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/hrtimer.h>
  27 #include <linux/fs.h>
  28 #include <linux/slab.h>
  29 #include <asm/cputable.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/kvm_ppc.h>
  32 #include <asm/tlbflush.h>
  33 #include "timing.h"
  34 #include "../mm/mmu_decl.h"
  35
  36 #define CREATE_TRACE_POINTS
  37 #include "trace.h"
  38
  39 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  40 {
  41         return gfn;
  42 }
  43
  44 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  45 {
  46         return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
  47 }
  48
  49
  50 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  51 {
  52         enum emulation_result er;
  53         int r;
  54
  55         er = kvmppc_emulate_instruction(run, vcpu);
  56         switch (er) {
  57         case EMULATE_DONE:
  58                 /* Future optimization: only reload non-volatiles if they were
  59                  * actually modified. */
  60                 r = RESUME_GUEST_NV;
  61                 break;
  62         case EMULATE_DO_MMIO:
  63                 run->exit_reason = KVM_EXIT_MMIO;
  64                 /* We must reload nonvolatiles because "update" load/store
  65                  * instructions modify register state. */
  66                 /* Future optimization: only reload non-volatiles if they were
  67                  * actually modified. */
  68                 r = RESUME_HOST_NV;
  69                 break;
  70         case EMULATE_FAIL:
  71                 /* XXX Deliver Program interrupt to guest. */
  72                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  73                        kvmppc_get_last_inst(vcpu));
  74                 r = RESUME_HOST;
  75                 break;
  76         default:
  77                 BUG();
  78         }
  79
  80         return r;
  81 }
  82
  83 int kvm_arch_hardware_enable(void *garbage)
  84 {
  85         return 0;
  86 }
  87
  88 void kvm_arch_hardware_disable(void *garbage)
  89 {
  90 }
  91
  92 int kvm_arch_hardware_setup(void)
  93 {
  94         return 0;
  95 }
  96
  97 void kvm_arch_hardware_unsetup(void)
  98 {
  99 }
 100
 101 void kvm_arch_check_processor_compat(void *rtn)
 102 {
 103         *(int *)rtn = kvmppc_core_check_processor_compat();
 104 }
 105
 106 struct kvm *kvm_arch_create_vm(void)
 107 {
 108         struct kvm *kvm;
 109
 110         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 111         if (!kvm)
 112                 return ERR_PTR(-ENOMEM);
 113
 114         return kvm;
 115 }
 116
 117 static void kvmppc_free_vcpus(struct kvm *kvm)
 118 {
 119         unsigned int i;
 120         struct kvm_vcpu *vcpu;
 121
 122         kvm_for_each_vcpu(i, vcpu, kvm)
 123                 kvm_arch_vcpu_free(vcpu);
 124
 125         mutex_lock(&kvm->lock);
 126         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 127                 kvm->vcpus[i] = NULL;
 128
 129         atomic_set(&kvm->online_vcpus, 0);
 130         mutex_unlock(&kvm->lock);
 131 }
 132
 133 void kvm_arch_sync_events(struct kvm *kvm)
 134 {
 135 }
 136
 137 void kvm_arch_destroy_vm(struct kvm *kvm)
 138 {
 139         kvmppc_free_vcpus(kvm);
 140         kvm_free_physmem(kvm);
 141         cleanup_srcu_struct(&kvm->srcu);
 142         kfree(kvm);
 143 }
 144
 145 int kvm_dev_ioctl_check_extension(long ext)
 146 {
 147         int r;
 148
 149         switch (ext) {
 150         case KVM_CAP_PPC_SEGSTATE:
 151         case KVM_CAP_PPC_PAIRED_SINGLES:
 152         case KVM_CAP_PPC_UNSET_IRQ:
 153         case KVM_CAP_ENABLE_CAP:
 154         case KVM_CAP_PPC_OSI:
 155                 r = 1;
 156                 break;
 157         case KVM_CAP_COALESCED_MMIO:
 158                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 159                 break;
 160         default:
 161                 r = 0;
 162                 break;
 163         }
 164         return r;
 165
 166 }
 167
 168 long kvm_arch_dev_ioctl(struct file *filp,
 169                         unsigned int ioctl, unsigned long arg)
 170 {
 171         return -EINVAL;
 172 }
 173
 174 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 175                                    struct kvm_memory_slot *memslot,
 176                                    struct kvm_memory_slot old,
 177                                    struct kvm_userspace_memory_region *mem,
 178                                    int user_alloc)
 179 {
 180         return 0;
 181 }
 182
 183 void kvm_arch_commit_memory_region(struct kvm *kvm,
 184                struct kvm_userspace_memory_region *mem,
 185                struct kvm_memory_slot old,
 186                int user_alloc)
 187 {
 188        return;
 189 }
 190
 191
 192 void kvm_arch_flush_shadow(struct kvm *kvm)
 193 {
 194 }
 195
 196 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 197 {
 198         struct kvm_vcpu *vcpu;
 199         vcpu = kvmppc_core_vcpu_create(kvm, id);
 200         if (!IS_ERR(vcpu))
 201                 kvmppc_create_vcpu_debugfs(vcpu, id);
 202         return vcpu;
 203 }
 204
 205 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 206 {
 207         /* Make sure we're not using the vcpu anymore */
 208         hrtimer_cancel(&vcpu->arch.dec_timer);
 209         tasklet_kill(&vcpu->arch.tasklet);
 210
 211         kvmppc_remove_vcpu_debugfs(vcpu);
 212         kvmppc_core_vcpu_free(vcpu);
 213 }
 214
 215 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 216 {
 217         kvm_arch_vcpu_free(vcpu);
 218 }
 219
 220 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 221 {
 222         return kvmppc_core_pending_dec(vcpu);
 223 }
 224
 225 static void kvmppc_decrementer_func(unsigned long data)
 226 {
 227         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 228
 229         kvmppc_core_queue_dec(vcpu);
 230
 231         if (waitqueue_active(&vcpu->wq)) {
 232                 wake_up_interruptible(&vcpu->wq);
 233                 vcpu->stat.halt_wakeup++;
 234         }
 235 }
 236
 237 /*
 238  * low level hrtimer wake routine. Because this runs in hardirq context
 239  * we schedule a tasklet to do the real work.
