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   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         kvmppc_create_vcpu_debugfs(vcpu, id);
 198         return vcpu;
 199 }
 200
 201 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 202 {
 203         /* Make sure we're not using the vcpu anymore */
 204         hrtimer_cancel(&vcpu->arch.dec_timer);
 205         tasklet_kill(&vcpu->arch.tasklet);
 206
 207         kvmppc_remove_vcpu_debugfs(vcpu);
 208         kvmppc_core_vcpu_free(vcpu);
 209 }
 210
 211 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 212 {
 213         kvm_arch_vcpu_free(vcpu);
 214 }
 215
 216 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 217 {
 218         return kvmppc_core_pending_dec(vcpu);
 219 }
 220
 221 static void kvmppc_decrementer_func(unsigned long data)
 222 {
 223         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 224
 225         kvmppc_core_queue_dec(vcpu);
 226
 227         if (waitqueue_active(&vcpu->wq)) {
 228                 wake_up_interruptible(&vcpu->wq);
 229                 vcpu->stat.halt_wakeup++;
 230         }
 231 }
 232
 233 /*
 234  * low level hrtimer wake routine. Because this runs in hardirq context
 235  * we schedule a tasklet to do the real work.
 236  */
 237 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 238 {
 239         struct kvm_vcpu *vcpu;
 240
 241         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 242         tasklet_schedule(&vcpu->arch.tasklet);
 243
 244         return HRTIMER_NORESTART;
 245 }
 246
 247 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 248 {
 249         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 250         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 251         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 252
 253         return 0;
 254 }
 255
 256 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 257 {
 258         kvmppc_mmu_destroy(vcpu);
 259 }
 260
 261 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 262 {
 263         kvmppc_core_vcpu_load(vcpu, cpu);
 264 }
 265
 266 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 267 {
 268         kvmppc_core_vcpu_put(vcpu);
 269 }
 270
 271 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 272                                         struct kvm_guest_debug *dbg)
 273 {
 274         return -EINVAL;
 275 }
 276
 277 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 278                                      struct kvm_run *run)
 279 {
 280         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 281 }
 282
 283 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 284                                       struct kvm_run *run)
 285 {
 286         u64 gpr;
 287
 288         if (run->mmio.len > sizeof(gpr)) {
 289                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 290                 return;
 291         }
 292
 293         if (vcpu->arch.mmio_is_bigendian) {
 294                 switch (run->mmio.len) {
 295                 case 8: gpr = *(u64 *)run->mmio.data; break;
 296                 case 4: gpr = *(u32 *)run->mmio.data; break;
 297                 case 2: gpr = *(u16 *)run->mmio.data; break;
 298                 case 1: gpr = *(u8 *)run->mmio.data; break;
 299                 }
 300         } else {
 301                 /* Convert BE data from userland back to LE. */
 302                 switch (run->mmio.len) {
 303                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 304                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 305                 case 1: gpr = *(u8 *)run->mmio.data; break;
 306                 }
 307         }
 308
 309         if (vcpu->arch.mmio_sign_extend) {
 310                 switch (run->mmio.len) {
 311 #ifdef CONFIG_PPC64
 312                 case 4:
 313                         gpr = (s64)(s32)gpr;
 314                         break;
 315 #endif
 316                 case 2:
 317                         gpr = (s64)(s16)gpr;
 318                         break;
 319                 case 1:
 320                         gpr = (s64)(s8)gpr;
 321                         break;
 322                 }
 323         }
 324
 325         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 326
 327         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
 328         case KVM_REG_GPR:
 329                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 330                 break;
 331         case KVM_REG_FPR:
 332                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 333                 break;
 334         case KVM_REG_QPR:
 335                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 336                 break;
 337         case KVM_REG_FQPR:
 338                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 339                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 340                 break;
 341         default:
 342                 BUG();
 343         }
 344 }
 345
 346 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 347                        unsigned int rt, unsigned int bytes, int is_bigendian)
 348 {
 349         if (bytes > sizeof(run->mmio.data)) {
