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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 <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         kfree(kvm);
 141 }
 142
 143 int kvm_dev_ioctl_check_extension(long ext)
 144 {
 145         int r;
 146
 147         switch (ext) {
 148         case KVM_CAP_PPC_SEGSTATE:
 149                 r = 1;
 150                 break;
 151         case KVM_CAP_COALESCED_MMIO:
 152                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 153                 break;
 154         default:
 155                 r = 0;
 156                 break;
 157         }
 158         return r;
 159
 160 }
 161
 162 long kvm_arch_dev_ioctl(struct file *filp,
 163                         unsigned int ioctl, unsigned long arg)
 164 {
 165         return -EINVAL;
 166 }
 167
 168 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 169                                    struct kvm_memory_slot *memslot,
 170                                    struct kvm_memory_slot old,
 171                                    struct kvm_userspace_memory_region *mem,
 172                                    int user_alloc)
 173 {
 174         return 0;
 175 }
 176
 177 void kvm_arch_commit_memory_region(struct kvm *kvm,
 178                struct kvm_userspace_memory_region *mem,
 179                struct kvm_memory_slot old,
 180                int user_alloc)
 181 {
 182        return;
 183 }
 184
 185
 186 void kvm_arch_flush_shadow(struct kvm *kvm)
 187 {
 188 }
 189
 190 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 191 {
 192         struct kvm_vcpu *vcpu;
 193         vcpu = kvmppc_core_vcpu_create(kvm, id);
 194         kvmppc_create_vcpu_debugfs(vcpu, id);
 195         return vcpu;
 196 }
 197
 198 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 199 {
 200         kvmppc_remove_vcpu_debugfs(vcpu);
 201         kvmppc_core_vcpu_free(vcpu);
 202 }
 203
 204 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 205 {
 206         kvm_arch_vcpu_free(vcpu);
 207 }
 208
 209 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 210 {
 211         return kvmppc_core_pending_dec(vcpu);
 212 }
 213
 214 static void kvmppc_decrementer_func(unsigned long data)
 215 {
 216         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 217
 218         kvmppc_core_queue_dec(vcpu);
 219
 220         if (waitqueue_active(&vcpu->wq)) {
 221                 wake_up_interruptible(&vcpu->wq);
 222                 vcpu->stat.halt_wakeup++;
 223         }
 224 }
 225
 226 /*
 227  * low level hrtimer wake routine. Because this runs in hardirq context
 228  * we schedule a tasklet to do the real work.
 229  */
 230 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 231 {
 232         struct kvm_vcpu *vcpu;
 233
 234         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 235         tasklet_schedule(&vcpu->arch.tasklet);
 236
 237         return HRTIMER_NORESTART;
 238 }
 239
 240 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 241 {
 242         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 243         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 244         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 245
 246         return 0;
 247 }
 248
 249 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 250 {
 251         kvmppc_mmu_destroy(vcpu);
 252 }
 253
 254 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 255 {
 256         kvmppc_core_vcpu_load(vcpu, cpu);
 257 }
 258
 259 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 260 {
 261         kvmppc_core_vcpu_put(vcpu);
 262 }
 263
 264 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 265                                         struct kvm_guest_debug *dbg)
 266 {
 267         return -EINVAL;
 268 }
 269
 270 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 271                                      struct kvm_run *run)
 272 {
 273         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 274         *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 = &vcpu->arch.gpr[vcpu->arch.io_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
 303 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 304                        unsigned int rt, unsigned int bytes, int is_bigendian)
 305 {
 306         if (bytes > sizeof(run->mmio.data)) {
 307                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 308                        run->mmio.len);
 309         }
 310
 311         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 312         run->mmio.len = bytes;
