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 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  40 {
  41         return !(v->arch.shared->msr & MSR_WE) ||
  42                !!(v->arch.pending_exceptions);
  43 }
  44
  45 int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
  46 {
  47         int nr = kvmppc_get_gpr(vcpu, 11);
  48         int r;
  49         unsigned long __maybe_unused param1 = kvmppc_get_gpr(vcpu, 3);
  50         unsigned long __maybe_unused param2 = kvmppc_get_gpr(vcpu, 4);
  51         unsigned long __maybe_unused param3 = kvmppc_get_gpr(vcpu, 5);
  52         unsigned long __maybe_unused param4 = kvmppc_get_gpr(vcpu, 6);
  53         unsigned long r2 = 0;
  54
  55         if (!(vcpu->arch.shared->msr & MSR_SF)) {
  56                 /* 32 bit mode */
  57                 param1 &= 0xffffffff;
  58                 param2 &= 0xffffffff;
  59                 param3 &= 0xffffffff;
  60                 param4 &= 0xffffffff;
  61         }
  62
  63         switch (nr) {
  64         case HC_VENDOR_KVM | KVM_HC_PPC_MAP_MAGIC_PAGE:
  65         {
  66                 vcpu->arch.magic_page_pa = param1;
  67                 vcpu->arch.magic_page_ea = param2;
  68
  69                 r2 = KVM_MAGIC_FEAT_SR;
  70
  71                 r = HC_EV_SUCCESS;
  72                 break;
  73         }
  74         case HC_VENDOR_KVM | KVM_HC_FEATURES:
  75                 r = HC_EV_SUCCESS;
  76 #if defined(CONFIG_PPC_BOOK3S) /* XXX Missing magic page on BookE */
  77                 r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
  78 #endif
  79
  80                 /* Second return value is in r4 */
  81                 break;
  82         default:
  83                 r = HC_EV_UNIMPLEMENTED;
  84                 break;
  85         }
  86
  87         kvmppc_set_gpr(vcpu, 4, r2);
  88
  89         return r;
  90 }
  91
  92 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  93 {
  94         enum emulation_result er;
  95         int r;
  96
  97         er = kvmppc_emulate_instruction(run, vcpu);
  98         switch (er) {
  99         case EMULATE_DONE:
 100                 /* Future optimization: only reload non-volatiles if they were
 101                  * actually modified. */
 102                 r = RESUME_GUEST_NV;
 103                 break;
 104         case EMULATE_DO_MMIO:
 105                 run->exit_reason = KVM_EXIT_MMIO;
 106                 /* We must reload nonvolatiles because "update" load/store
 107                  * instructions modify register state. */
 108                 /* Future optimization: only reload non-volatiles if they were
 109                  * actually modified. */
 110                 r = RESUME_HOST_NV;
 111                 break;
 112         case EMULATE_FAIL:
 113                 /* XXX Deliver Program interrupt to guest. */
 114                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
 115                        kvmppc_get_last_inst(vcpu));
 116                 r = RESUME_HOST;
 117                 break;
 118         default:
 119                 BUG();
 120         }
 121
 122         return r;
 123 }
 124
 125 int kvm_arch_hardware_enable(void *garbage)
 126 {
 127         return 0;
 128 }
 129
 130 void kvm_arch_hardware_disable(void *garbage)
 131 {
 132 }
 133
 134 int kvm_arch_hardware_setup(void)
 135 {
 136         return 0;
 137 }
 138
 139 void kvm_arch_hardware_unsetup(void)
 140 {
 141 }
 142
 143 void kvm_arch_check_processor_compat(void *rtn)
 144 {
 145         *(int *)rtn = kvmppc_core_check_processor_compat();
 146 }
 147
 148 int kvm_arch_init_vm(struct kvm *kvm)
 149 {
 150         return 0;
 151 }
 152
 153 void kvm_arch_destroy_vm(struct kvm *kvm)
 154 {
 155         unsigned int i;
 156         struct kvm_vcpu *vcpu;
 157
 158         kvm_for_each_vcpu(i, vcpu, kvm)
 159                 kvm_arch_vcpu_free(vcpu);
 160
 161         mutex_lock(&kvm->lock);
 162         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 163                 kvm->vcpus[i] = NULL;
 164
 165         atomic_set(&kvm->online_vcpus, 0);
 166         mutex_unlock(&kvm->lock);
 167 }
 168
 169 void kvm_arch_sync_events(struct kvm *kvm)
