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/export.h>
  20 #include <linux/slab.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 <asm/page.h>
  32 #include <linux/gfp.h>
  33 #include <linux/sched.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/highmem.h>
  36
  37 #include "trace.h"
  38
  39 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  40
  41 /* #define EXIT_DEBUG */
  42
  43 struct kvm_stats_debugfs_item debugfs_entries[] = {
  44         { "exits",       VCPU_STAT(sum_exits) },
  45         { "mmio",        VCPU_STAT(mmio_exits) },
  46         { "sig",         VCPU_STAT(signal_exits) },
  47         { "sysc",        VCPU_STAT(syscall_exits) },
  48         { "inst_emu",    VCPU_STAT(emulated_inst_exits) },
  49         { "dec",         VCPU_STAT(dec_exits) },
  50         { "ext_intr",    VCPU_STAT(ext_intr_exits) },
  51         { "queue_intr",  VCPU_STAT(queue_intr) },
  52         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  53         { "pf_storage",  VCPU_STAT(pf_storage) },
  54         { "sp_storage",  VCPU_STAT(sp_storage) },
  55         { "pf_instruc",  VCPU_STAT(pf_instruc) },
  56         { "sp_instruc",  VCPU_STAT(sp_instruc) },
  57         { "ld",          VCPU_STAT(ld) },
  58         { "ld_slow",     VCPU_STAT(ld_slow) },
  59         { "st",          VCPU_STAT(st) },
  60         { "st_slow",     VCPU_STAT(st_slow) },
  61         { NULL }
  62 };
  63
  64 void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
  65 {
  66 }
  67
  68 void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
  69 {
  70 }
  71
  72 void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags)
  73 {
  74         vcpu->arch.shared->srr0 = kvmppc_get_pc(vcpu);
  75         vcpu->arch.shared->srr1 = vcpu->arch.shared->msr | flags;
  76         kvmppc_set_pc(vcpu, kvmppc_interrupt_offset(vcpu) + vec);
  77         vcpu->arch.mmu.reset_msr(vcpu);
  78 }
  79
  80 static int kvmppc_book3s_vec2irqprio(unsigned int vec)
  81 {
  82         unsigned int prio;
  83
  84         switch (vec) {
  85         case 0x100: prio = BOOK3S_IRQPRIO_SYSTEM_RESET;         break;
  86         case 0x200: prio = BOOK3S_IRQPRIO_MACHINE_CHECK;        break;
  87         case 0x300: prio = BOOK3S_IRQPRIO_DATA_STORAGE;         break;
  88         case 0x380: prio = BOOK3S_IRQPRIO_DATA_SEGMENT;         break;
  89         case 0x400: prio = BOOK3S_IRQPRIO_INST_STORAGE;         break;
  90         case 0x480: prio = BOOK3S_IRQPRIO_INST_SEGMENT;         break;
  91         case 0x500: prio = BOOK3S_IRQPRIO_EXTERNAL;             break;
  92         case 0x501: prio = BOOK3S_IRQPRIO_EXTERNAL_LEVEL;       break;
  93         case 0x600: prio = BOOK3S_IRQPRIO_ALIGNMENT;            break;
  94         case 0x700: prio = BOOK3S_IRQPRIO_PROGRAM;              break;
  95         case 0x800: prio = BOOK3S_IRQPRIO_FP_UNAVAIL;           break;
  96         case 0x900: prio = BOOK3S_IRQPRIO_DECREMENTER;          break;
  97         case 0xc00: prio = BOOK3S_IRQPRIO_SYSCALL;              break;
  98         case 0xd00: prio = BOOK3S_IRQPRIO_DEBUG;                break;
  99         case 0xf20: prio = BOOK3S_IRQPRIO_ALTIVEC;              break;
 100         case 0xf40: prio = BOOK3S_IRQPRIO_VSX;                  break;
 101         default:    prio = BOOK3S_IRQPRIO_MAX;                  break;
 102         }
 103
 104         return prio;
 105 }
 106
 107 static void kvmppc_book3s_dequeue_irqprio(struct kvm_vcpu *vcpu,
 108                                           unsigned int vec)
 109 {
 110         unsigned long old_pending = vcpu->arch.pending_exceptions;
 111
 112         clear_bit(kvmppc_book3s_vec2irqprio(vec),
 113                   &vcpu->arch.pending_exceptions);
 114
 115         kvmppc_update_int_pending(vcpu, vcpu->arch.pending_exceptions,
 116                                   old_pending);
 117 }
 118
 119 void kvmppc_book3s_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int vec)
 120 {
 121         vcpu->stat.queue_intr++;
 122
 123         set_bit(kvmppc_book3s_vec2irqprio(vec),
 124                 &vcpu->arch.pending_exceptions);
 125 #ifdef EXIT_DEBUG
 126         printk(KERN_INFO "Queueing interrupt %x\n", vec);
 127 #endif
 128 }
 129
 130
 131 void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong flags)