 313         run->mmio.is_write = 0;
 314
 315         vcpu->arch.io_gpr = rt;
 316         vcpu->arch.mmio_is_bigendian = is_bigendian;
 317         vcpu->mmio_needed = 1;
 318         vcpu->mmio_is_write = 0;
 319
 320         return EMULATE_DO_MMIO;
 321 }
 322
 323 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 324                         u32 val, unsigned int bytes, int is_bigendian)
 325 {
 326         void *data = run->mmio.data;
 327
 328         if (bytes > sizeof(run->mmio.data)) {
 329                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 330                        run->mmio.len);
 331         }
 332
 333         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 334         run->mmio.len = bytes;
 335         run->mmio.is_write = 1;
 336         vcpu->mmio_needed = 1;
 337         vcpu->mmio_is_write = 1;
 338
 339         /* Store the value at the lowest bytes in 'data'. */
 340         if (is_bigendian) {
 341                 switch (bytes) {
 342                 case 4: *(u32 *)data = val; break;
 343                 case 2: *(u16 *)data = val; break;
 344                 case 1: *(u8  *)data = val; break;
 345                 }
 346         } else {
 347                 /* Store LE value into 'data'. */
 348                 switch (bytes) {
 349                 case 4: st_le32(data, val); break;
 350                 case 2: st_le16(data, val); break;
 351                 case 1: *(u8 *)data = val; break;
 352                 }
 353         }
 354
 355         return EMULATE_DO_MMIO;
 356 }
 357
 358 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 359 {
 360         int r;
 361         sigset_t sigsaved;
 362
 363         vcpu_load(vcpu);
 364
 365         if (vcpu->sigset_active)
 366                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 367
 368         if (vcpu->mmio_needed) {
 369                 if (!vcpu->mmio_is_write)
 370                         kvmppc_complete_mmio_load(vcpu, run);
 371                 vcpu->mmio_needed = 0;
 372         } else if (vcpu->arch.dcr_needed) {
 373                 if (!vcpu->arch.dcr_is_write)
 374                         kvmppc_complete_dcr_load(vcpu, run);
 375                 vcpu->arch.dcr_needed = 0;
 376         }
 377
 378         kvmppc_core_deliver_interrupts(vcpu);
 379
 380         local_irq_disable();
 381         kvm_guest_enter();
 382         r = __kvmppc_vcpu_run(run, vcpu);
 383         kvm_guest_exit();
 384         local_irq_enable();
 385
 386         if (vcpu->sigset_active)
 387                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 388
 389         vcpu_put(vcpu);
 390
 391         return r;
 392 }
 393
 394 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 395 {
 396         kvmppc_core_queue_external(vcpu, irq);
 397
 398         if (waitqueue_active(&vcpu->wq)) {
 399                 wake_up_interruptible(&vcpu->wq);
 400                 vcpu->stat.halt_wakeup++;
 401         }
 402
 403         return 0;
 404 }
 405
 406 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 407                                     struct kvm_mp_state *mp_state)
 408 {
 409         return -EINVAL;
 410 }
 411
 412 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 413                                     struct kvm_mp_state *mp_state)
 414 {
 415         return -EINVAL;
 416 }
 417
 418 long kvm_arch_vcpu_ioctl(struct file *filp,
 419                          unsigned int ioctl, unsigned long arg)
 420 {
 421         struct kvm_vcpu *vcpu = filp->private_data;
 422         void __user *argp = (void __user *)arg;
 423         long r;
 424
 425         switch (ioctl) {
 426         case KVM_INTERRUPT: {
 427                 struct kvm_interrupt irq;
 428                 r = -EFAULT;
 429                 if (copy_from_user(&irq, argp, sizeof(irq)))
 430                         goto out;
 431                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 432                 break;
 433         }
 434         default:
 435                 r = -EINVAL;
 436         }
 437
 438 out:
 439         return r;
 440 }
 441
 442 long kvm_arch_vm_ioctl(struct file *filp,
 443                        unsigned int ioctl, unsigned long arg)
 444 {
 445         long r;
 446
 447         switch (ioctl) {
 448         default:
 449                 r = -ENOTTY;
 450         }
 451
 452         return r;
 453 }
 454
 455 int kvm_arch_init(void *opaque)
 456 {
 457         return 0;
 458 }
 459
 460 void kvm_arch_exit(void)
 461 {
 462 }