arch/powerpc/kvm/book3s.c

   1 /*
   2  * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
   3  *
   4  * Authors:
   5  *    Alexander Graf <agraf@suse.de>
   6  *    Kevin Wolf <mail@kevin-wolf.de>
   7  *
   8  * Description:
   9  * This file is derived from arch/powerpc/kvm/44x.c,
  10  * by Hollis Blanchard <hollisb@us.ibm.com>.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License, version 2, as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/kvm_host.h>
  18 #include <linux/err.h>
  19 #include <linux/slab.h>
  20 #include "trace.h"
  21
  22 #include <asm/reg.h>
  23 #include <asm/cputable.h>
  24 #include <asm/cacheflush.h>
  25 #include <asm/tlbflush.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/io.h>
  28 #include <asm/kvm_ppc.h>
  29 #include <asm/kvm_book3s.h>
  30 #include <asm/mmu_context.h>
  31 #include <linux/gfp.h>
  32 #include <linux/sched.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/highmem.h>
  35
  36 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  37
  38 /* #define EXIT_DEBUG */
  39 /* #define DEBUG_EXT */
  40
  41 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
  42                              ulong msr);
  43
  44 /* Some compatibility defines */
  45 #ifdef CONFIG_PPC_BOOK3S_32
  46 #define MSR_USER32 MSR_USER
  47 #define MSR_USER64 MSR_USER
  48 #define HW_PAGE_SIZE PAGE_SIZE
  49 #endif
  50
  51 struct kvm_stats_debugfs_item debugfs_entries[] = {
  52         { "exits",       VCPU_STAT(sum_exits) },
  53         { "mmio",        VCPU_STAT(mmio_exits) },
  54         { "sig",         VCPU_STAT(signal_exits) },
  55         { "sysc",        VCPU_STAT(syscall_exits) },
  56         { "inst_emu",    VCPU_STAT(emulated_inst_exits) },
  57         { "dec",         VCPU_STAT(dec_exits) },
  58         { "ext_intr",    VCPU_STAT(ext_intr_exits) },
  59         { "queue_intr",  VCPU_STAT(queue_intr) },
  60         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  61         { "pf_storage",  VCPU_STAT(pf_storage) },
  62         { "sp_storage",  VCPU_STAT(sp_storage) },
  63         { "pf_instruc",  VCPU_STAT(pf_instruc) },
  64         { "sp_instruc",  VCPU_STAT(sp_instruc) },
  65         { "ld",          VCPU_STAT(ld) },
  66         { "ld_slow",     VCPU_STAT(ld_slow) },
  67         { "st",          VCPU_STAT(st) },
  68         { "st_slow",     VCPU_STAT(st_slow) },
  69         { NULL }
  70 };
  71
  72 void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
  73 {
  74 }
  75
  76 void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
  77 {
  78 }
  79
  80 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  81 {
  82 #ifdef CONFIG_PPC_BOOK3S_64
  83         memcpy(to_svcpu(vcpu)->slb, to_book3s(vcpu)->slb_shadow, sizeof(to_svcpu(vcpu)->slb));
  84         memcpy(&get_paca()->shadow_vcpu, to_book3s(vcpu)->shadow_vcpu,
  85                sizeof(get_paca()->shadow_vcpu));
  86         to_svcpu(vcpu)->slb_max = to_book3s(vcpu)->slb_shadow_max;
  87 #endif
  88
  89 #ifdef CONFIG_PPC_BOOK3S_32
  90         current->thread.kvm_shadow_vcpu = to_book3s(vcpu)->shadow_vcpu;
  91 #endif
  92 }
  93
  94 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  95 {
  96 #ifdef CONFIG_PPC_BOOK3S_64
  97         memcpy(to_book3s(vcpu)->slb_shadow, to_svcpu(vcpu)->slb, sizeof(to_svcpu(vcpu)->slb));
  98         memcpy(to_book3s(vcpu)->shadow_vcpu, &get_paca()->shadow_vcpu,
  99                sizeof(get_paca()->shadow_vcpu));
 100         to_book3s(vcpu)->slb_shadow_max = to_svcpu(vcpu)->slb_max;
 101 #endif
 102
 103         kvmppc_giveup_ext(vcpu, MSR_FP);
 104         kvmppc_giveup_ext(vcpu, MSR_VEC);
 105         kvmppc_giveup_ext(vcpu, MSR_VSX);
 106 }
 107
 108 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
 109 {
 110         ulong smsr = vcpu->arch.shared->msr;
 111
 112         /* Guest MSR values */
 113         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_DE;
 114         /* Process MSR values */
 115         smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
 116         /* External providers the guest reserved */
 117         smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
 118         /* 64-bit Process MSR values */
 119 #ifdef CONFIG_PPC_BOOK3S_64
 120         smsr |= MSR_ISF | MSR_HV;
 121 #endif
 122         vcpu->arch.shadow_msr = smsr;
 123 }
 124
 125 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
 126 {
 127         ulong old_msr = vcpu->arch.shared->msr;
 128
 129 #ifdef EXIT_DEBUG
 130         printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
 131 #endif
 132
 133         msr &= to_book3s(vcpu)->msr_mask;
 134         vcpu->arch.shared->msr = msr;
 135         kvmppc_recalc_shadow_msr(vcpu);
 136
 137         if (msr & MSR_POW) {
 138                 if (!vcpu->arch.pending_exceptions) {
 139                         kvm_vcpu_block(vcpu);
 140                         vcpu->stat.halt_wakeup++;
 141
 142                         /* Unset POW bit after we woke up */
 143                         msr &= ~MSR_POW;
 144                         vcpu->arch.shared->msr = msr;
 145                 }
 146         }
 147
 148         if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
 149                    (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
 150                 kvmppc_mmu_flush_segments(vcpu);
 151                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 152
 153                 /* Preload magic page segment when in kernel mode */
 154                 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
 155                         struct kvm_vcpu_arch *a = &vcpu->arch;
 156
 157                         if (msr & MSR_DR)
 158                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
 159                         else
 160                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
 161                 }
 162         }
 163
 164         /* Preload FPU if it's enabled */
 165         if (vcpu->arch.shared->msr & MSR_FP)
 166                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 167 }
 168
 169 void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags)
 170 {
 171         vcpu->arch.shared->srr0 = kvmppc_get_pc(vcpu);
 172         vcpu->arch.shared->srr1 = vcpu->arch.shared->msr | flags;
 173         kvmppc_set_pc(vcpu, to_book3s(vcpu)->hior + vec);
 174         vcpu->arch.mmu.reset_msr(vcpu);
 175 }
 176
 177 static int kvmppc_book3s_vec2irqprio(unsigned int vec)
 178 {
 179         unsigned int prio;
 180
 181         switch (vec) {
 182         case 0x100: prio = BOOK3S_IRQPRIO_SYSTEM_RESET;         break;
 183         case 0x200: prio = BOOK3S_IRQPRIO_MACHINE_CHECK;        break;
 184         case 0x300: prio = BOOK3S_IRQPRIO_DATA_STORAGE;         break;
