arch/powerpc/kvm/powerpc.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright IBM Corp. 2007
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
  19  */
  20
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/kvm_host.h>
  24 #include <linux/module.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/hrtimer.h>
  27 #include <linux/fs.h>
  28 #include <linux/slab.h>
  29 #include <asm/cputable.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/kvm_ppc.h>
  32 #include <asm/tlbflush.h>
  33 #include "timing.h"
  34 #include "../mm/mmu_decl.h"
  35
  36 #define CREATE_TRACE_POINTS
  37 #include "trace.h"
  38
  39 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  40 {
  41         return !(v->arch.shared->msr & MSR_WE) ||
  42                !!(v->arch.pending_exceptions);
  43 }
  44
  45 int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
  46 {
  47         int nr = kvmppc_get_gpr(vcpu, 11);
  48         int r;
  49         unsigned long __maybe_unused param1 = kvmppc_get_gpr(vcpu, 3);
  50         unsigned long __maybe_unused param2 = kvmppc_get_gpr(vcpu, 4);
  51         unsigned long __maybe_unused param3 = kvmppc_get_gpr(vcpu, 5);
  52         unsigned long __maybe_unused param4 = kvmppc_get_gpr(vcpu, 6);
  53         unsigned long r2 = 0;
  54
  55         if (!(vcpu->arch.shared->msr & MSR_SF)) {
  56                 /* 32 bit mode */
  57                 param1 &= 0xffffffff;
  58                 param2 &= 0xffffffff;
  59                 param3 &= 0xffffffff;
  60                 param4 &= 0xffffffff;
  61         }
  62
  63         switch (nr) {
  64         case HC_VENDOR_KVM | KVM_HC_PPC_MAP_MAGIC_PAGE:
  65         {
  66                 vcpu->arch.magic_page_pa = param1;
  67                 vcpu->arch.magic_page_ea = param2;
  68
  69                 r2 = KVM_MAGIC_FEAT_SR;
  70
  71                 r = HC_EV_SUCCESS;
  72                 break;
  73         }
  74         case HC_VENDOR_KVM | KVM_HC_FEATURES:
  75                 r = HC_EV_SUCCESS;
  76 #if defined(CONFIG_PPC_BOOK3S) /* XXX Missing magic page on BookE */
  77                 r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
  78 #endif
  79
  80                 /* Second return value is in r4 */
  81                 break;
  82         default:
  83                 r = HC_EV_UNIMPLEMENTED;
  84                 break;
  85         }
  86
  87         kvmppc_set_gpr(vcpu, 4, r2);
  88
  89         return r;
  90 }
  91
  92 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  93 {
  94         enum emulation_result er;
  95         int r;
  96
  97         er = kvmppc_emulate_instruction(run, vcpu);
  98         switch (er) {
  99         case EMULATE_DONE:
 100                 /* Future optimization: only reload non-volatiles if they were
 101                  * actually modified. */
 102                 r = RESUME_GUEST_NV;
 103                 break;
 104         case EMULATE_DO_MMIO:
 105                 run->exit_reason = KVM_EXIT_MMIO;
 106                 /* We must reload nonvolatiles because "update" load/store
 107                  * instructions modify register state. */
 108                 /* Future optimization: only reload non-volatiles if they were
 109                  * actually modified. */
 110                 r = RESUME_HOST_NV;
 111                 break;
 112         case EMULATE_FAIL:
 113                 /* XXX Deliver Program interrupt to guest. */
 114                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
 115                        kvmppc_get_last_inst(vcpu));
 116                 r = RESUME_HOST;
 117                 break;
 118         default:
 119                 BUG();
 120         }
 121
 122         return r;
 123 }
 124
 125 int kvm_arch_hardware_enable(void *garbage)
 126 {
 127         return 0;
 128 }
 129
 130 void kvm_arch_hardware_disable(void *garbage)
 131 {
 132 }
 133
 134 int kvm_arch_hardware_setup(void)
 135 {
 136         return 0;
 137 }
 138
 139 void kvm_arch_hardware_unsetup(void)
 140 {
 141 }
 142