 132 {
 133         /* might as well deliver this straight away */
 134         kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_PROGRAM, flags);
 135 }
 136
 137 void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
 138 {
 139         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_DECREMENTER);
 140 }
 141
 142 int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
 143 {
 144         return test_bit(BOOK3S_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
 145 }
 146
 147 void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu)
 148 {
 149         kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_DECREMENTER);
 150 }
 151
 152 void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
 153                                 struct kvm_interrupt *irq)
 154 {
 155         unsigned int vec = BOOK3S_INTERRUPT_EXTERNAL;
 156
 157         if (irq->irq == KVM_INTERRUPT_SET_LEVEL)
 158                 vec = BOOK3S_INTERRUPT_EXTERNAL_LEVEL;
 159
 160         kvmppc_book3s_queue_irqprio(vcpu, vec);
 161 }
 162
 163 void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu,
 164                                   struct kvm_interrupt *irq)
 165 {
 166         kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL);
 167         kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
 168 }
 169
 170 int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
 171 {
 172         int deliver = 1;
 173         int vec = 0;
 174         bool crit = kvmppc_critical_section(vcpu);
 175
 176         switch (priority) {
 177         case BOOK3S_IRQPRIO_DECREMENTER:
 178                 deliver = (vcpu->arch.shared->msr & MSR_EE) && !crit;
 179                 vec = BOOK3S_INTERRUPT_DECREMENTER;
 180                 break;
 181         case BOOK3S_IRQPRIO_EXTERNAL:
 182         case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
 183                 deliver = (vcpu->arch.shared->msr & MSR_EE) && !crit;
 184                 vec = BOOK3S_INTERRUPT_EXTERNAL;
 185                 break;
 186         case BOOK3S_IRQPRIO_SYSTEM_RESET:
 187                 vec = BOOK3S_INTERRUPT_SYSTEM_RESET;
 188                 break;
 189         case BOOK3S_IRQPRIO_MACHINE_CHECK:
 190                 vec = BOOK3S_INTERRUPT_MACHINE_CHECK;
 191                 break;
 192         case BOOK3S_IRQPRIO_DATA_STORAGE:
 193                 vec = BOOK3S_INTERRUPT_DATA_STORAGE;
 194                 break;
 195         case BOOK3S_IRQPRIO_INST_STORAGE:
 196                 vec = BOOK3S_INTERRUPT_INST_STORAGE;
 197                 break;
 198         case BOOK3S_IRQPRIO_DATA_SEGMENT:
 199                 vec = BOOK3S_INTERRUPT_DATA_SEGMENT;
 200                 break;
 201         case BOOK3S_IRQPRIO_INST_SEGMENT:
 202                 vec = BOOK3S_INTERRUPT_INST_SEGMENT;
 203                 break;
 204         case BOOK3S_IRQPRIO_ALIGNMENT:
 205                 vec = BOOK3S_INTERRUPT_ALIGNMENT;
 206                 break;
 207         case BOOK3S_IRQPRIO_PROGRAM:
 208                 vec = BOOK3S_INTERRUPT_PROGRAM;
 209                 break;
 210         case BOOK3S_IRQPRIO_VSX:
 211                 vec = BOOK3S_INTERRUPT_VSX;
 212                 break;
 213         case BOOK3S_IRQPRIO_ALTIVEC:
 214                 vec = BOOK3S_INTERRUPT_ALTIVEC;
 215                 break;
 216         case BOOK3S_IRQPRIO_FP_UNAVAIL:
 217                 vec = BOOK3S_INTERRUPT_FP_UNAVAIL;
 218                 break;
 219         case BOOK3S_IRQPRIO_SYSCALL:
 220                 vec = BOOK3S_INTERRUPT_SYSCALL;
 221                 break;
 222         case BOOK3S_IRQPRIO_DEBUG:
 223                 vec = BOOK3S_INTERRUPT_TRACE;
 224                 break;
 225         case BOOK3S_IRQPRIO_PERFORMANCE_MONITOR:
 226                 vec = BOOK3S_INTERRUPT_PERFMON;
 227                 break;
 228         default:
 229                 deliver = 0;
 230                 printk(KERN_ERR "KVM: Unknown interrupt: 0x%x\n", priority);
 231                 break;
 232         }
 233
 234 #if 0
 235         printk(KERN_INFO "Deliver interrupt 0x%x? %x\n", vec, deliver);
 236 #endif
 237
 238         if (deliver)
 239                 kvmppc_inject_interrupt(vcpu, vec, 0);
 240
 241         return deliver;
 242 }
 243
 244 /*
 245  * This function determines if an irqprio should be cleared once issued.
