)
 400 {
 401         return -EINVAL;
 402 }
 403
 404 long kvm_arch_vcpu_ioctl(struct file *filp,
 405                          unsigned int ioctl, unsigned long arg)
 406 {
 407         struct kvm_vcpu *vcpu = filp->private_data;
 408         void __user *argp = (void __user *)arg;
 409         long r;
 410
 411         switch (ioctl) {
 412         case KVM_INTERRUPT: {
 413                 struct kvm_interrupt irq;
 414                 r = -EFAULT;
 415                 if (copy_from_user(&irq, argp, sizeof(irq)))
 416                         goto out;
 417                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 418                 break;
 419         }
 420         default:
 421                 r = -EINVAL;
 422         }
 423
 424 out:
 425         return r;
 426 }
 427
 428 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 429 {
 430         return -ENOTSUPP;
 431 }
 432
 433 long kvm_arch_vm_ioctl(struct file *filp,
 434                        unsigned int ioctl, unsigned long arg)
 435 {
 436         long r;
 437
 438         switch (ioctl) {
 439         default:
 440                 r = -EINVAL;
 441         }
 442
 443         return r;
 444 }
 445
 446 int kvm_arch_init(void *opaque)
 447 {
 448         return 0;
 449 }
 450
 451 void kvm_arch_exit(void)
 452 {
 453 }