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 <asm/cputable.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/kvm_ppc.h>
  31 #include <asm/tlbflush.h>
  32 #include "timing.h"
  33 #include "../mm/mmu_decl.h"
  34
  35 #define CREATE_TRACE_POINTS
  36 #include "trace.h"
  37
  38 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  39 {
  40         return gfn;
  41 }
  42
  43 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  44 {
  45         return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
  46 }
  47
  48
  49 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  50 {
  51         enum emulation_result er;
  52         int r;
  53
  54         er = kvmppc_emulate_instruction(run, vcpu);
  55         switch (er) {
  56         case EMULATE_DONE:
  57                 /* Future optimization: only reload non-volatiles if they were
  58                  * actually modified. */
  59                 r = RESUME_GUEST_NV;
  60                 break;
  61         case EMULATE_DO_MMIO:
  62                 run->exit_reason = KVM_EXIT_MMIO;
  63                 /* We must reload nonvolatiles because "update" load/store
  64                  * instructions modify register state. */
  65                 /* Future optimization: only reload non-volatiles if they were
  66                  * actually modified. */
  67                 r = RESUME_HOST_NV;
  68                 break;
  69         case EMULATE_FAIL:
  70                 /* XXX Deliver Program interrupt to guest. */
  71                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  72                        vcpu->arch.last_inst);
  73                 r = RESUME_HOST;
  74                 break;
  75         default:
  76                 BUG();
  77         }
  78
  79         return r;
  80 }
  81
  82 int kvm_arch_hardware_enable(void *garbage)
  83 {
  84         return 0;
  85 }
  86
  87 void kvm_arch_hardware_disable(void *garbage)
  88 {
  89 }
  90
  91 int kvm_arch_hardware_setup(void)
  92 {
  93         return 0;
  94 }
  95
  96 void kvm_arch_hardware_unsetup(void)
  97 {
  98 }
  99
 100 void kvm_arch_check_processor_compat(void *rtn)
 101 {
 102         *(int *)rtn = kvmppc_core_check_processor_compat();
 103 }
 104
 105 struct kvm *kvm_arch_create_vm(void)
 106 {
 107         struct kvm *kvm;
 108
 109         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 110         if (!kvm)
 111                 return ERR_PTR(-ENOMEM);
 112
 113         return kvm;
 114 }
 115
 116 static void kvmppc_free_vcpus(struct kvm *kvm)
 117 {
 118         unsigned int i;
 119         struct kvm_vcpu *vcpu;
 120
 121         kvm_for_each_vcpu(i, vcpu, kvm)
 122                 kvm_arch_vcpu_free(vcpu);
 123
 124         mutex_lock(&kvm->lock);
 125         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 126                 kvm->vcpus[i] = NULL;
 127
 128         atomic_set(&kvm->online_vcpus, 0);
 129         mutex_unlock(&kvm->lock);
 130 }
 131
 132 void kvm_arch_sync_events(struct kvm *kvm)
 133 {
 134 }
 135
 136 void kvm_arch_destroy_vm(struct kvm *kvm)
 137 {
 138         kvmppc_free_vcpus(kvm);
 139         kvm_free_physmem(kvm);
 140         cleanup_srcu_struct(&kvm->srcu);
 141         kfree(kvm);
 142 }
 143
 144 int kvm_dev_ioctl_check_extension(long ext)
 145 {
 146         int r;
 147
 148         switch (ext) {
 149         case KVM_CAP_PPC_SEGSTATE:
 150                 r = 1;
 151                 break;
 152         case KVM_CAP_COALESCED_MMIO:
 153                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 154                 break;
 155         default:
 156                 r = 0;
 157                 break;
 158         }
 159         return r;
 160
 161 }
 162
 163 long kvm_arch_dev_ioctl(struct file *filp,
 164                         unsigned int ioctl, unsigned long arg)
 165 {
 166         return -EINVAL;
 167 }
 168
 169 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 170                                    struct kvm_memory_slot *memslot,
 171                                    struct kvm_memory_slot old,
 172                                    struct kvm_userspace_memory_region *mem,
 173                                    int user_alloc)
 174 {
 175         return 0;
 176 }
 177
 178 void kvm_arch_commit_memory_region(struct kvm *kvm,
 179                struct kvm_userspace_memory_region *mem,