 240  */
 241 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 242 {
 243         struct kvm_vcpu *vcpu;
 244
 245         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 246         tasklet_schedule(&vcpu->arch.tasklet);
 247
 248         return HRTIMER_NORESTART;
 249 }
 250
 251 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 252 {
 253         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 254         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 255         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 256
 257         return 0;
 258 }
 259
 260 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 261 {
 262         kvmppc_mmu_destroy(vcpu);
 263 }
 264
 265 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 266 {
 267         kvmppc_core_vcpu_load(vcpu, cpu);
 268 }
 269
 270 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 271 {
 272         kvmppc_core_vcpu_put(vcpu);
 273 }
 274
 275 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 276                                         struct kvm_guest_debug *dbg)
 277 {
 278         return -EINVAL;
 279 }
 280
 281 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 282                                      struct kvm_run *run)
 283 {
 284         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 285 }
 286
 287 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 288                                       struct kvm_run *run)
 289 {
 290         u64 gpr;
 291
 292         if (run->mmio.len > sizeof(gpr)) {
 293                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 294                 return;
 295         }
 296
 297         if (vcpu->arch.mmio_is_bigendian) {
 298                 switch (run->mmio.len) {
 299                 case 8: gpr = *(u64 *)run->mmio.data; break;
 300                 case 4: gpr = *(u32 *)run->mmio.data; break;
 301                 case 2: gpr = *(u16 *)run->mmio.data; break;
 302                 case 1: gpr = *(u8 *)run->mmio.data; break;
 303                 }
 304         } else {
 305                 /* Convert BE data from userland back to LE. */
 306                 switch (run->mmio.len) {
 307                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 308                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 309                 case 1: gpr = *(u8 *)run->mmio.data; break;
 310                 }
 311         }
 312
 313         if (vcpu->arch.mmio_sign_extend) {
 314                 switch (run->mmio.len) {
 315 #ifdef CONFIG_PPC64
 316                 case 4:
 317                         gpr = (s64)(s32)gpr;
 318                         break;
 319 #endif
 320                 case 2:
 321                         gpr = (s64)(s16)gpr;
 322                         break;
 323                 case 1:
 324                         gpr = (s64)(s8)gpr;
 325                         break;
 326                 }
 327         }
 328
 329         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 330
 331         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
 332         case KVM_REG_GPR:
 333                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 334                 break;
 335         case KVM_REG_FPR:
 336                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 337                 break;
 338 #ifdef CONFIG_PPC_BOOK3S
 339         case KVM_REG_QPR:
 340                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 341                 break;
 342         case KVM_REG_FQPR:
 343                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 344                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 345                 break;
 346 #endif
 347         default:
 348                 BUG();
 349         }
 350 }
 351
 352 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 353                        unsigned int rt, unsigned int bytes, int is_bigendian)
 354 {
 355         if (bytes > sizeof(run->mmio.data)) {
 356                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 357                        run->mmio.len);
 358         }
 359
 360         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 361         run->mmio.len = bytes;
 362         run->mmio.is_write = 0;
 363
 364         vcpu->arch.io_gpr = rt;
 365         vcpu->arch.mmio_is_bigendian = is_bigendian;
 366         vcpu->mmio_needed = 1;
 367         vcpu->mmio_is_write = 0;
 368         vcpu->arch.mmio_sign_extend = 0;
 369
 370         return EMULATE_DO_MMIO;
 371 }
 372
 373 /* Same as above, but sign extends */
 374 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 375                         unsigned int rt, unsigned int bytes, int is_bigendian)
 376 {
 377         int r;
 378
 379         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 380         vcpu->arch.mmio_sign_extend = 1;
 381
 382         return r;
 383 }
 384
 385 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 386                         u64 val, unsigned int bytes, int is_bigendian)
 387 {
 388         void *data = run->mmio.data;
 389
 390         if (bytes > sizeof(run->mmio.data)) {
 391                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 392                        run->mmio.len);