 185         case 0x380: prio = BOOK3S_IRQPRIO_DATA_SEGMENT;         break;
 186         case 0x400: prio = BOOK3S_IRQPRIO_INST_STORAGE;         break;
 187         case 0x480: prio = BOOK3S_IRQPRIO_INST_SEGMENT;         break;
 188         case 0x500: prio = BOOK3S_IRQPRIO_EXTERNAL;             break;
 189         case 0x501: prio = BOOK3S_IRQPRIO_EXTERNAL_LEVEL;       break;
 190         case 0x600: prio = BOOK3S_IRQPRIO_ALIGNMENT;            break;
 191         case 0x700: prio = BOOK3S_IRQPRIO_PROGRAM;              break;
 192         case 0x800: prio = BOOK3S_IRQPRIO_FP_UNAVAIL;           break;
 193         case 0x900: prio = BOOK3S_IRQPRIO_DECREMENTER;          break;
 194         case 0xc00: prio = BOOK3S_IRQPRIO_SYSCALL;              break;
 195         case 0xd00: prio = BOOK3S_IRQPRIO_DEBUG;                break;
 196         case 0xf20: prio = BOOK3S_IRQPRIO_ALTIVEC;              break;
 197         case 0xf40: prio = BOOK3S_IRQPRIO_VSX;                  break;
 198         default:    prio = BOOK3S_IRQPRIO_MAX;                  break;
 199         }
 200
 201         return prio;
 202 }
 203
 204 static void kvmppc_book3s_dequeue_irqprio(struct kvm_vcpu *vcpu,
 205                                           unsigned int vec)
 206 {
 207         clear_bit(kvmppc_book3s_vec2irqprio(vec),
 208                   &vcpu->arch.pending_exceptions);
 209
 210         if (!vcpu->arch.pending_exceptions)
 211                 vcpu->arch.shared->int_pending = 0;
 212 }
 213
 214 void kvmppc_book3s_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int vec)
 215 {
 216         vcpu->stat.queue_intr++;
 217
 218         set_bit(kvmppc_book3s_vec2irqprio(vec),
 219                 &vcpu->arch.pending_exceptions);
 220 #ifdef EXIT_DEBUG
 221         printk(KERN_INFO "Queueing interrupt %x\n", vec);
 222 #endif
 223 }
 224
 225
 226 void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong flags)
 227 {
 228         to_book3s(vcpu)->prog_flags = flags;
 229         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_PROGRAM);
 230 }
 231
 232 void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
 233 {
 234         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_DECREMENTER);
 235 }
 236
 237 int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
 238 {
 239         return test_bit(BOOK3S_INTERRUPT_DECREMENTER >> 7, &vcpu->arch.pending_exceptions);
 240 }
 241
 242 void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu)
 243 {
 244         kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_DECREMENTER);
 245 }
 246
 247 void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
 248                                 struct kvm_interrupt *irq)
 249 {
 250         unsigned int vec = BOOK3S_INTERRUPT_EXTERNAL;
 251
 252         if (irq->irq == KVM_INTERRUPT_SET_LEVEL)
 253                 vec = BOOK3S_INTERRUPT_EXTERNAL_LEVEL;
 254
 255         kvmppc_book3s_queue_irqprio(vcpu, vec);
 256 }
 257
 258 void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu,
 259                                   struct kvm_interrupt *irq)
 260 {
 261         kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL);
 262         kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
 263 }
 264
 265 int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
 266 {
 267         int deliver = 1;
 268         int vec = 0;
 269         ulong flags = 0ULL;
 270         ulong crit_raw = vcpu->arch.shared->critical;
 271         ulong crit_r1 = kvmppc_get_gpr(vcpu, 1);
 272         bool crit;
 273
 274         /* Truncate crit indicators in 32 bit mode */
 275         if (!(vcpu->arch.shared->msr & MSR_SF)) {
 276                 crit_raw &= 0xffffffff;
 277                 crit_r1 &= 0xffffffff;
 278         }
 279
 280         /* Critical section when crit == r1 */
 281         crit = (crit_raw == crit_r1);
 282         /* ... and we're in supervisor mode */
 283         crit = crit && !(vcpu->arch.shared->msr & MSR_PR);
 284
 285         switch (priority) {
 286         case BOOK3S_IRQPRIO_DECREMENTER:
 287                 deliver = (vcpu->arch.shared->msr & MSR_EE) && !crit;
 288                 vec = BOOK3S_INTERRUPT_DECREMENTER;
 289                 break;
 290         case BOOK3S_IRQPRIO_EXTERNAL:
 291         case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
 292                 deliver = (vcpu->arch.shared->msr & MSR_EE) && !crit;
 293                 vec = BOOK3S_INTERRUPT_EXTERNAL;
 294                 break;
 295         case BOOK3S_IRQPRIO_SYSTEM_RESET:
 296                 vec = BOOK3S_INTERRUPT_SYSTEM_RESET;
 297                 break;
 298         case BOOK3S_IRQPRIO_MACHINE_CHECK:
 299                 vec = BOOK3S_INTERRUPT_MACHINE_CHECK;
 300                 break;
 301         case BOOK3S_IRQPRIO_DATA_STORAGE:
 302                 vec = BOOK3S_INTERRUPT_DATA_STORAGE;
 303                 break;
 304         case BOOK3S_IRQPRIO_INST_STORAGE:
 305                 vec = BOOK3S_INTERRUPT_INST_STORAGE;
 306                 break;
 307         case BOOK3S_IRQPRIO_DATA_SEGMENT:
 308                 vec = BOOK3S_INTERRUPT_DATA_SEGMENT;
 309                 break;
 310         case BOOK3S_IRQPRIO_INST_SEGMENT:
 311                 vec = BOOK3S_INTERRUPT_INST_SEGMENT;
 312                 break;
 313         case BOOK3S_IRQPRIO_ALIGNMENT:
 314                 vec = BOOK3S_INTERRUPT_ALIGNMENT;
 315                 break;
 316         case BOOK3S_IRQPRIO_PROGRAM:
 317                 vec = BOOK3S_INTERRUPT_PROGRAM;
 318                 flags = to_book3s(vcpu)->prog_flags;
 319                 break;
 320         case BOOK3S_IRQPRIO_VSX:
 321                 vec = BOOK3S_INTERRUPT_VSX;
 322                 break;
 323         case BOOK3S_IRQPRIO_ALTIVEC:
 324                 vec = BOOK3S_INTERRUPT_ALTIVEC;
 325                 break;
 326         case BOOK3S_IRQPRIO_FP_UNAVAIL:
 327                 vec = BOOK3S_INTERRUPT_FP_UNAVAIL;
 328                 break;
 329         case BOOK3S_IRQPRIO_SYSCALL:
 330                 vec = BOOK3S_INTERRUPT_SYSCALL;
 331                 break;
 332         case BOOK3S_IRQPRIO_DEBUG:
 333                 vec = BOOK3S_INTERRUPT_TRACE;
 334                 break;
 335         case BOOK3S_IRQPRIO_PERFORMANCE_MONITOR:
 336                 vec = BOOK3S_INTERRUPT_PERFMON;
 337                 break;
 338         default:
 339                 deliver = 0;
 340                 printk(KERN_ERR "KVM: Unknown interrupt: 0x%x\n", priority);
 341                 break;
 342         }
 343
 344 #if 0
 345         printk(KERN_INFO "Deliver interrupt 0x%x? %x\n", vec, deliver);
 346 #endif
 347
 348         if (deliver)
 349                 kvmppc_inject_interrupt(vcpu, vec, flags);
 350
 351         return deliver;
 352 }
 353
 354 /*
 355  * This function determines if an irqprio should be cleared once issued.