 143 void kvm_arch_check_processor_compat(void *rtn)
 144 {
 145         *(int *)rtn = kvmppc_core_check_processor_compat();
 146 }
 147
 148 struct kvm *kvm_arch_create_vm(void)
 149 {
 150         struct kvm *kvm;
 151
 152         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 153         if (!kvm)
 154                 return ERR_PTR(-ENOMEM);
 155
 156         return kvm;
 157 }
 158
 159 static void kvmppc_free_vcpus(struct kvm *kvm)
 160 {
 161         unsigned int i;
 162         struct kvm_vcpu *vcpu;
 163
 164         kvm_for_each_vcpu(i, vcpu, kvm)
 165                 kvm_arch_vcpu_free(vcpu);
 166
 167         mutex_lock(&kvm->lock);
 168         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 169                 kvm->vcpus[i] = NULL;
 170
 171         atomic_set(&kvm->online_vcpus, 0);
 172         mutex_unlock(&kvm->lock);
 173 }
 174
 175 void kvm_arch_sync_events(struct kvm *kvm)
 176 {
 177 }
 178
 179 void kvm_arch_destroy_vm(struct kvm *kvm)
 180 {
 181         kvmppc_free_vcpus(kvm);
 182         kvm_free_physmem(kvm);
 183         cleanup_srcu_struct(&kvm->srcu);
 184         kfree(kvm);
 185 }
 186
 187 int kvm_dev_ioctl_check_extension(long ext)
 188 {
 189         int r;
 190
 191         switch (ext) {
 192         case KVM_CAP_PPC_SEGSTATE:
 193         case KVM_CAP_PPC_PAIRED_SINGLES:
 194         case KVM_CAP_PPC_UNSET_IRQ:
 195         case KVM_CAP_PPC_IRQ_LEVEL:
 196         case KVM_CAP_ENABLE_CAP:
 197         case KVM_CAP_PPC_OSI:
 198         case KVM_CAP_PPC_GET_PVINFO:
 199                 r = 1;
 200                 break;
 201         case KVM_CAP_COALESCED_MMIO:
 202                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 203                 break;
 204         default:
 205                 r = 0;
 206                 break;
 207         }
 208         return r;
 209
 210 }
 211
 212 long kvm_arch_dev_ioctl(struct file *filp,
 213                         unsigned int ioctl, unsigned long arg)
 214 {
 215         return -EINVAL;
 216 }
 217
 218 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 219                                    struct kvm_memory_slot *memslot,
 220                                    struct kvm_memory_slot old,
 221                                    struct kvm_userspace_memory_region *mem,
 222                                    int user_alloc)
 223 {
 224         return 0;
 225 }
 226
 227 void kvm_arch_commit_memory_region(struct kvm *kvm,
 228                struct kvm_userspace_memory_region *mem,
 229                struct kvm_memory_slot old,
 230                int user_alloc)
 231 {
 232        return;
 233 }
 234
 235
 236 void kvm_arch_flush_shadow(struct kvm *kvm)
 237 {
 238 }
 239
 240 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 241 {
 242         struct kvm_vcpu *vcpu;
 243         vcpu = kvmppc_core_vcpu_create(kvm, id);
 244         if (!IS_ERR(vcpu))
 245                 kvmppc_create_vcpu_debugfs(vcpu, id);
 246         return vcpu;
 247 }
 248
 249 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 250 {
 251         /* Make sure we're not using the vcpu anymore */
 252         hrtimer_cancel(&vcpu->arch.dec_timer);
 253         tasklet_kill(&vcpu->arch.tasklet);
 254
 255         kvmppc_remove_vcpu_debugfs(vcpu);
 256         kvmppc_core_vcpu_free(vcpu);
 257 }
 258
 259 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 260 {
 261         kvm_arch_vcpu_free(vcpu);
 262 }
 263
 264 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 265 {
 266         return kvmppc_core_pending_dec(vcpu);
 267 }
 268
 269 static void kvmppc_decrementer_func(unsigned long data)
 270 {
 271         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 272
 273         kvmppc_core_queue_dec(vcpu);
 274
 275         if (waitqueue_active(&vcpu->wq)) {
 276                 wake_up_interruptible(&vcpu->wq);
 277                 vcpu->stat.halt_wakeup++;
 278         }
 279 }
 280
 281 /*
 282  * low level hrtimer wake routine. Because this runs in hardirq context
 283  * we schedule a tasklet to do the real work.
