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) || defined(CONFIG_KVM_E500)
  77                 /* XXX Missing magic page on 44x */
  78                 r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
  79 #endif
  80
  81                 /* Second return value is in r4 */
  82                 break;
  83         default:
  84                 r = HC_EV_UNIMPLEMENTED;
  85                 break;
  86         }
  87
  88         kvmppc_set_gpr(vcpu, 4, r2);
  89
  90         return r;
  91 }
  92
  93 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  94 {
  95         enum emulation_result er;
  96         int r;
  97
  98         er = kvmppc_emulate_instruction(run, vcpu);
  99         switch (er) {
 100         case EMULATE_DONE:
 101                 /* Future optimization: only reload non-volatiles if they were
 102                  * actually modified. */
 103                 r = RESUME_GUEST_NV;
 104                 break;
 105         case EMULATE_DO_MMIO:
 106                 run->exit_reason = KVM_EXIT_MMIO;
 107                 /* We must reload nonvolatiles because "update" load/store
 108                  * instructions modify register state. */
 109                 /* Future optimization: only reload non-volatiles if they were
 110                  * actually modified. */
 111                 r = RESUME_HOST_NV;
 112                 break;
 113         case EMULATE_FAIL:
 114                 /* XXX Deliver Program interrupt to guest. */
 115                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
 116                        kvmppc_get_last_inst(vcpu));
 117                 r = RESUME_HOST;
 118                 break;
 119         default:
 120                 BUG();
 121         }
 122
 123         return r;
 124 }
 125
 126 int kvm_arch_hardware_enable(void *garbage)
 127 {
 128         return 0;
 129 }
 130
 131 void kvm_arch_hardware_disable(void *garbage)
 132 {
 133 }
 134
 135 int kvm_arch_hardware_setup(void)
 136 {
 137         return 0;
 138 }
 139
 140 void kvm_arch_hardware_unsetup(void)
 141 {
 142 }
 143
 144 void kvm_arch_check_processor_compat(void *rtn)
 145 {
 146         *(int *)rtn = kvmppc_core_check_processor_compat();
 147 }
 148
 149 int kvm_arch_init_vm(struct kvm *kvm)
 150 {
 151         return 0;
 152 }
 153
 154 void kvm_arch_destroy_vm(struct kvm *kvm)
 155 {
 156         unsigned int i;
 157         struct kvm_vcpu *vcpu;
 158
 159         kvm_for_each_vcpu(i, vcpu, kvm)
 160                 kvm_arch_vcpu_free(vcpu);
 161
 162         mutex_lock(&kvm->lock);
 163         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 164                 kvm->vcpus[i] = NULL;
 165
 166         atomic_set(&kvm->online_vcpus, 0);
 167         mutex_unlock(&kvm->lock);
 168 }
 169
 170 void kvm_arch_sync_events(struct kvm *kvm)
 171 {
 172 }
 173
 174 int kvm_dev_ioctl_check_extension(long ext)
 175 {
 176         int r;
 177
 178         switch (ext) {
 179 #ifdef CONFIG_BOOKE
 180         case KVM_CAP_PPC_BOOKE_SREGS:
 181 #else
 182         case KVM_CAP_PPC_SEGSTATE:
 183 #endif
 184         case KVM_CAP_PPC_PAIRED_SINGLES:
 185         case KVM_CAP_PPC_UNSET_IRQ:
 186         case KVM_CAP_PPC_IRQ_LEVEL:
 187         case KVM_CAP_ENABLE_CAP:
 188         case KVM_CAP_PPC_OSI:
 189         case KVM_CAP_PPC_GET_PVINFO:
 190                 r = 1;
 191                 break;
 192         case KVM_CAP_COALESCED_MMIO:
 193                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 194                 break;
 195         default:
 196                 r = 0;
 197                 break;
 198         }
 199         return r;
 200
 201 }
 202
 203 long kvm_arch_dev_ioctl(struct file *filp,
 204                         unsigned int ioctl, unsigned long arg)
 205 {
 206         return -EINVAL;
 207 }
 208
 209 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 210                                    struct kvm_memory_slot *memslot,
 211                                    struct kvm_memory_slot old,
 212                                    struct kvm_userspace_memory_region *mem,
 213                                    int user_alloc)
 214 {
 215         return 0;
 216 }
 217
 218 void kvm_arch_commit_memory_region(struct kvm *kvm,
 219                struct kvm_userspace_memory_region *mem,
 220                struct kvm_memory_slot old,
 221                int user_alloc)
 222 {
 223        return;
 224 }
 225
 226
 227 void kvm_arch_flush_shadow(struct kvm *kvm)
 228 {
 229 }
 230
 231 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 232 {