 356  */
 357 static bool clear_irqprio(struct kvm_vcpu *vcpu, unsigned int priority)
 358 {
 359         switch (priority) {
 360                 case BOOK3S_IRQPRIO_DECREMENTER:
 361                         /* DEC interrupts get cleared by mtdec */
 362                         return false;
 363                 case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
 364                         /* External interrupts get cleared by userspace */
 365                         return false;
 366         }
 367
 368         return true;
 369 }
 370
 371 void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
 372 {
 373         unsigned long *pending = &vcpu->arch.pending_exceptions;
 374         unsigned long old_pending = vcpu->arch.pending_exceptions;
 375         unsigned int priority;
 376
 377 #ifdef EXIT_DEBUG
 378         if (vcpu->arch.pending_exceptions)
 379                 printk(KERN_EMERG "KVM: Check pending: %lx\n", vcpu->arch.pending_exceptions);
 380 #endif
 381         priority = __ffs(*pending);
 382         while (priority < BOOK3S_IRQPRIO_MAX) {
 383                 if (kvmppc_book3s_irqprio_deliver(vcpu, priority) &&
 384                     clear_irqprio(vcpu, priority)) {
 385                         clear_bit(priority, &vcpu->arch.pending_exceptions);
 386                         break;
 387                 }
 388
 389                 priority = find_next_bit(pending,
 390                                          BITS_PER_BYTE * sizeof(*pending),
 391                                          priority + 1);
 392         }
 393
 394         /* Tell the guest about our interrupt status */
 395         if (*pending)
 396                 vcpu->arch.shared->int_pending = 1;
 397         else if (old_pending)
 398                 vcpu->arch.shared->int_pending = 0;
 399 }
 400
 401 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
 402 {
 403         u32 host_pvr;
 404
 405         vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
 406         vcpu->arch.pvr = pvr;
 407 #ifdef CONFIG_PPC_BOOK3S_64
 408         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
 409                 kvmppc_mmu_book3s_64_init(vcpu);
 410                 to_book3s(vcpu)->hior = 0xfff00000;
 411                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
 412         } else
 413 #endif
 414         {
 415                 kvmppc_mmu_book3s_32_init(vcpu);
 416                 to_book3s(vcpu)->hior = 0;
 417                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
 418         }
 419
 420         /* If we are in hypervisor level on 970, we can tell the CPU to
 421          * treat DCBZ as 32 bytes store */
 422         vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
 423         if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
 424             !strcmp(cur_cpu_spec->platform, "ppc970"))
 425                 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 426
 427         /* Cell performs badly if MSR_FEx are set. So let's hope nobody
 428            really needs them in a VM on Cell and force disable them. */
 429         if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
 430                 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
 431
 432 #ifdef CONFIG_PPC_BOOK3S_32
 433         /* 32 bit Book3S always has 32 byte dcbz */
 434         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 435 #endif
 436
 437         /* On some CPUs we can execute paired single operations natively */
 438         asm ( "mfpvr %0" : "=r"(host_pvr));
 439         switch (host_pvr) {
 440         case 0x00080200:        /* lonestar 2.0 */
 441         case 0x00088202:        /* lonestar 2.2 */
 442         case 0x70000100:        /* gekko 1.0 */
 443         case 0x00080100:        /* gekko 2.0 */
 444         case 0x00083203:        /* gekko 2.3a */
 445         case 0x00083213:        /* gekko 2.3b */
 446         case 0x00083204:        /* gekko 2.4 */
 447         case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
 448         case 0x00087200:        /* broadway */
 449                 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
 450                 /* Enable HID2.PSE - in case we need it later */
 451                 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
 452         }
 453 }
 454
 455 pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 456 {
 457         ulong mp_pa = vcpu->arch.magic_page_pa;
 458
 459         /* Magic page override */
 460         if (unlikely(mp_pa) &&
 461             unlikely(((gfn << PAGE_SHIFT) & KVM_PAM) ==
 462                      ((mp_pa & PAGE_MASK) & KVM_PAM))) {
 463                 ulong shared_page = ((ulong)vcpu->arch.shared) & PAGE_MASK;
 464                 pfn_t pfn;
 465
 466                 pfn = (pfn_t)virt_to_phys((void*)shared_page) >> PAGE_SHIFT;
 467                 get_page(pfn_to_page(pfn));
 468                 return pfn;
 469         }
 470
 471         return gfn_to_pfn(vcpu->kvm, gfn);
 472 }
 473
 474 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
 475  * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
 476  * emulate 32 bytes dcbz length.
 477  *
 478  * The Book3s_64 inventors also realized this case and implemented a special bit
 479  * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
 480  *
 481  * My approach here is to patch the dcbz instruction on executing pages.
