err.no Git - linux-2.6/blob - 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         /* XXX implement me */
  40         return 0;
  41 }
  42
  43 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  44 {
  45         return 1;
  46 }
  47
  48
  49 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  50 {
  51         enum emulation_result er;
  52         int r;
  53
  54         er = kvmppc_emulate_instruction(run, vcpu);
  55         switch (er) {
  56         case EMULATE_DONE:
  57                 /* Future optimization: only reload non-volatiles if they were
  58                  * actually modified. */
  59                 r = RESUME_GUEST_NV;
  60                 break;
  61         case EMULATE_DO_MMIO:
  62                 run->exit_reason = KVM_EXIT_MMIO;
  63                 /* We must reload nonvolatiles because "update" load/store
  64                  * instructions modify register state. */
  65                 /* Future optimization: only reload non-volatiles if they were
  66                  * actually modified. */
  67                 r = RESUME_HOST_NV;
  68                 break;
  69         case EMULATE_FAIL:
  70                 /* XXX Deliver Program interrupt to guest. */
  71                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  72                        vcpu->arch.last_inst);
  73                 r = RESUME_HOST;
  74                 break;
  75         default:
  76                 BUG();
  77         }
  78
  79         return r;
  80 }
  81
  82 void kvm_arch_hardware_enable(void *garbage)
  83 {
  84 }
  85
  86 void kvm_arch_hardware_disable(void *garbage)
  87 {
  88 }
  89
  90 int kvm_arch_hardware_setup(void)
  91 {
  92         return 0;
  93 }
  94
  95 void kvm_arch_hardware_unsetup(void)
  96 {
  97 }
  98
  99 void kvm_arch_check_processor_compat(void *rtn)
 100 {
 101         int r;
 102
 103         if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
 104                 r = 0;
 105         else
 106                 r = -ENOTSUPP;
 107
 108         *(int *)rtn = r;
 109 }
 110
 111 struct kvm *kvm_arch_create_vm(void)
 112 {
 113         struct kvm *kvm;
 114
 115         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 116         if (!kvm)
 117                 return ERR_PTR(-ENOMEM);
 118
 119         return kvm;
 120 }
 121
 122 static void kvmppc_free_vcpus(struct kvm *kvm)
 123 {
 124         unsigned int i;
 125
 126         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 127                 if (kvm->vcpus[i]) {
 128                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 129                         kvm->vcpus[i] = NULL;
 130                 }
 131         }
 132 }
 133
 134 void kvm_arch_destroy_vm(struct kvm *kvm)
 135 {
 136         kvmppc_free_vcpus(kvm);
 137         kvm_free_physmem(kvm);
 138         kfree(kvm);
 139 }
 140
 141 int kvm_dev_ioctl_check_extension(long ext)
 142 {
 143         int r;
 144
 145         switch (ext) {
 146         case KVM_CAP_USER_MEMORY:
 147                 r = 1;
 148                 break;
 149         default:
 150                 r = 0;
 151                 break;
 152         }
 153         return r;
 154
 155 }
 156
 157 long kvm_arch_dev_ioctl(struct file *filp,
 158                         unsigned int ioctl, unsigned long arg)
 159 {
 160         return -EINVAL;
 161 }
 162
 163 int kvm_arch_set_memory_region(struct kvm *kvm,
 164                                struct kvm_userspace_memory_region *mem,
 165                                struct kvm_memory_slot old,
 166                                int user_alloc)
 167 {
 168         return 0;
 169 }
 170
 171 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 172 {
 173         struct kvm_vcpu *vcpu;
 174         int err;
 175
 176         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 177         if (!vcpu) {
 178                 err = -ENOMEM;
 179                 goto out;
 180         }
 181
 182         err = kvm_vcpu_init(vcpu, kvm, id);
 183         if (err)
 184                 goto free_vcpu;
 185
 186         return vcpu;
 187
 188 free_vcpu:
 189         kmem_cache_free(kvm_vcpu_cache, vcpu);
 190 out:
 191         return ERR_PTR(err);
 192 }
 193
 194 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 195 {
 196         kvm_vcpu_uninit(vcpu);
 197         kmem_cache_free(kvm_vcpu_cache, vcpu);
 198 }
 199
 200 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 201 {
 202         kvm_arch_vcpu_free(vcpu);
 203 }
 204
 205 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 206 {
 207         unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
 208
 209         return test_bit(priority, &vcpu->arch.pending_exceptions);
 210 }
 211
 212 static void kvmppc_decrementer_func(unsigned long data)
 213 {
 214         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 215
 216         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
 217 }
 218
 219 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 220 {
 221         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 222                     (unsigned long)vcpu);
 223
 224         return 0;
 225 }
 226
 227 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 228 {
 229 }
 230
 231 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 232 {
 233 }
 234
 235 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 236 {
 237 }
 238
 239 void decache_vcpus_on_cpu(int cpu)
 240 {
 241 }
 242
 243 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
 244                                     struct kvm_debug_guest *dbg)
 245 {
 246         return -ENOTSUPP;
 247 }
 248
 249 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 250                                      struct kvm_run *run)
 251 {
 252         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 253         *gpr = run->dcr.data;
 254 }
 255