 284  */
 285 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 286 {
 287         struct kvm_vcpu *vcpu;
 288
 289         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 290         tasklet_schedule(&vcpu->arch.tasklet);
 291
 292         return HRTIMER_NORESTART;
 293 }
 294
 295 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 296 {
 297         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 298         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 299         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 300
 301         return 0;
 302 }
 303
 304 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 305 {
 306         kvmppc_mmu_destroy(vcpu);
 307 }
 308
 309 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 310 {
 311         kvmppc_core_vcpu_load(vcpu, cpu);
 312 }
 313
 314 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 315 {
 316         kvmppc_core_vcpu_put(vcpu);
 317 }
 318
 319 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 320                                         struct kvm_guest_debug *dbg)
 321 {
 322         return -EINVAL;
 323 }
 324
 325 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 326                                      struct kvm_run *run)
 327 {
 328         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 329 }
 330
 331 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 332                                       struct kvm_run *run)
 333 {
 334         u64 uninitialized_var(gpr);
 335
 336         if (run->mmio.len > sizeof(gpr)) {
 337                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 338                 return;
 339         }
 340
 341         if (vcpu->arch.mmio_is_bigendian) {
 342                 switch (run->mmio.len) {
 343                 case 8: gpr = *(u64 *)run->mmio.data; break;
 344                 case 4: gpr = *(u32 *)run->mmio.data; break;
 345                 case 2: gpr = *(u16 *)run->mmio.data; break;
 346                 case 1: gpr = *(u8 *)run->mmio.data; break;
 347                 }
 348         } else {
 349                 /* Convert BE data from userland back to LE. */
 350                 switch (run->mmio.len) {
 351                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 352                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 353                 case 1: gpr = *(u8 *)run->mmio.data; break;
 354                 }
 355         }
 356
 357         if (vcpu->arch.mmio_sign_extend) {
 358                 switch (run->mmio.len) {
 359 #ifdef CONFIG_PPC64
 360                 case 4:
 361                         gpr = (s64)(s32)gpr;
 362                         break;
 363 #endif
 364                 case 2:
 365                         gpr = (s64)(s16)gpr;
 366                         break;
 367                 case 1:
 368                         gpr = (s64)(s8)gpr;
 369                         break;
 370                 }
 371         }
 372
 373         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 374
 375         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
 376         case KVM_REG_GPR:
 377                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 378                 break;
 379         case KVM_REG_FPR:
 380                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 381                 break;
 382 #ifdef CONFIG_PPC_BOOK3S
 383         case KVM_REG_QPR:
 384                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 385                 break;
 386         case KVM_REG_FQPR:
 387                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 388                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 389                 break;
 390 #endif
 391         default:
 392                 BUG();
 393         }
 394 }
 395
 396 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 397                        unsigned int rt, unsigned int bytes, int is_bigendian)
 398 {
 399         if (bytes > sizeof(run->mmio.data)) {
 400                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 401                        run->mmio.len);
 402         }
 403
 404         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 405         run->mmio.len = bytes;
 406         run->mmio.is_write = 0;
 407
 408         vcpu->arch.io_gpr = rt;
 409         vcpu->arch.mmio_is_bigendian = is_bigendian;
 410         vcpu->mmio_needed = 1;
 411         vcpu->mmio_is_write = 0;
 412         vcpu->arch.mmio_sign_extend = 0;
 413
 414         return EMULATE_DO_MMIO;
 415 }
 416
 417 /* Same as above, but sign extends */
 418 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 419                         unsigned int rt, unsigned int bytes, int is_bigendian)
 420 {
 421         int r;
 422
 423         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 424         vcpu->arch.mmio_sign_extend = 1;
 425
 426         return r;
 427 }
 428
 429 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 430                         u64 val, unsigned int bytes, int is_bigendian)
 431 {
 432         void *data = run->mmio.data;
 433
 434         if (bytes > sizeof(run->mmio.data)) {
 435                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 436                        run->mmio.len);
 437         }
 438
 439         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 440         run->mmio.len = bytes;
 441         run->mmio.is_write = 1;
 442         vcpu->mmio_needed = 1;
 443         vcpu->mmio_is_write = 1;
 444
 445         /* Store the value at the lowest bytes in 'data'. */
 446         if (is_bigendian) {
 447                 switch (bytes) {
 448                 case 8: *(u64 *)data = val; break;
 449                 case 4: *(u32 *)data = val; break;
 450                 case 2: *(u16 *)data = val; break;
 451                 case 1: *(u8  *)data = val; break;
 452                 }
 453         } else {