 482  */
 483 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 484 {
 485         struct page *hpage;
 486         u64 hpage_offset;
 487         u32 *page;
 488         int i;
 489
 490         hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 491         if (is_error_page(hpage)) {
 492                 kvm_release_page_clean(hpage);
 493                 return;
 494         }
 495
 496         hpage_offset = pte->raddr & ~PAGE_MASK;
 497         hpage_offset &= ~0xFFFULL;
 498         hpage_offset /= 4;
 499
 500         get_page(hpage);
 501         page = kmap_atomic(hpage, KM_USER0);
 502
 503         /* patch dcbz into reserved instruction, so we trap */
 504         for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
 505                 if ((page[i] & 0xff0007ff) == INS_DCBZ)
 506                         page[i] &= 0xfffffff7;
 507
 508         kunmap_atomic(page, KM_USER0);
 509         put_page(hpage);
 510 }
 511
 512 static int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr, bool data,
 513                          struct kvmppc_pte *pte)
 514 {
 515         int relocated = (vcpu->arch.shared->msr & (data ? MSR_DR : MSR_IR));
 516         int r;
 517
 518         if (relocated) {
 519                 r = vcpu->arch.mmu.xlate(vcpu, eaddr, pte, data);
 520         } else {
 521                 pte->eaddr = eaddr;
 522                 pte->raddr = eaddr & KVM_PAM;
 523                 pte->vpage = VSID_REAL | eaddr >> 12;
 524                 pte->may_read = true;
 525                 pte->may_write = true;
 526                 pte->may_execute = true;
 527                 r = 0;
 528         }
 529
 530         return r;
 531 }
 532
 533 static hva_t kvmppc_bad_hva(void)
 534 {
 535         return PAGE_OFFSET;
 536 }
 537
 538 static hva_t kvmppc_pte_to_hva(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte,
 539                                bool read)
 540 {
 541         hva_t hpage;
 542
 543         if (read && !pte->may_read)
 544                 goto err;
 545
 546         if (!read && !pte->may_write)
 547                 goto err;
 548
 549         hpage = gfn_to_hva(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 550         if (kvm_is_error_hva(hpage))
 551                 goto err;
 552
 553         return hpage | (pte->raddr & ~PAGE_MASK);
 554 err:
 555         return kvmppc_bad_hva();
 556 }
 557
 558 int kvmppc_st(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr,
 559               bool data)
 560 {
 561         struct kvmppc_pte pte;
 562
 563         vcpu->stat.st++;
 564
 565         if (kvmppc_xlate(vcpu, *eaddr, data, &pte))
 566                 return -ENOENT;
 567
 568         *eaddr = pte.raddr;
 569
 570         if (!pte.may_write)
 571                 return -EPERM;
 572
 573         if (kvm_write_guest(vcpu->kvm, pte.raddr, ptr, size))
 574                 return EMULATE_DO_MMIO;
 575
 576         return EMULATE_DONE;
 577 }
 578
 579 int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr,
 580                       bool data)
 581 {
 582         struct kvmppc_pte pte;
 583         hva_t hva = *eaddr;
 584
 585         vcpu->stat.ld++;
 586
 587         if (kvmppc_xlate(vcpu, *eaddr, data, &pte))
 588                 goto nopte;
 589
 590         *eaddr = pte.raddr;
 591
 592         hva = kvmppc_pte_to_hva(vcpu, &pte, true);
 593         if (kvm_is_error_hva(hva))
 594                 goto mmio;
 595
 596         if (copy_from_user(ptr, (void __user *)hva, size)) {
 597                 printk(KERN_INFO "kvmppc_ld at 0x%lx failed\n", hva);
 598                 goto mmio;
 599         }
 600
 601         return EMULATE_DONE;
 602
 603 nopte:
 604         return -ENOENT;
 605 mmio:
 606         return EMULATE_DO_MMIO;
 607 }
 608
 609 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 610 {
 611         ulong mp_pa = vcpu->arch.magic_page_pa;
 612
 613         if (unlikely(mp_pa) &&
 614             unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
 615                 return 1;
 616         }
 617
 618         return kvm_is_visible_gfn(vcpu->kvm, gfn);
 619 }
 620
 621 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 622                             ulong eaddr, int vec)
 623 {
 624         bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
 625         int r = RESUME_GUEST;
 626         int relocated;
 627         int page_found = 0;
 628         struct kvmppc_pte pte;
 629         bool is_mmio = false;
 630         bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
 631         bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
 632         u64 vsid;
 633
 634         relocated = data ? dr : ir;
 635
 636         /* Resolve real address if translation turned on */
 637         if (relocated) {
 638                 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data);
 639         } else {
 640                 pte.may_execute = true;
 641                 pte.may_read = true;
 642                 pte.may_write = true;
 643                 pte.raddr = eaddr & KVM_PAM;
 644                 pte.eaddr = eaddr;
 645                 pte.vpage = eaddr >> 12;
 646         }
 647
 648         switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
 649         case 0:
 650                 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
 651                 break;
 652         case MSR_DR:
 653         case MSR_IR:
 654                 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 655
 656                 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
 657                         pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
 658                 else
 659                         pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
 660                 pte.vpage |= vsid;
 661
 662                 if (vsid == -1)
 663                         page_found = -EINVAL;
 664                 break;
 665         }
 666
 667         if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 668            (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 669                 /*
 670                  * If we do the dcbz hack, we have to NX on every execution,
 671                  * so we can patch the executing code. This renders our guest
 672                  * NX-less.