 393         }
 394
 395         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 396         run->mmio.len = bytes;
 397         run->mmio.is_write = 1;
 398         vcpu->mmio_needed = 1;
 399         vcpu->mmio_is_write = 1;
 400
 401         /* Store the value at the lowest bytes in 'data'. */
 402         if (is_bigendian) {
 403                 switch (bytes) {
 404                 case 8: *(u64 *)data = val; break;
 405                 case 4: *(u32 *)data = val; break;
 406                 case 2: *(u16 *)data = val; break;
 407                 case 1: *(u8  *)data = val; break;
 408                 }
 409         } else {
 410                 /* Store LE value into 'data'. */
 411                 switch (bytes) {
 412                 case 4: st_le32(data, val); break;
 413                 case 2: st_le16(data, val); break;
 414                 case 1: *(u8 *)data = val; break;
 415                 }
 416         }
 417
 418         return EMULATE_DO_MMIO;
 419 }
 420
 421 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 422 {
 423         int r;
 424         sigset_t sigsaved;
 425
 426         vcpu_load(vcpu);
 427
 428         if (vcpu->sigset_active)
 429                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 430
 431         if (vcpu->mmio_needed) {
 432                 if (!vcpu->mmio_is_write)
 433                         kvmppc_complete_mmio_load(vcpu, run);
 434                 vcpu->mmio_needed = 0;
 435         } else if (vcpu->arch.dcr_needed) {
 436                 if (!vcpu->arch.dcr_is_write)
 437                         kvmppc_complete_dcr_load(vcpu, run);
 438                 vcpu->arch.dcr_needed = 0;
 439         } else if (vcpu->arch.osi_needed) {
 440                 u64 *gprs = run->osi.gprs;
 441                 int i;
 442
 443                 for (i = 0; i < 32; i++)
 444                         kvmppc_set_gpr(vcpu, i, gprs[i]);
 445                 vcpu->arch.osi_needed = 0;
 446         }
 447
 448         kvmppc_core_deliver_interrupts(vcpu);
 449
 450         local_irq_disable();
 451         kvm_guest_enter();
 452         r = __kvmppc_vcpu_run(run, vcpu);
 453         kvm_guest_exit();
 454         local_irq_enable();
 455
 456         if (vcpu->sigset_active)
 457                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 458
 459         vcpu_put(vcpu);
 460
 461         return r;
 462 }
 463
 464 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 465 {
 466         if (irq->irq == KVM_INTERRUPT_UNSET)
 467                 kvmppc_core_dequeue_external(vcpu, irq);
 468         else
 469                 kvmppc_core_queue_external(vcpu, irq);
 470
 471         if (waitqueue_active(&vcpu->wq)) {
 472                 wake_up_interruptible(&vcpu->wq);
 473                 vcpu->stat.halt_wakeup++;
 474         }
 475
 476         return 0;
 477 }
 478
 479 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 480                                      struct kvm_enable_cap *cap)
 481 {
 482         int r;
 483
 484         if (cap->flags)
 485                 return -EINVAL;
 486
 487         switch (cap->cap) {
 488         case KVM_CAP_PPC_OSI:
 489                 r = 0;
 490                 vcpu->arch.osi_enabled = true;
 491                 break;
 492         default:
 493                 r = -EINVAL;
 494                 break;
 495         }
 496
 497         return r;
 498 }
 499
 500 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 501                                     struct kvm_mp_state *mp_state)
 502 {
 503         return -EINVAL;
 504 }
 505
 506 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 507                                     struct kvm_mp_state *mp_state)
 508 {
 509         return -EINVAL;
 510 }
 511
 512 long kvm_arch_vcpu_ioctl(struct file *filp,
 513                          unsigned int ioctl, unsigned long arg)
 514 {
 515         struct kvm_vcpu *vcpu = filp->private_data;
 516         void __user *argp = (void __user *)arg;
 517         long r;
 518
 519         switch (ioctl) {
 520         case KVM_INTERRUPT: {
 521                 struct kvm_interrupt irq;
 522                 r = -EFAULT;
 523                 if (copy_from_user(&irq, argp, sizeof(irq)))
 524                         goto out;
 525                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 526                 break;
 527         }
 528         case KVM_ENABLE_CAP:
 529         {
 530                 struct kvm_enable_cap cap;
 531                 r = -EFAULT;
 532                 if (copy_from_user(&cap, argp, sizeof(cap)))
 533                         goto out;
 534                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 535                 break;
 536         }
 537         default:
 538                 r = -EINVAL;
 539         }
 540
 541 out:
 542         return r;
 543 }
 544
 545 long kvm_arch_vm_ioctl(struct file *filp,
 546                        unsigned int ioctl, unsigned long arg)
 547 {
 548         long r;
 549
 550         switch (ioctl) {
 551         default:
 552                 r = -ENOTTY;
 553         }
 554
 555         return r;
 556 }
 557
 558 int kvm_arch_init(void *opaque)
 559 {
 560         return 0;
 561 }
 562
 563 void kvm_arch_exit(void)
 564 {
 565 }