 170 {
 171 }
 172
 173 int kvm_dev_ioctl_check_extension(long ext)
 174 {
 175         int r;
 176
 177         switch (ext) {
 178 #ifdef CONFIG_BOOKE
 179         case KVM_CAP_PPC_BOOKE_SREGS:
 180 #else
 181         case KVM_CAP_PPC_SEGSTATE:
 182 #endif
 183         case KVM_CAP_PPC_PAIRED_SINGLES:
 184         case KVM_CAP_PPC_UNSET_IRQ:
 185         case KVM_CAP_PPC_IRQ_LEVEL:
 186         case KVM_CAP_ENABLE_CAP:
 187         case KVM_CAP_PPC_OSI:
 188         case KVM_CAP_PPC_GET_PVINFO:
 189                 r = 1;
 190                 break;
 191         case KVM_CAP_COALESCED_MMIO:
 192                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 193                 break;
 194         default:
 195                 r = 0;
 196                 break;
 197         }
 198         return r;
 199
 200 }
 201
 202 long kvm_arch_dev_ioctl(struct file *filp,
 203                         unsigned int ioctl, unsigned long arg)
 204 {
 205         return -EINVAL;
 206 }
 207
 208 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 209                                    struct kvm_memory_slot *memslot,
 210                                    struct kvm_memory_slot old,
 211                                    struct kvm_userspace_memory_region *mem,
 212                                    int user_alloc)
 213 {
 214         return 0;
 215 }
 216
 217 void kvm_arch_commit_memory_region(struct kvm *kvm,
 218                struct kvm_userspace_memory_region *mem,
 219                struct kvm_memory_slot old,
 220                int user_alloc)
 221 {
 222        return;
 223 }
 224
 225
 226 void kvm_arch_flush_shadow(struct kvm *kvm)
 227 {
 228 }
 229
 230 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 231 {
 232         struct kvm_vcpu *vcpu;
 233         vcpu = kvmppc_core_vcpu_create(kvm, id);
 234         if (!IS_ERR(vcpu))
 235                 kvmppc_create_vcpu_debugfs(vcpu, id);
 236         return vcpu;
 237 }
 238
 239 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 240 {
 241         /* Make sure we're not using the vcpu anymore */
 242         hrtimer_cancel(&vcpu->arch.dec_timer);
 243         tasklet_kill(&vcpu->arch.tasklet);
 244
 245         kvmppc_remove_vcpu_debugfs(vcpu);
 246         kvmppc_core_vcpu_free(vcpu);
 247 }
 248
 249 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 250 {
 251         kvm_arch_vcpu_free(vcpu);
 252 }
 253
 254 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 255 {
 256         return kvmppc_core_pending_dec(vcpu);
 257 }
 258
 259 static void kvmppc_decrementer_func(unsigned long data)
 260 {
 261         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 262
 263         kvmppc_core_queue_dec(vcpu);
 264
 265         if (waitqueue_active(&vcpu->wq)) {
 266                 wake_up_interruptible(&vcpu->wq);
 267                 vcpu->stat.halt_wakeup++;
 268         }
 269 }
 270
 271 /*
 272  * low level hrtimer wake routine. Because this runs in hardirq context
 273  * we schedule a tasklet to do the real work.
 274  */
 275 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 276 {
 277         struct kvm_vcpu *vcpu;
 278
 279         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 280         tasklet_schedule(&vcpu->arch.tasklet);
 281
 282         return HRTIMER_NORESTART;
 283 }
 284
 285 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 286 {
 287         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 288         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 289         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 290
 291 #ifdef CONFIG_KVM_EXIT_TIMING
 292         mutex_init(&vcpu->arch.exit_timing_lock);
 293 #endif
 294
 295         return 0;
 296 }
 297
 298 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 299 {
 300         kvmppc_mmu_destroy(vcpu);
 301 }
 302
 303 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 304 {
 305 #ifdef CONFIG_BOOKE
 306         /*
 307          * vrsave (formerly usprg0) isn't used by Linux, but may
 308          * be used by the guest.
 309          *
 310          * On non-booke this is associated with Altivec and
 311          * is handled by code in book3s.c.