 673                  */
 674                 pte.may_execute = !data;
 675         }
 676
 677         if (page_found == -ENOENT) {
 678                 /* Page not found in guest PTE entries */
 679                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 680                 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr;
 681                 vcpu->arch.shared->msr |=
 682                         (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL);
 683                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 684         } else if (page_found == -EPERM) {
 685                 /* Storage protection */
 686                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 687                 vcpu->arch.shared->dsisr =
 688                         to_svcpu(vcpu)->fault_dsisr & ~DSISR_NOHPTE;
 689                 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
 690                 vcpu->arch.shared->msr |=
 691                         (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL);
 692                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 693         } else if (page_found == -EINVAL) {
 694                 /* Page not found in guest SLB */
 695                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 696                 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
 697         } else if (!is_mmio &&
 698                    kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
 699                 /* The guest's PTE is not mapped yet. Map on the host */
 700                 kvmppc_mmu_map_page(vcpu, &pte);
 701                 if (data)
 702                         vcpu->stat.sp_storage++;
 703                 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 704                         (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
 705                         kvmppc_patch_dcbz(vcpu, &pte);
 706         } else {
 707                 /* MMIO */
 708                 vcpu->stat.mmio_exits++;
 709                 vcpu->arch.paddr_accessed = pte.raddr;
 710                 r = kvmppc_emulate_mmio(run, vcpu);
 711                 if ( r == RESUME_HOST_NV )
 712                         r = RESUME_HOST;
 713         }
 714
 715         return r;
 716 }
 717
 718 static inline int get_fpr_index(int i)
 719 {
 720 #ifdef CONFIG_VSX
 721         i *= 2;
 722 #endif
 723         return i;
 724 }
 725
 726 /* Give up external provider (FPU, Altivec, VSX) */
 727 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
 728 {
 729         struct thread_struct *t = &current->thread;
 730         u64 *vcpu_fpr = vcpu->arch.fpr;
 731 #ifdef CONFIG_VSX
 732         u64 *vcpu_vsx = vcpu->arch.vsr;
 733 #endif
 734         u64 *thread_fpr = (u64*)t->fpr;
 735         int i;
 736
 737         if (!(vcpu->arch.guest_owned_ext & msr))
 738                 return;
 739
 740 #ifdef DEBUG_EXT
 741         printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
 742 #endif
 743
 744         switch (msr) {
 745         case MSR_FP:
 746                 giveup_fpu(current);
 747                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 748                         vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];
 749
 750                 vcpu->arch.fpscr = t->fpscr.val;
 751                 break;
 752         case MSR_VEC:
 753 #ifdef CONFIG_ALTIVEC
 754                 giveup_altivec(current);
 755                 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr));
 756                 vcpu->arch.vscr = t->vscr;
 757 #endif
 758                 break;
 759         case MSR_VSX:
 760 #ifdef CONFIG_VSX
 761                 __giveup_vsx(current);
 762                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
 763                         vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
 764 #endif
 765                 break;
 766         default:
 767                 BUG();
 768         }
 769
 770         vcpu->arch.guest_owned_ext &= ~msr;
 771         current->thread.regs->msr &= ~msr;
 772         kvmppc_recalc_shadow_msr(vcpu);
 773 }
 774
 775 static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
 776 {
 777         ulong srr0 = kvmppc_get_pc(vcpu);
 778         u32 last_inst = kvmppc_get_last_inst(vcpu);
 779         int ret;
 780
 781         ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
 782         if (ret == -ENOENT) {
 783                 ulong msr = vcpu->arch.shared->msr;
 784
 785                 msr = kvmppc_set_field(msr, 33, 33, 1);
 786                 msr = kvmppc_set_field(msr, 34, 36, 0);
 787                 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
 788                 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
 789                 return EMULATE_AGAIN;
 790         }
 791
 792         return EMULATE_DONE;
 793 }
 794
 795 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
 796 {
 797
 798         /* Need to do paired single emulation? */
 799         if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
 800                 return EMULATE_DONE;
 801
 802         /* Read out the instruction */
 803         if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
 804                 /* Need to emulate */
 805                 return EMULATE_FAIL;
 806
 807         return EMULATE_AGAIN;
 808 }
 809
 810 /* Handle external providers (FPU, Altivec, VSX) */
 811 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 812                              ulong msr)
 813 {
 814         struct thread_struct *t = &current->thread;
 815         u64 *vcpu_fpr = vcpu->arch.fpr;
 816 #ifdef CONFIG_VSX
 817         u64 *vcpu_vsx = vcpu->arch.vsr;
 818 #endif
 819         u64 *thread_fpr = (u64*)t->fpr;
 820         int i;
 821
 822         /* When we have paired singles, we emulate in software */
 823         if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
 824                 return RESUME_GUEST;
 825
 826         if (!(vcpu->arch.shared->msr & msr)) {
 827                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 828                 return RESUME_GUEST;
 829         }
 830
 831         /* We already own the ext */
 832         if (vcpu->arch.guest_owned_ext & msr) {
 833                 return RESUME_GUEST;
 834         }
 835
 836 #ifdef DEBUG_EXT
 837         printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
 838 #endif
 839
 840         current->thread.regs->msr |= msr;
 841
 842         switch (msr) {
 843         case MSR_FP:
 844                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 845                         thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
 846
 847                 t->fpscr.val = vcpu->arch.fpscr;
 848                 t->fpexc_mode = 0;
 849                 kvmppc_load_up_fpu();
 850                 break;
 851         case MSR_VEC:
 852 #ifdef CONFIG_ALTIVEC
 853                 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
 854                 t->vscr = vcpu->arch.vscr;
 855                 t->vrsave = -1;
 856                 kvmppc_load_up_altivec();
 857 #endif
 858                 break;
 859         case MSR_VSX:
 860 #ifdef CONFIG_VSX
 861                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
 862                         thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
 863                 kvmppc_load_up_vsx();
 864 #endif
 865                 break;
 866         default:
 867                 BUG();
 868         }
 869
 870         vcpu->arch.guest_owned_ext |= msr;
 871
 872         kvmppc_recalc_shadow_msr(vcpu);
 873
 874         return RESUME_GUEST;
 875 }
 876
 877 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 878                        unsigned int exit_nr)
 879 {
 880         int r = RESUME_HOST;
 881
 882         vcpu->stat.sum_exits++;
 883
 884         run->exit_reason = KVM_EXIT_UNKNOWN;
 885         run->ready_for_interrupt_injection = 1;
 886
 887         trace_kvm_book3s_exit(exit_nr, vcpu);
 888         kvm_resched(vcpu);
 889         switch (exit_nr) {
 890         case BOOK3S_INTERRUPT_INST_STORAGE:
 891                 vcpu->stat.pf_instruc++;
 892
 893 #ifdef CONFIG_PPC_BOOK3S_32
 894                 /* We set segments as unused segments when invalidating them. So
 895                  * treat the respective fault as segment fault. */
 896                 if (to_svcpu(vcpu)->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT]
 897                     == SR_INVALID) {
 898                         kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 899                         r = RESUME_GUEST;
 900                         break;
 901                 }
 902 #endif
 903
 904                 /* only care about PTEG not found errors, but leave NX alone */
 905                 if (to_svcpu(vcpu)->shadow_srr1 & 0x40000000) {
 906                         r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
 907                         vcpu->stat.sp_instruc++;
 908                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 909                           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 910                         /*
 911                          * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
 912                          *     so we can't use the NX bit inside the guest. Let's cross our fingers,
 913                          *     that no guest that needs the dcbz hack does NX.