 246  */
 247 static bool clear_irqprio(struct kvm_vcpu *vcpu, unsigned int priority)
 248 {
 249         switch (priority) {
 250                 case BOOK3S_IRQPRIO_DECREMENTER:
 251                         /* DEC interrupts get cleared by mtdec */
 252                         return false;
 253                 case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
 254                         /* External interrupts get cleared by userspace */
 255                         return false;
 256         }
 257
 258         return true;
 259 }
 260
 261 void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
 262 {
 263         unsigned long *pending = &vcpu->arch.pending_exceptions;
 264         unsigned long old_pending = vcpu->arch.pending_exceptions;
 265         unsigned int priority;
 266
 267 #ifdef EXIT_DEBUG
 268         if (vcpu->arch.pending_exceptions)
 269                 printk(KERN_EMERG "KVM: Check pending: %lx\n", vcpu->arch.pending_exceptions);
 270 #endif
 271         priority = __ffs(*pending);
 272         while (priority < BOOK3S_IRQPRIO_MAX) {
 273                 if (kvmppc_book3s_irqprio_deliver(vcpu, priority) &&
 274                     clear_irqprio(vcpu, priority)) {
 275                         clear_bit(priority, &vcpu->arch.pending_exceptions);
 276                         break;
 277                 }
 278
 279                 priority = find_next_bit(pending,
 280                                          BITS_PER_BYTE * sizeof(*pending),
 281                                          priority + 1);
 282         }
 283
 284         /* Tell the guest about our interrupt status */
 285         kvmppc_update_int_pending(vcpu, *pending, old_pending);
 286 }
 287
 288 pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 289 {
 290         ulong mp_pa = vcpu->arch.magic_page_pa;
 291
 292         /* Magic page override */
 293         if (unlikely(mp_pa) &&
 294             unlikely(((gfn << PAGE_SHIFT) & KVM_PAM) ==
 295                      ((mp_pa & PAGE_MASK) & KVM_PAM))) {
 296                 ulong shared_page = ((ulong)vcpu->arch.shared) & PAGE_MASK;
 297                 pfn_t pfn;
 298
 299                 pfn = (pfn_t)virt_to_phys((void*)shared_page) >> PAGE_SHIFT;
 300                 get_page(pfn_to_page(pfn));
 301                 return pfn;
 302         }
 303
 304         return gfn_to_pfn(vcpu->kvm, gfn);
 305 }
 306
 307 static int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr, bool data,
 308                          struct kvmppc_pte *pte)
 309 {
 310         int relocated = (vcpu->arch.shared->msr & (data ? MSR_DR : MSR_IR));
 311         int r;
 312
 313         if (relocated) {
 314                 r = vcpu->arch.mmu.xlate(vcpu, eaddr, pte, data);
 315         } else {
 316                 pte->eaddr = eaddr;
 317                 pte->raddr = eaddr & KVM_PAM;
 318                 pte->vpage = VSID_REAL | eaddr >> 12;
 319                 pte->may_read = true;
 320                 pte->may_write = true;
 321                 pte->may_execute = true;
 322                 r = 0;
 323         }
 324
 325         return r;
 326 }
 327
 328 static hva_t kvmppc_bad_hva(void)
 329 {
 330         return PAGE_OFFSET;
 331 }
 332
 333 static hva_t kvmppc_pte_to_hva(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte,
 334                                bool read)
 335 {
 336         hva_t hpage;
 337
 338         if (read && !pte->may_read)
 339                 goto err;
 340
 341         if (!read && !pte->may_write)
 342                 goto err;
 343
 344         hpage = gfn_to_hva(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 345         if (kvm_is_error_hva(hpage))
 346                 goto err;
 347
 348         return hpage | (pte->raddr & ~PAGE_MASK);
 349 err:
 350         return kvmppc_bad_hva();
 351 }
 352
 353 int kvmppc_st(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr,
 354               bool data)
 355 {
 356         struct kvmppc_pte pte;
 357
 358         vcpu->stat.st++;
 359
 360         if (kvmppc_xlate(vcpu, *eaddr, data, &pte))
 361                 return -ENOENT;
 362
 363         *eaddr = pte.raddr;
 364
 365         if (!pte.may_write)
 366                 return -EPERM;
 367
 368         if (kvm_write_guest(vcpu->kvm, pte.raddr, ptr, size))
 369                 return EMULATE_DO_MMIO;
 370
 371         return EMULATE_DONE;
 372 }
 373
 374 int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr,
 375                       bool data)
 376 {
 377         struct kvmppc_pte pte;
