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 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  40 {
  41         return gfn;
  42 }
  43
  44 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  45 {
  46         return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
  47 }
  48
  49
  50 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  51 {
  52         enum emulation_result er;
  53         int r;
  54
  55         er = kvmppc_emulate_instruction(run, vcpu);
  56         switch (er) {
  57         case EMULATE_DONE:
  58                 /* Future optimization: only reload non-volatiles if they were
  59                  * actually modified. */
  60                 r = RESUME_GUEST_NV;
  61                 break;
  62         case EMULATE_DO_MMIO:
  63                 run->exit_reason = KVM_EXIT_MMIO;
  64                 /* We must reload nonvolatiles because "update" load/store
  65                  * instructions modify register state. */
  66                 /* Future optimization: only reload non-volatiles if they were
  67                  * actually modified. */
  68                 r = RESUME_HOST_NV;
  69                 break;
  70         case EMULATE_FAIL:
  71                 /* XXX Deliver Program interrupt to guest. */
  72                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  73                        vcpu->arch.last_inst);
  74                 r = RESUME_HOST;
  75                 break;
  76         default:
  77                 BUG();
  78         }
  79
  80         return r;
  81 }
  82
  83 int kvm_arch_hardware_enable(void *garbage)
  84 {
  85         return 0;
  86 }
  87
  88 void kvm_arch_hardware_disable(void *garbage)
  89 {
  90 }
  91
  92 int kvm_arch_hardware_setup(void)
  93 {
  94         return 0;
  95 }
  96
  97 void kvm_arch_hardware_unsetup(void)
  98 {
  99 }
 100
 101 void kvm_arch_check_processor_compat(void *rtn)
 102 {
 103         *(int *)rtn = kvmppc_core_check_processor_compat();
 104 }
 105
 106 struct kvm *kvm_arch_create_vm(void)
 107 {
 108         struct kvm *kvm;
 109
 110         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 111         if (!kvm)
 112                 return ERR_PTR(-ENOMEM);
 113
 114         return kvm;
 115 }
 116
 117 static void kvmppc_free_vcpus(struct kvm *kvm)
 118 {
 119         unsigned int i;
 120         struct kvm_vcpu *vcpu;
 121
 122         kvm_for_each_vcpu(i, vcpu, kvm)
 123                 kvm_arch_vcpu_free(vcpu);
 124
 125         mutex_lock(&kvm->lock);
 126         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 127                 kvm->vcpus[i] = NULL;
 128
 129         atomic_set(&kvm->online_vcpus, 0);
 130         mutex_unlock(&kvm->lock);
 131 }
 132
 133 void kvm_arch_sync_events(struct kvm *kvm)
 134 {
 135 }
 136
 137 void kvm_arch_destroy_vm(struct kvm *kvm)
 138 {
 139         kvmppc_free_vcpus(kvm);
 140         kvm_free_physmem(kvm);
 141         cleanup_srcu_struct(&kvm->srcu);
 142         kfree(kvm);
 143 }
 144
 145 int kvm_dev_ioctl_check_extension(long ext)
 146 {
 147         int r;
 148
 149         switch (ext) {
 150         case KVM_CAP_PPC_SEGSTATE:
 151         case KVM_CAP_PPC_PAIRED_SINGLES:
 152                 r = 1;
 153                 break;
 154         case KVM_CAP_COALESCED_MMIO:
 155                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 156                 break;
 157         default:
 158                 r = 0;
 159                 break;
 160         }
 161         return r;
 162
 163 }
 164
 165 long kvm_arch_dev_ioctl(struct file *filp,
 166                         unsigned int ioctl, unsigned long arg)
 167 {
 168         return -EINVAL;
 169 }
 170
 171 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 172                                    struct kvm_memory_slot *memslot,
 173                                    struct kvm_memory_slot old,
 174                                    struct kvm_userspace_memory_region *mem,
 175                                    int user_alloc)
 176 {
 177         return 0;
 178 }
 179
 180 void kvm_arch_commit_memory_region(struct kvm *kvm,
 181                struct kvm_userspace_memory_region *mem,
 182                struct kvm_memory_slot old,
 183                int user_alloc)
 184 {
 185        return;
 186 }
 187
 188
 189 void kvm_arch_flush_shadow(struct kvm *kvm)
 190 {
 191 }
 192
 193 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 194 {
 195         struct kvm_vcpu *vcpu;
 196         vcpu = kvmppc_core_vcpu_create(kvm, id);
 197         if (!IS_ERR(vcpu))
 198                 kvmppc_create_vcpu_debugfs(vcpu, id);
 199         return vcpu;
 200 }
 201
 202 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 203 {
 204         /* Make sure we're not using the vcpu anymore */
 205         hrtimer_cancel(&vcpu->arch.dec_timer);
 206         tasklet_kill(&vcpu->arch.tasklet);
 207
 208         kvmppc_remove_vcpu_debugfs(vcpu);
 209         kvmppc_core_vcpu_free(vcpu);
 210 }
 211
 212 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 213 {
 214         kvm_arch_vcpu_free(vcpu);
 215 }
 216
 217 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 218 {
 219         return kvmppc_core_pending_dec(vcpu);
 220 }
 221
 222 static void kvmppc_decrementer_func(unsigned long data)
 223 {
 224         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 225
 226         kvmppc_core_queue_dec(vcpu);
 227
 228         if (waitqueue_active(&vcpu->wq)) {
 229                 wake_up_interruptible(&vcpu->wq);
 230                 vcpu->stat.halt_wakeup++;
 231         }
 232 }
 233
 234 /*
 235  * low level hrtimer wake routine. Because this runs in hardirq context
 236  * we schedule a tasklet to do the real work.
