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         default:
 149                 r = 0;
 150                 break;
 151         }
 152         return r;
 153
 154 }
 155
 156 long kvm_arch_dev_ioctl(struct file *filp,
 157                         unsigned int ioctl, unsigned long arg)
 158 {
 159         return -EINVAL;
 160 }
 161
 162 int kvm_arch_set_memory_region(struct kvm *kvm,
 163                                struct kvm_userspace_memory_region *mem,
 164                                struct kvm_memory_slot old,
 165                                int user_alloc)
 166 {
 167         return 0;
 168 }
 169
 170 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 171 {
 172         struct kvm_vcpu *vcpu;
 173         int err;
 174
 175         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 176         if (!vcpu) {
 177                 err = -ENOMEM;
 178                 goto out;
 179         }
 180
 181         err = kvm_vcpu_init(vcpu, kvm, id);
 182         if (err)
 183                 goto free_vcpu;
 184
 185         return vcpu;
 186
 187 free_vcpu:
 188         kmem_cache_free(kvm_vcpu_cache, vcpu);
 189 out:
 190         return ERR_PTR(err);
 191 }
 192
 193 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 194 {
 195         kvm_vcpu_uninit(vcpu);
 196         kmem_cache_free(kvm_vcpu_cache, vcpu);
 197 }
 198
 199 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 200 {
 201         kvm_arch_vcpu_free(vcpu);
 202 }
 203
 204 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 205 {
 206         unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
 207
 208         return test_bit(priority, &vcpu->arch.pending_exceptions);
 209 }
 210
 211 static void kvmppc_decrementer_func(unsigned long data)
 212 {
 213         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 214
 215         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
 216
 217         if (waitqueue_active(&vcpu->wq)) {
 218                 wake_up_interruptible(&vcpu->wq);
 219                 vcpu->stat.halt_wakeup++;
 220         }
 221 }
 222
 223 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 224 {
 225         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 226                     (unsigned long)vcpu);
 227
 228         return 0;
 229 }
 230
 231 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 232 {
 233 }
 234
 235 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 236 {
 237 }
 238
 239 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 240 {
 241 }
 242
 243 void decache_vcpus_on_cpu(int cpu)
 244 {
 245 }
 246
 247 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
 248                                     struct kvm_debug_guest *dbg)
 249 {
 250         return -ENOTSUPP;
 251 }
 252
 253 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 254                                      struct kvm_run *run)
 255 {
 256         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 257         *gpr = run->dcr.data;
 258 }
 259
 260 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 261                                       struct kvm_run *run)
 262 {
 263         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 264
 265         if (run->mmio.len > sizeof(*gpr)) {
 266                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 267                 return;
 268         }
 269
 270         if (vcpu->arch.mmio_is_bigendian) {
 271                 switch (run->mmio.len) {
 272                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 273                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 274                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 275                 }
 276         } else {
 277                 /* Convert BE data from userland back to LE. */
 278                 switch (run->mmio.len) {
 279                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 280                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 281                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 282                 }
 283         }
 284 }
 285
 286 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 287                        unsigned int rt, unsigned int bytes, int is_bigendian)
 288 {
 289         if (bytes > sizeof(run->mmio.data)) {
 290                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 291                        run->mmio.len);
 292         }
 293
 294         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 295         run->mmio.len = bytes;
 296         run->mmio.is_write = 0;
 297
 298         vcpu->arch.io_gpr = rt;
 299         vcpu->arch.mmio_is_bigendian = is_bigendian;
 300         vcpu->mmio_needed = 1;
 301         vcpu->mmio_is_write = 0;
 302
 303         return EMULATE_DO_MMIO;
 304 }
 305
 306 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 307                         u32 val, unsigned int bytes, int is_bigendian)
 308 {
 309         void *data = run->mmio.data;
 310
 311         if (bytes > sizeof(run->mmio.data)) {
 312                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 313                        run->mmio.len);
 314         }
 315
 316         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 317         run->mmio.len = bytes;
 318         run->mmio.is_write = 1;
 319         vcpu->mmio_needed = 1;
 320         vcpu->mmio_is_write = 1;
 321
 322         /* Store the value at the lowest bytes in 'data'. */
 323         if (is_bigendian) {
 324                 switch (bytes) {
 325                 case 4: *(u32 *)data = val; break;
 326                 case 2: *(u16 *)data = val; break;
 327                 case 1: *(u8  *)data = val; break;
 328                 }
 329         } else {
 330                 /* Store LE value into 'data'. */
 331                 switch (bytes) {
 332                 case 4: st_le32(data, val); break;
 333                 case 2: st_le16(data, val); break;
 334                 case 1: *(u8 *)data = val; break;
 335                 }
 336         }
 337
 338         return EMULATE_DO_MMIO;
 339 }
 340
 341 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 342 {
 343         int r;
 344         sigset_t sigsaved;
 345
 346         vcpu_load(vcpu);
 347
 348         if (vcpu->sigset_active)
 349                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 350
 351         if (vcpu->mmio_needed) {
 352                 if (!vcpu->mmio_is_write)
 353                         kvmppc_complete_mmio_load(vcpu, run);
 354                 vcpu->mmio_needed = 0;
 355         } else if (vcpu->arch.dcr_needed) {
 356                 if (!vcpu->arch.dcr_is_write)
 357                         kvmppc_complete_dcr_load(vcpu, run);
 358                 vcpu->arch.dcr_needed = 0;
 359         }
 360
 361         kvmppc_check_and_deliver_interrupts(vcpu);
 362
 363         local_irq_disable();
 364         kvm_guest_enter();
 365         r = __kvmppc_vcpu_run(run, vcpu);
 366         kvm_guest_exit();
 367         local_irq_enable();
 368
 369         if (vcpu->sigset_active)
 370                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 371
 372         vcpu_put(vcpu);
 373
 374         return r;
 375 }
 376
 377 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 378 {
 379         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
 380
 381         if (waitqueue_active(&vcpu->wq)) {
 382                 wake_up_interruptible(&vcpu->wq);
 383                 vcpu->stat.halt_wakeup++;
 384         }
 385
 386         return 0;
 387 }
 388
 389 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 390                                     struct kvm_mp_state *mp_state)
 391 {
 392         return -EINVAL;
 393 }
 394
 395 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 396                                     struct kvm_mp_state *mp_state)
 397 {
 398         return -EINVAL;
 399 }
 400
 401 long kvm_arch_vcpu_ioctl(struct file *filp,
 402                          unsigned int ioctl, unsigned long arg)
 403 {
 404         struct kvm_vcpu *vcpu = filp->private_data;
 405         void __user *argp = (void __user *)arg;
 406         long r;
 407
 408         switch (ioctl) {
 409         case KVM_INTERRUPT: {
 410                 struct kvm_interrupt irq;
 411                 r = -EFAULT;
 412                 if (copy_from_user(&irq, argp, sizeof(irq)))
 413                         goto out;
 414                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 415                 break;
 416         }
 417         default:
 418                 r = -EINVAL;
 419         }
 420
 421 out:
 422         return r;
 423 }
 424
 425 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 426 {
 427         return -ENOTSUPP;
 428 }
 429
 430 long kvm_arch_vm_ioctl(struct file *filp,
 431                        unsigned int ioctl, unsigned long arg)
 432 {
 433         long r;
 434
 435         switch (ioctl) {
 436         default:
 437                 r = -EINVAL;
 438         }
 439
 440         return r;
 441 }
 442
 443 int kvm_arch_init(void *opaque)
 444 {
 445         return 0;
 446 }
 447
 448 void kvm_arch_exit(void)
 449 {
 450 }