 180                struct kvm_memory_slot old,
 181                int user_alloc)
 182 {
 183        return;
 184 }
 185
 186
 187 void kvm_arch_flush_shadow(struct kvm *kvm)
 188 {
 189 }
 190
 191 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 192 {
 193         struct kvm_vcpu *vcpu;
 194         vcpu = kvmppc_core_vcpu_create(kvm, id);
 195         kvmppc_create_vcpu_debugfs(vcpu, id);
 196         return vcpu;
 197 }
 198
 199 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 200 {
 201         kvmppc_remove_vcpu_debugfs(vcpu);
 202         kvmppc_core_vcpu_free(vcpu);
 203 }
 204
 205 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 206 {
 207         kvm_arch_vcpu_free(vcpu);
 208 }
 209
 210 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 211 {
 212         return kvmppc_core_pending_dec(vcpu);
 213 }
 214
 215 static void kvmppc_decrementer_func(unsigned long data)
 216 {
 217         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 218
 219         kvmppc_core_queue_dec(vcpu);
 220
 221         if (waitqueue_active(&vcpu->wq)) {
 222                 wake_up_interruptible(&vcpu->wq);
 223                 vcpu->stat.halt_wakeup++;
 224         }
 225 }
 226
 227 /*
 228  * low level hrtimer wake routine. Because this runs in hardirq context
 229  * we schedule a tasklet to do the real work.
 230  */
 231 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 232 {
 233         struct kvm_vcpu *vcpu;
 234
 235         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 236         tasklet_schedule(&vcpu->arch.tasklet);
 237
 238         return HRTIMER_NORESTART;
 239 }
 240
 241 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 242 {
 243         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 244         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 245         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 246
 247         return 0;
 248 }
 249
 250 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 251 {
 252         kvmppc_mmu_destroy(vcpu);
 253 }
 254
 255 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 256 {
 257         kvmppc_core_vcpu_load(vcpu, cpu);
 258 }
 259
 260 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 261 {
 262         kvmppc_core_vcpu_put(vcpu);
 263 }
 264
 265 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 266                                         struct kvm_guest_debug *dbg)
 267 {
 268         return -EINVAL;
 269 }
 270
 271 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 272                                      struct kvm_run *run)
 273 {
 274         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 275 }
 276
 277 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 278                                       struct kvm_run *run)
 279 {
 280         ulong gpr;
 281
 282         if (run->mmio.len > sizeof(gpr)) {
 283                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 284                 return;
 285         }
 286
 287         if (vcpu->arch.mmio_is_bigendian) {
 288                 switch (run->mmio.len) {
 289                 case 4: gpr = *(u32 *)run->mmio.data; break;
 290                 case 2: gpr = *(u16 *)run->mmio.data; break;
 291                 case 1: gpr = *(u8 *)run->mmio.data; break;
 292                 }
 293         } else {
 294                 /* Convert BE data from userland back to LE. */
 295                 switch (run->mmio.len) {
 296                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 297                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 298                 case 1: gpr = *(u8 *)run->mmio.data; break;
 299                 }
 300         }
 301
 302         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 303 }
 304
 305 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 306                        unsigned int rt, unsigned int bytes, int is_bigendian)
 307 {
 308         if (bytes > sizeof(run->mmio.data)) {
 309                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 310                        run->mmio.len);
 311         }
 312
 313         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 314         run->mmio.len = bytes;
 315         run->mmio.is_write = 0;
 316
 317         vcpu->arch.io_gpr = rt;
 318         vcpu->arch.mmio_is_bigendian = is_bigendian;