 237  */
 238 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 239 {
 240         struct kvm_vcpu *vcpu;
 241
 242         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 243         tasklet_schedule(&vcpu->arch.tasklet);
 244
 245         return HRTIMER_NORESTART;
 246 }
 247
 248 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 249 {
 250         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 251         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 252         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 253
 254         return 0;
 255 }
 256
 257 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 258 {
 259         kvmppc_mmu_destroy(vcpu);
 260 }
 261
 262 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 263 {
 264         kvmppc_core_vcpu_load(vcpu, cpu);
 265 }
 266
 267 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 268 {
 269         kvmppc_core_vcpu_put(vcpu);
 270 }
 271
 272 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 273                                         struct kvm_guest_debug *dbg)
 274 {
 275         return -EINVAL;
 276 }
 277
 278 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 279                                      struct kvm_run *run)
 280 {
 281         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 282 }
 283
 284 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 285                                       struct kvm_run *run)
 286 {
 287         u64 gpr;
 288
 289         if (run->mmio.len > sizeof(gpr)) {
 290                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 291                 return;
 292         }
 293
 294         if (vcpu->arch.mmio_is_bigendian) {
 295                 switch (run->mmio.len) {
 296                 case 8: gpr = *(u64 *)run->mmio.data; break;
 297                 case 4: gpr = *(u32 *)run->mmio.data; break;
 298                 case 2: gpr = *(u16 *)run->mmio.data; break;
 299                 case 1: gpr = *(u8 *)run->mmio.data; break;
 300                 }
 301         } else {
 302                 /* Convert BE data from userland back to LE. */
 303                 switch (run->mmio.len) {
 304                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 305                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 306                 case 1: gpr = *(u8 *)run->mmio.data; break;
 307                 }
 308         }
 309
 310         if (vcpu->arch.mmio_sign_extend) {
 311                 switch (run->mmio.len) {
 312 #ifdef CONFIG_PPC64
 313                 case 4:
 314                         gpr = (s64)(s32)gpr;
 315                         break;
 316 #endif
 317                 case 2:
 318                         gpr = (s64)(s16)gpr;
 319                         break;
 320                 case 1:
 321                         gpr = (s64)(s8)gpr;
 322                         break;
 323                 }
 324         }
 325
 326         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 327
 328         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
 329         case KVM_REG_GPR:
 330                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 331                 break;
 332         case KVM_REG_FPR:
 333                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 334                 break;
 335         case KVM_REG_QPR:
 336                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 337                 break;
 338         case KVM_REG_FQPR:
 339                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 340                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 341                 break;
 342         default:
 343                 BUG();
 344         }
 345 }
 346
 347 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 348                        unsigned int rt, unsigned int bytes, int is_bigendian)
 349 {
 350         if (bytes > sizeof(run->mmio.data)) {
 351                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 352                        run->mmio.len);
 353         }
 354
 355         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 356         run->mmio.len = bytes;
 357         run->mmio.is_write = 0;
 358
 359         vcpu->arch.io_gpr = rt;
 360         vcpu->arch.mmio_is_bigendian = is_bigendian;
 361         vcpu->mmio_needed = 1;
 362         vcpu->mmio_is_write = 0;
 363         vcpu->arch.mmio_sign_extend = 0;
 364
 365         return EMULATE_DO_MMIO;
 366 }
 367
 368 /* Same as above, but sign extends */