 914                          */
 915                         kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
 916                         r = RESUME_GUEST;
 917                 } else {
 918                         vcpu->arch.shared->msr |=
 919                                 to_svcpu(vcpu)->shadow_srr1 & 0x58000000;
 920                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 921                         r = RESUME_GUEST;
 922                 }
 923                 break;
 924         case BOOK3S_INTERRUPT_DATA_STORAGE:
 925         {
 926                 ulong dar = kvmppc_get_fault_dar(vcpu);
 927                 vcpu->stat.pf_storage++;
 928
 929 #ifdef CONFIG_PPC_BOOK3S_32
 930                 /* We set segments as unused segments when invalidating them. So
 931                  * treat the respective fault as segment fault. */
 932                 if ((to_svcpu(vcpu)->sr[dar >> SID_SHIFT]) == SR_INVALID) {
 933                         kvmppc_mmu_map_segment(vcpu, dar);
 934                         r = RESUME_GUEST;
 935                         break;
 936                 }
 937 #endif
 938
 939                 /* The only case we need to handle is missing shadow PTEs */
 940                 if (to_svcpu(vcpu)->fault_dsisr & DSISR_NOHPTE) {
 941                         r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
 942                 } else {
 943                         vcpu->arch.shared->dar = dar;
 944                         vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr;
 945                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 946                         r = RESUME_GUEST;
 947                 }
 948                 break;
 949         }
 950         case BOOK3S_INTERRUPT_DATA_SEGMENT:
 951                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
 952                         vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 953                         kvmppc_book3s_queue_irqprio(vcpu,
 954                                 BOOK3S_INTERRUPT_DATA_SEGMENT);
 955                 }
 956                 r = RESUME_GUEST;
 957                 break;
 958         case BOOK3S_INTERRUPT_INST_SEGMENT:
 959                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
 960                         kvmppc_book3s_queue_irqprio(vcpu,
 961                                 BOOK3S_INTERRUPT_INST_SEGMENT);
 962                 }
 963                 r = RESUME_GUEST;
 964                 break;
 965         /* We're good on these - the host merely wanted to get our attention */
 966         case BOOK3S_INTERRUPT_DECREMENTER:
 967                 vcpu->stat.dec_exits++;
 968                 r = RESUME_GUEST;
 969                 break;
 970         case BOOK3S_INTERRUPT_EXTERNAL:
 971                 vcpu->stat.ext_intr_exits++;
 972                 r = RESUME_GUEST;
 973                 break;
 974         case BOOK3S_INTERRUPT_PERFMON:
 975                 r = RESUME_GUEST;
 976                 break;
 977         case BOOK3S_INTERRUPT_PROGRAM:
 978         {
 979                 enum emulation_result er;
 980                 ulong flags;
 981
 982 program_interrupt:
 983                 flags = to_svcpu(vcpu)->shadow_srr1 & 0x1f0000ull;
 984
 985                 if (vcpu->arch.shared->msr & MSR_PR) {
 986 #ifdef EXIT_DEBUG
 987                         printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 988 #endif
 989                         if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
 990                             (INS_DCBZ & 0xfffffff7)) {
 991                                 kvmppc_core_queue_program(vcpu, flags);
 992                                 r = RESUME_GUEST;
 993                                 break;
 994                         }
 995                 }
 996
 997                 vcpu->stat.emulated_inst_exits++;
 998                 er = kvmppc_emulate_instruction(run, vcpu);
 999                 switch (er) {
1000                 case EMULATE_DONE:
1001                         r = RESUME_GUEST_NV;
1002                         break;
1003                 case EMULATE_AGAIN:
1004                         r = RESUME_GUEST;
1005                         break;
1006                 case EMULATE_FAIL:
1007                         printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
1008                                __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
1009                         kvmppc_core_queue_program(vcpu, flags);
1010                         r = RESUME_GUEST;
1011                         break;
1012                 case EMULATE_DO_MMIO:
1013                         run->exit_reason = KVM_EXIT_MMIO;
1014                         r = RESUME_HOST_NV;
1015                         break;
1016                 default:
1017                         BUG();
1018                 }
1019                 break;
1020         }
1021         case BOOK3S_INTERRUPT_SYSCALL:
1022                 if (vcpu->arch.osi_enabled &&
1023                     (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
1024                     (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
1025                         /* MOL hypercalls */
1026                         u64 *gprs = run->osi.gprs;
1027                         int i;
1028
1029                         run->exit_reason = KVM_EXIT_OSI;
1030                         for (i = 0; i < 32; i++)
1031                                 gprs[i] = kvmppc_get_gpr(vcpu, i);
1032                         vcpu->arch.osi_needed = 1;
1033                         r = RESUME_HOST_NV;
1034                 } else if (!(vcpu->arch.shared->msr & MSR_PR) &&
1035                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
1036                         /* KVM PV hypercalls */
1037                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
1038                         r = RESUME_GUEST;
1039                 } else {
1040                         /* Guest syscalls */
1041                         vcpu->stat.syscall_exits++;
1042                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1043                         r = RESUME_GUEST;
1044                 }
1045                 break;
1046         case BOOK3S_INTERRUPT_FP_UNAVAIL:
1047         case BOOK3S_INTERRUPT_ALTIVEC:
1048         case BOOK3S_INTERRUPT_VSX:
1049         {
1050                 int ext_msr = 0;
1051
1052                 switch (exit_nr) {
1053                 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP;  break;
1054                 case BOOK3S_INTERRUPT_ALTIVEC:    ext_msr = MSR_VEC; break;
1055                 case BOOK3S_INTERRUPT_VSX:        ext_msr = MSR_VSX; break;
1056                 }
1057
1058                 switch (kvmppc_check_ext(vcpu, exit_nr)) {
1059                 case EMULATE_DONE:
1060                         /* everything ok - let's enable the ext */
1061                         r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
1062                         break;
1063                 case EMULATE_FAIL:
1064                         /* we need to emulate this instruction */
1065                         goto program_interrupt;
1066                         break;
1067                 default:
1068                         /* nothing to worry about - go again */
1069                         break;
1070                 }
1071                 break;
1072         }
1073         case BOOK3S_INTERRUPT_ALIGNMENT:
1074                 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
1075                         vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
1076                                 kvmppc_get_last_inst(vcpu));
1077                         vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
1078                                 kvmppc_get_last_inst(vcpu));
1079                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1080                 }
1081                 r = RESUME_GUEST;
1082                 break;
1083         case BOOK3S_INTERRUPT_MACHINE_CHECK:
1084         case BOOK3S_INTERRUPT_TRACE:
1085                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1086                 r = RESUME_GUEST;
1087                 break;
1088         default:
1089                 /* Ugh - bork here! What did we get? */
1090                 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
1091                         exit_nr, kvmppc_get_pc(vcpu), to_svcpu(vcpu)->shadow_srr1);
1092                 r = RESUME_HOST;
1093                 BUG();
1094                 break;
1095         }
1096
1097
1098         if (!(r & RESUME_HOST)) {
1099                 /* To avoid clobbering exit_reason, only check for signals if
1100                  * we aren't already exiting to userspace for some other
1101                  * reason. */
1102                 if (signal_pending(current)) {
1103 #ifdef EXIT_DEBUG
1104                         printk(KERN_EMERG "KVM: Going back to host\n");
1105 #endif
1106                         vcpu->stat.signal_exits++;
1107                         run->exit_reason = KVM_EXIT_INTR;
1108                         r = -EINTR;
1109                 } else {
1110                         /* In case an interrupt came in that was triggered
1111                          * from userspace (like DEC), we need to check what
1112                          * to inject now! */
1113                         kvmppc_core_deliver_interrupts(vcpu);
1114                 }
1115         }
1116
1117         trace_kvm_book3s_reenter(r, vcpu);
1118
1119         return r;
1120 }
1121
1122 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1123 {
1124         return 0;
1125 }
1126
1127 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
1128 {
1129         int i;
1130
1131         regs->pc = kvmppc_get_pc(vcpu);
1132         regs->cr = kvmppc_get_cr(vcpu);
1133         regs->ctr = kvmppc_get_ctr(vcpu);
1134         regs->lr = kvmppc_get_lr(vcpu);
1135         regs->xer = kvmppc_get_xer(vcpu);
1136         regs->msr = vcpu->arch.shared->msr;
1137         regs->srr0 = vcpu->arch.shared->srr0;
1138         regs->srr1 = vcpu->arch.shared->srr1;
1139         regs->pid = vcpu->arch.pid;
1140         regs->sprg0 = vcpu->arch.shared->sprg0;
1141         regs->sprg1 = vcpu->arch.shared->sprg1;
1142         regs->sprg2 = vcpu->arch.shared->sprg2;
1143         regs->sprg3 = vcpu->arch.shared->sprg3;
1144         regs->sprg5 = vcpu->arch.sprg4;
1145         regs->sprg6 = vcpu->arch.sprg5;
1146         regs->sprg7 = vcpu->arch.sprg6;
1147
1148         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
1149                 regs->gpr[i] = kvmppc_get_gpr(vcpu, i);
1150
1151         return 0;
1152 }
1153
1154 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
1155 {
1156         int i;
1157
1158         kvmppc_set_pc(vcpu, regs->pc);
1159         kvmppc_set_cr(vcpu, regs->cr);
1160         kvmppc_set_ctr(vcpu, regs->ctr);
1161         kvmppc_set_lr(vcpu, regs->lr);
1162         kvmppc_set_xer(vcpu, regs->xer);
1163         kvmppc_set_msr(vcpu, regs->msr);
1164         vcpu->arch.shared->srr0 = regs->srr0;
1165         vcpu->arch.shared->srr1 = regs->srr1;
1166         vcpu->arch.shared->sprg0 = regs->sprg0;
1167         vcpu->arch.shared->sprg1 = regs->sprg1;
1168         vcpu->arch.shared->sprg2 = regs->sprg2;
1169         vcpu->arch.shared->sprg3 = regs->sprg3;
1170         vcpu->arch.sprg5 = regs->sprg4;
1171         vcpu->arch.sprg6 = regs->sprg5;
1172         vcpu->arch.sprg7 = regs->sprg6;
1173
1174         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
1175                 kvmppc_set_gpr(vcpu, i, regs->gpr[i]);
1176
1177         return 0;
1178 }
1179
1180 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1181                                   struct kvm_sregs *sregs)
1182 {
1183         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1184         int i;
1185
1186         sregs->pvr = vcpu->arch.pvr;
1187
1188         sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
1189         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1190                 for (i = 0; i < 64; i++) {
1191                         sregs->u.s.ppc64.slb[i].slbe = vcpu3s->slb[i].orige | i;
1192                         sregs->u.s.ppc64.slb[i].slbv = vcpu3s->slb[i].origv;
1193                 }
1194         } else {
1195                 for (i = 0; i < 16; i++)
1196                         sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];
1197
1198                 for (i = 0; i < 8; i++) {
1199                         sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
1200                         sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
1201                 }
1202         }
1203
1204         return 0;
1205 }
1206
1207 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1208                                   struct kvm_sregs *sregs)
1209 {
1210         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1211         int i;
1212
1213         kvmppc_set_pvr(vcpu, sregs->pvr);
1214
1215         vcpu3s->sdr1 = sregs->u.s.sdr1;
1216         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1217                 for (i = 0; i < 64; i++) {
1218                         vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
1219                                                     sregs->u.s.ppc64.slb[i].slbe);
1220                 }
1221         } else {
1222                 for (i = 0; i < 16; i++) {
1223                         vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
1224                 }
1225                 for (i = 0; i < 8; i++) {
1226                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
1227                                        (u32)sregs->u.s.ppc32.ibat[i]);
1228                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
1229                                        (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
1230                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
1231                                        (u32)sregs->u.s.ppc32.dbat[i]);
1232                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
1233                                        (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
1234                 }
1235         }
1236
1237         /* Flush the MMU after messing with the segments */
1238         kvmppc_mmu_pte_flush(vcpu, 0, 0);
1239
1240         return 0;
1241 }
1242
1243 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
1244 {
1245         return -ENOTSUPP;
1246 }
1247
1248 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
1249 {
1250         return -ENOTSUPP;
1251 }
1252
1253 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1254                                   struct kvm_translation *tr)
1255 {
1256         return 0;
1257 }
1258
1259 /*
1260  * Get (and clear) the dirty memory log for a memory slot.