 378         hva_t hva = *eaddr;
 379
 380         vcpu->stat.ld++;
 381
 382         if (kvmppc_xlate(vcpu, *eaddr, data, &pte))
 383                 goto nopte;
 384
 385         *eaddr = pte.raddr;
 386
 387         hva = kvmppc_pte_to_hva(vcpu, &pte, true);
 388         if (kvm_is_error_hva(hva))
 389                 goto mmio;
 390
 391         if (copy_from_user(ptr, (void __user *)hva, size)) {
 392                 printk(KERN_INFO "kvmppc_ld at 0x%lx failed\n", hva);
 393                 goto mmio;
 394         }
 395
 396         return EMULATE_DONE;
 397
 398 nopte:
 399         return -ENOENT;
 400 mmio:
 401         return EMULATE_DO_MMIO;
 402 }
 403
 404 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 405 {
 406         return 0;
 407 }
 408
 409 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 410 {
 411         int i;
 412
 413         regs->pc = kvmppc_get_pc(vcpu);
 414         regs->cr = kvmppc_get_cr(vcpu);
 415         regs->ctr = kvmppc_get_ctr(vcpu);
 416         regs->lr = kvmppc_get_lr(vcpu);
 417         regs->xer = kvmppc_get_xer(vcpu);
 418         regs->msr = vcpu->arch.shared->msr;
 419         regs->srr0 = vcpu->arch.shared->srr0;
 420         regs->srr1 = vcpu->arch.shared->srr1;
 421         regs->pid = vcpu->arch.pid;
 422         regs->sprg0 = vcpu->arch.shared->sprg0;
 423         regs->sprg1 = vcpu->arch.shared->sprg1;
 424         regs->sprg2 = vcpu->arch.shared->sprg2;
 425         regs->sprg3 = vcpu->arch.shared->sprg3;
 426         regs->sprg4 = vcpu->arch.sprg4;
 427         regs->sprg5 = vcpu->arch.sprg5;
 428         regs->sprg6 = vcpu->arch.sprg6;
 429         regs->sprg7 = vcpu->arch.sprg7;
 430
 431         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 432                 regs->gpr[i] = kvmppc_get_gpr(vcpu, i);
 433
 434         return 0;
 435 }
 436
 437 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 438 {
 439         int i;
 440
 441         kvmppc_set_pc(vcpu, regs->pc);
 442         kvmppc_set_cr(vcpu, regs->cr);
 443         kvmppc_set_ctr(vcpu, regs->ctr);
 444         kvmppc_set_lr(vcpu, regs->lr);
 445         kvmppc_set_xer(vcpu, regs->xer);
 446         kvmppc_set_msr(vcpu, regs->msr);
 447         vcpu->arch.shared->srr0 = regs->srr0;
 448         vcpu->arch.shared->srr1 = regs->srr1;
 449         vcpu->arch.shared->sprg0 = regs->sprg0;
 450         vcpu->arch.shared->sprg1 = regs->sprg1;
 451         vcpu->arch.shared->sprg2 = regs->sprg2;
 452         vcpu->arch.shared->sprg3 = regs->sprg3;
 453         vcpu->arch.sprg4 = regs->sprg4;
 454         vcpu->arch.sprg5 = regs->sprg5;
 455         vcpu->arch.sprg6 = regs->sprg6;
 456         vcpu->arch.sprg7 = regs->sprg7;
 457
 458         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 459                 kvmppc_set_gpr(vcpu, i, regs->gpr[i]);
 460
 461         return 0;
 462 }
 463
 464 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 465 {
 466         return -ENOTSUPP;
 467 }
 468
 469 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 470 {
 471         return -ENOTSUPP;
 472 }
 473
 474 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 475                                   struct kvm_translation *tr)
 476 {
 477         return 0;
 478 }
 479
 480 /*
 481  * Get (and clear) the dirty memory log for a memory slot.
 482  */
 483 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 484                                       struct kvm_dirty_log *log)
 485 {
 486         struct kvm_memory_slot *memslot;
 487         struct kvm_vcpu *vcpu;
 488         ulong ga, ga_end;
 489         int is_dirty = 0;
 490         int r;
 491         unsigned long n;
 492
 493         mutex_lock(&kvm->slots_lock);
 494
 495         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 496         if (r)
 497                 goto out;
 498
 499         /* If nothing is dirty, don't bother messing with page tables. */
 500         if (is_dirty) {
 501                 memslot = id_to_memslot(kvm->memslots, log->slot);
 502
 503                 ga = memslot->base_gfn << PAGE_SHIFT;
 504                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
 505
 506                 kvm_for_each_vcpu(n, vcpu, kvm)
 507                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
 508
 509                 n = kvm_dirty_bitmap_bytes(memslot);
 510                 memset(memslot->dirty_bitmap, 0, n);
 511         }
 512
 513         r = 0;
 514 out:
 515         mutex_unlock(&kvm->slots_lock);
 516         return r;
 517 }