 319         vcpu->mmio_needed = 1;
 320         vcpu->mmio_is_write = 0;
 321
 322         return EMULATE_DO_MMIO;
 323 }
 324
 325 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 326                         u32 val, unsigned int bytes, int is_bigendian)
 327 {
 328         void *data = run->mmio.data;
 329
 330         if (bytes > sizeof(run->mmio.data)) {
 331                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 332                        run->mmio.len);
 333         }
 334
 335         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 336         run->mmio.len = bytes;
 337         run->mmio.is_write = 1;
 338         vcpu->mmio_needed = 1;
 339         vcpu->mmio_is_write = 1;
 340
 341         /* Store the value at the lowest bytes in 'data'. */
 342         if (is_bigendian) {
 343                 switch (bytes) {
 344                 case 4: *(u32 *)data = val; break;
 345                 case 2: *(u16 *)data = val; break;
 346                 case 1: *(u8  *)data = val; break;
 347                 }
 348         } else {
 349                 /* Store LE value into 'data'. */
 350                 switch (bytes) {
 351                 case 4: st_le32(data, val); break;
 352                 case 2: st_le16(data, val); break;
 353                 case 1: *(u8 *)data = val; break;
 354                 }
 355         }
 356
 357         return EMULATE_DO_MMIO;
 358 }
 359
 360 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 361 {
 362         int r;
 363         sigset_t sigsaved;
 364
 365         vcpu_load(vcpu);
 366
 367         if (vcpu->sigset_active)
 368                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 369
 370         if (vcpu->mmio_needed) {
 371                 if (!vcpu->mmio_is_write)
 372                         kvmppc_complete_mmio_load(vcpu, run);
 373                 vcpu->mmio_needed = 0;
 374         } else if (vcpu->arch.dcr_needed) {
 375                 if (!vcpu->arch.dcr_is_write)
 376                         kvmppc_complete_dcr_load(vcpu, run);
 377                 vcpu->arch.dcr_needed = 0;
 378         }
 379
 380         kvmppc_core_deliver_interrupts(vcpu);
 381
 382         local_irq_disable();
 383         kvm_guest_enter();
 384         r = __kvmppc_vcpu_run(run, vcpu);
 385         kvm_guest_exit();
 386         local_irq_enable();
 387
 388         if (vcpu->sigset_active)
 389                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 390
 391         vcpu_put(vcpu);
 392
 393         return r;
 394 }
 395
 396 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 397 {
 398         kvmppc_core_queue_external(vcpu, irq);
 399
 400         if (waitqueue_active(&vcpu->wq)) {
 401                 wake_up_interruptible(&vcpu->wq);
 402                 vcpu->stat.halt_wakeup++;
 403         }
 404
 405         return 0;
 406 }
 407
 408 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 409                                     struct kvm_mp_state *mp_state)
 410 {
 411         return -EINVAL;
 412 }
 413
 414 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 415                                     struct kvm_mp_state *mp_state)
 416 {
 417         return -EINVAL;
 418 }
 419
 420 long kvm_arch_vcpu_ioctl(struct file *filp,
 421                          unsigned int ioctl, unsigned long arg)
 422 {
 423         struct kvm_vcpu *vcpu = filp->private_data;
 424         void __user *argp = (void __user *)arg;
 425         long r;
 426
 427         switch (ioctl) {
 428         case KVM_INTERRUPT: {
 429                 struct kvm_interrupt irq;
 430                 r = -EFAULT;
 431                 if (copy_from_user(&irq, argp, sizeof(irq)))
 432                         goto out;
 433                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 434                 break;
 435         }
 436         default:
 437                 r = -EINVAL;
 438         }
 439
 440 out:
 441         return r;
 442 }
 443
 444 long kvm_arch_vm_ioctl(struct file *filp,
 445                        unsigned int ioctl, unsigned long arg)
 446 {
 447         long r;
 448
 449         switch (ioctl) {
 450         default:
 451                 r = -ENOTTY;
 452         }
 453
 454         return r;
 455 }
 456
 457 int kvm_arch_init(void *opaque)
 458 {
 459         return 0;
 460 }
 461
 462 void kvm_arch_exit(void)
 463 {
 464 }