 312          */
 313         mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
 314 #endif
 315         kvmppc_core_vcpu_load(vcpu, cpu);
 316 }
 317
 318 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 319 {
 320         kvmppc_core_vcpu_put(vcpu);
 321 #ifdef CONFIG_BOOKE
 322         vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
 323 #endif
 324 }
 325
 326 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 327                                         struct kvm_guest_debug *dbg)
 328 {
 329         return -EINVAL;
 330 }
 331
 332 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 333                                      struct kvm_run *run)
 334 {
 335         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 336 }
 337
 338 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 339                                       struct kvm_run *run)
 340 {
 341         u64 uninitialized_var(gpr);
 342
 343         if (run->mmio.len > sizeof(gpr)) {
 344                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 345                 return;
 346         }
 347
 348         if (vcpu->arch.mmio_is_bigendian) {
 349                 switch (run->mmio.len) {
 350                 case 8: gpr = *(u64 *)run->mmio.data; break;
 351                 case 4: gpr = *(u32 *)run->mmio.data; break;
 352                 case 2: gpr = *(u16 *)run->mmio.data; break;
 353                 case 1: gpr = *(u8 *)run->mmio.data; break;
 354                 }
 355         } else {
 356                 /* Convert BE data from userland back to LE. */
 357                 switch (run->mmio.len) {
 358                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 359                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 360                 case 1: gpr = *(u8 *)run->mmio.data; break;
 361                 }
 362         }
 363
 364         if (vcpu->arch.mmio_sign_extend) {
 365                 switch (run->mmio.len) {
 366 #ifdef CONFIG_PPC64
 367                 case 4:
 368                         gpr = (s64)(s32)gpr;
 369                         break;
 370 #endif
 371                 case 2:
 372                         gpr = (s64)(s16)gpr;
 373                         break;
 374                 case 1:
 375                         gpr = (s64)(s8)gpr;
 376                         break;
 377                 }
 378         }
 379
 380         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 381
 382         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
 383         case KVM_REG_GPR:
 384                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 385                 break;
 386         case KVM_REG_FPR:
 387                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 388                 break;
 389 #ifdef CONFIG_PPC_BOOK3S
 390         case KVM_REG_QPR:
 391                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 392                 break;
 393         case KVM_REG_FQPR:
 394                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 395                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 396                 break;
 397 #endif
 398         default:
 399                 BUG();
 400         }
 401 }
 402
 403 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 404                        unsigned int rt, unsigned int bytes, int is_bigendian)
 405 {
 406         if (bytes > sizeof(run->mmio.data)) {
 407                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 408                        run->mmio.len);
 409         }
 410
 411         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 412         run->mmio.len = bytes;
 413         run->mmio.is_write = 0;
 414
 415         vcpu->arch.io_gpr = rt;
 416         vcpu->arch.mmio_is_bigendian = is_bigendian;
 417         vcpu->mmio_needed = 1;
 418         vcpu->mmio_is_write = 0;
 419         vcpu->arch.mmio_sign_extend = 0;
 420
 421         return EMULATE_DO_MMIO;
 422 }
 423
 424 /* Same as above, but sign extends */
 425 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 426                         unsigned int rt, unsigned int bytes, int is_bigendian)
 427 {
 428         int r;
 429
 430         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 431         vcpu->arch.mmio_sign_extend = 1;
 432
 433         return r;
 434 }
 435
 436 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 437                         u64 val, unsigned int bytes, int is_bigendian)
 438 {
 439         void *data = run->mmio.data;
 440
 441         if (bytes > sizeof(run->mmio.data)) {
 442                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 443                        run->mmio.len);
 444         }
 445
 446         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 447         run->mmio.len = bytes;
 448         run->mmio.is_write = 1;
 449         vcpu->mmio_needed = 1;
 450         vcpu->mmio_is_write = 1;
 451
 452         /* Store the value at the lowest bytes in 'data'. */
 453         if (is_bigendian) {
 454                 switch (bytes) {
 455                 case 8: *(u64 *)data = val; break;
 456                 case 4: *(u32 *)data = val; break;
 457                 case 2: *(u16 *)data = val; break;
 458                 case 1: *(u8  *)data = val; break;
 459                 }
 460         } else {
 461                 /* Store LE value into 'data'. */
 462                 switch (bytes) {
 463                 case 4: st_le32(data, val); break;
 464                 case 2: st_le16(data, val); break;
 465                 case 1: *(u8 *)data = val; break;