 454                 /* Store LE value into 'data'. */
 455                 switch (bytes) {
 456                 case 4: st_le32(data, val); break;
 457                 case 2: st_le16(data, val); break;
 458                 case 1: *(u8 *)data = val; break;
 459                 }
 460         }
 461
 462         return EMULATE_DO_MMIO;
 463 }
 464
 465 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 466 {
 467         int r;
 468         sigset_t sigsaved;
 469
 470         if (vcpu->sigset_active)
 471                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 472
 473         if (vcpu->mmio_needed) {
 474                 if (!vcpu->mmio_is_write)
 475                         kvmppc_complete_mmio_load(vcpu, run);
 476                 vcpu->mmio_needed = 0;
 477         } else if (vcpu->arch.dcr_needed) {
 478                 if (!vcpu->arch.dcr_is_write)
 479                         kvmppc_complete_dcr_load(vcpu, run);
 480                 vcpu->arch.dcr_needed = 0;
 481         } else if (vcpu->arch.osi_needed) {
 482                 u64 *gprs = run->osi.gprs;
 483                 int i;
 484
 485                 for (i = 0; i < 32; i++)
 486                         kvmppc_set_gpr(vcpu, i, gprs[i]);
 487                 vcpu->arch.osi_needed = 0;
 488         }
 489
 490         kvmppc_core_deliver_interrupts(vcpu);
 491
 492         local_irq_disable();
 493         kvm_guest_enter();
 494         r = __kvmppc_vcpu_run(run, vcpu);
 495         kvm_guest_exit();
 496         local_irq_enable();
 497
 498         if (vcpu->sigset_active)
 499                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 500
 501         return r;
 502 }
 503
 504 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 505 {
 506         if (irq->irq == KVM_INTERRUPT_UNSET)
 507                 kvmppc_core_dequeue_external(vcpu, irq);
 508         else
 509                 kvmppc_core_queue_external(vcpu, irq);
 510
 511         if (waitqueue_active(&vcpu->wq)) {
 512                 wake_up_interruptible(&vcpu->wq);
 513                 vcpu->stat.halt_wakeup++;
 514         }
 515
 516         return 0;
 517 }
 518
 519 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 520                                      struct kvm_enable_cap *cap)
 521 {
 522         int r;
 523
 524         if (cap->flags)
 525                 return -EINVAL;
 526
 527         switch (cap->cap) {
 528         case KVM_CAP_PPC_OSI:
 529                 r = 0;
 530                 vcpu->arch.osi_enabled = true;
 531                 break;
 532         default:
 533                 r = -EINVAL;
 534                 break;
 535         }
 536
 537         return r;
 538 }
 539
 540 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 541                                     struct kvm_mp_state *mp_state)
 542 {
 543         return -EINVAL;
 544 }
 545
 546 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 547                                     struct kvm_mp_state *mp_state)
 548 {
 549         return -EINVAL;
 550 }
 551
 552 long kvm_arch_vcpu_ioctl(struct file *filp,
 553                          unsigned int ioctl, unsigned long arg)
 554 {
 555         struct kvm_vcpu *vcpu = filp->private_data;
 556         void __user *argp = (void __user *)arg;
 557         long r;
 558
 559         switch (ioctl) {
 560         case KVM_INTERRUPT: {
 561                 struct kvm_interrupt irq;
 562                 r = -EFAULT;
 563                 if (copy_from_user(&irq, argp, sizeof(irq)))
 564                         goto out;
 565                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 566                 goto out;
 567         }
 568
 569         case KVM_ENABLE_CAP:
 570         {
 571                 struct kvm_enable_cap cap;
 572                 r = -EFAULT;
 573                 if (copy_from_user(&cap, argp, sizeof(cap)))
 574                         goto out;
 575                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 576                 break;
 577         }
 578         default:
 579                 r = -EINVAL;
 580         }
 581
 582 out:
 583         return r;
 584 }
 585
 586 static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
 587 {
 588         u32 inst_lis = 0x3c000000;
 589         u32 inst_ori = 0x60000000;
 590         u32 inst_nop = 0x60000000;
 591         u32 inst_sc = 0x44000002;
 592         u32 inst_imm_mask = 0xffff;
 593
 594         /*
 595          * The hypercall to get into KVM from within guest context is as
 596          * follows:
 597          *
 598          *    lis r0, r0, KVM_SC_MAGIC_R0@h
 599          *    ori r0, KVM_SC_MAGIC_R0@l
 600          *    sc
 601          *    nop
 602          */
 603         pvinfo->hcall[0] = inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask);
 604         pvinfo->hcall[1] = inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask);
 605         pvinfo->hcall[2] = inst_sc;
 606         pvinfo->hcall[3] = inst_nop;
 607
 608         return 0;
 609 }
 610
 611 long kvm_arch_vm_ioctl(struct file *filp,
 612                        unsigned int ioctl, unsigned long arg)
 613 {
 614         void __user *argp = (void __user *)arg;
 615         long r;
 616
 617         switch (ioctl) {
 618         case KVM_PPC_GET_PVINFO: {
 619                 struct kvm_ppc_pvinfo pvinfo;
 620                 memset(&pvinfo, 0, sizeof(pvinfo));
 621                 r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
 622                 if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
 623                         r = -EFAULT;
 624                         goto out;
 625                 }
 626
 627                 break;
 628         }
 629         default:
 630                 r = -ENOTTY;
 631         }
 632
 633 out:
 634         return r;
 635 }
 636
 637 int kvm_arch_init(void *opaque)
 638 {
 639         return 0;
 640 }
 641
 642 void kvm_arch_exit(void)
 643 {
 644 }