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