1261  */
1262 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1263                                       struct kvm_dirty_log *log)
1264 {
1265         struct kvm_memory_slot *memslot;
1266         struct kvm_vcpu *vcpu;
1267         ulong ga, ga_end;
1268         int is_dirty = 0;
1269         int r;
1270         unsigned long n;
1271
1272         mutex_lock(&kvm->slots_lock);
1273
1274         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1275         if (r)
1276                 goto out;
1277
1278         /* If nothing is dirty, don't bother messing with page tables. */
1279         if (is_dirty) {
1280                 memslot = &kvm->memslots->memslots[log->slot];
1281
1282                 ga = memslot->base_gfn << PAGE_SHIFT;
1283                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1284
1285                 kvm_for_each_vcpu(n, vcpu, kvm)
1286                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1287
1288                 n = kvm_dirty_bitmap_bytes(memslot);
1289                 memset(memslot->dirty_bitmap, 0, n);
1290         }
1291
1292         r = 0;
1293 out:
1294         mutex_unlock(&kvm->slots_lock);
1295         return r;
1296 }
1297
1298 int kvmppc_core_check_processor_compat(void)
1299 {
1300         return 0;
1301 }
1302
1303 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
1304 {
1305         struct kvmppc_vcpu_book3s *vcpu_book3s;
1306         struct kvm_vcpu *vcpu;
1307         int err = -ENOMEM;
1308         unsigned long p;
1309
1310         vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
1311         if (!vcpu_book3s)
1312                 goto out;
1313
1314         vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *)
1315                 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
1316         if (!vcpu_book3s->shadow_vcpu)
1317                 goto free_vcpu;
1318
1319         vcpu = &vcpu_book3s->vcpu;
1320         err = kvm_vcpu_init(vcpu, kvm, id);
1321         if (err)
1322                 goto free_shadow_vcpu;
1323
1324         p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
1325         /* the real shared page fills the last 4k of our page */
1326         vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096);
1327         if (!p)
1328                 goto uninit_vcpu;
1329
1330         vcpu->arch.host_retip = kvm_return_point;
1331         vcpu->arch.host_msr = mfmsr();
1332 #ifdef CONFIG_PPC_BOOK3S_64
1333         /* default to book3s_64 (970fx) */
1334         vcpu->arch.pvr = 0x3C0301;
1335 #else
1336         /* default to book3s_32 (750) */
1337         vcpu->arch.pvr = 0x84202;
1338 #endif
1339         kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
1340         vcpu_book3s->slb_nr = 64;
1341
1342         /* remember where some real-mode handlers are */
1343         vcpu->arch.trampoline_lowmem = kvmppc_trampoline_lowmem;
1344         vcpu->arch.trampoline_enter = kvmppc_trampoline_enter;
1345         vcpu->arch.highmem_handler = (ulong)kvmppc_handler_highmem;
1346 #ifdef CONFIG_PPC_BOOK3S_64
1347         vcpu->arch.rmcall = *(ulong*)kvmppc_rmcall;
1348 #else
1349         vcpu->arch.rmcall = (ulong)kvmppc_rmcall;
1350 #endif
1351
1352         vcpu->arch.shadow_msr = MSR_USER64;
1353
1354         err = kvmppc_mmu_init(vcpu);
1355         if (err < 0)
1356                 goto uninit_vcpu;
1357
1358         return vcpu;
1359
1360 uninit_vcpu:
1361         kvm_vcpu_uninit(vcpu);
1362 free_shadow_vcpu:
1363         kfree(vcpu_book3s->shadow_vcpu);
1364 free_vcpu:
1365         vfree(vcpu_book3s);
1366 out:
1367         return ERR_PTR(err);
1368 }
1369
1370 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
1371 {
1372         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
1373
1374         free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
1375         kvm_vcpu_uninit(vcpu);
1376         kfree(vcpu_book3s->shadow_vcpu);
1377         vfree(vcpu_book3s);
1378 }
1379
1380 extern int __kvmppc_vcpu_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
1381 int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1382 {
1383         int ret;
1384         double fpr[32][TS_FPRWIDTH];
1385         unsigned int fpscr;
1386         int fpexc_mode;
1387 #ifdef CONFIG_ALTIVEC
1388         vector128 vr[32];
1389         vector128 vscr;
1390         unsigned long uninitialized_var(vrsave);
1391         int used_vr;
1392 #endif
1393 #ifdef CONFIG_VSX
1394         int used_vsr;
1395 #endif
1396         ulong ext_msr;
1397
1398         /* No need to go into the guest when all we do is going out */
1399         if (signal_pending(current)) {
1400                 kvm_run->exit_reason = KVM_EXIT_INTR;
1401                 return -EINTR;
1402         }
1403
1404         /* Save FPU state in stack */
1405         if (current->thread.regs->msr & MSR_FP)
1406                 giveup_fpu(current);
1407         memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
1408         fpscr = current->thread.fpscr.val;
1409         fpexc_mode = current->thread.fpexc_mode;
1410
1411 #ifdef CONFIG_ALTIVEC
1412         /* Save Altivec state in stack */
1413         used_vr = current->thread.used_vr;
1414         if (used_vr) {
1415                 if (current->thread.regs->msr & MSR_VEC)
1416                         giveup_altivec(current);
1417                 memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
1418                 vscr = current->thread.vscr;
1419                 vrsave = current->thread.vrsave;
1420         }
1421 #endif
1422
1423 #ifdef CONFIG_VSX
1424         /* Save VSX state in stack */
1425         used_vsr = current->thread.used_vsr;
1426         if (used_vsr && (current->thread.regs->msr & MSR_VSX))
1427                         __giveup_vsx(current);
1428 #endif
1429
1430         /* Remember the MSR with disabled extensions */
1431         ext_msr = current->thread.regs->msr;
1432
1433         /* XXX we get called with irq disabled - change that! */
1434         local_irq_enable();
1435
1436         /* Preload FPU if it's enabled */
1437         if (vcpu->arch.shared->msr & MSR_FP)
1438                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1439
1440         ret = __kvmppc_vcpu_entry(kvm_run, vcpu);
1441
1442         local_irq_disable();
1443
1444         current->thread.regs->msr = ext_msr;
1445
1446         /* Make sure we save the guest FPU/Altivec/VSX state */
1447         kvmppc_giveup_ext(vcpu, MSR_FP);
1448         kvmppc_giveup_ext(vcpu, MSR_VEC);
1449         kvmppc_giveup_ext(vcpu, MSR_VSX);
1450
1451         /* Restore FPU state from stack */
1452         memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
1453         current->thread.fpscr.val = fpscr;
1454         current->thread.fpexc_mode = fpexc_mode;
1455
1456 #ifdef CONFIG_ALTIVEC
1457         /* Restore Altivec state from stack */
1458         if (used_vr && current->thread.used_vr) {
1459                 memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
1460                 current->thread.vscr = vscr;
1461                 current->thread.vrsave = vrsave;
1462         }
1463         current->thread.used_vr = used_vr;
1464 #endif
1465
1466 #ifdef CONFIG_VSX
1467         current->thread.used_vsr = used_vsr;
1468 #endif
1469
1470         return ret;
1471 }
1472
1473 static int kvmppc_book3s_init(void)
1474 {
1475         int r;
1476
1477         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
1478                      THIS_MODULE);
1479
1480         if (r)
1481                 return r;
1482
1483         r = kvmppc_mmu_hpte_sysinit();
1484
1485         return r;
1486 }
1487
1488 static void kvmppc_book3s_exit(void)
1489 {
1490         kvmppc_mmu_hpte_sysexit();
1491         kvm_exit();
1492 }
1493
1494 module_init(kvmppc_book3s_init);
1495 module_exit(kvmppc_book3s_exit);