 256 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 257                                       struct kvm_run *run)
 258 {
 259         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 260
 261         if (run->mmio.len > sizeof(*gpr)) {
 262                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 263                 return;
 264         }
 265
 266         if (vcpu->arch.mmio_is_bigendian) {
 267                 switch (run->mmio.len) {
 268                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 269                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 270                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 271                 }
 272         } else {
 273                 /* Convert BE data from userland back to LE. */
 274                 switch (run->mmio.len) {
 275                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 276                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 277                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 278                 }
 279         }
 280 }
 281
 282 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 283                        unsigned int rt, unsigned int bytes, int is_bigendian)
 284 {
 285         if (bytes > sizeof(run->mmio.data)) {
 286                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 287                        run->mmio.len);
 288         }
 289
 290         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 291         run->mmio.len = bytes;
 292         run->mmio.is_write = 0;
 293
 294         vcpu->arch.io_gpr = rt;
 295         vcpu->arch.mmio_is_bigendian = is_bigendian;
 296         vcpu->mmio_needed = 1;
 297         vcpu->mmio_is_write = 0;
 298
 299         return EMULATE_DO_MMIO;
 300 }
 301
 302 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 303                         u32 val, unsigned int bytes, int is_bigendian)
 304 {
 305         void *data = run->mmio.data;
 306
 307         if (bytes > sizeof(run->mmio.data)) {
 308                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 309                        run->mmio.len);
 310         }
 311
 312         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 313         run->mmio.len = bytes;
 314         run->mmio.is_write = 1;
 315         vcpu->mmio_needed = 1;
 316         vcpu->mmio_is_write = 1;
 317
 318         /* Store the value at the lowest bytes in 'data'. */
 319         if (is_bigendian) {
 320                 switch (bytes) {
 321                 case 4: *(u32 *)data = val; break;
 322                 case 2: *(u16 *)data = val; break;
 323                 case 1: *(u8  *)data = val; break;
 324                 }
 325         } else {
 326                 /* Store LE value into 'data'. */
 327                 switch (bytes) {
 328                 case 4: st_le32(data, val); break;
 329                 case 2: st_le16(data, val); break;
 330                 case 1: *(u8 *)data = val; break;
 331                 }
 332         }
 333
 334         return EMULATE_DO_MMIO;
 335 }
 336
 337 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 338 {
 339         int r;
 340         sigset_t sigsaved;
 341
 342         if (vcpu->sigset_active)
 343                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 344
 345         if (vcpu->mmio_needed) {
 346                 if (!vcpu->mmio_is_write)
 347                         kvmppc_complete_mmio_load(vcpu, run);
 348                 vcpu->mmio_needed = 0;
 349         } else if (vcpu->arch.dcr_needed) {
 350                 if (!vcpu->arch.dcr_is_write)
 351                         kvmppc_complete_dcr_load(vcpu, run);
 352                 vcpu->arch.dcr_needed = 0;
 353         }
 354
 355         kvmppc_check_and_deliver_interrupts(vcpu);
 356
 357         local_irq_disable();
 358         kvm_guest_enter();
 359         r = __kvmppc_vcpu_run(run, vcpu);
 360         kvm_guest_exit();
 361         local_irq_enable();
 362
 363         if (vcpu->sigset_active)
 364                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 365
 366         return r;
 367 }
 368
 369 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 370 {
 371         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
 372         return 0;
 373 }
 374
 375 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 376                                     struct kvm_mp_state *mp_state)
 377 {
 378         return -EINVAL;
 379 }
 380
 381 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 382                                     struct kvm_mp_state *mp_state)
 383 {
 384         return -EINVAL;
 385 }
 386
 387 long kvm_arch_vcpu_ioctl(struct file *filp,
 388                          unsigned int ioctl, unsigned long arg)
 389 {
 390         struct kvm_vcpu *vcpu = filp->private_data;
 391         void __user *argp = (void __user *)arg;
 392         long r;
 393
 394         switch (ioctl) {
 395         case KVM_INTERRUPT: {
 396                 struct kvm_interrupt irq;
 397                 r = -EFAULT;
 398                 if (copy_from_user(&irq, argp, sizeof(irq)))
 399                         goto out;
 400                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 401                 break;
 402         }
 403         default:
 404                 r = -EINVAL;
 405         }
 406
 407 out:
 408         return r;
 409 }
 410
 411 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 412 {
 413         return -ENOTSUPP;
 414 }
 415
 416 long kvm_arch_vm_ioctl(struct file *filp,
 417                        unsigned int ioctl, unsigned long arg)
 418 {
 419         long r;
 420
 421         switch (ioctl) {
 422         default:
 423                 r = -EINVAL;
 424         }
 425
 426         return r;
 427 }
 428
 429 int kvm_arch_init(void *opaque)
 430 {
 431         return 0;
 432 }
 433
 434 void kvm_arch_exit(void)
 435 {
 436 }