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