 369 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 370                         unsigned int rt, unsigned int bytes, int is_bigendian)
 371 {
 372         int r;
 373
 374         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 375         vcpu->arch.mmio_sign_extend = 1;
 376
 377         return r;
 378 }
 379
 380 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 381                         u64 val, unsigned int bytes, int is_bigendian)
 382 {
 383         void *data = run->mmio.data;
 384
 385         if (bytes > sizeof(run->mmio.data)) {
 386                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 387                        run->mmio.len);
 388         }
 389
 390         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 391         run->mmio.len = bytes;
 392         run->mmio.is_write = 1;
 393         vcpu->mmio_needed = 1;
 394         vcpu->mmio_is_write = 1;
 395
 396         /* Store the value at the lowest bytes in 'data'. */
 397         if (is_bigendian) {
 398                 switch (bytes) {
 399                 case 8: *(u64 *)data = val; break;
 400                 case 4: *(u32 *)data = val; break;
 401                 case 2: *(u16 *)data = val; break;
 402                 case 1: *(u8  *)data = val; break;
 403                 }
 404         } else {
 405                 /* Store LE value into 'data'. */
 406                 switch (bytes) {
 407                 case 4: st_le32(data, val); break;
 408                 case 2: st_le16(data, val); break;
 409                 case 1: *(u8 *)data = val; break;
 410                 }
 411         }
 412
 413         return EMULATE_DO_MMIO;
 414 }
 415
 416 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 417 {
 418         int r;
 419         sigset_t sigsaved;
 420
 421         vcpu_load(vcpu);
 422
 423         if (vcpu->sigset_active)
 424                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 425
 426         if (vcpu->mmio_needed) {
 427                 if (!vcpu->mmio_is_write)
 428                         kvmppc_complete_mmio_load(vcpu, run);
 429                 vcpu->mmio_needed = 0;
 430         } else if (vcpu->arch.dcr_needed) {
 431                 if (!vcpu->arch.dcr_is_write)
 432                         kvmppc_complete_dcr_load(vcpu, run);
 433                 vcpu->arch.dcr_needed = 0;
 434         }
 435
 436         kvmppc_core_deliver_interrupts(vcpu);
 437
 438         local_irq_disable();
 439         kvm_guest_enter();
 440         r = __kvmppc_vcpu_run(run, vcpu);
 441         kvm_guest_exit();
 442         local_irq_enable();
 443
 444         if (vcpu->sigset_active)
 445                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 446
 447         vcpu_put(vcpu);
 448
 449         return r;
 450 }
 451
 452 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 453 {
 454         kvmppc_core_queue_external(vcpu, irq);
 455
 456         if (waitqueue_active(&vcpu->wq)) {
 457                 wake_up_interruptible(&vcpu->wq);
 458                 vcpu->stat.halt_wakeup++;
 459         }
 460
 461         return 0;
 462 }
 463
 464 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 465                                     struct kvm_mp_state *mp_state)
 466 {
 467         return -EINVAL;
 468 }
 469
 470 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 471                                     struct kvm_mp_state *mp_state)
 472 {
 473         return -EINVAL;
 474 }
 475
 476 long kvm_arch_vcpu_ioctl(struct file *filp,
 477                          unsigned int ioctl, unsigned long arg)
 478 {
 479         struct kvm_vcpu *vcpu = filp->private_data;
 480         void __user *argp = (void __user *)arg;
 481         long r;
 482
 483         switch (ioctl) {
 484         case KVM_INTERRUPT: {
 485                 struct kvm_interrupt irq;
 486                 r = -EFAULT;
 487                 if (copy_from_user(&irq, argp, sizeof(irq)))
 488                         goto out;
 489                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 490                 break;
 491         }
 492         default:
 493                 r = -EINVAL;
 494         }
 495
 496 out:
 497         return r;
 498 }
 499
 500 long kvm_arch_vm_ioctl(struct file *filp,
 501                        unsigned int ioctl, unsigned long arg)
 502 {
 503         long r;
 504
 505         switch (ioctl) {
 506         default:
 507                 r = -ENOTTY;
 508         }
 509
 510         return r;
 511 }
 512
 513 int kvm_arch_init(void *opaque)
 514 {
 515         return 0;
 516 }
 517
 518 void kvm_arch_exit(void)
 519 {
 520 }