 233         struct kvm_vcpu *vcpu;
 234         vcpu = kvmppc_core_vcpu_create(kvm, id);
 235         if (!IS_ERR(vcpu))
 236                 kvmppc_create_vcpu_debugfs(vcpu, id);
 237         return vcpu;
 238 }
 239
 240 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 241 {
 242         /* Make sure we're not using the vcpu anymore */
 243         hrtimer_cancel(&vcpu->arch.dec_timer);
 244         tasklet_kill(&vcpu->arch.tasklet);
 245
 246         kvmppc_remove_vcpu_debugfs(vcpu);
 247         kvmppc_core_vcpu_free(vcpu);
 248 }
 249
 250 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 251 {
 252         kvm_arch_vcpu_free(vcpu);
 253 }
 254
 255 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 256 {
 257         return kvmppc_core_pending_dec(vcpu);
 258 }
 259
 260 static void kvmppc_decrementer_func(unsigned long data)
 261 {
 262         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 263
 264         kvmppc_core_queue_dec(vcpu);
 265
 266         if (waitqueue_active(&vcpu->wq)) {
 267                 wake_up_interruptible(&vcpu->wq);
 268                 vcpu->stat.halt_wakeup++;
 269         }
 270 }
 271
 272 /*
 273  * low level hrtimer wake routine. Because this runs in hardirq context
 274  * we schedule a tasklet to do the real work.
 275  */
 276 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 277 {
 278         struct kvm_vcpu *vcpu;
 279
 280         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 281         tasklet_schedule(&vcpu->arch.tasklet);
 282
 283         return HRTIMER_NORESTART;
 284 }
 285
 286 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 287 {
 288         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 289         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 290         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 291
 292 #ifdef CONFIG_KVM_EXIT_TIMING
 293         mutex_init(&vcpu->arch.exit_timing_lock);
 294 #endif
 295
 296         return 0;
 297 }
 298
 299 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 300 {
 301         kvmppc_mmu_destroy(vcpu);
 302 }
 303
 304 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 305 {
 306 #ifdef CONFIG_BOOKE
 307         /*
 308          * vrsave (formerly usprg0) isn't used by Linux, but may
 309          * be used by the guest.
 310          *
 311          * On non-booke this is associated with Altivec and
 312          * is handled by code in book3s.c.
 313          */
 314         mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
 315 #endif
 316         kvmppc_core_vcpu_load(vcpu, cpu);
 317 }
 318
 319 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 320 {
 321         kvmppc_core_vcpu_put(vcpu);
 322 #ifdef CONFIG_BOOKE
 323         vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
 324 #endif
 325 }
 326
 327 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 328                                         struct kvm_guest_debug *dbg)
 329 {
 330         return -EINVAL;
 331 }
 332
 333 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 334                                      struct kvm_run *run)
 335 {
 336         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 337 }
 338
 339 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 340                                       struct kvm_run *run)
 341 {
 342         u64 uninitialized_var(gpr);
 343
 344         if (run->mmio.len > sizeof(gpr)) {
 345                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 346                 return;
 347         }
 348
 349         if (vcpu->arch.mmio_is_bigendian) {
 350                 switch (run->mmio.len) {
 351                 case 8: gpr = *(u64 *)run->mmio.data; break;
 352                 case 4: gpr = *(u32 *)run->mmio.data; break;
 353                 case 2: gpr = *(u16 *)run->mmio.data; break;
 354                 case 1: gpr = *(u8 *)run->mmio.data; break;
 355                 }
 356         } else {
 357                 /* Convert BE data from userland back to LE. */
 358                 switch (run->mmio.len) {
 359                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 360                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 361                 case 1: gpr = *(u8 *)run->mmio.data; break;
 362                 }
 363         }
 364
 365         if (vcpu->arch.mmio_sign_extend) {
 366                 switch (run->mmio.len) {
 367 #ifdef CONFIG_PPC64
 368                 case 4:
 369                         gpr = (s64)(s32)gpr;
 370                         break;
 371 #endif
 372                 case 2:
 373                         gpr = (s64)(s16)gpr;
 374                         break;
 375                 case 1:
 376                         gpr = (s64)(s8)gpr;
 377                         break;
 378                 }
 379         }
 380
 381         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 382
 383         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
 384         case KVM_REG_GPR:
 385                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 386                 break;
 387         case KVM_REG_FPR:
 388                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 389                 break;
 390 #ifdef CONFIG_PPC_BOOK3S
 391         case KVM_REG_QPR:
 392                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 393                 break;
 394         case KVM_REG_FQPR:
 395                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 396                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 397                 break;
 398 #endif
 399         default:
 400                 BUG();
 401         }
 402 }
 403
 404 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 405                        unsigned int rt, unsigned int bytes, int is_bigendian)
 406 {
 407         if (bytes > sizeof(run->mmio.data)) {
 408                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 409                        run->mmio.len);
 410         }
 411
 412         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 413         run->mmio.len = bytes;
 414         run->mmio.is_write = 0;
 415
 416         vcpu->arch.io_gpr = rt;
 417         vcpu->arch.mmio_is_bigendian = is_bigendian;
 418         vcpu->mmio_needed = 1;
 419         vcpu->mmio_is_write = 0;
 420         vcpu->arch.mmio_sign_extend = 0;
 421
 422         return EMULATE_DO_MMIO;
 423 }
 424
 425 /* Same as above, but sign extends */
 426 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 427                         unsigned int rt, unsigned int bytes, int is_bigendian)
 428 {
 429         int r;
 430
 431         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 432         vcpu->arch.mmio_sign_extend = 1;
 433
 434         return r;
 435 }
 436
 437 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 438                         u64 val, unsigned int bytes, int is_bigendian)
 439 {
 440         void *data = run->mmio.data;
 441
 442         if (bytes > sizeof(run->mmio.data)) {
 443                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 444                        run->mmio.len);
 445         }
 446
 447         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 448         run->mmio.len = bytes;
 449         run->mmio.is_write = 1;
 450         vcpu->mmio_needed = 1;
 451         vcpu->mmio_is_write = 1;
 452
 453         /* Store the value at the lowest bytes in 'data'. */
 454         if (is_bigendian) {
 455                 switch (bytes) {
 456                 case 8: *(u64 *)data = val; break;
 457                 case 4: *(u32 *)data = val; break;
 458                 case 2: *(u16 *)data = val; break;
 459                 case 1: *(u8  *)data = val; break;
 460                 }
 461         } else {
 462                 /* Store LE value into 'data'. */
 463                 switch (bytes) {
 464                 case 4: st_le32(data, val); break;
 465                 case 2: st_le16(data, val); break;
 466                 case 1: *(u8 *)data = val; break;
 467                 }
 468         }
 469
 470         return EMULATE_DO_MMIO;
 471 }
 472
 473 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 474 {
 475         int r;
 476         sigset_t sigsaved;
 477
 478         if (vcpu->sigset_active)
 479                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 480
 481         if (vcpu->mmio_needed) {
 482                 if (!vcpu->mmio_is_write)
 483                         kvmppc_complete_mmio_load(vcpu, run);
 484                 vcpu->mmio_needed = 0;
 485         } else if (vcpu->arch.dcr_needed) {
 486                 if (!vcpu->arch.dcr_is_write)
 487                         kvmppc_complete_dcr_load(vcpu, run);
 488                 vcpu->arch.dcr_needed = 0;
 489         } else if (vcpu->arch.osi_needed) {
 490                 u64 *gprs = run->osi.gprs;
 491                 int i;
 492
 493                 for (i = 0; i < 32; i++)
 494                         kvmppc_set_gpr(vcpu, i, gprs[i]);
 495                 vcpu->arch.osi_needed = 0;
 496         }
 497
 498         kvmppc_core_deliver_interrupts(vcpu);
 499