 466                 }
 467         }
 468
 469         return EMULATE_DO_MMIO;
 470 }
 471
 472 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 473 {
 474         int r;
 475         sigset_t sigsaved;
 476
 477         if (vcpu->sigset_active)
 478                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 479
 480         if (vcpu->mmio_needed) {
 481                 if (!vcpu->mmio_is_write)
 482                         kvmppc_complete_mmio_load(vcpu, run);
 483                 vcpu->mmio_needed = 0;
 484         } else if (vcpu->arch.dcr_needed) {
 485                 if (!vcpu->arch.dcr_is_write)
 486                         kvmppc_complete_dcr_load(vcpu, run);
 487                 vcpu->arch.dcr_needed = 0;
 488         } else if (vcpu->arch.osi_needed) {
 489                 u64 *gprs = run->osi.gprs;
 490                 int i;
 491
 492                 for (i = 0; i < 32; i++)
 493                         kvmppc_set_gpr(vcpu, i, gprs[i]);
 494                 vcpu->arch.osi_needed = 0;
 495         }
 496
 497         kvmppc_core_deliver_interrupts(vcpu);
 498
 499         local_irq_disable();
 500         kvm_guest_enter();
 501         r = __kvmppc_vcpu_run(run, vcpu);
 502         kvm_guest_exit();
 503         local_irq_enable();
 504
 505         if (vcpu->sigset_active)
 506                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 507
 508         return r;
 509 }
 510
 511 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 512 {
 513         if (irq->irq == KVM_INTERRUPT_UNSET)
 514                 kvmppc_core_dequeue_external(vcpu, irq);
 515         else
 516                 kvmppc_core_queue_external(vcpu, irq);
 517
 518         if (waitqueue_active(&vcpu->wq)) {
 519                 wake_up_interruptible(&vcpu->wq);
 520                 vcpu->stat.halt_wakeup++;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 527                                      struct kvm_enable_cap *cap)
 528 {
 529         int r;
 530
 531         if (cap->flags)
 532                 return -EINVAL;
 533
 534         switch (cap->cap) {
 535         case KVM_CAP_PPC_OSI:
 536                 r = 0;
 537                 vcpu->arch.osi_enabled = true;
 538                 break;
 539         default:
 540                 r = -EINVAL;
 541                 break;
 542         }
 543
 544         return r;
 545 }
 546
 547 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 548                                     struct kvm_mp_state *mp_state)
 549 {
 550         return -EINVAL;
 551 }
 552
 553 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 554                                     struct kvm_mp_state *mp_state)
 555 {
 556         return -EINVAL;
 557 }
 558
 559 long kvm_arch_vcpu_ioctl(struct file *filp,
 560                          unsigned int ioctl, unsigned long arg)
 561 {
 562         struct kvm_vcpu *vcpu = filp->private_data;
 563         void __user *argp = (void __user *)arg;
 564         long r;
 565
 566         switch (ioctl) {
 567         case KVM_INTERRUPT: {
 568                 struct kvm_interrupt irq;
 569                 r = -EFAULT;
 570                 if (copy_from_user(&irq, argp, sizeof(irq)))
 571                         goto out;
 572                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 573                 goto out;
 574         }
 575
 576         case KVM_ENABLE_CAP:
 577         {
 578                 struct kvm_enable_cap cap;
 579                 r = -EFAULT;
 580                 if (copy_from_user(&cap, argp, sizeof(cap)))
 581                         goto out;
 582                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 583                 break;
 584         }
 585         default:
 586                 r = -EINVAL;
 587         }
 588
 589 out:
 590         return r;
 591 }
 592
 593 static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
 594 {
 595         u32 inst_lis = 0x3c000000;
 596         u32 inst_ori = 0x60000000;
 597         u32 inst_nop = 0x60000000;
 598         u32 inst_sc = 0x44000002;
 599         u32 inst_imm_mask = 0xffff;
 600
 601         /*
 602          * The hypercall to get into KVM from within guest context is as
 603          * follows:
 604          *
 605          *    lis r0, r0, KVM_SC_MAGIC_R0@h
 606          *    ori r0, KVM_SC_MAGIC_R0@l
 607          *    sc
 608          *    nop
 609          */
 610         pvinfo->hcall[0] = inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask);
 611         pvinfo->hcall[1] = inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask);
 612         pvinfo->hcall[2] = inst_sc;
 613         pvinfo->hcall[3] = inst_nop;
 614
 615         return 0;
 616 }
 617
 618 long kvm_arch_vm_ioctl(struct file *filp,
 619                        unsigned int ioctl, unsigned long arg)
 620 {
 621         void __user *argp = (void __user *)arg;
 622         long r;
 623
 624         switch (ioctl) {
 625         case KVM_PPC_GET_PVINFO: {
 626                 struct kvm_ppc_pvinfo pvinfo;
 627                 memset(&pvinfo, 0, sizeof(pvinfo));
 628                 r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
 629                 if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
 630                         r = -EFAULT;
 631                         goto out;
 632                 }
 633
 634                 break;
 635         }
 636         default:
 637                 r = -ENOTTY;
 638         }
 639
 640 out:
 641         return r;
 642 }
 643
 644 int kvm_arch_init(void *opaque)
 645 {
 646         return 0;
 647 }
 648
 649 void kvm_arch_exit(void)
 650 {
 651 }