 350                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 351                        run->mmio.len);
 352         }
 353
 354         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 355         run->mmio.len = bytes;
 356         run->mmio.is_write = 0;
 357
 358         vcpu->arch.io_gpr = rt;
 359         vcpu->arch.mmio_is_bigendian = is_bigendian;
 360         vcpu->mmio_needed = 1;
 361         vcpu->mmio_is_write = 0;
 362         vcpu->arch.mmio_sign_extend = 0;
 363
 364         return EMULATE_DO_MMIO;
 365 }
 366
 367 /* Same as above, but sign extends */
 368 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 369                         unsigned int rt, unsigned int bytes, int is_bigendian)
 370 {
 371         int r;
 372
 373         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 374         vcpu->arch.mmio_sign_extend = 1;
 375
 376         return r;
 377 }
 378
 379 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 380                         u64 val, unsigned int bytes, int is_bigendian)
 381 {
 382         void *data = run->mmio.data;
 383
 384         if (bytes > sizeof(run->mmio.data)) {
 385                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 386                        run->mmio.len);
 387         }
 388
 389         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 390         run->mmio.len = bytes;
 391         run->mmio.is_write = 1;
 392         vcpu->mmio_needed = 1;
 393         vcpu->mmio_is_write = 1;
 394
 395         /* Store the value at the lowest bytes in 'data'. */
 396         if (is_bigendian) {
 397                 switch (bytes) {
 398                 case 8: *(u64 *)data = val; break;
 399                 case 4: *(u32 *)data = val; break;
 400                 case 2: *(u16 *)data = val; break;
 401                 case 1: *(u8  *)data = val; break;
 402                 }
 403         } else {
 404                 /* Store LE value into 'data'. */
 405                 switch (bytes) {
 406                 case 4: st_le32(data, val); break;
 407                 case 2: st_le16(data, val); break;
 408                 case 1: *(u8 *)data = val; break;
 409                 }
 410         }
 411
 412         return EMULATE_DO_MMIO;
 413 }
 414
 415 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 416 {
 417         int r;
 418         sigset_t sigsaved;
 419
 420         vcpu_load(vcpu);
 421
 422         if (vcpu->sigset_active)
 423                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 424
 425         if (vcpu->mmio_needed) {
 426                 if (!vcpu->mmio_is_write)
 427                         kvmppc_complete_mmio_load(vcpu, run);
 428                 vcpu->mmio_needed = 0;
 429         } else if (vcpu->arch.dcr_needed) {
 430                 if (!vcpu->arch.dcr_is_write)
 431                         kvmppc_complete_dcr_load(vcpu, run);
 432                 vcpu->arch.dcr_needed = 0;
 433         }
 434
 435         kvmppc_core_deliver_interrupts(vcpu);
 436
 437         local_irq_disable();
 438         kvm_guest_enter();
 439         r = __kvmppc_vcpu_run(run, vcpu);
 440         kvm_guest_exit();
 441         local_irq_enable();
 442
 443         if (vcpu->sigset_active)
 444                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 445
 446         vcpu_put(vcpu);
 447
 448         return r;
 449 }
 450
 451 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 452 {
 453         kvmppc_core_queue_external(vcpu, irq);
 454
 455         if (waitqueue_active(&vcpu->wq)) {
 456                 wake_up_interruptible(&vcpu->wq);
 457                 vcpu->stat.halt_wakeup++;
 458         }
 459
 460         return 0;
 461 }
 462
 463 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 464                                     struct kvm_mp_state *mp_state)
 465 {
 466         return -EINVAL;
 467 }
 468
 469 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 470                                     struct kvm_mp_state *mp_state)
 471 {
 472         return -EINVAL;
 473 }
 474
 475 long kvm_arch_vcpu_ioctl(struct file *filp,
 476                          unsigned int ioctl, unsigned long arg)
 477 {
 478         struct kvm_vcpu *vcpu = filp->private_data;
 479         void __user *argp = (void __user *)arg;
 480         long r;
 481
 482         switch (ioctl) {
 483         case KVM_INTERRUPT: {
 484                 struct kvm_interrupt irq;
 485                 r = -EFAULT;
 486                 if (copy_from_user(&irq, argp, sizeof(irq)))
 487                         goto out;
 488                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 489                 break;
 490         }
 491         default:
 492                 r = -EINVAL;
 493         }
 494
 495 out:
 496         return r;
 497 }
 498
 499 long kvm_arch_vm_ioctl(struct file *filp,
 500                        unsigned int ioctl, unsigned long arg)
 501 {
 502         long r;
 503
 504         switch (ioctl) {
 505         default:
 506                 r = -ENOTTY;
 507         }
 508
 509         return r;
 510 }
 511
 512 int kvm_arch_init(void *opaque)
 513 {
 514         return 0;
 515 }
 516
 517 void kvm_arch_exit(void)
 518 {
 519 }