 500         local_irq_disable();
 501         kvm_guest_enter();
 502         r = __kvmppc_vcpu_run(run, vcpu);
 503         kvm_guest_exit();
 504         local_irq_enable();
 505
 506         if (vcpu->sigset_active)
 507                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 508
 509         return r;
 510 }
 511
 512 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 513 {
 514         if (irq->irq == KVM_INTERRUPT_UNSET)
 515                 kvmppc_core_dequeue_external(vcpu, irq);
 516         else
 517                 kvmppc_core_queue_external(vcpu, irq);
 518
 519         if (waitqueue_active(&vcpu->wq)) {
 520                 wake_up_interruptible(&vcpu->wq);
 521                 vcpu->stat.halt_wakeup++;
 522         }
 523
 524         return 0;
 525 }
 526
 527 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 528                                      struct kvm_enable_cap *cap)
 529 {
 530         int r;
 531
 532         if (cap->flags)
 533                 return -EINVAL;
 534
 535         switch (cap->cap) {
 536         case KVM_CAP_PPC_OSI:
 537                 r = 0;
 538                 vcpu->arch.osi_enabled = true;
 539                 break;
 540         default:
 541                 r = -EINVAL;
 542                 break;
 543         }
 544
 545         return r;
 546 }
 547
 548 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 549                                     struct kvm_mp_state *mp_state)
 550 {
 551         return -EINVAL;
 552 }
 553
 554 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 555                                     struct kvm_mp_state *mp_state)
 556 {
 557         return -EINVAL;
 558 }
 559
 560 long kvm_arch_vcpu_ioctl(struct file *filp,
 561                          unsigned int ioctl, unsigned long arg)
 562 {
 563         struct kvm_vcpu *vcpu = filp->private_data;
 564         void __user *argp = (void __user *)arg;
 565         long r;
 566
 567         switch (ioctl) {
 568         case KVM_INTERRUPT: {
 569                 struct kvm_interrupt irq;
 570                 r = -EFAULT;
 571                 if (copy_from_user(&irq, argp, sizeof(irq)))
 572                         goto out;
 573                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 574                 goto out;
 575         }
 576
 577         case KVM_ENABLE_CAP:
 578         {
 579                 struct kvm_enable_cap cap;
 580                 r = -EFAULT;
 581                 if (copy_from_user(&cap, argp, sizeof(cap)))
 582                         goto out;
 583                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 584                 break;
 585         }
 586         default:
 587                 r = -EINVAL;
 588         }
 589
 590 out:
 591         return r;
 592 }
 593
 594 static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
 595 {
 596         u32 inst_lis = 0x3c000000;
 597         u32 inst_ori = 0x60000000;
 598         u32 inst_nop = 0x60000000;
 599         u32 inst_sc = 0x44000002;
 600         u32 inst_imm_mask = 0xffff;
 601
 602         /*
 603          * The hypercall to get into KVM from within guest context is as
 604          * follows:
 605          *
 606          *    lis r0, r0, KVM_SC_MAGIC_R0@h
 607          *    ori r0, KVM_SC_MAGIC_R0@l
 608          *    sc
 609          *    nop
 610          */
 611         pvinfo->hcall[0] = inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask);
 612         pvinfo->hcall[1] = inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask);
 613         pvinfo->hcall[2] = inst_sc;
 614         pvinfo->hcall[3] = inst_nop;
 615
 616         return 0;
 617 }
 618
 619 long kvm_arch_vm_ioctl(struct file *filp,
 620                        unsigned int ioctl, unsigned long arg)
 621 {
 622         void __user *argp = (void __user *)arg;
 623         long r;
 624
 625         switch (ioctl) {
 626         case KVM_PPC_GET_PVINFO: {
 627                 struct kvm_ppc_pvinfo pvinfo;
 628                 memset(&pvinfo, 0, sizeof(pvinfo));
 629                 r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
 630                 if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
 631                         r = -EFAULT;
 632                         goto out;
 633                 }
 634
 635                 break;
 636         }
 637         default:
 638                 r = -ENOTTY;
 639         }
 640
 641 out:
 642         return r;
 643 }
 644
 645 int kvm_arch_init(void *opaque)
 646 {
 647         return 0;
 648 }
 649
 650 void kvm_arch_exit(void)
 651 {
 652 }